CN104456846A - Control method for dual-system air conditioning unit - Google Patents
Control method for dual-system air conditioning unit Download PDFInfo
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- CN104456846A CN104456846A CN201410674604.4A CN201410674604A CN104456846A CN 104456846 A CN104456846 A CN 104456846A CN 201410674604 A CN201410674604 A CN 201410674604A CN 104456846 A CN104456846 A CN 104456846A
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- 238000004378 air conditioning Methods 0.000 title claims abstract description 92
- 238000000034 method Methods 0.000 title claims abstract description 69
- 230000008569 process Effects 0.000 claims abstract description 30
- 230000035939 shock Effects 0.000 claims abstract description 21
- 238000005057 refrigeration Methods 0.000 claims abstract description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 33
- 238000011084 recovery Methods 0.000 claims description 14
- 230000008859 change Effects 0.000 claims description 12
- 238000010438 heat treatment Methods 0.000 abstract description 20
- 239000007788 liquid Substances 0.000 abstract description 15
- 238000006243 chemical reaction Methods 0.000 abstract 1
- 230000009977 dual effect Effects 0.000 description 5
- 239000003507 refrigerant Substances 0.000 description 4
- 238000001816 cooling Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 239000008236 heating water Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
- 238000010977 unit operation Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/65—Electronic processing for selecting an operating mode
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2140/00—Control inputs relating to system states
- F24F2140/20—Heat-exchange fluid temperature
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2221/00—Details or features not otherwise provided for
- F24F2221/54—Heating and cooling, simultaneously or alternatively
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Atmospheric Sciences (AREA)
- Physics & Mathematics (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Signal Processing (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention provides a control method for a dual-system air conditioning unit, which comprises a starting process S100, wherein the starting process S100 is that after a first system and a second system finish heating work mode conversion, the first system and the second system are started. Because the first system and the second system are switched into the heating working mode and then started, when the first system and the second system are started, the two systems are all in the heating working mode, the problem that the two systems are influenced by each other due to heating of one system and refrigeration of the other system is effectively avoided, and the problem that the system is abnormally stopped due to thermal shock is solved. Meanwhile, the liquid impact hidden danger which possibly occurs in the first four-way valve and/or the second four-way valve is eliminated, and the operation reliability and the working stability of the dual-system air conditioning unit are improved.
Description
Technical field
The present invention relates to technical field of heat exchange equipment, in particular to a kind of control method for dual-system air conditioning group.
Background technology
Part recuperation of heat dual-system air conditioning group in the winter time time, need the function with air-conditioning heating and domestic hot-water's function.Control method at present for dual-system air conditioning group is mainly divided into two kinds:
One, adopt dual system with opening with stopping, compressor and cross valve are started by sequence.Because dual system is excessive with transient voltage, the electric current opened with stopping, can impacts electrical network, thus affecting the life-span of dual-system air conditioning group, being unfavorable for the Electrical Safety of user.
Two, adopt dual system start and stop respectively in order, compressor and cross valve are started by sequence.But operationally still there are the following problems for this kind of control method:
Startup stage: the pressured difference of cross valve commutates, and heating operation system is also first running refrigerating, and then cross valve commutation, switches to and heat mode of operation.Supposing that the first system is first opened, enter the state of heating, is refrigerating state when second system is just opened, and such second system will have an impact to the first system.Now, the first system mainly improves water temperature, and second system is in reduction water temperature; the evaporator temperature of the first system is dragged down; corresponding evaporating pressure also reduces, and now the low-voltage variation of dual-system air conditioning group routine detects abnormal conditions, the compressor of meeting positive closing correspondence system.Therefore, dual-system air conditioning group system can be caused frequently to occur, and subnormal pressure is protected, and causes dual-system air conditioning group frequently to add unloading and shuts down.Meanwhile, when heat recovery function also can make cross valve commutate to heating generation thermal shock, liquid hammer causes cross valve to damage.
Operation phase: along with the change of thermic load occurs that system adds the situation of unloading in dual-system air conditioning group running, there will be again the situation starting thermal shock.
