CN107356016B - Heat exchange unit with switchable evaporator and loop heat pipe - Google Patents
Heat exchange unit with switchable evaporator and loop heat pipe Download PDFInfo
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- CN107356016B CN107356016B CN201710437653.XA CN201710437653A CN107356016B CN 107356016 B CN107356016 B CN 107356016B CN 201710437653 A CN201710437653 A CN 201710437653A CN 107356016 B CN107356016 B CN 107356016B
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- heat exchanger
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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
- F25B39/00—Evaporators; Condensers
- F25B39/02—Evaporators
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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
- F25B39/00—Evaporators; Condensers
Abstract
The invention relates to a heat exchange unit with switchable evaporators and loop heat pipes, which comprises a main heat exchanger, a precooling heat exchanger and a reheating heat exchanger, wherein heat exchange fluid channels of the precooling heat exchanger, the main heat exchanger and the reheating heat exchanger are sequentially connected in series, refrigerant heat exchange channels of the precooling heat exchanger, the main heat exchanger and the reheating heat exchanger are communicated through refrigerant connecting pipes, and an independent evaporator mode or an evaporator and loop heat pipe combined mode is formed through refrigerant pipeline switching. Compared with the prior art, the invention can realize the conversion of the independent evaporator mode and the evaporator heating loop heat pipe combined mode under different conditions through four three-way valves, thereby reducing the unnecessary energy loss of the system.
Description
Technical Field
The invention relates to a heat exchange unit, in particular to a heat exchange unit with a switchable evaporator and loop heat pipes.
Background
The heat pipe is a novel heat transfer element, and the main principle is that the heat is quickly transferred by utilizing the phase change process of medium condensation at the cold end after the medium is evaporated at the hot end (namely, the latent heat of evaporation and the latent heat of condensation of liquid are utilized), and the heat conduction capability of the heat pipe exceeds the heat conduction capability of any known metal. The loop heat pipe is a high-efficiency phase-change heat transfer device, consists of an evaporator and a condenser, is connected into a loop through a gas-liquid transmission pipeline, transfers heat by utilizing the evaporation and condensation of working media, and can transfer a large amount of heat under the conditions of small temperature difference and long distance. Loop heat pipes are now the primary heat transfer element for aerospace thermal control systems and are also playing an increasingly important role in cooling systems for terrestrial electronics.
In a vapor compression refrigerating device, an evaporator evaporates by utilizing low pressure of a refrigerant to form low temperature, and the temperature of heat exchange fluid is reduced. The larger the evaporator area, the higher the evaporating pressure of the refrigeration system, and the higher the efficiency of the refrigeration cycle. When using the evaporimeter to carry out hot humid air processing, not only can realize the air cooling, can also make the moisture in the air condense when evaporimeter surface temperature is less than dew point temperature, realize the dehumidification function, and evaporating temperature is lower, and the effect of condensing is showing more.
In the practical application process, all heat exchange areas are required to be used as evaporators under certain conditions, so that the evaporation temperature is increased as much as possible, and the circulation efficiency is improved; under the condition of dehumidification and reheating, the condensation efficiency needs to be increased by using low evaporation temperature, and heat recovery is realized through reheating. For example, in a heat pump cycle of a heat pump clothes dryer, in order to improve the dehumidification effect, the evaporation temperature is generally low, and the air is first cooled and dehumidified and then heated, which brings unnecessary energy loss.
Disclosure of Invention
The present invention is directed to overcoming the above-mentioned deficiencies of the prior art by providing a heat exchange unit that is interchangeable between a stand-alone evaporator and an evaporator-plus-loop heat pipe combination.
The purpose of the invention can be realized by the following technical scheme: the utility model provides a changeable heat transfer unit of evaporimeter and loop heat pipe, this heat transfer unit includes main heat exchanger, precooling heat exchanger and reheat heat exchanger, precooling heat exchanger, main heat exchanger and reheat heat exchanger's heat transfer fluid passageway connects gradually in series, precooling heat exchanger, main heat exchanger and reheat heat exchanger's refrigerant heat transfer passageway passes through refrigerant connecting pipe UNICOM to form independent evaporimeter mode or evaporimeter heating loop heat pipe composite mode through the refrigerant pipeline switching.
