CN205174627U - Four control air conditioning system of double -cold -source - Google Patents
Four control air conditioning system of double -cold -source Download PDFInfo
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- CN205174627U CN205174627U CN201520875879.4U CN201520875879U CN205174627U CN 205174627 U CN205174627 U CN 205174627U CN 201520875879 U CN201520875879 U CN 201520875879U CN 205174627 U CN205174627 U CN 205174627U
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Abstract
The utility model discloses a four control air conditioning system of double -cold -source, including have the cold section of pyrometric scale terminal with the air conditioner of the cold section of low temperature table, provide the cold refrigeration source system who measures to the air conditioner end, refrigeration source system includes to be provided the cold high temperature cold source of measuring, provides the cold low temperature cold source of measuring to the cold section of low temperature table the cold section of pyrometric scale, link to each other with the high -temperature return water pipeline that has the high temperature water collector through the high temperature supply channel that has the high temperature water knockout drum respectively between the cold section of high temperature cold source and pyrometric scale, link to each other with the low temperature return water pipeline that has the low temperature water collector through the low temperature supply channel that has the low temperature water knockout drum respectively between low temperature cold source and the cold section of low temperature table. The utility model discloses guaranteeing under the unchangeable precondition of whole air -conditioning water chilling unit total capacity, bearing air conditioner load's proportion through the high low -temperature unit of rational distribution, furthest improves the load proportion who bears of high temperature unit, greatly reduced whole air conditioning system cooling load's energy consumption, be an energy -saving air conditioning system.
Description
Technical field
The utility model belongs to central central air conditioning design field, specifically a kind of two low-temperature receiver four-pipe system air conditioner coolant system of design.
Background technology
Central air conditioner system, according to the set-up mode of cold and hot pipeline, can be divided into two pipes system system and four-pipe system system.So-called two pipes system system refers to that Cooling and Heat Source utilizes same group to provide the system of air conditioner cold water or hot water for the return pipe coil pipe that is end equipment.So-called four-pipe system refers to Cooling and Heat Source respectively by respective for water return pipeline, for the cooling coil of end equipment and hot coil provide the system of air conditioner cold water and hot water to be called four-pipe system system respectively, has four transfer pipelines in system.
The feature of two pipes system system is: Cooling and Heat Source is used alternatingly (switching in season), simultaneously the cooling coil of terminad device and hot coil can not provide air conditioner cold water and hot water respectively, be applicable to that building functions is more single, comfortableness requires relatively low place.Invest relatively low.
If Fig. 1 is typical four-pipe system primary pump air-conditioning system, if Fig. 2 is typical four-pipe system two stage pump air-conditioning system, the feature of four-pipe system system is: Cooling and Heat Source can use simultaneously, hot and cold two groups of coil pipes can be configured in end equipment, supply air conditioner cold water and hot water to realize terminad device simultaneously, cooling and dehumidifying can be carried out to air---heat treatment again, meets the requirement of relative humidity.In addition, point in outskirt or room that cold and heat supply demand is different, by configuring the measures such as cold and hot coil pipe or single cooling coil, the hope of " taking what one needs " can be realized completely.Therefore, four-pipe system system is applicable to the occasion higher to room air parameter request, sometimes or even a kind of means of necessity.But output investment ratio is higher.
At present, no matter four-pipe system and or two pipes system air-conditioner water system, the supply water temperature that cold source of air conditioning is general is 7 DEG C, return water temperature 12 DEG C, supply backwater temperature difference 5 DEG C.(coefficient of performance of compression type chiller unit is defined as the ratio between handpiece Water Chilling Units refrigerating capacity and input power to the coefficient of performance value of cold source of air conditioning; The coefficient of performance of absorption chiller is defined as the ratio of the refrigerating capacity of acquisition and the heat of consumption.) generally only have 3.8 ~ 5.6.
Existing air-conditioning system, generally adopts the control method of humiture coupling.In summer, adopt dehumidification by condensation mode to realize cooling and the dehumidification treatments of air, remove sensible heat load and the latent heat load of building simultaneously.Generally, utilize the chilled water of 7 DEG C by dry-bulb temperature be 35.7 DEG C air (wet-bulb temperature 28.5 DEG C) process to dry-bulb temperature be 16.4 DEG C (relative humidity is 90%).7 DEG C of chilled water heat absorptions are elevated to 12 DEG C.Therefore, the evaporating temperature of cold source of air conditioning is generally designed to 4 DEG C, condensation temperature is generally 40 DEG C (considering that the supply and return water temperature of cooling water is 32/37 DEG C), according to inverse Carnot cycle, the desirable coefficient of performance of low-temperature receiver is 7.694, and changing the maximum COP value under operating mode, (coefficient of performance of compression type chiller unit is defined as the ratio between handpiece Water Chilling Units refrigerating capacity and input power to low-temperature receiver most effective at present; The coefficient of performance of absorption chiller is defined as the ratio of the refrigerating capacity of acquisition and the heat of consumption.) also can only reach 5.6, be 72.8% of ideal value.
The approach of current raising low-temperature receiver COP mainly from the compression efficiency by improving compressor, find suitable cold-producing medium, improve the aspects such as heat transfer boundary condition and improve, but along with the development of technology, the improvement of these aspects is more and more close to the bottleneck phase, simultaneously, improve the input cost that low-temperature receiver COP needs more and more higher, improve low-temperature receiver COP and seemed the end.
Find a kind of new method extremely urgent to the approach improving low-temperature receiver COP, as everyone knows, low-temperature receiver is under the constant condition of condensation temperature, and the leaving water temperature of low-temperature receiver is directly proportional to the COP value of low-temperature receiver.Therefore, under the prerequisite that air-conditioning system low-temperature receiver refrigerating capacity is constant, in order to improve the COP of low-temperature receiver and improve the leaving water temperature of low-temperature receiver.If the leaving water temperature of low-temperature receiver is once all improve, the dehumidifying effect of air-conditioning system will reduce greatly, this by sacrificing the measure that the next energy-conservation mode of comfort level is not a kind of the best.
Utility model content
The utility model looks for another way, from the supply water temperature of adjustment low-temperature receiver, provide a kind of comfort level neither reducing air-conditioning system, two low-temperature receiver four-pipe system air-conditioning systems of air-conditioning system low-temperature receiver energy consumption can be reduced again, this system is combined by high/low temperature low-temperature receiver and runs, while reducing energy consumption, improve the refrigeration performance of air-conditioning system.