Shut-down-phase: when dual-system air conditioning group terminates to shut down, heat recovery function and compressor stop simultaneously.But because water is as refrigerating medium, compressor stops, and system still has the process of heat exchange.Now there is liquid refrigerant in cross valve, and commutation there will be liquid hit phenomenon, causes cross valve to damage.
In sum, in use there are the following problems for dual-system air conditioning group of the prior art:
1, under winter heating and domestic hot-water's function, part heat recovery function produces thermal shock to heat-production functions, and unit cannot normally run;
2, dual system starts, terminates all to exist when shutting down the hidden danger of high frequent start and stop, cross valve liquid hazards;
3, in dual system operation there is adverse effect to system in the change of extraneous thermic load.
Summary of the invention
Main purpose of the present invention is to provide a kind of control method for dual-system air conditioning group, to solve the problem of easy cancel closedown when dual-system air conditioning group in prior art starts.
To achieve these goals, the invention provides a kind of control method for dual-system air conditioning group, comprise start process S100, start process S100, after the first system and second system all complete and heat working mode change, restarts the first system and second system.
Further, the method heating working mode change is the first cross valve 10 of the first system and the second cross valve 20 of second system be converted to by initial refrigeration work pattern connected state to heat mode of operation connected state.
Further, start process S100 comprises: step S110: the first compressor 11 of the first system starts, and the first cross valve 10 commutates to heating mode of operation; Step S120: the first compressor 11 is shut down; Step S130: the second compressor 21 of second system starts, and the second cross valve 20 commutates to heating mode of operation; Step S140: the second compressor 21 is shut down; Step S150: the first compressor 11 and the second compressor 21 start.
Further, step S110 comprises: the step S111: the first compressor 11 starts; Step S112: time delay waited for for first scheduled time; Step S113: the first cross valve 10 switch operation.
Further, step S130 comprises: the step S131: the second compressor 21 starts; Step S132: time delay waited for for second scheduled time; Step S133: the second cross valve 20 switch operation.
Further, step S150 comprises: the step S151: the first compressor 11 starts; Step S152: time delay waited for for the 3rd scheduled time; Step S153: the second compressor 21 starts.
Further, control method also comprises running S200, and running S200 is the duty of environmentally thermic load situation determination the first system and second system.
Further, running S200 comprises: step S210: the actual inflow temperature detecting dual-system air conditioning group, to determine the duty of the first system and second system, step S210 is repeated when the duty of the first system and second system is all constant, only continue step S220 when the second compressor 21 of second system is shut down and needs to restart the second compressor 21, step S230 is continued when the first compressor 11 of the first system and the second compressor 21 are all shut down, only keep the duty of the first system constant when the second compressor 21 is shut down and without the need to restarting the second compressor 21 and repeat step S210, step S220: judge whether restart the second compressor 21 causes thermal shock to the first system, and determine directly to restart the second compressor 21 or repeat start process S100 again after being shut down by the first compressor 11, step S230: repeat start process S100.
Further, step S210 comprises: step S211: the actual inflow temperature detecting dual-system air conditioning group, the actual inflow temperature of dual-system air conditioning group and target water temperature are compared, when the actual inflow temperature of dual-system air conditioning group is more than or equal to target water temperature, the second compressor 21 is shut down, and continue step S212, otherwise, keep the duty of the first system and second system constant, and repeat step S211; Step S212: continue the actual inflow temperature detecting dual-system air conditioning group; the actual inflow temperature of dual-system air conditioning group and target water temperature are compared; when the actual inflow temperature of dual-system air conditioning group is still greater than target water temperature, the first compressor 11 is shut down and continued step S230; keep the duty of the first system constant when the actual inflow temperature of dual-system air conditioning group equals target water temperature and repeat step S212, continuing step S220 when the actual inflow temperature of dual-system air conditioning group is less than target water temperature.
Further, step S220 comprises: step S221: the actual exhaust air temperature detecting the first compressor 11, by actual exhaust air temperature compared with target exhaust temperature, when actual exhaust air temperature is greater than target exhaust temperature, second system can not cause thermal shock to the first system and continue step S222, otherwise continues step S223; Step S222: the second compressor 21 is opened, and repeats step S210 to step S230; Step S223: second system can cause thermal shock to the first system when actual exhaust air temperature is less than target exhaust temperature, repeats start process S100 after being shut down by the first compressor 11 again.