Preferably, an inlet of the heat exchange fluid channel is arranged on the precooling heat exchanger, and an outlet of the heat exchange fluid channel is arranged on the reheating heat exchanger.
The fluid flowing in the heat exchange fluid channel is air, and the air is conveyed from the inlet of the heat exchange fluid channel to the outlet of the heat exchange fluid channel through the fan.
The refrigerant heat exchange channels are connected in the following sequence: a third port of the first three-way valve is connected with the end a of a refrigerant channel of the main heat exchanger; a second port of the first three-way valve is respectively connected with an a end of a refrigerant channel of the precooling heat exchanger and a third port of the third three-way valve; the refrigerant channel of the pre-cooling heat exchanger is connected with the first port of the second three-way valve, the second port of the second three-way valve is connected with the first port of the refrigerant channel of the main heat exchanger, the b port of the refrigerant channel of the main heat exchanger is respectively connected with the first port of the third three-way valve and the third port of the fourth three-way valve, the second port of the third three-way valve is connected with the a port of the refrigerant channel of the reheating heat exchanger, and the b port of the refrigerant channel of the reheating heat exchanger is respectively connected with the third port of the second three-way valve and the first inlet of the fourth three-way valve.
And a refrigerant pump is arranged on a connecting pipeline between the end b of the refrigerant channel of the reheating heat exchanger and the third port of the second three-way valve.
And under the independent evaporator mode, the third port of the first three-way valve, the third port of the second three-way valve, the third port of the third three-way valve and the third port of the fourth three-way valve are closed.
And under the evaporator heating loop heat pipe combination mode, the second port of the first three-way valve, the second port of the second three-way valve, the first port of the third three-way valve and the first port of the fourth three-way valve are closed.
The inlet of the refrigerant heat exchange channel is connected with the first port of the first three-way valve, the outlet of the refrigerant heat exchange channel is connected with the second port of the fourth three-way valve, and under the connection mode, the fluid flow in the refrigerant heat exchange channel and the air flow in the heat exchange fluid channel are in the same flow.
The inlet of the refrigerant heat exchange channel is connected with the second port of the fourth three-way valve, and the outlet of the refrigerant heat exchange channel is connected with the first port of the first three-way valve. In this connection, the fluid flow in the refrigerant heat exchange channels is countercurrent to the air flow in the heat exchange fluid channels.
The types of the precooling heat exchanger, the main heat exchanger and the reheating heat exchanger comprise a finned tube heat exchanger, a micro-channel heat exchanger, a plate heat exchanger, a shell-and-tube heat exchanger, a falling film heat exchanger and a double-tube heat exchanger.
The heat exchange unit has the following two working modes:
1. independent evaporator mode: the inlet of the heat exchange unit, the refrigerant channels of the precooling heat exchanger, the main heat exchanger and the reheating heat exchanger, and the outlet of the heat exchange unit are sequentially connected together through a connecting pipe and a three-way valve to form an independent evaporator. The heat exchange fluid sequentially passes through the precooling heat exchanger, the main heat exchanger and the reheating heat exchanger.
2. Evaporator heating loop heat pipe combination mode: the main heat exchanger is independently used as an evaporator, and a refrigerant channel of the main heat exchanger is connected with an inlet and an outlet of the heat exchange unit through a connecting pipe and a three-way valve; the pre-cooling heat exchanger, the reheating heat exchanger and the refrigerant pump are directly connected with each other through a connecting pipe and a three-way valve to form a loop heat pipe, the refrigerant is evaporated in the pre-cooling heat exchanger and enters the reheating heat exchanger, the refrigerant is condensed into liquid in the reheating heat exchanger, and the liquid refrigerant is conveyed to the pre-cooling heat exchanger through the refrigerant pump. The heat exchange fluid sequentially passes through the precooling heat exchanger, the main heat exchanger and the reheating heat exchanger.