A kind of two low-temperature receiver four-pipe system air-conditioning system, comprise with high temperature surface cooling section and low temperature surface cooling section air conditioning terminal, air conditioning terminal is provided to the cold source system of cold, described cold source system comprises:
High temperature surface cooling section is provided to the high temperature low-temperature receiver of cold, supply water temperature is 10-16 DEG C, and return water temperature is 15-21 DEG C, and supply backwater temperature difference is 5-11 DEG C;
Low temperature surface cooling section is provided to the low temperature cold source of cold, supply water temperature is 4-10 DEG C, and return water temperature is 9-15 DEG C, and supply backwater temperature difference is 5-11 DEG C;
Described high temperature low-temperature receiver is connected with the high-temperature tempering pipeline with high temperature water collector respectively by the high temperature supply channel with high temperature water knockout drum with between high temperature surface cooling section; Be connected with the low-temperature return water pipeline with low temperature water collector respectively by the low temperature supplying water lines with low temperature water knockout drum between described low temperature cold source with low temperature surface cooling section.
In the utility model, so-called " two low-temperature receiver ", refers to have in an air-conditioning system low-temperature receiver of two kinds of different evaporating temperatures.In two low-temperature receiver four-pipe system air-conditioning system, the relatively low low-temperature receiver of leaving water temperature is referred to as " low temperature cold source ", general 4 ~ 0 DEG C, its COP value generally only has 3.8 ~ 5.6, the low-temperature receiver that leaving water temperature is relatively high is referred to as " high temperature low-temperature receiver ", be generally 10 ~ 21 DEG C, its COP value can up to more than 8 ~ 9.In two low-temperature receiver four-pipe system air-conditioning system, high temperature low-temperature receiver and low temperature cold source shared air-conditioning system refrigeration duty, reduce energy consumption.
As preferably, the supply backwater temperature difference of described high temperature low-temperature receiver is 5-8 DEG C; The supply backwater temperature difference of described low temperature cold source is 5-8 DEG C; Further be preferably: the supply backwater temperature difference of described high temperature low-temperature receiver is 5-6 DEG C; The supply backwater temperature difference of described low temperature cold source is 5-6 DEG C.Adopt this technical scheme, be conducive to the cool-down dehumidification ability ensureing air-conditioning system.
As preferably, described low temperature cold source and high temperature low-temperature receiver are arranged in parallel, and are cooled by same or different cooling towers.Low temperature cold source and high temperature low-temperature receiver all can adopt the low-temperature receiver unit of multiple stage parallel connection.Each low-temperature receiver unit is all configured with independent by-pass valve control, can open and close separately.
As preferably, described high temperature low-temperature receiver supply water temperature is 13 ± 3 DEG C, and return water temperature is 18 ± 3 DEG C; Described low temperature supplying coolant-temperature gage is 7 ± 3 DEG C, and return water temperature is 12 ± 3 DEG C.As preferred further, described high temperature low-temperature receiver supply water temperature is 13 ± 1 DEG C, and return water temperature is 18 ± 1 DEG C; Described low temperature supplying coolant-temperature gage is 7 ± 1 DEG C, and return water temperature is 12 ± 1 DEG C.
As preferably, be provided with the first high temperature bypass pipe between described high temperature water knockout drum and high temperature water collector, this first high temperature bypass pipe is provided with first flow sensor; Described high temperature low-temperature receiver is controlled by described first flow sensor, when the flow signal that first flow sensor detects is greater than the flow of single unit in high temperature low-temperature receiver, closes a certain unit in high temperature low-temperature receiver;
Be provided with the first low temperature bypass pipe between described low temperature water knockout drum and low temperature water collector, this first low temperature bypass pipe is provided with second quantity sensor; Described low temperature cold source is controlled by described second quantity sensor, when the flow signal that second quantity sensor detects is greater than the flow of single unit in low temperature cold source, closes a certain unit in low temperature cold source.
When under equilibrium of supply and demand state, in the first high temperature bypass pipe between high temperature water knockout drum and high temperature water collector or the first low temperature bypass pipe between low temperature water knockout drum and low temperature water collector, flow is zero, when air conditioning terminal load change or control hysteresis time, have changes in flow rate in the first high temperature bypass pipe or the first low temperature bypass pipe.When flowing exceed the flow of the single unit in high temperature low-temperature receiver or low temperature cold source in the first high temperature bypass pipe or the first low temperature bypass pipe, illustrate that cold supply is far beyond demand, select to close a certain or a few units in this situation, directly save the energy consumption of low-temperature receiver.
When indoor humidity load is reduced to a certain degree, two low-temperature receiver four-pipe system air-conditioning system can start the independent cooling operating mode of high temperature low-temperature receiver, now closes low temperature cold source, compared with routine list low-temperature receiver two pipes system air-conditioning system, adopt the high temperature low-temperature receiver cooling that energy consumption is lower, the low-temperature receiver energy consumption of air-conditioning system reduces greatly.If high temperature low-temperature receiver adopts natural cooling source, now the low-temperature receiver energy consumption of two low-temperature receiver four-pipe system air-conditioning system is 0.Found by research, under room conditioning load is in running on the lower load for a long time, if now adopt the independent cooling of high temperature low-temperature receiver, so, the year power consumption of air-conditioning system low-temperature receiver will reduce greatly.