Further, control method also comprises shutdown process S300, and shutdown process S300 is the heat recovery function first stopping the first system and second system before the first compressor 11 and the second compressor 21 are shut down.
Further, shutdown process S300 comprises: step S310: closed by the heat recovery function of the first system and second system; Step S320: time delay the 4th scheduled time; Step S330: the first compressor 11 and the second compressor 21 are shut down; Step S340: time delay the 5th scheduled time; Step S350: the first cross valve 10 and the commutation of the second cross valve 20 are reset to refrigeration work pattern.
Further, by closing the recuperation of heat water pump of the first system and second system to be closed by heat recovery function.
Apply technical scheme of the present invention, after the first system and second system all complete and heat working mode change, restart the first system and second system, to solve the problem of easy cancel closedown when dual-system air conditioning group starts.Due to the first system and second system are first converted to heat mode of operation after restart; thus after the first system and second system start; two systems all enter and heat mode of operation; effectively prevent that a system heats, a cooling system and cause the two interactional problem, solve thermal shock and may to lead to system abnormity the problem of shutting down.Meanwhile, eliminate the liquid hammer hidden danger that the first cross valve and/or the second cross valve may occur, improve operational reliability and the job stability of dual-system air conditioning group.
Accompanying drawing explanation
The Figure of description forming a application's part is used to provide a further understanding of the present invention, and schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 shows the structural representation of the dual-system air conditioning group in the present invention;
Fig. 2 shows the flow chart of the start process in the control method in the present invention;
Fig. 3 shows the flow chart of the running in the control method in the present invention; And
Fig. 4 shows the flow chart of the shutdown process in the control method in the present invention.
Wherein, above-mentioned accompanying drawing comprises the following drawings mark:
10, the first cross valve; 11, the first compressor; 12, heat recovering heat exchanger; 13, the first vapour liquid separator; 14, the first electric expansion valve; 20, the second cross valve; 21, the second compressor; 23, the second vapour liquid separator; 24, the second electric expansion valve; 30, heat source side heat exchanger; 40, side heat exchanger is used; 50, the first pipeline; 51, the second pipeline; 52, the 3rd pipeline; 53, the 4th pipeline; 54, the 5th pipeline; 55, the 6th pipeline; 56, the 7th pipeline; 57, the 8th pipeline; 58, the 9th pipeline.
Detailed description of the invention
It should be noted that, when not conflicting, the embodiment in the application and the feature in embodiment can combine mutually.Below with reference to the accompanying drawings and describe the present invention in detail in conjunction with the embodiments.
As first aspect of the present invention, provide a kind of dual-system air conditioning group.As shown in Figure 1, dual-system air conditioning group comprises the first cross valve 10, first compressor 11, heat recovering heat exchanger 12, first vapour liquid separator 13, first electric expansion valve 14, second cross valve 20, second compressor 21, second vapour liquid separator 23, second electric expansion valve 24, heat source side heat exchanger 30, uses side heat exchanger 40, first pipeline 50, second pipeline 51, the 3rd pipeline 52, the 4th pipeline 53, the 5th pipeline 54, the 6th pipeline 55, the 7th pipeline 56, the 8th pipeline 57 and the 9th pipeline 58, wherein, the relation of above-mentioned each parts as shown in Figure 1.
When dual-system air conditioning group is in refrigeration work pattern, only for the first system, the flow path of refrigerant is the first pipeline 50, second pipeline 51, the 3rd pipeline 52, the 4th pipeline 53, the 5th pipeline 54, the 6th pipeline 55, the 7th pipeline 56, the 8th pipeline 57, the 9th pipeline 58 are back to the first pipeline 50.
When dual-system air conditioning group be in heat mode of operation time, only for the first system, the flow path of refrigerant is the first pipeline 50, second pipeline 51, the 6th pipeline 55, the 5th pipeline 54, the 4th pipeline 53, the 3rd pipeline 52, the 7th pipeline 56, the 8th pipeline 57, the 9th pipeline 58 are back to the first pipeline 50.