Compared with the prior art, the invention has the beneficial effects that:
the conversion between the two modes of the independent evaporator and the evaporator heating loop heat pipe is realized by switching the refrigerant pipelines. The independent evaporator mode has the advantages that all heat exchange areas can be used as evaporators, evaporation temperature is increased as much as possible, and circulation efficiency is improved; the combined mode of the evaporator and the loop heat pipe has the advantages that under the condition of dehumidification and reheating, the condensation efficiency is increased by using low evaporation temperature, and precooling and reheating before and after the evaporator are realized through the combination of the loop heat pipe, so that unnecessary energy loss of a system is reduced.
Drawings
FIG. 1 is a schematic connection diagram of example 1;
FIG. 2 is a schematic view of the mode of the independent evaporator in embodiment 1;
FIG. 3 is a schematic view of the evaporator-heating loop heat pipe combination of embodiment 1;
FIG. 4 is a schematic connection diagram of embodiment 2.
Wherein, 1 is a precooling heat exchanger, and 11 is an a end of a refrigerant channel of the precooling heat exchanger; 12 is the b end of the refrigerant channel of the precooling heat exchanger; 2 as a main heat exchanger, 21 as an a-end of a refrigerant passage of the main heat exchanger, 22 as a b-end of the refrigerant passage of the main heat exchanger, 3 as a reheat heat exchanger, 31 as an a-end of the refrigerant passage of the reheat heat exchanger, 32 as a b-end of the refrigerant passage of the reheat heat exchanger, 4 as a three-way valve, 41 as a first port of a three-way valve, 42 as a second port of a three-way valve, 43 as a third port of a three-way valve, 5 as a second three-way valve, 51 as a first port of a second three-way valve, 52 as a second port of a two-way valve, 53 as a third port of a two-way valve, 6 as a third three-way valve, 61 as a first port of a three-way valve, 62 as a second port of a three-way valve, 63 as a third port of a three-way valve, 7 as a fourth three-way valve, 71 as a first port of a four-way valve, 72 as a second port of a four-way valve, 73 as a third port of a four-, 81 is a fan, 9 is a refrigerant pump, 101 is an inlet of a refrigerant heat exchange channel, and 102 is an outlet of the refrigerant heat exchange channel.
Detailed Description
The following examples are given for the detailed implementation and specific operation of the present invention, but the scope of the present invention is not limited to the following examples.
Example 1
The heat exchange unit with the switchable evaporator and loop heat pipe is structurally shown in figure 1 and comprises a main heat exchanger 2, a precooling heat exchanger 1 and a reheating heat exchanger 3, heat exchange fluid channels 8 of the precooling heat exchanger 1, the main heat exchanger 2 and the reheating heat exchanger 3 are sequentially connected, refrigerant heat exchange channels of the precooling heat exchanger 1, the main heat exchanger 2 and the reheating heat exchanger 3 form an independent evaporator mode or an evaporator and loop heat pipe combined mode, and the type of the precooling heat exchanger 1, the main heat exchanger 2 and the reheating heat exchanger 3 is a finned tube heat exchanger.
The inlet of the heat exchange fluid channel 8 is arranged on the precooling heat exchanger 1, and the outlet of the heat exchange fluid channel 8 is arranged on the reheating heat exchanger 3. The fluid flowing in the heat exchange fluid channel 8 is air, and the air is sent from the inlet of the heat exchange fluid channel 8 to the outlet of the heat exchange fluid channel 8 by the fan 81.
The connection sequence of the refrigerant heat exchange channels is as follows: the inlet 101 of the refrigerant heat exchange channel is connected with the first port 41 of the first three-way valve, and the outlet 102 of the refrigerant heat exchange channel is connected with the second port 72 of the fourth three-way valve, in such a way, the fluid flow in the refrigerant heat exchange channel and the air flow in the heat exchange fluid channel 8 are in concurrent flow. The third port 43 of the first three-way valve is connected with the a end 21 of the refrigerant channel of the main heat exchanger; the second port 42 of the first three-way valve is respectively connected with the a end 11 of the refrigerant channel of the precooling heat exchanger and the third port 63 of the third three-way valve; the b end 12 of the refrigerant channel of the precooling heat exchanger is connected with the first port 51 of the second three-way valve, the second port 52 of the second three-way valve is connected with the a end 21 of the refrigerant channel of the main heat exchanger, the b end 22 of the refrigerant channel of the main heat exchanger is respectively connected with the first port 61 of the third three-way valve and the third port 73 of the fourth three-way valve, the second port 62 of the third three-way valve is connected with the a end 31 of the refrigerant channel of the reheating heat exchanger, and the b end 32 of the refrigerant channel of the reheating heat exchanger is respectively connected with the third port 53 of the second three-way valve and the first inlet of the fourth three-way valve 7. A refrigerant pump 9 is arranged on a connecting pipeline between the b end 32 of the refrigerant channel of the reheating heat exchanger and the third port 53 of the second three-way valve.
