CN110207519B - Series-parallel loop two-phase thermosiphon - Google Patents
Series-parallel loop two-phase thermosiphon Download PDFInfo
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- CN110207519B CN110207519B CN201910476186.0A CN201910476186A CN110207519B CN 110207519 B CN110207519 B CN 110207519B CN 201910476186 A CN201910476186 A CN 201910476186A CN 110207519 B CN110207519 B CN 110207519B
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- 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
- F25B43/00—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D15/00—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies
- F28D15/02—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies in which the medium condenses and evaporates, e.g. heat pipes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D9/00—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
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- Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
The invention discloses a series-parallel loop two-phase thermosiphon which can effectively improve the unreasonable flow distribution of working media in a double evaporator, increase the heat transfer performance of a system and improve the starting performance of the system. The serial-parallel loop two-phase thermosiphon comprises a condenser, a gas-liquid separator, a first evaporator, a second evaporator, a liquid pipe, an air pipe and a first two-phase pipe; the first outlet of the condenser is connected with the inlet of the liquid pipe; the first outlet of the liquid pipe is connected with the inlet of the first evaporator, the outlet of the first evaporator is connected with the inlet of the gas-liquid separator, the first outlet of the gas-liquid separator is connected with the first inlet of the condenser through the air pipe, and the second outlet of the gas-liquid separator is connected with the inlet of the second evaporator; the second outlet of the liquid pipe is connected with the inlet of the second evaporator; the outlet of the second evaporator is connected to the first inlet of the condenser via a first two-phase tube.
Description
Technical Field
The invention belongs to the technical field of heat pipes, and particularly relates to a series-parallel connection type loop two-phase thermosiphon.
Background
With the rapid increase of the number and investment scale of the information rooms, the power consumption of the information rooms is increased day by day, which causes huge resource load to enterprises and society and restricts the upgrading and expansion of the information rooms. The traditional information machine room cooling adopts an air conditioning unit to dissipate heat. However, the air conditioning unit is required to supply cold all the year round due to the large heat load of the information machine room, so that the air conditioner based on the single vapor compression refrigeration method has large electric energy consumption which accounts for 45% of the total electric energy consumption. In addition, in winter in the north and transition seasons, when the outdoor air temperature is lower than the indoor air temperature, the traditional vapor compression refrigeration mode can not utilize the natural cold source to cool the air in the information machine room, thereby causing the waste of the natural cold source. Therefore, exploring a natural cooling technology for providing a natural cold source for an information machine room by utilizing outdoor low-temperature air so as to reduce the operation energy consumption becomes one of the development directions of energy conservation and emission reduction of various information machine rooms.
The natural cooling technology is applied in direct or indirect air natural cooling, direct or indirect evaporative cooling, and natural cooling using heat pipes. The loop two-phase thermosiphon is used as one of the heat pipes, and has the advantages of being capable of selecting a proper evaporation and condensation heat exchanger type according to the application background, being easier to install and the like, and being widely applied to cooling of an information machine room. The heat exchange modes of the two-phase loop thermosiphon which is currently applied to cooling of an information machine room are mainly two: the loop two-phase thermosiphon exchanges heat with indoor and outdoor air of the information machine room, and a plurality of evaporators of the loop two-phase thermosiphon exchange heat with an electronic chip in the information machine room in a direct contact mode. The related research aiming at the former is more and tends to mature. However, when the loop two-phase thermosiphon exchanges heat with the air inside and outside the information machine room, in order to ensure that the chip with the maximum heat flux can work normally, large temperature difference air supply is generally adopted, so that the cooling energy consumption is large. In addition, when the electronic chip is cooled by air cooling, the areas of the bottom plate of the fin radiator connected with the chip are greatly different from the area of the chip, so that the problems of large temperature gradient, poor heat exchange effect and the like of the bottom plate of the radiator are caused. And the problem can be effectively solved by adopting a plurality of evaporators to directly contact with the electronic chip for heat exchange. Therefore, research is carried out on the two-phase thermosiphon of the multi-heat-source (multi-evaporator) loop to improve the cooling performance of the information machine room and reduce the energy consumption of the information machine room.
Taking a double-evaporator as an example, under the condition of non-uniform heat flow, the parallel double-evaporator loop two-phase thermosiphon has the problems that the heat transfer effect of the evaporator is poor due to too little working medium flow in the evaporator with high heat flow density, the working medium is wasted due to too much working medium flow in the evaporator with low heat flow density, the working medium in the double-evaporator is unreasonable in distribution and the like. In addition, in the starting process, the overshoot temperature and the overshoot pressure of the system are high under the condition of non-uniform heat flow, the starting process is unstable, and the starting performance is attenuated.