The utility model can adopt primary pump drive system, also two stage pump drive system can be adopted, when selecting two stage pump drive system, as preferably, described high-temperature tempering pipeline is provided with high temperature chilled water primary pump unit, and described high temperature supply channel is provided with high temperature chilled water two stage pump unit; Described low-temperature return water pipeline is provided with cryogenic freezing water primary pump unit, and described low temperature supplying water lines is provided with cryogenic freezing water two stage pump unit;
The first differential pressure pickup is provided with between described high temperature supply channel and high-temperature tempering pipeline; The second differential pressure pickup is provided with between described low temperature supplying water lines and low-temperature return water pipeline; First differential pressure pickup or the second differential pressure pickup for providing high temperature for the pressure differential information between, water return pipeline or low temperature supplying, water return pipeline, by the operation of this differential pressure information control pump unit;
Be provided with the second high temperature bypass pipe between described high temperature supply channel and high-temperature tempering pipeline, this second high temperature bypass pipe is in series with the first electric control valve and the first differential-pressure bypass valve; Be provided with the second low temperature bypass pipe between described low temperature supplying water lines and low-temperature return water pipeline, this second low temperature bypass pipe is in series with the second electric control valve and the second differential-pressure bypass valve;
Described high temperature chilled water two stage pump unit is the variable frequency pump unit being controlled by the first differential pressure pickup; Described cryogenic freezing water two stage pump unit is the variable frequency pump unit being controlled by the second differential pressure pickup; High and low temperature chilled water two stage pump unit, according to pressure extent, adjusts self rotating speed, thus adjust flux size; Such as, when high temperature increases for the pressure differential between, water return pipeline or low temperature supplying, water return pipeline, illustrate that end demand reduces, now need the rotating speed reducing high and low temperature chilled water two stage pump unit, otherwise, improve the rotating speed of described cryogenic freezing water two stage pump unit;
Described first electric control valve at described high temperature chilled water two stage pump unit list pump operation and this single pump works under low-limit frequency time open; Described second electric control valve at described cryogenic freezing water two stage pump unit list pump operation and this single pump works under low-limit frequency time open; When single pump works under low-limit frequency, change into from frequency conversion and determine frequency operation, the first electric control valve or the second electric control valve conducting, the second high temperature bypass pipe or the second low temperature bypass pipe conducting, the refrigerant of unnecessary refrigerant directly and after heat exchange is merged, returns high and low temperature low-temperature receiver;
Described first electric control valve, the second electric control valve directly can be controlled by the signal of telecommunication of high temperature chilled water two stage pump unit or the output of cryogenic freezing water two stage pump unit, also can be subject to the pressure difference signal of the first differential pressure pickup or the second differential pressure pickup, now need pressure difference signal to be converted to the control signal of telecommunication.
When selecting primary pump drive system, primary pump can adopt to be determined frequency pump and also can adopt variable frequency pump, and when selecting fixed pump frequently, described high-temperature tempering pipeline is provided with high temperature chilled water primary pump unit; Described low-temperature return water pipeline is provided with cryogenic freezing water primary pump unit; Described high temperature chilled water primary pump unit and cryogenic freezing water primary pump unit are fixed pump assembly frequently.Adopt one-level frequency pump assembly surely, stable chilled water can be provided to high/low temperature low-temperature receiver, ensure the optimum performance of high/low temperature low-temperature receiver.
As further preferably, described first high temperature bypass pipe is provided with the first differential-pressure bypass valve simultaneously; Described first low temperature bypass pipe is provided with the second differential-pressure bypass valve simultaneously.When on the first high temperature bypass pipe or the first low temperature bypass pipe, pressure reduction reaches requirement, the first differential-pressure bypass valve or the second differential-pressure bypass valve are opened, the first high temperature bypass pipe or the first low temperature bypass pipe conducting.
When selecting one-level variable frequency pump unit, described high-temperature tempering pipeline is provided with high temperature chilled water primary pump unit; Described low-temperature return water pipeline is provided with cryogenic freezing water primary pump unit;
The first differential pressure pickup is provided with between described high temperature supply channel and high-temperature tempering pipeline; The second differential pressure pickup is provided with between described low temperature supplying water lines and low-temperature return water pipeline; First differential pressure pickup or the second differential pressure pickup, for providing high temperature for the pressure differential information between, water return pipeline or low temperature supplying, water return pipeline, control the operation of one-level variable frequency pump unit by this differential pressure information;
Described high temperature chilled water primary pump unit is the variable frequency pump unit being controlled by the first differential pressure pickup; Described cryogenic freezing water primary pump unit is the variable frequency pump unit being controlled by the second differential pressure pickup.High and low temperature chilled water primary pump unit, according to pressure extent, adjusts self rotating speed, thus adjust flux size; Such as, when high temperature increases for the pressure differential between, water return pipeline or low temperature supplying, water return pipeline, illustrate that end demand reduces, now need the rotating speed reducing high and low temperature chilled water primary pump unit, otherwise, improve the rotating speed of described cryogenic freezing water primary pump unit.
As preferably, the utility model also comprises the temperature sensor and humidity sensor that detect outdoor temperature and humidity; Described high temperature low-temperature receiver and low temperature cold source are controlled by this temperature sensor and humidity sensor simultaneously.Optionally open high temperature low-temperature receiver, low temperature cold source according to outdoor temperature and humidity, or open high and low temperature low-temperature receiver simultaneously.As further preferably, according to outdoor temperature and end load amount, the cooling ratio of high/low temperature low-temperature receiver can be adjusted by control valve or pump assembly.
As preferably, the utility model also comprises the temperature sensor detected indoor temperature and the humidity sensor detected indoor humidity, and described high temperature low-temperature receiver and low temperature cold source are controlled by this temperature sensor and humidity sensor simultaneously.Can be controlled the load proportion that high temperature low-temperature receiver and low temperature cold source are born by return air temperature and air humidity, ensure heat pump performance optimization.
In two cold source air conditioning system, the air conditioner load ratio that high temperature low-temperature receiver is born is larger, and the energy consumption of whole air-conditioning system is less, but the ratio of high temperature low-temperature receiver is higher, and the dehumidifying effect of air-conditioning system is less.But, the ratio of air conditioner load is born merely for reducing the energy consumption of whole air-conditioning system and unconfined raising high temperature low-temperature receiver, when indoor humidity load is larger, two cold source air conditioning system can not meet indoor humidity load demand, and two low-temperature receiver four-pipe system air-conditioning system bears the ratio of air-conditioning system according to the suitable adjustment high temperature low-temperature receiver of indoor humidity load and low temperature.
In two cold source air conditioning system, air conditioning terminal control system adopts feedback control system, and tail end air conditioner system is distributed high temperature low-temperature receiver and low temperature cold source and born by measuring return air temperature and humidity the ratio that air-conditioning system bears.The control principle of two low-temperature receiver four-pipe system air-conditioning system is: preferentially all open high temperature low-temperature receiver cooling.If return air temperature and humidity are lower than setting value, now reduce the semen donors of high temperature low-temperature receiver gradually, until return air humiture reaches setting value; If return air temperature and humidity are higher than setting value, now open low temperature cold source cooling gradually, until return air humiture reaches setting value.The semen donors of high temperature low-temperature receiver and low temperature cold source controls by the flow of high temperature low-temperature receiver and low temperature cold source exit refrigerant.