As second aspect of the present invention, provide a kind of control method for dual-system air conditioning group.As shown in Figures 2 to 4, control method comprises start process S100, and start process S100, after the first system and second system all complete and heat working mode change, restarts the first system and second system.Preferably, the method heating working mode change is the first cross valve 10 of the first system and the second cross valve 20 of second system be converted to by initial refrigeration work pattern connected state to heat mode of operation connected state.。Due to the first system and second system are first converted to heat mode of operation after restart; thus after the first system and second system start; two systems all enter and heat mode of operation; effectively prevent that a system heats, a cooling system and cause the two interactional problem, solve thermal shock and may to lead to system abnormity the problem of shutting down.Meanwhile, eliminate the liquid hammer hidden danger that the first cross valve 10 and/or the second cross valve 20 may occur, improve operational reliability and the job stability of dual-system air conditioning group.
As shown in Figure 2, start process S100 comprises: step S110: the first compressor 11 of the first system starts, and the first cross valve 10 commutates to heating mode of operation; Step S120: the first compressor 11 is shut down; Step S130: the second compressor 21 of second system starts, and the second cross valve 20 commutates to heating mode of operation; Step S140: the second compressor 21 is shut down; Step S150: the first compressor 11 and the second compressor 21 start.Owing to completing the switch operation of the first cross valve 10 in step S110 and step S120; and in step S130 and step S140, complete the switch operation of the second cross valve 20; thus when performing step S150 and starting the first compressor 11 and the second compressor 21; dual-system air conditioning group can be made to enter fast heat and heat recovery mode; effectively avoid the problem causing the thermal shock of dual-system air conditioning group because of a certain cooling system, protection is shut down, thus ensure that the operational reliability of the control method of dual-system air conditioning group.
Preferably, step S110 comprises: the step S111: the first compressor 11 starts; Step S112: time delay waited for for first scheduled time; Step S113: the first cross valve 10 switch operation.Because the first cross valve 10 is commutated by pressure, thus when after the first compressor 11 startup also time delay first scheduled time, the first cross valve 10 just can complete switch operation, thus ensure that the commutation reliability of the first cross valve 10.
Preferably, step S130 comprises: the step S131: the second compressor 21 starts; Step S132: time delay waited for for second scheduled time; Step S133: the second cross valve 20 switch operation.Because the second cross valve 20 is commutated by pressure, thus when after the second compressor 21 startup also time delay second scheduled time, the second cross valve 20 just can complete switch operation, thus ensure that the commutation reliability of the second cross valve 20.
Preferably, step S150 comprises: the step S151: the first compressor 11 starts; Step S152: time delay waited for for the 3rd scheduled time; Step S153: the second compressor 21 starts.Just start because the first compressor 11 starts rear second compressor 21, thus effectively avoid the two to start the impact that may cause electrical network simultaneously, improve the safety in operation of dual-system air conditioning group, and ensure that the startup reliability of dual-system air conditioning group.
Control method in the present invention also comprises running S200, and running S200 is the duty of environmentally thermic load situation determination the first system and second system.By the duty of environmentally thermic load situation determination the first system and second system, effectively can avoid energy waste, and ensure the operational reliability of the first system and second system.
As shown in Figure 2, running S200 comprises: step S210: the actual inflow temperature detecting dual-system air conditioning group, to determine the duty of the first system and second system, step S210 is repeated when the duty of the first system and second system is all constant, only continue step S220 when the second compressor 21 of second system is shut down and needs to restart the second compressor 21, step S230 is continued when the first compressor 11 of the first system and the second compressor 21 are all shut down, only keep the duty of the first system constant when the second compressor 21 is shut down and without the need to restarting the second compressor 21 and repeat step S210, step S220: judge whether restart the second compressor 21 causes thermal shock to the first system, and determine directly to restart the second compressor 21 or repeat step S110 again to step S150 after being shut down by the first compressor 11, step S230: repeat step S110 to step S150.By detecting the actual inflow temperature of dual-system air conditioning group; the ruuning situation that dual-system air conditioning group is current can be determined; when environmental heat load declines; when requiring to reduce to the thermal output of dual-system air conditioning group; by by least one system-down; ensureing that heat supply is reliable while, energy consumption can be reduced, reduces the power consumption of dual-system air conditioning group, thus improve the operational reliability of dual-system air conditioning group.
