CN107091545A - A kind of falling film evaporator suitable for low pressure refrigerant - Google Patents
A kind of falling film evaporator suitable for low pressure refrigerant Download PDFInfo
- Publication number
- CN107091545A CN107091545A CN201610092328.XA CN201610092328A CN107091545A CN 107091545 A CN107091545 A CN 107091545A CN 201610092328 A CN201610092328 A CN 201610092328A CN 107091545 A CN107091545 A CN 107091545A
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- China
- Prior art keywords
- liquid
- evaporator
- falling film
- gas
- chamber
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Links
- 239000003507 refrigerant Substances 0.000 title claims abstract description 59
- 239000011552 falling film Substances 0.000 title claims abstract description 34
- 239000007788 liquid Substances 0.000 claims abstract description 91
- 238000001704 evaporation Methods 0.000 claims abstract description 26
- 238000000926 separation method Methods 0.000 claims abstract description 25
- 230000008020 evaporation Effects 0.000 claims abstract description 23
- 230000004888 barrier function Effects 0.000 claims abstract description 11
- 239000010408 film Substances 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 5
- 230000005484 gravity Effects 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 4
- 230000000694 effects Effects 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 2
- 238000010276 construction Methods 0.000 abstract description 2
- 230000007547 defect Effects 0.000 abstract description 2
- 229910000831 Steel Inorganic materials 0.000 description 4
- 238000005057 refrigeration Methods 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000008021 deposition Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000010025 steaming Methods 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 238000004378 air conditioning Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B39/00—Evaporators; Condensers
- F25B39/02—Evaporators
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
Abstract
The invention discloses a kind of falling film evaporator suitable for low pressure refrigerant, including evaporator tube, demister, distributor and liquid barrier, the evaporator tube is divided into the return-air chamber that the first chamber and remainder of side are constituted below the demister by the demister and the liquid barrier；First chamber is divided into superposed gas-liquid separation chamber and the evaporation cavity positioned at bottom by the distributor, and the return-air chamber is connected with the evaporation cavity bottom.The falling film evaporator of the present invention overcomes the defect of refrigerant distributor in traditional falling film evaporator, can be applied to the system using low pressure refrigerant, and it has the advantages that, and simple in construction, heat transfer efficiency is high, refrigerant charge is few.
Description
Technical field
The present invention relates to refrigeration technology field, more particularly to a kind of band gas suitable for low pressure refrigerant
The falling film evaporator of liquid disengagement chamber.
Background technology
Falling film evaporator is higher with its heat transfer efficiency, and the features such as refrigerant charge is less exists
Applied on increasing refrigeration air-conditioning unit.Falling film evaporator is generally using shown in Fig. 1
Structure, it includes evaporator outlet pipe 25, feed tube 24, refrigerant distributor 22 and evaporation
Tube bank 23.Gas-liquid two-phase cold-producing medium enters in evaporator by feed tube 24, is distributed by refrigerant
Refrigerant liquid, which is dropped in steam-generating bank 23, after device 22 carries out evaporation and heat-exchange, the refrigerant gas of generation
Body is discharged into compressor through evaporator outlet pipe 25.Refrigerant distributor 22 in Fig. 1 is drop
Critical component in film evaporator, to realize that refrigerant is evenly distributed in steam-generating bank, typically will
Asking the interior outside of refrigerant distributor has sufficiently large pressure difference.Such as, mesohigh refrigerant is being used
In the refrigeration unit of (such as R134a), the inside and outside side pressure difference of refrigerant distributor need to generally reach
150~300kPa.
Low pressure refrigerant R1233zd (E) because its it is environmentally friendly, efficient the advantages of, be subjected to refrigeration air-conditioner
Industry is more and more paid close attention to, and table 1 is typical cooling condition (5 DEG C of an evaporating temperature, condensation
36.7 DEG C of temperature) under, R1233zd (E) and R134a evaporating pressures, the comparison of condensing pressure can
To see, the difference of R1233zd (E) evaporating pressures and condensing pressure only has the 23.1% of R134a.It is right
Refrigerant distributor in the low pressure refrigerants such as R1233zd (E), traditional falling film evaporator obviously can not
Meet and require.
The exemplary refrigerant operating mode of table 1
Accordingly, it would be desirable to which one kind can more effectively evenly distribute refrigerant to heat exchanger tube, it is adaptable to low pressure
The falling film evaporator of refrigerant environment.