In the utility model, " water " (such as confession/return water temperature, high/low temperature confession/water return pipeline, the high/low temperature chilled water one/two stage pump unit etc.) occurred in the title of each parameter, element, pipeline, the refrigerant of air-conditioning system is acted on without any restriction, in air-conditioning system of the present utility model, adoptable refrigerant both comprised water, also comprised the mixture of other refrigerating mediums and water or also can select other any media that can be used as refrigerating medium.
The two low-temperature receiver four-pipe system air-conditioning systems of the utility model indication and traditional four-pipe system air-conditioning system have essential distinction.First, supply and return water temperature is different, in tradition four-pipe system air-conditioning system, hot water supply and return water temperature supplies backwater water temperature higher than the high temperature chilled water in the utility model far away, in traditional air-conditioning system, hot water supply and return water temperature is generally 60 ~ 45 DEG C, return water temperature is 55 ~ 40 DEG C, and the supply water temperature of high temperature low-temperature receiver in the utility model is generally 13 ± 3 DEG C, return water temperature is generally 18 ± 3 DEG C.Secondly, purposes is different, in tradition four-pipe system air-conditioning system, chilled water is used for carrying out cool-down dehumidification to air, hot-water heating system is used for the reheating to air, the energy consumption of this system is comparatively large, and in two cold source air conditioning system, high/low temperature chilled water is all for the dehumidifying and cooling to air, without reheat load, the energy consumption of air-conditioning system is less.Finally, two low-temperature receiver four-pipe system air-conditioning systems not only can realize the cool-down dehumidification process of Air Coupling, can realize again the cool-down dehumidification process of air decoupling zero.
Compared with former air-conditioning system, the beneficial effects of the utility model are embodied in:
(1) the utility model breaks through traditional prejudice, adopt cold and hot pair of low-temperature receiver cooling, ensureing under the precondition that whole air conditioner cold water unit total capacity is constant, the ratio of air conditioner load is born by reasonable distribution high/low temperature unit, improve the load proportion born of high temperature unit to greatest extent, greatly reducing the energy consumption of whole air-conditioning system refrigeration duty, is a kind of energy-saving air-conditioning system.
(2) according to natural cooling source as high temperature low-temperature receiver cooling, the initial cost of whole air-conditioning system low-temperature receiver not only reduces greatly, and the energy consumption of air-conditioning system is also far smaller than the air conditioning energy consumption adopting compression type chiller unit or absorption chiller.
(3) transition season, when end humidity load declines, the adopted Efficient high-temperature low-temperature receiver cooling of whole air-conditioning system, greatly reduces air-conditioning system.
(4), in maintenance process, do not need to close air-conditioning system, adjustability is strong.
Accompanying drawing explanation
Fig. 1 is the structural representation of single low-temperature receiver four-pipe system primary pump air-conditioning system in prior art;
Fig. 2 is the structural representation of single low-temperature receiver four-pipe system two stage pump air-conditioning system in prior art;
Fig. 3 is the structural representation of of the present utility model pair of low-temperature receiver four-pipe system two stage pump air-conditioning system;
Fig. 4 is the structural representation of of the present utility model pair of low-temperature receiver four-pipe system primary pump air-conditioning system.
In above-mentioned accompanying drawing:
HSP-high temperature supply channel, CSP-low temperature supplying water lines, HRP-high-temperature tempering pipeline, CRP-low-temperature return water pipeline, HPI-high temperature chilled water primary pump unit, CPI-cryogenic freezing water primary pump unit, HPII-high temperature chilled water two stage pump unit, CPII-cryogenic freezing water two stage pump unit, HBPI-first high temperature bypass pipe, CBPI-first low temperature bypass pipe, F.M-I-first flow sensor, F.M-II-second quantity sensor, HBPII-second high temperature bypass pipe, CBPII-second low temperature bypass pipe, PSI-first differential pressure pickup, PSII-second differential pressure pickup, ECVI-first electric control valve, ECVII-second electric control valve, PBVI-first differential-pressure bypass valve, PBVII-second differential-pressure bypass valve, CWPI-first cooling water pump, CWPII-second cooling water pump, BVI-first control valve, BVII-second control valve.
Detailed description of the invention
Below in conjunction with accompanying drawing, the utility model is described further:
In the utility model, the low-temperature receiver of indication can be that natural cooling source is if the surface water such as rivers,lakes and seas, underground water etc. are directly as high/low temperature low-temperature receiver.Two low-temperature receiver four-pipe system air-conditioner water system in parallel is divided into low-temperature receiver four-pipe system Primary pumps air-conditioner water system in parallel and low-temperature receiver four-pipe system secondary pump in parallel air-conditioner water system.
Embodiment 1: two low-temperature receiver four-pipe system two stage pump in parallel air-conditioner water system
As shown in Figure 3, the cold source of air conditioning of two low-temperature receiver four-pipe system two stage pump in parallel air-conditioner water system is made up of jointly high temperature low-temperature receiver and low temperature cold source, adopts mode in parallel between high temperature low-temperature receiver and low temperature cold source; High temperature low-temperature receiver and low temperature cold source cool by cooling tower; The cooling water of cooling tower outlet provides cooling cold to high temperature low-temperature receiver and low temperature cold source respectively through the first cooling water pump CWPI, the second cooling water pump CWPII.
The supply water temperature of high temperature low-temperature receiver is 10-16 DEG C, and return water temperature is 15-21 DEG C, and supply backwater temperature difference is 5-11 DEG C; The supply water temperature of low temperature cold source is 4-10 DEG C, and return water temperature is 9-15 DEG C, and supply backwater temperature difference is 5-11 DEG C; High temperature low-temperature receiver and low temperature cold source can be made up of one or more low-temperature receiver unit as required, adopt the situation of multiple stage low-temperature receiver unit more common.