It should be noted that, when the actual inflow temperature of dual-system air conditioning group is detected, detection be the inflow temperature value using side heat exchanger 40.
Preferably, step S210 comprises: step S211: the actual inflow temperature detecting dual-system air conditioning group, the actual inflow temperature of dual-system air conditioning group and target water temperature are compared, when the actual inflow temperature of dual-system air conditioning group is more than or equal to target water temperature, the second compressor 21 is shut down, and continue step S212, otherwise, keep the duty of the first system and second system constant, and repeat step S211; Step S212: continue the actual inflow temperature detecting dual-system air conditioning group; the actual inflow temperature of dual-system air conditioning group and target water temperature are compared; when the actual inflow temperature of dual-system air conditioning group is still greater than target water temperature, the first compressor 11 is shut down and continued step S230; keep the duty of the first system constant when the actual inflow temperature of dual-system air conditioning group equals target water temperature and repeat step S212, continuing step S220 when the actual inflow temperature of dual-system air conditioning group is less than target water temperature.
In step S211; when the actual inflow temperature of dual-system air conditioning group is too high; illustrate that now carrying capacity of environment power consumption that is little, dual-system air conditioning group is too much; now can pass through a system-down; and reduce the output of dual-system air conditioning group; thus make the dual-system air conditioning group of an only system works meet the demand of now carrying capacity of environment, avoid the waste of the energy.But, when the actual inflow temperature of dual-system air conditioning group is too small, illustrate that now dual-system air conditioning group can't meet the requirement of carrying capacity of environment, therefore need to work on, to promote environment temperature.
In step S212, when after unloading system, when the actual inflow temperature detecting dual-system air conditioning group is still too high, illustrate that the power consumption of now dual-system air conditioning group is still too high, carrying capacity of environment is very little, cannot consume too much heat, now two systems can be unloaded completely, to avoid the waste of the energy.But when the actual inflow temperature of dual-system air conditioning group reduces and is less than target water temperature, now need the system of having shut down again to come into operation, namely continue step S220.When actual inflow temperature is consistent with target water temperature, illustrates that dual-system air conditioning group enters steady operational status, now keep this running status, until thermic load changes.
The change of thermic load is described for example, and suppose that dual-system air conditioning group is simultaneously to the heat supply of multiple rooms, as long as there is more than one room to close air conditioning function, the thermic load of dual-system air conditioning group will reduce.Now dual-system air conditioning group can differentiate whether reach user's requirement, needs stopping system; When the room closing air conditioning function is more time, dual-system air conditioning group agree temporarily to stop all systems.
In step S220, when needs restart the second compressor 21, blindly the second compressor 21 can not be started, but whether the startup that should detect the second compressor 21 can cause thermal shock to the first system, when determining that the startup of the second compressor 21 can not cause during thermal shock and the second compressor 21 can be started the first system, if determine that the second compressor 21 can cause thermal shock to the first system, step S110 is repeated again to step S150 after then needing the first compressor 11 to shut down, this is because when the second compressor 21 meeting causes thermal shock to the first system, rashly the second compressor 21 is started, refrigeration work mode influences the first system when second system can be made to start normally heat mode of operation, the actual water temperature of dual-system air conditioning group can be caused to reduce, thus cause dual-system air conditioning group to there is the risk of cancel closedown, also the first cross valve 10 and/or the second cross valve 20 liquid hammer is easily caused.Particularly after a period of time shut down by the second compressor 21; after the pressure differential collapses of the second cross valve 20; second cross valve 20 can get back to original state; namely refrigeration work position; before now needing startup second compressor 21, must consider that the second compressor 21 starts the problem that whether can cause thermal shock to the first system.
