CN107101420B - Heat exchange device suitable for low-pressure refrigerant - Google Patents
Heat exchange device suitable for low-pressure refrigerant Download PDFInfo
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- CN107101420B CN107101420B CN201610095118.6A CN201610095118A CN107101420B CN 107101420 B CN107101420 B CN 107101420B CN 201610095118 A CN201610095118 A CN 201610095118A CN 107101420 B CN107101420 B CN 107101420B
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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
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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
- F25B2339/00—Details of evaporators; Details of condensers
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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
- F25B2500/00—Problems to be solved
- F25B2500/09—Improving heat transfers
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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
- F25B2500/00—Problems to be solved
- F25B2500/24—Low amount of refrigerant in the system
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Abstract
The invention discloses a heat exchange device suitable for a low-pressure refrigerant, which comprises a first heat exchange unit and a second heat exchange unit, wherein a refrigerant outlet of the first heat exchange unit is communicated with a refrigerant inlet of the second heat exchange unit through a throttling device, a condensing tube bundle is arranged in the first heat exchange unit, a refrigerant distributor is arranged in a cylinder of the second heat exchange unit along the axial direction of the cylinder, the condensing tube bundle is arranged at the upper part of the refrigerant distributor, and a falling film evaporation tube bundle is arranged at the lower part of the refrigerant distributor. The heat exchange device suitable for the low-pressure refrigerant overcomes the defects of a refrigerant distributor in the traditional falling film evaporator, can be suitable for a system adopting the low-pressure refrigerant, and has the advantages of simple structure, high heat transfer efficiency, small refrigerant charge amount and the like.
Description
Technical Field
The invention relates to the technical field of refrigeration, in particular to a heat exchange device suitable for a low-pressure refrigerant.
Background
The falling film evaporator has been applied to more and more refrigerating and air conditioning units due to the characteristics of higher heat transfer efficiency, less refrigerant charge amount and the like. Falling film evaporators generally employ the configuration shown in fig. 1, which includes an evaporator return tube 52, a liquid inlet tube 51, a refrigerant distributor 50, and an evaporator tube bundle 53. The gas-liquid two-phase refrigerant enters the evaporator through the liquid inlet pipe 51, the refrigerant drops on the evaporation tube bundle 53 after passing through the refrigerant distributor 50, and after heat exchange, the evaporated refrigerant gas is discharged through the evaporator air return pipe 52 and enters the compressor. The refrigerant distributor 50 of figure 1 is a critical component in a falling film evaporator and generally requires a sufficient pressure differential between the inside and outside of the refrigerant distributor to achieve uniform distribution of refrigerant to the evaporator tube bundle. For example, in a refrigeration unit using a medium-high pressure refrigerant (e.g., R134 a), the pressure difference between the inside and the outside of the refrigerant distributor is usually 150 to 300kPa.
With the development of air conditioning technology, the low-pressure refrigerant R1233zd (E) has received more and more attention from the refrigeration and air conditioning industry due to its advantages of environmental protection, high efficiency, etc., and table 1 shows that, under a typical refrigeration condition (evaporation temperature 5 ℃, condensation temperature 36.7 ℃), the difference between the evaporation pressure and the condensation pressure of R1233zd (E) is only 23.1% of that of R134a, compared with the evaporation pressure and the condensation pressure of R134 a. For low pressure refrigerants such as R1233zd (E), the refrigerant distributor in the conventional falling film evaporator is apparently not satisfactory.
TABLE 1 typical refrigeration conditions
Therefore, there is a need for a heat exchange apparatus that more efficiently and uniformly distributes refrigerant to heat exchange tubes, suitable for use in low pressure refrigerant environments.
Disclosure of Invention
The invention aims to provide a heat exchange device suitable for low-pressure refrigerants, overcomes the defects of a refrigerant distributor in a traditional falling film evaporator, and well solves the problem of refrigerant distribution of the evaporator of the low-pressure refrigerants.
In one aspect, the invention provides a heat exchange device suitable for a low-pressure refrigerant, which comprises a first heat exchange unit and a second heat exchange unit, wherein a refrigerant outlet of the first heat exchange unit is communicated with a refrigerant inlet of the second heat exchange unit through a throttling device, a condensation tube bundle is arranged in the first heat exchange unit, a refrigerant distributor is arranged in a cylinder of the second heat exchange unit along the axial direction of the cylinder, the condensation tube bundle is arranged at the upper part of the refrigerant distributor, and a falling film evaporation tube bundle is arranged at the lower part of the refrigerant distributor.
In one embodiment, said heat exchange apparatus, said first heat exchange unit comprises a first heat exchange unit refrigerant inlet pipe and a first heat exchange unit refrigerant outlet pipe; and a second heat exchange unit refrigerant inlet pipe and a second heat exchange unit refrigerant outlet pipe are arranged on the second heat exchange unit.