The induction system of air-conditioning system is divided into the induction system of high temperature chilled water and the induction system of cryogenic freezing water, and the induction system of high temperature chilled water and the induction system of cryogenic freezing water all adopt two stage pump to drive.The induction system of high temperature chilled water comprises high temperature supply channel HSP, be arranged on high temperature supply channel HSP with the high temperature water knockout drum of high temperature low-temperature receiver outlet, the high temperature chilled water two stage pump unit HPII that is communicated with high temperature water knockout drum primary outlet, high temperature chilled water two stage pump unit HPII outlet is communicated with the high temperature surface cooling section of each end respectively, high-temperature tempering pipeline HRP, be arranged on high temperature water collector, and the high temperature chilled water primary pump unit HPI of high temperature water collector outlet that high-temperature tempering pipeline HRP is communicated with each end outlet; Be provided with the first high temperature bypass pipe HBPI between high temperature water knockout drum and high temperature water collector bypass outlet, this first high temperature bypass pipe HBPI is provided with first flow sensor F.M-I, and the gateway pipeline of first flow sensor F.M-I is respectively equipped with stop valve; First flow sensor F.M-I is for detecting the flow of the first high temperature bypass pipe HBPI, when this flow is greater than the flow of separate unit low-temperature receiver unit in high temperature low-temperature receiver, transmit control signal to the first control valve BVI, system closing high temperature low-temperature receiver unit, until the flow that first flow sensor F.M-I detects is less than the flow of separate unit low-temperature receiver unit in high temperature low-temperature receiver; Be provided with the second high temperature bypass pipe HBPII between high temperature supply channel HSP and high-temperature tempering pipeline HRP and measure the first differential pressure pickup PSI of pressure reduction between two pipelines, the second high temperature bypass pipe HBPII is in series with the first electric control valve ECVI, the first differential-pressure bypass valve PBVI; First differential-pressure bypass valve PBVI opens when satisfied setting differential pressure requirements; High temperature chilled water two stage pump unit HPII is made up of multiple stage variable frequency pump, receive the pressure difference signal of the first differential pressure pickup PSI and then regulate himself rotating speed, such as, when the first differential pressure pickup PSI increases, then reduce pump rotary speed, otherwise then increase pump rotary speed, when only having a variable frequency pump in work, and this variable frequency pump is when being operated in low-limit frequency, the first electric control valve ECVI has opened; Second high temperature bypass pipe HBPII conducting when the first electric control valve ECVI, the first differential-pressure bypass valve PBVI all open, during one of them closedown of the first electric control valve ECVI and the first differential-pressure bypass valve PBVI, the second high temperature bypass pipe HBPII closes.
The induction system of cryogenic freezing water comprises low temperature supplying water lines CSP, be arranged on low temperature supplying water lines CSP with the low temperature water knockout drum of low temperature cold source outlet, the cryogenic freezing water two stage pump unit CPII that is communicated with low temperature water knockout drum primary outlet, cryogenic freezing water two stage pump unit CPII outlet is communicated with the low temperature surface cooling section of each end respectively, low-temperature return water pipeline CRP, be arranged on the low temperature water collector that low-temperature return water pipeline CRP is communicated with each end outlet, the cryogenic freezing water primary pump unit CPI be communicated with low temperature water collector primary outlet; Be provided with the first low temperature bypass pipe CBPI between low temperature water knockout drum and low temperature water collector bypass outlet, this first low temperature bypass pipe CBPI is provided with second quantity sensor F.M-II, and the gateway pipeline of second quantity sensor F.M-II is respectively equipped with stop valve; Second quantity sensor F.M-II is for detecting the flow of the first low temperature bypass pipe CBPI, when this flow is greater than the flow of single low-temperature receiver unit in low temperature cold source, transmit control signal to the second control valve BVII, system closing low temperature cold source unit, until the flow that second quantity sensor F.M-II detects is less than the flow of single low-temperature receiver unit in low temperature cold source; Be provided with the second low temperature bypass pipe CBPII between low temperature supplying water lines CSP and low-temperature return water pipeline CRP and measure the second differential pressure pickup PSII of pressure reduction between two pipelines, the second low temperature bypass pipe CBPII is in series with the second electric control valve ECVII, the second differential-pressure bypass valve PBVII; Second differential-pressure bypass valve PBVII opens when meeting and presetting differential pressure requirements; Cryogenic freezing water two stage pump unit CPII is made up of multiple stage variable frequency pump, cryogenic freezing water two stage pump unit CPII receives the pressure difference signal of the second differential pressure pickup PSII and then regulates himself rotating speed, when only having a variable frequency pump in work, and this variable frequency pump is when being operated in low-limit frequency, the second electric control valve ECVII has opened; Second low temperature bypass pipe CBPII conducting when the second electric control valve ECVII, the second differential-pressure bypass valve PBVII all open, during one of them closedown of the second electric control valve ECVII and the second differential-pressure bypass valve PBVII, the second low temperature bypass pipe CBPII closes.
The end of air-conditioning system adopts two low-temperature receiver air-treatment unit, and concrete structure can see patent document (application publication number CN102620360A).
During the technical scheme actual motion of the present embodiment:
During the normal cooling operating mode of system, when water system end flow (or end load) constantly reduces, pressure between high temperature feed pipe HSP (or low temperature supplying water pipe CSP) and high-temperature tempering pipe HRP (or low-temperature return water pipe CRP) raises, between high temperature feed pipe HSP (or low temperature supplying water pipe CSP) and high-temperature tempering pipe HRP (or low-temperature return water pipe CRP), the first differential pressure pickup PSI (or second differential pressure pickup PSII) detects pressure difference signal when changing, high temperature chilled water two stage pump unit HPII (or cryogenic freezing water two stage pump unit CPII) regulates flow and the pressure reduction of variable frequency pump for pressure difference signal between return pipe according to high temperature (or low temperature).When an only surplus variable frequency pump job in high temperature chilled water two stage pump unit HPII (or cryogenic freezing water two stage pump unit CPII), and variable frequency pump is converted to down in limited time, open the first electric control valve ECVI (or second electric control valve ECVII) between high temperature feed pipe HSP (or low temperature supplying water pipe CSP) and high-temperature tempering pipe HRP (or low-temperature return water pipe CRP), first differential-pressure bypass valve PBVI (or second differential-pressure bypass valve PBVII) opens under differential pressure action simultaneously, start pressure reduction bypass, and according to main frame inflow temperature and the Inlet and outlet water temperature difference, optimize main frame operating mode, guarantee the energy-efficient operation of main frame.