Preferably, step S220 comprises: step S221: the actual exhaust air temperature detecting the first compressor 11, by actual exhaust air temperature compared with target exhaust temperature, when actual exhaust air temperature is more than or equal to target exhaust temperature, second system can not cause thermal shock to the first system and continue step S222, otherwise continues step S223; Step S222: the second compressor 21 is opened, and repeats step S210 to step S230; Step S223: second system can cause thermal shock to the first system when actual exhaust air temperature is less than target exhaust temperature, repeats step S110 again to step S150 after being shut down by the first compressor 11.
In step S221 and step S222, when actual exhaust air temperature is more than or equal to target exhaust temperature, illustrate that the heating capacity of now the first system is stronger, even if now the second compressor 21 is opened, also can not cause larger impact to the first system, thus the operation stability of dual-system air conditioning group can be ensured.
In step S221 and step S223; when actual exhaust air temperature is less than target exhaust temperature; illustrate that the heating capacity of now the first system is more weak; now rashly the second compressor 21 is opened; the situation that dual-system air conditioning group exists heating simultaneously, freezes can be caused; thus now need the first compressor 11 to shut down, then carrying out starting up by above-mentioned start process S100, thus ensure that the functional reliability of dual-system air conditioning group.
Preferably, target exhaust temperature is 60 degrees Celsius.
Control method in the present invention also comprises shutdown process S300, and shutdown process S300 is the heat recovery function first stopping the first system and second system before the first compressor 11 and the second compressor 21 are shut down.
As shown in Figure 4, shutdown process S300 comprises: step S310: closed by the heat recovery function of the first system and second system; Step S320: time delay the 4th scheduled time; Step S330: the first compressor 11 and the second compressor 21 are shut down; Step S340: time delay the 5th scheduled time; Step S350: the first cross valve 10 and the commutation of the second cross valve 20 are reset to refrigeration work pattern.
Preferably, the 4th scheduled time was 5 minutes.Preferential stopping heat recovery function stopping the first compressor 11 and the second compressor 21 again after 5 minutes; can guarantee that in the first cross valve 10 and the second cross valve 20 are all overheated gas; without liquid refrigerants, thus after preventing shutting down power-off, the first cross valve 10 and/or the commutation of the second cross valve 20 cause the problem of liquid hazards.
In step S330, after the first compressor 11 and the second compressor 21 are shut down, can not start according to heating water temperature change again.
Preferably, by closing the recuperation of heat water pump of the first system and second system to be closed by heat recovery function.When recuperation of heat water pump cuts out, now heat recovering heat exchanger 12 is common pipeline, no longer plays the effect of recuperation of heat.
By arranging the relation of a kind of control method scheduling compressor and cross valve start and stop in the present invention; realize dual-system air conditioning group to heat in the winter time and three strategic points under hot water function: start, run, system unit reliably controls when terminating to shut down; reduce the hidden danger of high frequent start and stop, cross valve liquid hammer, improve the reliability of unit operation.
As can be seen from the above description, the above embodiments of the present invention achieve following technique effect:
1, ensure that user heats the stability with hot water function, dual-system air conditioning group need not frequent start-stop, just can realize completely heating and hot water function, substantially increases the comfortableness that user uses;
2, adopting control method in the present invention can compressor in available protecting dual-system air conditioning group and cross valve, by arranging effectively reasonably control sequence, compressor and cross valve service life can be improved;
3, dual-system air conditioning group has the good feature of operational reliability, in running, can regulate the state of dual-system air conditioning group according to the change of actual heating load in time.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (13)
1. for a control method for dual-system air conditioning group, it is characterized in that, comprise start process S100, described start process S100, after the first system and second system all complete and heat working mode change, restarts described the first system and described second system.
2. control method according to claim 1, it is characterized in that, described in heat working mode change method be first cross valve (10) of described the first system and second cross valve (20) of described second system are converted to by initial refrigeration work pattern connected state heat mode of operation connected state.
3. control method according to claim 1 and 2, is characterized in that, described start process S100 comprises:
Step S110: first compressor (11) of described the first system starts, heats mode of operation described in described first cross valve (10) commutation extremely;
Step S120: described first compressor (11) is shut down;
Step S130: second compressor (21) of described second system starts, heats mode of operation described in described second cross valve (20) commutation extremely;
Step S140: described second compressor (21) is shut down;
Step S150: described first compressor (11) and described second compressor (21) start.