In one embodiment, the heat exchange device, the condensing tube bundle of the first heat exchange unit and the refrigerant inlet pipe of the first heat exchange unit are provided with impingement baffles; and an impingement plate is arranged between the condensation tube bundle of the second heat exchange unit and the refrigerant inlet pipe of the second heat exchange unit.
In one embodiment, in the heat exchange device, a liquid return baffle is arranged in the cylinder of the second heat exchange unit, the cylinder is divided into a pipe distribution chamber and a gas return chamber along the axial direction of the cylinder, the refrigerant outlet pipe of the second heat exchange unit is communicated with the gas return chamber, and the refrigerant inlet pipe of the second heat exchange unit is communicated with the pipe distribution chamber.
In one embodiment, the first heat exchange unit further includes a tube plate, a front water tank and a rear water tank disposed at two ends of the cylinder of the first heat exchange unit, the front water tank is provided with a water inlet tube and a cooling water outlet tube, and a split-range partition is disposed inside the front water tank to separate the water inlet tube from the cooling water outlet tube.
In an embodiment, heat transfer device, second heat transfer unit still contains tube sheet, preceding water tank and the back water tank that sets up at second heat transfer unit barrel both ends, be provided with inlet tube, refrigerated water inlet tube and refrigerated water outlet pipe on the preceding water tank, the inlet tube with be provided with the preceding water tank baffle that prevents cooling water and refrigerated water intermixture between the refrigerated water outlet pipe, the refrigerated water inlet tube with be provided with the journey baffle between the refrigerated water outlet pipe, be provided with the back water tank baffle that prevents cooling water and refrigerated water intermixture in the back water tank.
In one embodiment, in the heat exchange device, the water inlet pipe of the second heat exchange unit is communicated with the water inlet pipe of the first heat exchange unit through a pipeline, and the rear water tank of the second heat exchange unit is further provided with a cooling water return pipe communicated with the rear water tank of the first heat exchange unit.
In another aspect, the present invention provides a method of using the heat exchange device described above, the method comprising:
refrigerant gas is discharged from a gas outlet of the compressor and enters the first heat exchange unit through a refrigerant inlet of the first heat exchange unit;
after passing through the condensation pipe of the first heat exchange unit, the refrigerant is condensed into high-pressure liquid, and flows out of the refrigerant outlet of the first heat exchange unit and enters the connecting pipeline;
the high-pressure liquid refrigerant passes through the throttling device and then is changed into a medium-pressure two-phase refrigerant;
the medium-pressure two-phase refrigerant enters the interior of the second heat exchange unit through the refrigerant inlet of the second heat exchange unit;
the medium-pressure two-phase refrigerant is condensed by a condensing tube bundle at the upper part in the second heat exchange unit and then is changed into medium-pressure saturated liquid;
the medium-pressure saturated liquid uniformly falls onto the refrigerant distributor from the condensing tube bundle and is throttled again by the refrigerant distributor to become low-pressure two-phase refrigerant;
and after throttling and pressure reduction, the low-pressure two-phase refrigerant uniformly drops onto the falling film tube bundle at the lower part of the second heat exchange unit to be evaporated and then becomes low-pressure refrigerant gas, and the low-pressure refrigerant gas returns to the air suction port of the compressor through the air return pipe on the second heat exchange unit.
The invention includes any combination of any one or more of the embodiments described above.
The invention provides a double-tube bundle heat exchange device suitable for low-pressure refrigerants, which has the advantages of simple structure, high heat transfer efficiency, small refrigerant filling amount and the like.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention, as claimed.
Drawings
Further objects, features and advantages of the invention will become apparent from the following description of embodiments of the invention, with reference to the accompanying drawings, in which:
figure 1 shows a schematic diagram of a conventional falling film evaporator;
FIG. 2 is a schematic view of a heat exchange apparatus;
FIG. 3 is a schematic diagram of a water circulation loop of a two-flow process according to an embodiment;
FIG. 4 shows a diagram of a refrigeration cycle logP-h of a heat exchange device according to an embodiment;
FIG. 5 is a schematic diagram showing the structure of a two-stage water circulation loop in accordance with the second embodiment;
FIG. 6 is a graph showing the refrigeration cycle logP-h of the second heat exchange device of the embodiment.
Detailed Description
The objects and functions of the invention and methods for accomplishing the same will be apparent by reference to the exemplary embodiments. However, the invention is not limited to the exemplary embodiments disclosed below; it can be implemented in various forms. The nature of the description is merely to facilitate a comprehensive understanding of the invention by a person skilled in the relevant art.
Hereinafter, embodiments of the invention will be described with reference to the drawings. In the drawings, the same reference numerals denote the same or similar parts, or the same or similar steps.