When water system end flow (or end load) constantly reduces, flow between high temperature water knockout drum (or low temperature water knockout drum) and high temperature water collector (or low temperature water collector) on the first high temperature bypass pipe HBPI (or first low temperature bypass pipe CBPI) increases gradually, when the upper first flow sensor F.M-I (or second quantity sensor F.M-II) of first high temperature bypass pipe HBPI (or first low temperature bypass pipe CBPI) detects that bypass flow is greater than separate unit high temperature (or low temperature cold source unit) low-temperature receiver unit flow, first flow sensor F.M-I (or second quantity sensor F.M-II) is arranged on the first control valve BVI (or second control valve BVII) shutdown signal that a high temperature low-temperature receiver unit (or low temperature cold source unit) exports, system closing high temperature low-temperature receiver unit (or low temperature cold source unit), and close corresponding high temperature chilled water primary pump unit HPI (or cryogenic freezing water primary pump unit CPI).Simultaneously to corresponding control and the feedback automation control of high temperature low-temperature receiver (or low temperature cold source) machine set outlet electric butterfly valve.
Embodiment 2: two low-temperature receiver four-pipe system primary pump in parallel air-conditioner water system
As shown in Figure 4, different from embodiment 1, in native system, only there is primary pump as fluidic drive source.High temperature chilled water two stage pump unit HPII and cryogenic freezing water two stage pump unit CPII cancels.High temperature chilled water primary pump unit HPI and cryogenic freezing water primary pump unit CPI can select simultaneously determines frequency pump or select variable frequency pump.
In the present embodiment, when high temperature chilled water primary pump unit HPI and cryogenic freezing water primary pump unit CPI is frequency conversion (Fig. 4 is the structural representation of this embodiment), the second high temperature bypass pipe HBPII between high temperature feed pipe HSP and high-temperature tempering pipe HRP cancels, and the first electric control valve ECVI wherein, the first differential-pressure bypass valve PBVI are directly connected on the first high temperature bypass pipe HBPI.
Meanwhile, the second low temperature bypass pipe CBPII between low temperature supplying water pipe CSP and low-temperature return water pipe CRP cancels, and the second electric control valve ECVII wherein, the second differential-pressure bypass valve PBVII are directly connected on the first low temperature bypass pipe CBPI.
First flow sensor F.M-I is connected directly between on high temperature feed pipe HSP, controls the first control valve BVI by flow signal; Second quantity sensor F.M-II is connected directly between on low temperature supplying water pipe CSP, controls the second control valve BVII by flow signal; Control principle is with embodiment 1.
Same, be provided with the first pressure sensor differential pressure pickup PSI between high temperature supply channel and high-temperature tempering pipeline, for controlling the first electric control valve ECVI; The second differential pressure pickup PSII is provided with, for controlling the second electric control valve ECVII between low temperature supplying water lines and low-temperature return water pipeline; Control principle is with embodiment 1.
When high temperature chilled water primary pump unit HPI and cryogenic freezing water primary pump unit CPI is variable frequency pump unit, high temperature chilled water primary pump unit HPI (or cryogenic freezing water primary pump unit CPI) controls by the first differential pressure pickup PSI (the second differential pressure pickup PSII) pressure difference signal, according to rotating speed and the pressure reduction of this pressure difference signal size adjustment self, when only having a variable frequency pump unit operation in high temperature chilled water primary pump unit HPI (or cryogenic freezing water primary pump unit CPI), and this variable frequency pump unit frequency-conversion is to low-limit frequency, now the first low temperature bypass pipe CBPI or the first high temperature bypass pipe HBPI ON operation.
In the present embodiment, when high temperature chilled water primary pump unit HPI and cryogenic freezing water primary pump unit CPI is for fixed pump assembly frequently, first flow sensor F.M-I and the second quantity sensor F.M-II course of work are with embodiment 1.Compared with frequency conversion primary pump structure, do not need to arrange the first pressure sensor differential pressure pickup PSI, the first electric control valve ECVI, the second differential pressure pickup PSII, the second electric control valve ECVII.When pressure reduction meets the demands, the first differential-pressure bypass valve PBVI or the second differential-pressure bypass valve PBVII starts, the first low temperature bypass pipe CBPI or the first high temperature bypass pipe HBPI ON operation.
For embodiment 1 and embodiment 2, for high temperature low-temperature receiver supply water temperature be 14 DEG C, high temperature low-temperature receiver return water temperature is 19 DEG C, low temperature cold source supply water temperature is 7 DEG C, low temperature cold source return water temperature is 12 DEG C and describes and adopt two stage pump units and only adopt the cooling operating mode of primary pump unit as follows:
For the air-conditioning system adopting two stage pump unit, wherein the work of two stage pump unit is as follows:
High temperature low-temperature receiver produces the high temperature chilled water of 14 DEG C after the shunting of high temperature water knockout drum, the end pyrometric scale cooler of air-conditioning system is delivered to by high temperature chilled water two stage pump unit HPII, the high temperature chilled water backwater of 19 DEG C is become after high temperature water collector is collected after two low-temperature receiver special air conditioner end unit (air conditioning terminal unit refers to the air-treatment unit of the air-conditioning system such as unitary air handling unit, Fresh air handling units, fan coil, cabinet type or vertical air conditioner unit) crosses heat exchange, by the unified evaporimeter delivering to high cold source of high temperature chilled water primary pump unit HPI, so circulate; Low temperature cold source produces the cryogenic freezing water of 7 DEG C after the shunting of low temperature water knockout drum, the end cryometer cooler of air-conditioning system is delivered to by cryogenic freezing water two stage pump unit CPII, the cryogenic freezing water backwater of 12 DEG C is become after low temperature water collector is collected after two low-temperature receiver special air conditioner end unit crosses heat exchange, by the unified evaporimeter delivering to low cold source of cryogenic freezing water primary pump unit CPI, so circulate.