Disclosure of Invention
The invention aims to provide a series-parallel loop two-phase thermosiphon which can effectively improve the unreasonable flow distribution of working media in a double evaporator, increase the heat transfer performance of a system and improve the starting performance of the system.
In order to solve the technical problem, the embodiment of the invention adopts the following technical scheme:
a series-parallel loop two-phase thermosiphon comprises a condenser, a gas-liquid separator, a first evaporator, a second evaporator, a liquid pipe, an air pipe and a first two-phase pipe; the first outlet of the condenser is connected with the inlet of the liquid pipe; the first outlet of the liquid pipe is connected with the inlet of the first evaporator, the outlet of the first evaporator is connected with the inlet of the gas-liquid separator, the first outlet of the gas-liquid separator is connected with the first inlet of the condenser through the air pipe, and the second outlet of the gas-liquid separator is connected with the inlet of the second evaporator; the second outlet of the liquid pipe is connected with the inlet of the second evaporator; the outlet of the second evaporator is connected to the first inlet of the condenser via a first two-phase tube.
As a preferred example, the series-parallel loop two-phase thermosiphon further includes a second two-phase tube, an outlet of the air tube and an outlet of the first two-phase tube are respectively connected to an inlet of the second two-phase tube, and an outlet of the second two-phase tube is connected to a first inlet of the condenser.
Preferably, when the first evaporator and the second evaporator operate, the heat flow density of the first evaporator is lower than that of the second evaporator.
As a preferred example, the condenser is a plate heat exchanger, a working medium flows in the condenser, and cooling water flows in the condenser in a reverse direction to cool the working medium.
Compared with the prior art, the series-parallel loop two-phase thermosiphon can effectively improve the unreasonable flow distribution of the working medium in the double evaporators, increase the heat transfer performance of the system and improve the starting performance of the system. Compared with a conventional parallel double-evaporator loop two-phase thermosiphon, the first evaporator and the second evaporator are connected in series-parallel by adding the gas-liquid separator in the loop two-phase thermosiphon. After the two-phase working medium at the outlet of the first evaporator is subjected to gas-liquid separation through the gas-liquid separator, on one hand, only the gaseous working medium flows upwards in the gas pipe, the gravity pressure drop of the gaseous working medium is reduced, so that the driving force required by the flowing of the working medium is reduced, and the starting performance of the system is improved to a certain extent; on the other hand, the liquid working medium at the outlet of the gas-liquid separator is mixed with the liquid working medium at the outlet of one branch of the liquid pipes and then enters the second evaporator, the flow of the working medium in the second evaporator is increased, so that the heat transfer performance is improved, the flow distribution of the working medium in the double evaporators is more reasonable, and the overall heat transfer performance of the system is effectively improved.
Drawings
FIG. 1 is a schematic view of an auxiliary series-parallel loop two-phase thermosiphon of a gas-liquid separator according to the present invention;
FIG. 2 is a schematic view of the structure of a gas-liquid separator according to the present invention.
The figure shows that: a first evaporator 101, a second evaporator 102, a condenser 103, a gas-liquid separator 104, a liquid pipe 105, a gas pipe 106, a first two-phase pipe 107, and a second two-phase pipe 108.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1 and 2, a serial-parallel loop two-phase thermosiphon according to an embodiment of the present invention includes a condenser 103, a gas-liquid separator 104, a first evaporator 101, a second evaporator 102, a liquid pipe 105, a gas pipe 106, and a first two-phase pipe 107. A first outlet of condenser 103 is connected to an inlet of liquid line 105. A first outlet of the liquid pipe 105 is connected to an inlet of the first evaporator 101, an outlet of the first evaporator 101 is connected to an inlet of the gas-liquid separator 104, a first outlet of the gas-liquid separator 104 is connected to a first inlet of the condenser 103 through the gas pipe 106, and a second outlet of the gas-liquid separator 104 is connected to an inlet of the second evaporator 102. A second outlet of the liquid pipe 105 is connected to an inlet of the second evaporator 102, and an outlet of the second evaporator 102 is connected to a first inlet of the condenser 103 through a first two-phase pipe 107.