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
The schematic structural diagram of the heat exchange device suitable for the low-pressure refrigerant provided by the invention is shown in fig. 2, and the heat exchange device comprises a first heat exchange unit 16, a throttling device 6, a connecting pipeline 17 and a second heat exchange unit 18. The first heat exchange unit 16 comprises a cylinder 1, and a first heat exchange unit refrigerant inlet 2 and a first heat exchange unit refrigerant outlet 3 are arranged on the cylinder 1. The barrel 1 is internally provided with a baffle 4 and a condensation tube bundle 5. The second heat exchange unit 18 comprises a cylinder 7, and a second heat exchange unit refrigerant inlet 8 and a second heat exchange unit refrigerant outlet 9 are arranged on the cylinder 7. The cylinder 7 is internally provided with a baffle 11, a liquid baffle 12 and a refrigerant distributor 14. The liquid baffle 12 divides the interior of the cylinder body into a gas return cavity 15 and a pipe distribution cavity 19 along the axial direction of the cylinder body 7, the gas return cavity 15 is communicated with the pipe distribution cavity 19 through an opening 20 arranged at the lower part of the liquid baffle 12, a second heat exchange unit refrigerant inlet 8 is communicated with the pipe distribution cavity 19, and a second heat exchange unit refrigerant outlet 9 is communicated with the gas return cavity 15. The refrigerant distributor 14 is arranged in the pipe distribution cavity 19 and divides the pipe distribution cavity into an upper part and a lower part along the axial direction of the cylinder 7, and the refrigerant distributor is provided with the condensing pipe bundle 10 on the upper part; the lower part is arranged with a falling film evaporator tube bundle 13. The throttling device 6 is arranged between the first heat exchange unit 16 and the second heat exchange unit 18 and is connected through a pipeline 17.
The first embodiment is as follows:
fig. 3 is a schematic structural diagram of a two-flow water circulation loop according to the first embodiment. As shown in fig. 3, the first heat exchange unit 16 further comprises tube plates 21, a front water tank 22 and a rear water tank 23 disposed at both ends of the first heat exchange unit cylinder 1. The front water tank 22 is provided with a water inlet pipe 24 and a cooling water outlet pipe 25. A split-level partition 34 is arranged in the front water tank to separate the water inlet pipe 24 from the cooling water outlet pipe 25.
As shown in fig. 3, the second heat exchange unit 18 further includes a tube plate 30, a front header 31 and a rear header 32 provided at both ends of the second heat exchange unit cylinder 7. The front water tank 31 is provided with a water inlet pipe 26, a chilled water inlet pipe 27 and a chilled water outlet pipe 28. The inlet pipe 26 communicates with the inlet pipe 24 of the first heat exchange unit 16 through a pipe 38 and communicates with the cooling water inlet pipe 29. A partition 35 is provided between the inlet pipe 26 and the chilled water outlet pipe 28 to prevent the cooling water and the chilled water from being mixed with each other. A split-range partition plate 36 is arranged between the chilled water inlet pipe 27 and the chilled water outlet pipe 28. A partition 37 is provided in the rear water tank 32, and functions in the same manner as the partition 35. The rear water tank 32 is further provided with a cooling water return pipe 33 and is communicated with the rear water tank 23 of the first heat exchange unit 16.
When the heat exchanger works, cooling water is divided into two paths by the cooling water inlet pipe 29 through the pipeline 38, the first path of cooling water enters the first flow heat exchange pipe of the first heat exchange unit condensation pipe bundle 5 through the first heat exchange unit water inlet pipe 24, and enters the first heat exchange unit rear water tank 23 after forced flowing heat exchange in the pipe; the second path of cooling water enters the second heat exchange unit condensation tube bundle 10 through the second heat exchange unit water inlet pipe 26, enters the second heat exchange unit rear water tank 32 after forced flowing heat exchange in the pipe, then enters the first heat exchange unit rear water tank 23 through the second heat exchange unit water return pipe 33, is mixed with the first path of cooling water in the first heat exchange unit rear water tank 23, enters the second flow path heat exchange pipe of the first heat exchange unit condensation tube bundle 5, enters the front water tank 22 of the first heat exchange unit 16 after forced flowing heat exchange in the pipe, and then is discharged through the cooling water outlet pipe 34. The chilled water enters the front water tank 31 of the second heat exchange unit through the chilled water inlet pipe 27, then enters the first flow heat exchange pipe of the falling film evaporation pipe bundle 13, enters the rear water tank 32 of the second heat exchange unit after forced flow heat exchange in the pipe, then enters the second flow heat exchange pipe of the falling film evaporation pipe bundle 13, enters the front water tank 31 of the second heat exchange unit after forced flow heat exchange, and is discharged through the chilled water outlet pipe 28.