For the air-conditioning system adopting primary pump unit, wherein the work of primary pump unit is as follows:
High temperature low-temperature receiver produces the high temperature chilled water of 14 DEG C after the shunting of high temperature water knockout drum, the end pyrometric scale cooler of air-conditioning system is delivered to by high temperature chilled water primary pump unit HPI, the high temperature chilled water backwater of 19 DEG C is become after high temperature water collector is collected after two low-temperature receiver special air conditioner end unit (air conditioning terminal unit refers to the air-treatment unit of the air-conditioning system such as unitary air handling unit, Fresh air handling units, fan coil, cabinet type or vertical air conditioner unit) crosses heat exchange, by the unified evaporimeter delivering to high cold source of high temperature chilled water primary pump unit HPI, so circulate; Low temperature cold source produces the cryogenic freezing water of 7 DEG C after the shunting of low temperature water knockout drum, the end cryometer cooler of air-conditioning system is delivered to by cryogenic freezing water primary pump unit CPI, the cryogenic freezing water backwater of 12 DEG C is become after low temperature water collector is collected after two low-temperature receiver special air conditioner end unit crosses heat exchange, by the unified evaporimeter delivering to low cold source of cryogenic freezing water primary pump unit CPI, so circulate.
In technique scheme, can according to outdoor temperature, select to need to open high temperature low-temperature receiver or need to open low temperature cold source, such as, when outdoor temperature is higher than 35 DEG C, weather is comparatively hot, for obtaining good refrigeration, only can open low temperature cold source; When outdoor temperature is lower than 35 DEG C, during higher than 30 DEG C, low temperature cold source and high temperature low-temperature receiver can be opened simultaneously; When outdoor temperature is lower than 30 DEG C, only needs to open high temperature low-temperature receiver, adopt above-mentioned operational mode to reduce the energy consumption of air-conditioning system further.
Transition season high temperature unit cooling operating mode:
In conditioning transition air season, because the refrigeration duty of air-conditioning system reduces greatly, now whole air-conditioning system switch to high temperature unit cooling operating mode, the leaving water temperature of high temperature unit is identical with the leaving water temperature of high temperature unit in high/low temperature unit simultaneously cooling operating mode.
In addition, if high temperature unit breaks down, now whole air-conditioning system switch to low temperature unit cooling operating mode, the water pump of high temperature unit, high temperature chilled water conveying system and pyrometric scale cooler corresponding to two low-temperature receiver four-pipe system air-conditioning system end unit quit work, and low temperature unit is according to the demand cooling of end unit.If low temperature unit breaks down, now whole air-conditioning system switch to high temperature unit cooling operating mode, the water pump of low temperature unit, cryogenic freezing water conveying system and cryometer cooler corresponding to two low-temperature receiver four-pipe system air-conditioning system end unit quit work, high temperature unit is according to the demand cooling of end unit, and now the leaving water temperature of high temperature unit is identical with low temperature unit.
With the refrigeration duty data instance of air-conditioned room in certain Practical Project, the fractional energy savings of the air-conditioning system of the two low-temperature receiver four-pipe system of checking further.
Out door climatic parameter is: the outdoor dry-bulb temperature 35.6 DEG C of summer air-conditioning, the outdoor wet-bulb temperature 27.9 DEG C of summer air-conditioning.Indoor design is: Summer Indoor design temperature 26 DEG C, relative humidity 55%, dew-point air supply state point temperature 16.5 DEG C, relative humidity; COP when low temperature cold source supply and return water temperature is 7/12 DEG C gets 5.6, and high temperature low-temperature receiver supply water temperature and cooled air minimum temperature difference Δ t get 3 DEG C; Total air output of air-conditioned room is minimum supply air rate, air output when namely ventilation state point is dew-point air supply state point.Refer to table 1;
The low-temperature receiver comprehensive energy efficiency of table 1 pair low-temperature receiver four-pipe system air-conditioning system compares EER
Can be drawn by table 1: under the condition of given new wind ratio, the low-temperature receiver Energy Efficiency Ratio (the low-temperature receiver Energy Efficiency Ratio of the air-conditioning system that conventional single low-temperature receiver humiture is coupled only has 5.6) compared with the air-conditioning system low-temperature receiver Energy Efficiency Ratio of the warm and humid coupling of single low-temperature receiver of the air-conditioning system of two low-temperature receiver four-pipe system, the maximum Energy Efficiency Ratio of two low-temperature receiver four-pipe system air-conditioning system can reach 7.48, can about 30% be improved, that is to say that the energy consumption of air-conditioning system low-temperature receiver can reduce about 30%.
Compared with former air-conditioning system: (1) the utility model is ensureing under the precondition that whole air conditioner cold water unit total capacity is constant, the ratio of air conditioner load is born by reasonable distribution high/low temperature unit, improve the load proportion born of high temperature unit to greatest extent, greatly reducing the energy consumption of whole air-conditioning system refrigeration duty, is a kind of energy-saving air-conditioning system.(2) according to natural cooling source as high temperature low-temperature receiver cooling, the initial cost of whole air-conditioning system low-temperature receiver not only reduces greatly, and the energy consumption of air-conditioning system is also far smaller than the air conditioning energy consumption adopting compression type chiller unit or absorption chiller.(3) transition season, when end humidity load declines, the adopted Efficient high-temperature low-temperature receiver cooling of whole air-conditioning system, greatly reduces air-conditioning system.
Claims (10)
1. a two low-temperature receiver four-pipe system air-conditioning system, comprise with high temperature surface cooling section and low temperature surface cooling section air conditioning terminal, air conditioning terminal is provided to the cold source system of cold, it is characterized in that, described cold source system comprises:
High temperature surface cooling section is provided to the high temperature low-temperature receiver of cold, supply water temperature is 10-16 DEG C, and return water temperature is 15-21 DEG C, and supply backwater temperature difference is 5-11 DEG C;
Low temperature surface cooling section is provided to the low temperature cold source of cold, supply water temperature is 4-10 DEG C, and return water temperature is 9-15 DEG C, and supply backwater temperature difference is 5-11 DEG C;
Described high temperature low-temperature receiver is connected with the high-temperature tempering pipeline with high temperature water collector respectively by the high temperature supply channel with high temperature water knockout drum with between high temperature surface cooling section; Be connected with the low-temperature return water pipeline with low temperature water collector respectively by the low temperature supplying water lines with low temperature water knockout drum between described low temperature cold source with low temperature surface cooling section.
2. according to claim 1 pair of low-temperature receiver four-pipe system air-conditioning system, is characterized in that, the supply backwater temperature difference of described high temperature low-temperature receiver is 5-8 DEG C; The supply backwater temperature difference of described low temperature cold source is 5-8 DEG C.
3. according to claim 1 pair of low-temperature receiver four-pipe system air-conditioning system, is characterized in that, described low temperature cold source and high temperature low-temperature receiver are arranged in parallel, and are cooled by cooling tower.