In the above embodiment, the working fluid flowing out of the condenser 103 enters the liquid pipe 105 and flows out of the liquid pipe 105. The working medium flowing out of the liquid pipe 105 is divided into two branches: in the first branch, the working medium enters a first evaporator 101, an outlet of the first evaporator 101 is connected with an inlet of a gas-liquid separator 104, and a gaseous working medium outlet of the gas-liquid separator 104 is connected with an inlet of a gas pipe 106; an outlet of the air pipe 106 is connected with an outlet of the first two-phase pipe 107, and the working medium flowing out of the air pipe 106 and the working medium flowing out of the first two-phase pipe 107 are mixed and then enter the condenser 103; in the second branch, the working medium is mixed with the working medium flowing out from the liquid working medium outlet of the gas-liquid separator 104 and then enters the second evaporator 102; the outlet of the second evaporator 102 is connected to the inlet of the first two-phase pipe 107.
In the above embodiment, the first evaporator 101 and the second evaporator 102 are connected in series-parallel.
The gas-liquid separator 104 has one inlet and two outlets. The two-phase working medium is subjected to gas-liquid separation in the gas-liquid separator 104, the gas working medium enters the condenser 103 through the gas pipe 106, and the liquid working medium is mixed with the liquid working medium of one branch flowing out of the liquid pipe 105 and then enters the second evaporator 102.
As a preferable example, the series-parallel loop two-phase thermosiphon further includes a second two-phase pipe 108, an outlet of the gas pipe 106 and an outlet of the first two-phase pipe 107 are respectively connected to an inlet of the second two-phase pipe 108, and an outlet of the second two-phase pipe 108 is connected to a first inlet of the condenser 103.
Preferably, in operation, the first evaporator 101 and the second evaporator 102, the heat flow density of the first evaporator 101 is lower than that of the second evaporator 102. In operation, the first evaporator 101 and the second evaporator 102 may be heated by the heating blocks to provide different heat flux densities. Based on different heat flux densities of the first evaporator 101 and the second evaporator 102, the unevaporated liquid working medium in the first evaporator 101 enters the second evaporator 102 to be further evaporated, and the flow of the working medium in the second evaporator 102 is increased, so that the heat transfer performance of the second evaporator 102 is improved, the problem that the flow of the working medium in the double evaporators is not uniformly distributed under the condition of non-uniform heat flux density is solved, and the purpose of improving the overall performance of the system is achieved.
As a preferred example, the condenser 103 is a plate heat exchanger, a working medium flows in the condenser 103, and cooling water flows in the condenser 103 in a reverse direction to cool the working medium. The condenser 103 is provided with a second inlet and a second outlet, and cooling water enters the condenser 103 from the second inlet, absorbs heat of the working medium and flows out from the second outlet.
According to the embodiment, the heat flow density ratio of the first evaporator 101 to the second evaporator 102 can effectively adjust the flow of the working medium in the two evaporators, and the heat transfer performance and the starting performance of the system are improved. In the parallel double-evaporator loop two-phase thermosiphon, when the heat flux density ratio of the high-low heat flux density evaporator is up to 15 times, the flow ratio of the working medium in the double evaporator is only 1.67 times. On the basis, the heat transfer performance of the high heat flow density evaporator is greatly attenuated. By adopting the gas-liquid separator of the embodiment to assist the two-phase thermosiphon of the series-parallel loop, when the heat flow density ratio of the first evaporator 101 to the second evaporator 102 is 1:15, the flow ratio of the working medium in the first evaporator 101 to the second evaporator 102 can at least reach 1: 3. Therefore, by adopting the novel system, the flow of the working medium in the double evaporators can be effectively regulated, and the heat transfer performance of the whole system is improved.
This embodiment performs gas-liquid separation of the two-phase working fluid at the outlet of the low heat flow density evaporator (i.e., the first evaporator 101) by using a gas-liquid separator. On one hand, in the gas pipe 106, only the gaseous working medium flows upwards and enters the condenser 103, and compared with a two-phase working medium, the gravity pressure drop of the gaseous working medium flowing upwards in the gas pipe 106 is reduced, so that the driving force required by the gaseous working medium flowing upwards in the gas pipe 106 is reduced, and the starting performance of the system is effectively improved. On the other hand, in the second branch, part of the working medium flowing out of the condenser 103 and the liquid working medium flowing out of the gas-liquid separator 104 are mixed and then enter the high heat flow density evaporator (i.e. the second evaporator 102), the flow rate of the working medium in the second branch is increased, the heat transfer performance is increased, the flow rate distribution of the working medium in the double evaporators is more reasonable, and the overall heat transfer performance of the system is improved. The system has positive application value for the further development of a multi-heat-source loop two-phase thermosiphon technology (more evaporators are connected in series or in parallel into the system) and an information machine room cooling technology, and can bring better social benefit and economic benefit.