As shown in fig. 2, fig. 3 and fig. 4, the first heat exchange unit 16 is a condenser, when the refrigerating unit works, the high-temperature and high-pressure gaseous refrigerant is discharged from the exhaust port of the compressor and enters the inside of the cylinder 1 of the first heat exchange unit through the refrigerant inlet 2 of the first heat exchange unit, and the baffle 4 in the cylinder 1 can prevent the direct impact of the gas on the condenser tube bundle 5. After flowing through the condensation tube bundle 5 and exchanging heat with the cooling water in the tube, the refrigerant is condensed into high-pressure liquid, flows out from the refrigerant outlet 3 of the refrigerant first heat exchange unit, and enters the connecting pipeline 17. The high-pressure liquid refrigerant is throttled by the throttling device 6 and then becomes a medium-pressure two-phase refrigerant, and the refrigerant pressure difference between the front and rear of the throttling device is DP1= Pc-P1. The medium-pressure two-phase refrigerant enters the second heat exchange unit cylinder 7 through the second heat exchange unit refrigerant inlet 8, and the impact of the medium-pressure two-phase refrigerant on the condensing tube bundle 10 can be prevented by the baffle 11 in the second heat exchange unit cylinder 7. A cavity is provided between the condenser tube bundle 10 and the refrigerant inlet 8 to facilitate uniform diffusion of the refrigerant gas onto the condenser tube bundle 10. The medium pressure two phase refrigerant flowing through the condenser tube bundle 10 condenses to become a medium pressure saturated liquid that falls uniformly onto the refrigerant distributor 14. The enthalpy difference between the refrigerant flowing through the condenser tube bundle 10 is DH = h1' -h1, which is the increased system cooling capacity using the condenser tube bundle 10. The medium-pressure saturated refrigerant is throttled and depressurized again through the refrigerant distributor 14 to become a low-pressure two-phase refrigerant, and the low-pressure two-phase refrigerant is uniformly dropped on the falling film tube bundle 13 at the lower part of the second heat exchange unit 18 to be evaporated to become a low-temperature low-pressure gaseous refrigerant, enters the air return cavity 15 through the opening 20, and then returns to the air suction port of the compressor through the air return pipe 9 of the second heat exchange unit. The liquid baffle 12 can prevent the refrigerant liquid from being sucked into the second heat exchange unit return pipe 9 with the gas. The pressure difference across the refrigerant distributor is DP2= P1-Pe.
Example two:
fig. 5 is a schematic diagram of the structure of the two-flow water circulation loop of the second embodiment. As shown in fig. 5, the first heat exchange unit 16 further includes tube plates 21 disposed at both axial ends of the first heat exchange unit cylinder 1, and a front water tank 22 and a rear water tank 23. The front water tank 22 is provided with a water inlet pipe 24 and a cooling water outlet pipe 25. A split-level partition 34 is arranged in the front water tank to separate the water inlet pipe 24 from the cooling water outlet pipe 25.
As shown in fig. 5, the second heat exchange unit 18 further includes tube plates 30 disposed at both axial ends of the second heat exchange unit cylinder 7, and a front water tank 31 and a rear water tank 32. The front water tank 31 is provided with two branch water inlet pipes 39 and a chilled water outlet pipe 28. The two branch water inlet pipes 39 are communicated through a pipeline 38 and are communicated with a main chilled water inlet pipe 40. A partition 35 is provided between one of the water inlet pipes 39 and the chilled water outlet pipe 28 to prevent the cooling water and the chilled water from being mixed with each other. A partition plate 36 is arranged between the other water inlet pipe 39 and the chilled water outlet pipe 28.
When the refrigerating unit works, the chilled water is divided into two paths through a pipeline 38 by a chilled water inlet pipe 40, the first path of chilled water enters a water inlet pipe 39 of a second heat exchange unit, enters heat exchange pipes of a condensing pipe bundle 10 of the second heat exchange unit, and enters a rear water tank 32 of the second heat exchange unit after forced flowing heat exchange in the pipes; the second path of chilled water enters the first flow heat exchange tube of the falling film tube bundle 13 of the second heat exchange unit through the branch water inlet tube 39 of the other second heat exchange unit, enters the rear water tank 32 of the second heat exchange unit after forced flow heat exchange in the tube, is mixed with the first path of chilled water in the rear water tank 32 of the second heat exchange unit, enters the second flow heat exchange tube of the falling film tube bundle 13 of the second heat exchange unit, enters the front water tank 31 of the second heat exchange unit 18 after forced flow heat exchange in the tube, and is discharged through the chilled water outlet tube 28. The cooling water enters the first heat exchange unit front water tank 22 through the cooling water inlet pipe 24, then enters the first flow heat exchange pipe of the condensation tube bundle 5 of the first heat exchange unit 16, enters the first heat exchange unit rear water tank 23 after forced flowing heat exchange in the pipe, then enters the second flow heat exchange pipe of the condensation tube bundle 5 of the first heat exchange unit 16, enters the first heat exchange unit front water tank 22 after forced flowing heat exchange, and is discharged through the cooling water outlet pipe 25.