The content of the invention
It is an object of the invention to provide a kind of falling film evaporator suitable for low pressure refrigerant, overcome
Traditional falling film evaporator is applied to the defect of the refrigerant distributor under low pressure refrigerant environment, very well
The problem of falling film evaporator refrigerant that ground solves low pressure refrigerant is distributed, can be applied to use
The system of low pressure refrigerant.
On the one hand, the invention provides a kind of falling film evaporator suitable for low pressure refrigerant, bag
Include evaporator tube, in addition to demister, distributor and liquid barrier, the demister and the gear
The evaporator tube is divided into the first chamber and remainder of the side below the demister by liquid plate
The return-air chamber being grouped；First chamber is divided into superposed gas-liquid separation chamber by the distributor
With the evaporation cavity positioned at bottom, the return-air chamber is connected with the evaporation cavity bottom.
In one embodiment, the falling film evaporator also includes evaporator inlet pipe, the steaming
Hair device inlet tube is connected with the gas-liquid separation chamber.
In one embodiment, provided with falling liquid film tube bank in the evaporation cavity.
In one embodiment, the falling film evaporator also includes evaporator outlet pipe, the steaming
Hair device outlet is connected with the return-air chamber.
In one embodiment, the evaporator outlet pipe is connected with compressor air suction mouthful.
In one embodiment, axial direction of the distributor along the evaporator tube is in arc
Shape, middle high, two ends are low.
In one embodiment, demister is filter screen or Z-shaped plate.
In one embodiment, a point liquid bath, described point are provided with below the evaporator inlet pipe
The two ends that axially extend to the evaporator tube of the liquid bath along the evaporator tube.
In one embodiment, the distributor be porous media material or porous plate, such as it is many
Orifice plate or steel wire.
On the other hand, present invention also offers the method using above-mentioned falling film evaporator, the side
Method includes：
Gas-liquid two-phase cold-producing medium enters the gas-liquid separation chamber by the evaporator inlet pipe, described
Gas-liquid separation intracavitary, due to the effect of gravity, gas-liquid two-phase cold-producing medium is separated；
After the gaseous refrigerant is via the demister, into the return-air chamber；
Liquid refrigerant is deposited on the bottom of the gas-liquid separation chamber, forms the liquid level of certain altitude,
Via the distributor, equably drop onto and carry out evaporation and heat-exchange in the falling liquid film tube bank；
Evaporate the gaseous refrigerant of generation, the opening through the liquid barrier bottom, into the return-air
Chamber, with entering through the demister after the gaseous refrigerant of the return-air chamber converges through the evaporator
Outlet enters compressor air suction mouthful.
In one embodiment, after refrigerant enters described point of liquid bath, liquid deposition is described
Divide in liquid bath, after liquid fills described point of liquid bath, overflowed at the top of described point of liquid bath.
In another embodiment, refrigerant enters the gas-liquid separation by the evaporator inlet pipe
After chamber, liquid axially flows along the evaporator tube to the evaporator tube two ends.
Any combination of the present invention including any of the above-described or multiple embodiments.
The invention provides a kind of falling film evaporation with gas-liquid separation chamber suitable for low pressure refrigerant
Device, it has simple in construction, heat transfer efficiency height, the advantages of refrigerant charge is few.
It should be appreciated that foregoing description substantially and follow-up description in detail are that exemplary illustration is conciliate
Release, the limitation to claimed content of the invention should not be used as.
Brief description of the drawings
With reference to the accompanying drawing enclosed, inventing more purposes, function and advantage will be by present invention implementation
The described below of mode is illustrated, wherein：
Fig. 1 diagrammatically illustrates traditional falling film evaporator structural representation；
Fig. 2 schematically shows a kind of falling film evaporator structural representation with gas-liquid separation chamber；
Fig. 3 shows the porous plate schematic diagram that can be used as distributor；
Fig. 4 shows the steel wire schematic diagram that can be used as distributor；
Fig. 5 shows the Z-shaped plate schematic diagram that can be used as demister；
Fig. 6 schematically shows another falling film evaporator structural representation with gas-liquid separation chamber, steams
Send out below device inlet tube provided with a point liquid bath；
Fig. 7 schematically shows another falling film evaporator structural representation with gas-liquid separation chamber, point
Orchestration is curved.