4. control method according to claim 3, is characterized in that, described step S110 comprises:
Step S111: described first compressor (11) starts;
Step S112: time delay waited for for first scheduled time;
Step S113: described first cross valve (10) switch operation.
5. control method according to claim 3, is characterized in that, described step S130 comprises:
Step S131: described second compressor (21) starts;
Step S132: time delay waited for for second scheduled time;
Step S133: described second cross valve (20) switch operation.
6. control method according to claim 3, is characterized in that, described step S150 comprises:
Step S151: described first compressor (11) starts;
Step S152: time delay waited for for the 3rd scheduled time;
Step S153: described second compressor (21) starts.
7. control method according to claim 1, is characterized in that, described control method also comprises running S200, and described running S200 is that environmentally thermic load situation determines the duty of described the first system and described second system.
8. control method according to claim 7, is characterized in that, described running S200 comprises:
Step S210: the actual inflow temperature detecting dual-system air conditioning group, to determine the duty of described the first system and described second system, the repeating said steps S210 when the duty of described the first system and described second system is all constant, only when second compressor (21) of described second system is shut down and continues step S220 when needing to restart described second compressor (21), step S230 is continued when first compressor (11) of described the first system and described second compressor (21) are all shut down, only keep the duty of described the first system constant and repeating said steps S210 when described second compressor (21) is shut down and without the need to restarting described second compressor (21),
Described step S220: judge whether restart described second compressor (21) causes thermal shock to described the first system, and determine directly to restart described second compressor (21) or repeat described start process S100 again after described first compressor (11) being shut down;
Described step S230: repeat described start process S100.
9. control method according to claim 8, is characterized in that, described step S210 comprises:
Step S211: the described actual inflow temperature detecting described dual-system air conditioning group, the described actual inflow temperature of described dual-system air conditioning group and target water temperature are compared, when the described actual inflow temperature of described dual-system air conditioning group is more than or equal to described target water temperature, described second compressor (21) is shut down, and continue step S212, otherwise, keep the duty of described the first system and described second system constant, and repeating said steps S211;
Described step S212: continue the described actual inflow temperature detecting described dual-system air conditioning group, the described actual inflow temperature of described dual-system air conditioning group and described target water temperature are compared, when the described actual inflow temperature of described dual-system air conditioning group is still greater than described target water temperature, described first compressor (11) is shut down and continued described step S230, keep the duty of described the first system constant and repeating said steps S212 when the described actual inflow temperature of described dual-system air conditioning group equals described target water temperature, described step S220 is continued when the described actual inflow temperature of described dual-system air conditioning group is less than described target water temperature.
10. control method according to claim 8, is characterized in that, described step S220 comprises:
Step S221: the actual exhaust air temperature detecting described first compressor (11), by described actual exhaust air temperature compared with target exhaust temperature, when described actual exhaust air temperature is greater than described target exhaust temperature, described second system can not cause thermal shock to described the first system and continue step S222, otherwise continues step S223;
Described step S222: described second compressor (21) is opened, and repeating said steps S210 to described step S230;
Described step S223: described second system can cause thermal shock to described the first system when described actual exhaust air temperature is less than described target exhaust temperature, repeats described start process S100 after described first compressor (11) being shut down again.
11. control methods according to claim 3; it is characterized in that; described control method also comprises shutdown process S300, and described shutdown process S300 is the heat recovery function first stopping described the first system and described second system before described first compressor (11) and described second compressor (21) are shut down.
12. control methods according to claim 11, is characterized in that, described shutdown process S300 comprises:
Step S310: the heat recovery function of described the first system and described second system is closed;
Step S320: time delay the 4th scheduled time;
Step S330: described first compressor (11) and described second compressor (21) are shut down;
Step S340: time delay the 5th scheduled time;
Step S350: described first cross valve (10) and described second cross valve (20) commutation are reset to refrigeration work pattern.
13. control methods according to claim 11, is characterized in that, by closing the recuperation of heat water pump of described the first system and described second system to be closed by described heat recovery function.
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