As shown in fig. 2, 5 and 6, the first heat exchange unit 16 is a condenser, and when the refrigeration unit works, after the high-temperature and high-pressure gaseous refrigerant is discharged from the exhaust port of the compressor, the high-temperature and high-pressure gaseous refrigerant enters the inside of the cylinder 1 of the first heat exchange unit through the refrigerant inlet 2 of the first heat exchange unit, and the baffle 4 in the cylinder 1 can prevent the direct impact of the gas on the condensation tube bundle 5. The refrigerant flows through the condensation tube bundle 5 and exchanges heat with cooling water in the tube, is condensed into high-pressure liquid, flows out from the refrigerant outlet 3 of the refrigerant first heat exchange unit, and enters the connecting pipeline 17. The high-pressure liquid refrigerant is throttled by the throttling device 6 and becomes a medium-pressure two-phase refrigerant, and the refrigerant pressure difference between the front and rear of the throttling device is DP1_2= pc-P1_2. The medium-pressure two-phase refrigerant enters the second heat exchange unit cylinder 7 through the second heat exchange unit refrigerant inlet 8, and the impact of the medium-pressure two-phase refrigerant on the condensing tube bundle 10 can be prevented by the baffle 11 in the second heat exchange unit cylinder 7. After passing through the condensing tube bundle 10 at the upper part of the second heat exchange unit 18, the medium-pressure two-phase refrigerant is condensed and changed into medium-pressure saturated liquid, and the enthalpy difference of the refrigerant passing through the condensing tube bundle 10 is DH _2= h1' -h1_2. The medium pressure saturated liquid falls uniformly from the condenser tube bundle 10 onto the refrigerant distributor 14, throttled again by the refrigerant distributor to become a low pressure two-phase refrigerant, with a pressure difference DP2_2= p1_2-Pe across the refrigerant distributor. The low-pressure two-phase refrigerant flowing through the refrigerant distributor 14 uniformly drops onto the falling film tube bundle 13 at the lower part of the first heat exchange unit for evaporation to become low-temperature low-pressure gaseous refrigerant, enters the air return cavity through the opening 20, and then returns to the air suction port of the compressor through the air return pipe 9 of the second heat exchange unit. The liquid baffle 12 prevents refrigerant liquid from being sucked into the second heat exchange unit return pipe 9 with the gas.
The two-phase embodiment is relatively simple compared to the one-water embodiment, and the refrigerant pressure difference between the front and rear of the throttling device is DP1_2, which is advantageous for system regulation, because the chilled water flows in the condensing tube bundle 10 in the second heat exchange unit 18 and the temperature is lower. At the same time, the enthalpy difference DH _2 of the refrigerant flowing through the condensing tube bundle 10 is larger, thereby increasing the cooling capacity of the system.
Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.
Claims (30)
1. A heat exchange device suitable for low-pressure refrigerants comprises a first heat exchange unit and a second heat exchange unit, wherein a refrigerant outlet of the first heat exchange unit is communicated with a refrigerant inlet of the second heat exchange unit through a throttling device, a condensation tube bundle is arranged in the first heat exchange unit, a liquid baffle plate and a refrigerant distributor are arranged in a cylinder of the second heat exchange unit, the liquid baffle plate extends along the axial direction of the cylinder of the second heat exchange unit to form a tube distribution cavity and a gas return cavity, the refrigerant distributor is arranged in the tube distribution cavity, the refrigerant distributor extends from the liquid baffle plate towards the inner surface of the cylinder of the second heat exchange unit and extends along the axial direction of the cylinder of the second heat exchange unit to form an upper portion and a lower portion of the tube distribution cavity, the upper portion of the tube distribution cavity is provided with the condensation tube bundle, and the lower portion of the tube distribution cavity is provided with the falling film evaporation tube bundle.
2. The heat exchange device of claim 1, wherein the first heat exchange unit comprises a first heat exchange unit refrigerant inlet pipe and a first heat exchange unit refrigerant outlet pipe; and a second heat exchange unit refrigerant inlet pipe and a second heat exchange unit refrigerant outlet pipe are arranged on the second heat exchange unit.
3. The heat exchange device of claim 2, wherein an impingement plate is disposed between the condenser tube bundle of the first heat exchange unit and the refrigerant inlet pipe of the first heat exchange unit; and an impingement plate is arranged between the condensation tube bundle of the second heat exchange unit and the refrigerant inlet pipe of the second heat exchange unit.
4. The heat exchange device according to claim 2, wherein the second heat exchange unit refrigerant outlet pipe is communicated with the gas return cavity, and the second heat exchange unit refrigerant inlet pipe is communicated with the pipe distribution cavity.
5. The heat exchange device according to claim 1, wherein the first heat exchange unit further comprises a tube plate, a front water tank and a rear water tank which are arranged at two ends of the cylinder of the first heat exchange unit, the front water tank is provided with a water inlet pipe and a cooling water outlet pipe, and a split-level partition plate is arranged inside the front water tank to separate the water inlet pipe from the cooling water outlet pipe.
6. The heat exchange device according to claim 5, wherein the second heat exchange unit further comprises a tube plate, a front water tank and a rear water tank which are arranged at two ends of the cylinder of the second heat exchange unit, the front water tank of the second heat exchange unit is provided with a water inlet tube, a chilled water inlet tube and a chilled water outlet tube, a front water tank partition plate for preventing cooling water and chilled water from being mixed with each other is arranged between the water inlet tube and the chilled water outlet tube of the second heat exchange unit, a split partition plate is arranged between the chilled water inlet tube and the chilled water outlet tube of the second heat exchange unit, and a rear water tank partition plate for preventing cooling water and chilled water from being mixed with each other is arranged in the rear water tank of the second heat exchange unit.