4. according to claim 1 pair of low-temperature receiver four-pipe system air-conditioning system, is characterized in that, described high temperature low-temperature receiver supply water temperature is 13 ± 1 DEG C, and return water temperature is 18 ± 1 DEG C; Described low temperature supplying coolant-temperature gage is 7 ± 1 DEG C, and return water temperature is 12 ± 1 DEG C.
5. the two low-temperature receiver four-pipe system air-conditioning systems according to the arbitrary claim of claim 1-4, is characterized in that:
Be provided with the first high temperature bypass pipe between described high temperature water knockout drum and high temperature water collector, this first high temperature bypass pipe is provided with first flow sensor; Described high temperature low-temperature receiver is controlled by described first flow sensor, when the flow signal that first flow sensor detects is greater than the flow of single unit in high temperature low-temperature receiver, closes a certain unit in high temperature low-temperature receiver;
Be provided with the first low temperature bypass pipe between described low temperature water knockout drum and low temperature water collector, this first low temperature bypass pipe is provided with second quantity sensor; Described low temperature cold source is controlled by described second quantity sensor, when the flow signal that second quantity sensor detects is greater than the flow of single unit in low temperature cold source, closes a certain unit in low temperature cold source.
6. the two low-temperature receiver four-pipe system air-conditioning systems according to claim 5 claim, is characterized in that:
Described high-temperature tempering pipeline is provided with high temperature chilled water primary pump unit, and described high temperature supply channel is provided with high temperature chilled water two stage pump unit; Described low-temperature return water pipeline is provided with cryogenic freezing water primary pump unit, and described low temperature supplying water lines is provided with cryogenic freezing water two stage pump unit;
Described high temperature supply channel and high temperature return between cold water pipeline and are provided with the first differential pressure pickup; The second differential pressure pickup is provided with between described low temperature supplying water lines and low-temperature return water pipeline;
Be provided with the second high temperature bypass pipe between described high temperature supply channel and high-temperature tempering pipeline, this second high temperature bypass pipe is in series with the first electric control valve and the first differential-pressure bypass valve; Be provided with the second low temperature bypass pipe between described low temperature supplying water lines and low-temperature return water pipeline, this second low temperature bypass pipe is in series with the second electric control valve and the second differential-pressure bypass valve;
Described high temperature chilled water two stage pump unit is the variable frequency pump unit being controlled by the first differential pressure pickup; Described cryogenic freezing water two stage pump unit is the variable frequency pump unit being controlled by the second differential pressure pickup;
Described first electric control valve at described high temperature chilled water two stage pump unit list pump operation and this single pump works under low-limit frequency time open; Described second electric control valve at described cryogenic freezing water two stage pump unit list pump operation and this single pump works under low-limit frequency time open.
7. according to claim 5 pair of low-temperature receiver four-pipe system air-conditioning system, is characterized in that: described high-temperature tempering pipeline is provided with high temperature chilled water primary pump unit; Described low-temperature return water pipeline is provided with cryogenic freezing water primary pump unit; Described high temperature chilled water primary pump unit and cryogenic freezing water primary pump unit are fixed pump assembly frequently; Described first high temperature bypass pipe is provided with the first differential-pressure bypass valve simultaneously; Described first low temperature bypass pipe is provided with the second differential-pressure bypass valve simultaneously.
8. according to claim 5 pair of low-temperature receiver four-pipe system air-conditioning system, is characterized in that:
Described high-temperature tempering pipeline is provided with high temperature chilled water primary pump unit; Described low-temperature return water pipeline is provided with cryogenic freezing water primary pump unit;
The first pressure sensor differential pressure pickup is provided with between described high temperature supply channel and high-temperature tempering pipeline; The second differential pressure pickup is provided with between described low temperature supplying water lines and low-temperature return water pipeline;
Described high temperature chilled water primary pump unit is the variable frequency pump unit being controlled by the first differential pressure pickup; Described cryogenic freezing water primary pump unit is the variable frequency pump unit being controlled by the second differential pressure pickup.
9. according to claim 5 pair of low-temperature receiver four-pipe system air-conditioning system, is characterized in that: also comprise the temperature sensor and humidity sensor that detect indoor and outdoor temperature and humidity; Described high temperature low-temperature receiver and low temperature cold source are controlled by this temperature sensor and humidity sensor simultaneously.
10. according to claim 5 pair of low-temperature receiver four-pipe system air-conditioning system, it is characterized in that: also comprise the temperature sensor detected indoor temperature and the humidity sensor detected indoor humidity, described high temperature low-temperature receiver and low temperature cold source are controlled by this temperature sensor and humidity sensor simultaneously.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520875879.4U CN205174627U (en) | 2015-11-04 | 2015-11-04 | Four control air conditioning system of double -cold -source |
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| CN201520875879.4U CN205174627U (en) | 2015-11-04 | 2015-11-04 | Four control air conditioning system of double -cold -source |
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| CN201520875879.4U Withdrawn - After Issue CN205174627U (en) | 2015-11-04 | 2015-11-04 | Four control air conditioning system of double -cold -source |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105222241A (en) * | 2015-11-04 | 2016-01-06 | 杭州绿程节能科技有限公司 | Two low-temperature receiver four-pipe system air-conditioning system |
| CN109442802A (en) * | 2018-11-29 | 2019-03-08 | 宁波杭州湾新区祥源动力供应有限公司 | A kind of economic benefits and social benefits water cooler cold-hot combined supply system |
-
2015
- 2015-11-04 CN CN201520875879.4U patent/CN205174627U/en not_active Withdrawn - After Issue
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105222241A (en) * | 2015-11-04 | 2016-01-06 | 杭州绿程节能科技有限公司 | Two low-temperature receiver four-pipe system air-conditioning system |
| CN105222241B (en) * | 2015-11-04 | 2018-03-27 | 杭州绿程节能科技有限公司 | Double low-temperature receiver four-pipe system air-conditioning systems |
| CN109442802A (en) * | 2018-11-29 | 2019-03-08 | 宁波杭州湾新区祥源动力供应有限公司 | A kind of economic benefits and social benefits water cooler cold-hot combined supply system |
| CN109442802B (en) * | 2018-11-29 | 2024-04-09 | 宁波杭州湾新区祥源动力供应有限公司 | Double-effect cold water unit cold and heat combined supply system |
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