Embodiment
By reference to one exemplary embodiment, the purpose and function of invention and for realizing these purposes
It will be illustrated with the method for function.However, invention be not limited to it is as disclosed below exemplary
Embodiment；It can be realized by multi-form.The essence of specification is only to aid in
The detail of various equivalent modifications Integrated Understanding invention.
Hereinafter, the embodiment of invention will be described with reference to the drawings.In the accompanying drawings, identical accompanying drawing
Mark represents same or similar part, or same or like step.
Embodiments of the present invention are illustrated below in conjunction with the accompanying drawings.
Embodiment one
One kind that the present invention is provided be applied to falling film evaporator structural representation as shown in Fig. 2 including
Evaporator tube 210, in addition to demister 202, distributor 204 and liquid barrier 209, demister
202 and liquid barrier 209 by 202 points of evaporator tube be positioned at the first of the lower section side of demister 202
The return-air chamber 207 of chamber and remainder composition；First chamber is divided into positioned at distributor by distributor 204
The gas-liquid separation chamber 203 on 204 tops and the evaporation cavity 206 positioned at the bottom of distributor 204, return-air chamber
207 connect with the bottom of evaporation cavity 206.Two phase refrigerant enters gas-liquid point by evaporator inlet pipe 201
From chamber 203, in gas-liquid separation chamber 203, due to the effect of gravity, gas-liquid refrigerant is separated.
Gaseous refrigerant is via being arranged on after the demister 202 at the top of gas-liquid separation chamber 203, into return-air
Chamber 207.Liquid refrigerant is deposited on the distributor 204 of the bottom of gas-liquid separation chamber 203, shape
Into the liquid level of certain altitude, via distributor 204, equably drop onto and carried out in falling liquid film tube bank 205
Evaporation and heat-exchange, evaporates opening of the gaseous refrigerant through the bottom of liquid barrier 209 of generation, into return-air
Chamber 207, after converging with the gaseous refrigerant through demister 202 into return-air chamber 207, through evaporator
Outlet 208 enters compressor air suction mouthful.
Wherein, the cross sectional shape of evaporator tube 210 can be rectangle as shown in Figure 2, may be used also
To be circular or other shapes.Axial direction of the liquid barrier 209 along evaporator tube 210 is through whole
Individual cylinder, can be vertically arranged using such as Fig. 2, can also use other non-vertical set-up modes,
Its cross sectional shape can be rectangle, arc or other shapes.
Wherein, distributor 204 can using porous plate 302 (having hole 301 on porous plate) shown in Fig. 3,
Steel wire shown in Fig. 4 or other porous media materials.Refrigerant liquid is deposited on distributor 204,
Reach after certain liquid level, into the liquid and outflow gas-liquid separation chamber 203 of gas-liquid separation chamber 203
Amount of liquid into evaporation cavity 206 reaches balance.
Assuming that the pressure drop for flowing through distributor 204 is reduced to Δ P, then the liquid level h in gas-liquid separation chamber
It is represented by：
Wherein, ρ is refrigerant liquid volume density, and g is acceleration of gravity.
The design of refrigerant distributor needs to meet, and flows through the pressure drop Δ P of the generation of distributor 204 one
In fixed scope, certain liquid level h was so both can guarantee that, to meet refrigerant distributing uniformity
Requirement, and the design requirement using low pressure refrigerant system can be met.
Demister 202 can use Z-shaped plate shown in Fig. 5, it would however also be possible to employ such as distributor 204
The porous media materials such as steel wire.When refrigerant gas flows through demister 202, wherein the liquid carried secretly
Foam is attached on demister 202, reach it is a certain amount of after drop back into gas-liquid separation chamber 203.
Embodiment two
Fig. 6 is the embodiment of the present invention two, compared with embodiment one, is increased in evaporator tube 611
Add point liquid bath 607 for being arranged on the lower section of evaporator inlet pipe 601, divide liquid bath 607 along evaporator cylinder
The axial direction of body 611 runs through whole evaporator tube 611.Refrigerant enters after point liquid bath 607,
Liquid deposition is in point liquid bath 607, after liquid fills point liquid bath 607, can be from a point liquid bath 607
Groove top overflow.Compared with embodiment one, increase point liquid bath 607 is conducive to refrigerant along evaporation
The uniformity of the axial direction distribution of device cylinder 611.In the present embodiment, 602 be demister, 603
It is gas-liquid separation chamber, 604 be distributor, and 605 be falling liquid film tube bank, and 606 be evaporation cavity, and 608 are
Return-air chamber, 609 be evaporator outlet pipe, and 610 be liquid barrier.