The principle of the independent evaporator mode of the present embodiment is shown in fig. 2, in which the third port 43 of the first three-way valve, the third port 53 of the second three-way valve, the third port 63 of the third three-way valve, and the third port 73 of the fourth three-way valve are closed. At the moment, the heat exchange fluid sequentially passes through the precooling heat exchanger 1, the main heat exchanger 2 and the reheating heat exchanger 3, the heat exchange area is large, the evaporation temperature can be increased as much as possible, and the circulation efficiency is improved.
The principle of the evaporator heating loop heat pipe combination mode of the present embodiment is shown in fig. 3, in which port two 42 of the three-way valve one, port two 52 of the three-way valve two, port one 61 of the three-way valve three, and port one 71 of the three-way valve four are closed. The first three-way valve 4 enables the inlet 101 of the refrigerant heat exchange channel to be only connected with the a end 21 of the refrigerant channel of the main heat exchanger, the second three-way valve 5 enables the b end 12 of the refrigerant channel of the precooling heat exchanger to be only communicated with the b end 32 of the refrigerant channel of the reheating heat exchanger through the refrigerant pump 9, the third three-way valve 6 enables the a end 31 of the refrigerant channel of the reheating heat exchanger to be only communicated with the a end 11 of the refrigerant channel of the precooling heat exchanger, and the fourth three-way valve 7 enables the outlet 102 of the refrigerant heat exchange channel to be only communicated with the b end 22 of the refrigerant channel of the main. The refrigerant enters the heat exchange unit from the inlet 101 of the refrigerant heat exchange channel, directly enters the main heat exchanger 10 after passing through the first three-way valve 4, and then directly flows out of the heat exchange unit from the outlet 102 of the refrigerant heat exchange channel through the fourth three-way valve 7. In this case, the main heat exchanger is used alone as the evaporator of the system. Meanwhile, the precooling heat exchanger 1 and the reheating heat exchanger 3 are directly connected with the second three-way valve 5 and the third three-way valve 6 through connecting pipes to form a loop heat pipe. The precooling heat exchanger 1 is used as an evaporation end of the loop heat pipe, the reheating heat exchanger 3 is used as a condensation end of the loop heat pipe, liquid heat exchange fluid absorbs heat in the precooling heat exchanger 1 and becomes gaseous, enters the reheating heat exchanger 3 under the power of heat diffusion, is condensed to release heat, and then is conveyed back to the precooling heat exchanger 1 through the refrigerant pump 9, so that the circulation of the loop heat pipe is completed. At the moment, the heat exchange fluid firstly passes through the precooling heat exchanger 1 to realize precooling before the evaporator, then passes through the main heat exchanger 2 to realize further cooling and dehumidification, and finally passes through the reheating heat exchanger 3 to realize reheating, thereby reducing unnecessary energy loss of the system.
Example 2
The same connection method as that used in example 1 was used, except that: an inlet 101 of the refrigerant heat exchange channel is connected with a second port 72 of the fourth three-way valve, and an outlet 102 of the refrigerant heat exchange channel is connected with a first port of the first three-way valve, as shown in fig. 4.
Compared with embodiment 1, the refrigerant channel connection sequence of only the pre-cooling heat exchanger 1, the main heat exchanger 2 and the reheating heat exchanger 3 is changed, and the function is not changed.