7. The heat exchange device of claim 6, wherein the water inlet pipe of the second heat exchange unit is communicated with the water inlet pipe of the first heat exchange unit through a pipeline, and the rear water tank of the second heat exchange unit is further provided with a cooling water return pipe communicated with the rear water tank of the first heat exchange unit.
8. A method of using the heat exchange device of any one of claims 1-7, comprising:
after being discharged from a compressor exhaust port, the refrigerant gas enters the first heat exchange unit through a refrigerant inlet of the first heat exchange unit;
after passing through a condensation pipe of the first heat exchange unit, the refrigerant is condensed into high-pressure liquid, and flows out of a refrigerant outlet of the first heat exchange unit and enters a connecting pipeline;
the high-pressure liquid refrigerant passes through the throttling device and then is changed into a medium-pressure two-phase refrigerant;
the medium-pressure two-phase refrigerant enters the second heat exchange unit through a refrigerant inlet of the second heat exchange unit;
the medium-pressure two-phase refrigerant is condensed by a condensing tube bundle at the upper part in the second heat exchange unit and then is changed into medium-pressure saturated liquid;
the medium-pressure saturated liquid uniformly drops onto the refrigerant distributor through the condensing tube bundle, and is throttled again to become low-pressure two-phase refrigerant through the refrigerant distributor;
and after throttling and pressure reduction, the low-pressure two-phase refrigerant uniformly drops onto the falling film tube bundle at the lower part of the second heat exchange unit to be evaporated and then is changed into low-pressure refrigerant gas, and the low-pressure refrigerant gas returns to the air suction port of the compressor through the air return pipe on the second heat exchange unit.
9. A heat exchange apparatus for a low pressure refrigerant comprising:
a first heat exchange unit comprising a first condenser tube bundle disposed within a first barrel of the first heat exchange unit;
a second heat exchange unit comprising a refrigerant distributor disposed within a second barrel of the second heat exchange unit, wherein a first outlet of refrigerant of the first heat exchange unit and a first inlet of refrigerant of the second heat exchange unit are in fluid communication through a throttling device, the refrigerant distributor extending in an axial direction of the second barrel to form a cavity within the second barrel, the cavity comprising an upper portion and a lower portion, a second condenser tube bundle being disposed in the upper portion of the cavity and an evaporator tube bundle being disposed in the lower portion of the cavity.
10. The heat exchange device of claim 9, wherein the first heat exchange unit comprises a refrigerant second inlet and the refrigerant first outlet, and wherein the second heat exchange unit comprises the refrigerant first inlet and a refrigerant second outlet.
11. The heat exchange device of claim 10, comprising a first baffle disposed between the first condenser tube bank of the first heat exchange unit and the refrigerant second inlet and a second baffle disposed between the second condenser tube bank of the second heat exchange unit and the refrigerant first inlet.
12. The heat exchange device of claim 10, comprising a gas return liquid baffle disposed within the second cylinder of the second heat exchange unit, wherein the gas return liquid baffle divides the second cylinder into the chamber and a gas return cavity in an axial direction of the second cylinder, wherein the refrigerant second outlet and the gas return cavity are in fluid communication, and wherein the refrigerant first inlet and the chamber are in fluid communication.
13. The heat exchange device of claim 9, wherein the first heat exchange unit comprises a first tube sheet, a first front header and a first rear header disposed at a first end of the first cylinder of the first heat exchange unit, wherein the first front header has a first inlet tube and a first cooling water outlet tube, and wherein a first dividing partition is disposed within the first front header to separate the first cooling water outlet tube from the first inlet tube.
14. The heat exchange device of claim 13, wherein the second heat exchange unit comprises a second tube plate, a second front water tank and a second rear water tank disposed at the second end of the second cylinder of the second heat exchange unit, wherein the second front water tank has a second water inlet tube, a chilled water inlet tube and a chilled water outlet tube, wherein a front water tank separator for preventing cooling water and chilled water from being mixed with each other is disposed between the second water inlet tube and the chilled water outlet tube, wherein a second partition is disposed between the chilled water inlet tube and the chilled water outlet tube, and wherein a rear water tank separator for preventing the cooling water and the chilled water from being mixed with each other is disposed within the second rear water tank.
15. The heat exchange device of claim 14, wherein the second water inlet tube of the second heat exchange unit and the first water inlet tube of the first heat exchange unit are in fluid communication via a conduit, and wherein the second back water tank of the second heat exchange unit comprises a cooling water return tube in fluid communication with the first back water tank of the first heat exchange unit.
16. The heat exchange device of claim 13, wherein the second heat exchange unit comprises a second tube plate, a second front water tank and a second rear water tank disposed at the second end of the second cylinder of the second heat exchange unit, wherein the second front water tank has a first chilled water inlet pipe, a second chilled water inlet pipe and a chilled water outlet pipe, wherein a front water tank partition is disposed between the first chilled water inlet pipe and the chilled water outlet pipe, and wherein a second partition is disposed between the second chilled water inlet pipe and the chilled water outlet pipe.