In the embodiment, the two-phase working medium of the low heat flow density evaporator (namely, the first evaporator 101) is separated by the gas-liquid separator, so that the flow rate of the working medium in the high heat flow density evaporator (namely, the second evaporator 102) is increased, and the total driving force required by starting the system is reduced. The embodiment can effectively improve the performance of the multi-heat-source loop two-phase thermosiphon.
The above description is only of the preferred embodiments of the present invention, and it should be noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the invention and these are intended to be within the scope of the invention.
Claims (4)
1. A series-parallel loop two-phase thermosiphon comprising a condenser (103), characterized in that: the system also comprises a gas-liquid separator (104), a first evaporator (101), a second evaporator (102), a liquid pipe (105), an air pipe (106) and a first two-phase pipe (107);
the first outlet of the condenser (103) is connected with the inlet of the liquid pipe (105); a first outlet of the liquid pipe (105) is connected with an inlet of the first evaporator (101), an outlet of the first evaporator (101) is connected with an inlet of the gas-liquid separator (104), a first outlet of the gas-liquid separator (104) is connected with a first inlet of the condenser (103) through the air pipe (106), and a second outlet of the gas-liquid separator (104) is connected with an inlet of the second evaporator (102);
the second outlet of the liquid pipe (105) is connected with the inlet of the second evaporator (102); the outlet of the second evaporator (102) is connected to the first inlet of the condenser (103) via a first two-phase pipe (107).
2. The series-parallel loop two-phase thermosiphon of claim 1, wherein: the condenser is characterized by further comprising a second two-phase pipe (108), wherein an outlet of the air pipe (106) and an outlet of the first two-phase pipe (107) are respectively connected with an inlet of the second two-phase pipe (108), and an outlet of the second two-phase pipe (108) is connected with a first inlet of the condenser (103).
3. The series-parallel loop two-phase thermosiphon of claim 1, wherein: when the first evaporator (101) and the second evaporator (102) work, the heat flow density of the first evaporator (101) is lower than that of the second evaporator (102).
4. The series-parallel loop two-phase thermosiphon of claim 1, wherein: the condenser (103) is a plate heat exchanger, a working medium flows in the condenser (103), and cooling water flows reversely in the condenser (103) to cool the working medium.
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| CN201910476186.0A CN110207519B (en) | 2019-06-03 | 2019-06-03 | Series-parallel loop two-phase thermosiphon |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000292016A (en) * | 1999-04-01 | 2000-10-20 | Bosch Automotive Systems Corp | Refrigerating cycle |
| CN1847749A (en) * | 2005-09-26 | 2006-10-18 | 浙江春晖智能控制股份有限公司 | Refrigerating system of automobile air conditioner |
| CN1896673A (en) * | 2006-06-20 | 2007-01-17 | 青岛大学 | Controllable bi-circulating hot-pipe system |
| CN102252446A (en) * | 2011-07-08 | 2011-11-23 | 浙江大学 | Ejector-based vortex pipe refrigeration system |
| CN106524635A (en) * | 2016-10-31 | 2017-03-22 | 天津大学 | Refrigerator with electromagnetic field assisted fresh keeping property |
| CN109269132A (en) * | 2018-07-16 | 2019-01-25 | 同济大学 | A kind of mixed working fluid compression circulatory system of carrying liqs boost-up circuit |
-
2019
- 2019-06-03 CN CN201910476186.0A patent/CN110207519B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000292016A (en) * | 1999-04-01 | 2000-10-20 | Bosch Automotive Systems Corp | Refrigerating cycle |
| CN1847749A (en) * | 2005-09-26 | 2006-10-18 | 浙江春晖智能控制股份有限公司 | Refrigerating system of automobile air conditioner |
| CN1896673A (en) * | 2006-06-20 | 2007-01-17 | 青岛大学 | Controllable bi-circulating hot-pipe system |
| CN102252446A (en) * | 2011-07-08 | 2011-11-23 | 浙江大学 | Ejector-based vortex pipe refrigeration system |
| CN106524635A (en) * | 2016-10-31 | 2017-03-22 | 天津大学 | Refrigerator with electromagnetic field assisted fresh keeping property |
| CN109269132A (en) * | 2018-07-16 | 2019-01-25 | 同济大学 | A kind of mixed working fluid compression circulatory system of carrying liqs boost-up circuit |
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