Embodiment three
Fig. 7 is the embodiment of the present invention three, compared with embodiment one, distributor 702 along evaporator cylinder
The axial direction of body is curved, and middle high, two ends are low.Refrigerant is entered by evaporator inlet pipe 704
Enter after gas-liquid separation chamber 701, liquid can have along evaporator tube axially to the flowing of cylinder two ends
Beneficial to the distributing uniformity of refrigerant vertically.In this example, 705 be demister, and 703 be evaporation
Chamber.
Explanation and practice with reference to the invention disclosed here, the other embodiment of invention is for this area
Technical staff will be readily apparent and understand.Illustrate and embodiment be to be considered only as it is exemplary,
The true scope and purport of invention are defined in the claims.
Claims (9)
1. a kind of falling film evaporator with gas-liquid separation chamber suitable for low pressure refrigerant, including evaporation
Device cylinder (210,611), it is characterised in that also including demister (202,602,705), divide
Orchestration (204,604,702) and liquid barrier (209,610), the demister and the gear liquid
The evaporator tube is divided into the first chamber and remainder of the side below the demister by plate
The return-air chamber (207,608) of composition；First chamber is divided into superposed gas by the distributor
Liquid disengagement chamber (203,603,701) and the evaporation cavity (206,606,703) positioned at bottom, institute
Return-air chamber is stated to connect with the evaporation cavity bottom.
2. falling film evaporator according to claim 1, it is characterised in that the falling film evaporation
Device also includes evaporator inlet pipe (201,601,704), the evaporator inlet pipe and the gas
Liquid disengagement chamber is connected.
3. falling film evaporator according to claim 1, it is characterised in that in the evaporation cavity
It is provided with falling liquid film tube bank (205,605).
4. falling film evaporator according to claim 1, it is characterised in that the falling film evaporation
Device also includes evaporator outlet pipe (208,609), and the evaporator outlet pipe connects with the return-air chamber
It is logical.
5. falling film evaporator according to claim 1, it is characterised in that the distributor edge
The axial direction of the evaporator tube is curved, and middle high, two ends are low.
6. falling film evaporator according to claim 1, it is characterised in that demister is filter screen
Or Z-shaped plate.
7. falling film evaporator according to claim 1, it is characterised in that the evaporator enters
A point liquid bath (607), axial direction side of the described point of liquid bath along the evaporator tube are provided with below mouth pipe
To the two ends for extending to the evaporator tube.
8. falling film evaporator according to claim 1 or 5, it is characterised in that the distribution
Device is porous media material or porous plate (302).
9. use the method for the falling film evaporator according to any one of claim 1-8, methods described bag
Include：
Gas-liquid two-phase cold-producing medium enters the gas-liquid separation chamber by the evaporator inlet pipe, described
Gas-liquid separation intracavitary, due to the effect of gravity, gas-liquid two-phase cold-producing medium is separated；
After the gaseous refrigerant is via the demister, into the return-air chamber；
Liquid refrigerant is deposited on the bottom of the gas-liquid separation chamber, forms the liquid level of certain altitude,
Via the distributor, equably drop onto and carry out evaporation and heat-exchange in the falling liquid film tube bank；
Evaporate the gaseous refrigerant of generation, the opening through the liquid barrier bottom, into the return-air
Chamber, with entering through the demister after the gaseous refrigerant of the return-air chamber converges through the evaporator
Outlet enters compressor air suction mouthful.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610092328.XA CN107091545B (en) | 2016-02-18 | 2016-02-18 | Falling film evaporator suitable for low-pressure refrigerant |
| US15/436,157 US10267547B2 (en) | 2016-02-18 | 2017-02-17 | Falling-film evaporator suitable for low pressure refrigerant |