17. The heat exchange device of claim 16, wherein the chilled water from the first chilled water inlet line and the chilled water from the second chilled water inlet line are combined in the second rear water tank before being discharged from the second heat exchange unit through the chilled water outlet line.
18. A method of using a heat exchange device comprising:
receiving refrigerant gas discharged from the compressor outlet port in the first cylinder of the first heat exchange unit via the refrigerant first inlet;
condensing the refrigerant gas into refrigerant liquid after the refrigerant gas passes through a first condensing tube arranged in the first cylinder of the first heat exchange unit;
directing the chilled liquid through a refrigerant first outlet of the first heat exchange unit into a connecting conduit coupled to a refrigerant second inlet of a second heat exchange unit;
receiving the refrigerant liquid in a second cylinder of the second heat exchange unit via the refrigerant second inlet;
condensing the refrigerant liquid into a saturated refrigerant liquid after the refrigerant liquid passes through a second condenser tube bundle of the second heat exchange unit;
directing the saturated refrigerant liquid through a refrigerant distributor disposed within the second barrel of the second heat exchange unit such that the saturated refrigerant liquid becomes a two-phase refrigerant; and
and after the two-phase refrigerant passes through an evaporation tube bundle arranged in the second cylinder of the second heat exchange unit, evaporating the two-phase refrigerant into low-pressure refrigerating gas.
19. The method of claim 18, comprising directing the low pressure refrigerant gas to a compressor suction port via a refrigerant second outlet of the second heat exchange unit.
20. A method according to claim 18, comprising directing the refrigerant liquid through a throttling device disposed along the connecting conduit to expand the liquid refrigerant before the refrigerant liquid is received into the second cylinder of the second heat exchange unit.
21. The method of claim 18, comprising:
directing a first portion of the cooling water through the first condenser tube bundle disposed within the first heat exchange unit;
directing a second portion of said cooling water through said second condenser tube bundle disposed within said second heat exchange unit; and
directing chilled water through the evaporator tube bundle disposed within the second heat exchange unit.
22. The method of claim 21, comprising combining the first portion of the cooling water and the second portion of the cooling water in a post-tank of the first heat exchange unit.
23. The method of claim 18, comprising:
directing cooling water through the first condenser tube bundle disposed within the first heat exchange unit;
directing a first portion of the chilled water through the second condenser tube bundle disposed within the second heat exchange unit;
directing a second portion of the chilled water through the evaporator tube bundle disposed within the second heat exchange unit; and
combining the first portion of the chilled water and the second portion of the chilled water in a post-tank of the second heat exchange unit.
24. A heat exchange device comprising:
a first heat exchange unit comprising a first condenser tube bundle and a first impingement plate disposed within a first barrel of the first heat exchange unit, wherein the first impingement plate is disposed in the first barrel proximate a refrigerant first inlet; and
the second heat exchange unit comprises a refrigerant distributor, a second anti-impact plate, a second condensation tube bundle and an evaporation tube bundle which are arranged in a second barrel of the second heat exchange unit, wherein a first outlet of a refrigerant of the first heat exchange unit is communicated with a second inlet of the refrigerant of the second heat exchange unit through a throttling device, and the second anti-impact plate is arranged in the second barrel and close to the second inlet of the refrigerant.
25. The heat exchange device of claim 24, wherein the refrigerant distributor extends in an axial direction of the second cylinder to form a cavity within the second cylinder, the cavity comprising an upper portion and a lower portion, the second condenser tube bundle being disposed in the upper portion of the cavity and the evaporator tube bundle being disposed in the lower portion of the cavity.
26. The heat exchange device of claim 24, wherein the first heat exchange unit comprises a first tube sheet, a first front header and a first rear header disposed at a first end of the first barrel of the first heat exchange unit, wherein the first front header has a first inlet tube and a first outlet tube for cooling water, and wherein a first dividing partition is disposed within the first front header and separates the first outlet tube for cooling water from the first inlet tube.
27. The heat exchange device of claim 26, wherein the second heat exchange unit comprises a second tube sheet, a second front tank, and a second rear tank disposed at the second end of the second cylinder of the second heat exchange unit, wherein the second front tank has a first chilled water inlet pipe, a second chilled water inlet pipe, and a chilled water outlet pipe, wherein a front tank baffle is disposed between the first chilled water inlet pipe and the chilled water outlet pipe, and wherein a second pass baffle is disposed between the second chilled water inlet pipe and the chilled water outlet pipe.