Claims (6)
1. A heat exchange unit with switchable evaporators and loop heat pipes is characterized by comprising a main heat exchanger, a precooling heat exchanger and a reheating heat exchanger, wherein heat exchange fluid channels of the precooling heat exchanger, the main heat exchanger and the reheating heat exchanger are sequentially connected in series, refrigerant heat exchange channels of the precooling heat exchanger, the main heat exchanger and the reheating heat exchanger are communicated through refrigerant connecting pipes, and an independent evaporator mode or an evaporator and loop heat pipe combined mode is formed through refrigerant pipeline switching;
the inlet of the heat exchange fluid channel is arranged on the precooling heat exchanger, and the outlet of the heat exchange fluid channel is arranged on the reheating heat exchanger; the refrigerant heat exchange channels are connected in the following sequence: a third port of the first three-way valve is connected with the end a of a refrigerant channel of the main heat exchanger; a second port of the first three-way valve is respectively connected with an a end of a refrigerant channel of the precooling heat exchanger and a third port of the third three-way valve; the b end of a refrigerant channel of the precooling heat exchanger is connected with a first port of a second three-way valve, the second port of the second three-way valve is connected with an a end of the refrigerant channel of the main heat exchanger, the b end of the refrigerant channel of the main heat exchanger is respectively connected with a first port of a third three-way valve and a third port of a fourth three-way valve, the second port of the third three-way valve is connected with an a end of the refrigerant channel of the reheating heat exchanger, and the b end of the refrigerant channel of the reheating heat exchanger is respectively connected with a third port of the second three-way valve and a first inlet of the fourth three-way valve;
a refrigerant pump is arranged on a connecting pipeline between the end b of the refrigerant channel of the reheating heat exchanger and the third port of the second three-way valve;
and under the independent evaporator mode, the third port of the first three-way valve, the third port of the second three-way valve, the third port of the third three-way valve and the third port of the fourth three-way valve are closed.
2. A heat exchange unit with a switchable evaporator and a loop heat pipe as claimed in claim 1, wherein the fluid flowing in the heat exchange fluid channel is air, and the air is sent from the inlet of the heat exchange fluid channel to the outlet of the heat exchange fluid channel by a fan.
3. An evaporator and loop heat pipe switchable heat exchange unit according to claim 1, wherein in the evaporator and loop heat pipe combination mode, the second port of the first three-way valve, the second port of the second three-way valve, the first port of the third three-way valve and the first port of the fourth three-way valve are closed.
4. The heat exchange unit switchable between the evaporator and the loop heat pipe as claimed in claim 1, wherein an inlet of the refrigerant heat exchange channel is connected with a first port of a first three-way valve, and an outlet of the refrigerant heat exchange channel is connected with a second port of a fourth three-way valve.
5. The heat exchange unit switchable between the evaporator and the loop heat pipe as claimed in claim 1, wherein an inlet of the refrigerant heat exchange channel is connected with a second port of a fourth three-way valve, and an outlet of the refrigerant heat exchange channel is connected with a first port of a first three-way valve.
6. The switchable evaporator and loop heat pipe heat exchange unit of claim 1, wherein the types of the pre-cooling heat exchanger, the main heat exchanger and the reheating heat exchanger comprise a finned tube heat exchanger, a microchannel heat exchanger, a plate heat exchanger, a shell-and-tube heat exchanger, a falling film heat exchanger or a double tube heat exchanger.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201710437653.XA CN107356016B (en) | 2017-06-12 | 2017-06-12 | Heat exchange unit with switchable evaporator and loop heat pipe |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710437653.XA CN107356016B (en) | 2017-06-12 | 2017-06-12 | Heat exchange unit with switchable evaporator and loop heat pipe |
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| CN107356016A CN107356016A (en) | 2017-11-17 |
| CN107356016B true CN107356016B (en) | 2020-06-26 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109990262B (en) * | 2018-03-09 | 2020-12-04 | 浙江伊鑫纺织科技股份有限公司 | Auxiliary heating steam generator |
| US10962303B2 (en) * | 2019-03-01 | 2021-03-30 | Mitek Holdings, Inc. | Heat exchanger |
| CN112902708B (en) * | 2021-02-08 | 2022-06-14 | 南京慧和建筑技术有限公司 | Multi-stage temperature control method for humidifying water and humidifying method |
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