| US16/387,364 US10982885B2 (en) | 2016-02-18 | 2019-04-17 | Falling-film evaporator suitable for low pressure refrigerant |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610092328.XA CN107091545B (en) | 2016-02-18 | 2016-02-18 | Falling film evaporator suitable for low-pressure refrigerant |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107091545A true CN107091545A (en) | 2017-08-25 |
| CN107091545B CN107091545B (en) | 2024-05-03 |
Family
ID=59648750
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610092328.XA Active CN107091545B (en) | 2016-02-18 | 2016-02-18 | Falling film evaporator suitable for low-pressure refrigerant |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107091545B (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108709339A (en) * | 2018-07-02 | 2018-10-26 | 珠海格力电器股份有限公司 | Liquid distributor, falling film evaporator and air conditioner |
| CN111213022A (en) * | 2017-10-20 | 2020-05-29 | 江森自控科技公司 | Falling film heat exchanger |
| WO2020119266A1 (en) * | 2018-12-14 | 2020-06-18 | 珠海格力电器股份有限公司 | Falling film evaporator and air conditioner |
| CN111919075A (en) * | 2018-04-06 | 2020-11-10 | 开利公司 | Integrated separator and distributor |
| CN111928530A (en) * | 2020-07-27 | 2020-11-13 | 青岛海尔空调电子有限公司 | Heat exchanger and air-cooled heat pump unit with same |
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| US5561987A (en) * | 1995-05-25 | 1996-10-08 | American Standard Inc. | Falling film evaporator with vapor-liquid separator |
| US6868695B1 (en) * | 2004-04-13 | 2005-03-22 | American Standard International Inc. | Flow distributor and baffle system for a falling film evaporator |
| CN201852512U (en) * | 2010-09-21 | 2011-06-01 | 珠海格力节能环保制冷技术研究中心有限公司 | Liquid distributing device of falling film evaporator |
| CN201983533U (en) * | 2010-09-03 | 2011-09-21 | 广东工业大学 | Gas-liquid separation type falling film evaporator |
| WO2013035508A1 (en) * | 2011-09-09 | 2013-03-14 | 三井海洋開発株式会社 | Falling liquid film heat exchanger, absorption refrigeration system, ship, offshore structure, and underwater structure |
| CN103673420A (en) * | 2012-09-14 | 2014-03-26 | 约克（无锡）空调冷冻设备有限公司 | Refrigerant distributor used in falling film evaporator and falling film evaporator |
| US20160108762A1 (en) * | 2013-05-01 | 2016-04-21 | United Technologies Corporation | Falling film evaporator for power generation systems |
| CN205403254U (en) * | 2016-02-18 | 2016-07-27 | 约克（无锡）空调冷冻设备有限公司 | Falling film evaporation ware suitable for pressure refrigerant |
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2016
- 2016-02-18 CN CN201610092328.XA patent/CN107091545B/en active Active
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| US5561987A (en) * | 1995-05-25 | 1996-10-08 | American Standard Inc. | Falling film evaporator with vapor-liquid separator |
| US6868695B1 (en) * | 2004-04-13 | 2005-03-22 | American Standard International Inc. | Flow distributor and baffle system for a falling film evaporator |
| CN201983533U (en) * | 2010-09-03 | 2011-09-21 | 广东工业大学 | Gas-liquid separation type falling film evaporator |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111213022A (en) * | 2017-10-20 | 2020-05-29 | 江森自控科技公司 | Falling film heat exchanger |
| US12098889B2 (en) | 2017-10-20 | 2024-09-24 | Tyco Fire & Security Gmbh | Falling film heat exchanger |
| CN111919075A (en) * | 2018-04-06 | 2020-11-10 | 开利公司 | Integrated separator and distributor |
| US11619428B2 (en) | 2018-04-06 | 2023-04-04 | Carrier Corporation | Integrated separator and distributor |
| CN108709339A (en) * | 2018-07-02 | 2018-10-26 | 珠海格力电器股份有限公司 | Liquid distributor, falling film evaporator and air conditioner |
| WO2020006992A1 (en) * | 2018-07-02 | 2020-01-09 | 珠海格力电器股份有限公司 | Liquid distributor, falling film evaporator, and air conditioner |
| WO2020119266A1 (en) * | 2018-12-14 | 2020-06-18 | 珠海格力电器股份有限公司 | Falling film evaporator and air conditioner |
| CN111928530A (en) * | 2020-07-27 | 2020-11-13 | 青岛海尔空调电子有限公司 | Heat exchanger and air-cooled heat pump unit with same |
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| Publication number | Publication date |
|---|---|
| CN107091545B (en) | 2024-05-03 |
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