28. The heat exchange device of claim 26, wherein the second heat exchange unit comprises a second tube plate, a second front water tank and a second rear water tank disposed at the second end of the second cylinder of the second heat exchange unit, wherein the second front water tank has a second water inlet tube, a chilled water inlet tube and a chilled water outlet tube, wherein a front water tank separator that prevents cooling water and chilled water from mixing with each other is disposed between the second water inlet tube and the chilled water outlet tube, wherein a second partition is disposed between the chilled water inlet tube and the chilled water outlet tube, and wherein a rear water tank separator that prevents the cooling water and the chilled water from mixing with each other is disposed within the second rear water tank.
29. A heat exchange apparatus for a low pressure refrigerant comprising:
a first heat exchange unit comprising a first condenser tube bundle disposed within a first barrel of the first heat exchange unit;
a second heat exchange unit including a liquid baffle plate and a refrigerant distributor provided within a second cylinder of the second heat exchange unit, wherein a first refrigerant outlet of the first heat exchange unit and a first refrigerant inlet of the second heat exchange unit are in fluid communication through a throttling device, the liquid baffle plate extends in an axial direction of the second cylinder to form a cloth tube chamber and a gas return chamber, the refrigerant distributor is provided in the cloth tube chamber, the refrigerant distributor extends from the liquid baffle plate toward an inner surface of the second cylinder and extends in an axial direction of the second cylinder to form an upper portion and a lower portion of the cloth tube chamber, a second condensation tube bundle is provided in the upper portion of the cloth tube chamber, and an evaporation tube bundle is provided in the lower portion of the cloth tube chamber.
30. A heat exchange device comprising:
a first heat exchange unit comprising a first condenser tube bundle and a first impingement plate disposed within a first barrel of the first heat exchange unit, wherein the first impingement plate is disposed in the first barrel proximate a refrigerant first inlet; and
a second heat exchange unit comprising a liquid baffle, a refrigerant distributor, a second impingement plate, a second condenser tube bundle, and an evaporator tube bundle disposed within a second barrel of the second heat exchange unit, wherein a first refrigerant outlet of the first heat exchange unit is in fluid communication with a second refrigerant inlet of the second heat exchange unit through a throttling device, the liquid baffle extends in an axial direction of the second barrel to form a tube distribution chamber and a gas return chamber, the refrigerant distributor is disposed in the tube distribution chamber, the refrigerant distributor extends from the liquid baffle toward an inner surface of the second barrel and extends in an axial direction of the second barrel to form an upper portion and a lower portion of the tube distribution chamber, the second condenser tube bundle is disposed in the upper portion of the tube distribution chamber, and the evaporator tube bundle is disposed in the lower portion of the tube distribution chamber, and the second impingement plate is disposed in the second barrel proximate to the second refrigerant inlet.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610095118.6A CN107101420B (en) | 2016-02-19 | 2016-02-19 | Heat exchange device suitable for low-pressure refrigerant |
| US15/436,164 US10295234B2 (en) | 2016-02-19 | 2017-02-17 | Heat exchange device suitable for low pressure refrigerant |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610095118.6A CN107101420B (en) | 2016-02-19 | 2016-02-19 | Heat exchange device suitable for low-pressure refrigerant |
Publications (2)
| Publication Number | Publication Date |
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| CN107101420A CN107101420A (en) | 2017-08-29 |
| CN107101420B true CN107101420B (en) | 2023-04-07 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201610095118.6A Active CN107101420B (en) | 2016-02-19 | 2016-02-19 | Heat exchange device suitable for low-pressure refrigerant |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP7098680B2 (en) * | 2020-04-03 | 2022-07-11 | 三菱重工サーマルシステムズ株式会社 | Evaporator |
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| CN101067526A (en) * | 2006-09-28 | 2007-11-07 | 李华玉 | Heat pump phase transformation heat supply and application technique thereof |
| WO2009089694A1 (en) * | 2008-01-18 | 2009-07-23 | Yang Xu | A falling-film evaporation-cooling absorption refrigeration unit |
| US20130277018A1 (en) * | 2012-04-23 | 2013-10-24 | Aaf-Mcquay Inc. | Heat exchanger |
| US20150007604A1 (en) * | 2008-01-02 | 2015-01-08 | Johnson Controls Technology Company | Heat exchanger |
| CN205641700U (en) * | 2016-02-19 | 2016-10-12 | 约克（无锡）空调冷冻设备有限公司 | Heat transfer device suitable for pressure refrigerant |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101067526A (en) * | 2006-09-28 | 2007-11-07 | 李华玉 | Heat pump phase transformation heat supply and application technique thereof |
| US20150007604A1 (en) * | 2008-01-02 | 2015-01-08 | Johnson Controls Technology Company | Heat exchanger |
| WO2009089694A1 (en) * | 2008-01-18 | 2009-07-23 | Yang Xu | A falling-film evaporation-cooling absorption refrigeration unit |
| US20130277018A1 (en) * | 2012-04-23 | 2013-10-24 | Aaf-Mcquay Inc. | Heat exchanger |
| CN205641700U (en) * | 2016-02-19 | 2016-10-12 | 约克（无锡）空调冷冻设备有限公司 | Heat transfer device suitable for pressure refrigerant |
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| CN107101420A (en) | 2017-08-29 |
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