CN107131687B - Heat exchange device suitable for low-pressure refrigerant - Google Patents
Heat exchange device suitable for low-pressure refrigerant Download PDFInfo
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- CN107131687B CN107131687B CN201610112227.4A CN201610112227A CN107131687B CN 107131687 B CN107131687 B CN 107131687B CN 201610112227 A CN201610112227 A CN 201610112227A CN 107131687 B CN107131687 B CN 107131687B
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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
- F25B41/00—Fluid-circulation arrangements
- F25B41/30—Expansion means; Dispositions thereof
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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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Abstract
The invention discloses a heat exchange device suitable for low-pressure refrigerant, which comprises a condenser, an evaporator and a throttling device, wherein an evaporation tube bundle is arranged in the evaporator, an ejector used for introducing refrigerant liquid in the evaporator into the evaporation tube bundle for redistribution is also connected between the condenser and the evaporator, and the ejector is provided with a high-pressure tube, a low-pressure tube and an outlet tube. The heat exchange device overcomes the defects of a refrigerant distributor in the traditional falling film evaporator, can be suitable for a system adopting low-pressure refrigerant, and has the advantages of simple structure, high heat transfer efficiency, less refrigerant filling quantity and the like.
Description
Technical Field
The invention relates to the technical field of refrigeration, in particular to a heat exchange device suitable for low-pressure refrigerants.
Background
The falling film evaporator has been used in more and more refrigerating air conditioning units due to the characteristics of higher heat transfer efficiency, less refrigerant charge and the like. The falling film evaporator generally employs the configuration shown in fig. 1, which includes evaporator refrigerant outlet tubes 25, liquid inlet tubes 24, refrigerant distributor 22, and evaporating tube bundles 23. The gas-liquid two-phase refrigerant enters the evaporator through the liquid inlet pipe 24, and after passing through the refrigerant distributor 22, the refrigerant drops fall on the evaporation tube bundle 23 to perform evaporation heat exchange, and the generated refrigerant gas is discharged through the evaporator refrigerant outlet pipe 25 and enters the compressor. The refrigerant distributor 22 in fig. 1 is a critical component in a falling film evaporator and generally requires a sufficient pressure differential on the inside and outside of the refrigerant distributor to achieve uniform distribution of refrigerant to the evaporating tube bundles. For example, in a refrigeration unit employing a medium-high pressure refrigerant (e.g., R134a, etc.), the difference between the inner and outer pressure of the refrigerant distributor is typically 150 kPa to 300kPa.
The low-pressure refrigerant R1233zd (E) has been paid more attention to in the refrigeration and air-conditioning industry because of the advantages of environmental protection, high efficiency and the like, and table 1 is a typical refrigeration working condition (evaporation temperature 5 ℃ and condensation temperature 36.7 ℃), and the difference between the evaporation pressure and the condensation pressure of R1233zd (E) and R134a is only 23.1% of that of R134a can be seen by comparing the evaporation pressure and the condensation pressure of R1233zd (E). For low pressure refrigerants such as R1233zd (E), the refrigerant distributor in conventional falling film evaporators is clearly inadequate.
TABLE 1 typical refrigeration Condition
Therefore, there is a need for a heat exchange device that can effectively and uniformly distribute refrigerant to heat exchange tubes, and is suitable for use with low pressure refrigerants.
Disclosure of Invention
The invention aims to provide a heat exchange device suitable for low-pressure refrigerant, which overcomes the defect of a refrigerant distributor in a traditional falling film evaporator, well solves the problem of evaporator refrigerant distribution of low-pressure refrigerant, and can be suitable for a system adopting low-pressure refrigerant.
In one aspect, the invention provides a heat exchange device suitable for low-pressure refrigerant, which comprises a condenser, an evaporator and a throttling device, wherein an evaporation tube bundle is arranged in the evaporator, an ejector used for introducing refrigerant liquid in the evaporator into the evaporation tube bundle for redistribution is further connected between the condenser and the evaporator, and the ejector is provided with a high-pressure tube, a low-pressure tube and an outlet tube.
In one embodiment, the evaporator is internally arranged with a refrigerant distributor, a falling film tube bundle, and a gas-liquid separation chamber, the evaporation tube bundle comprising a falling film tube bundle.
In one embodiment, the high pressure pipe of the ejector is communicated with the outlet pipe of the condenser, the low pressure pipe of the ejector is communicated with the bottom of the evaporator, the outlet pipe of the ejector is communicated with the inlet pipe of the evaporator, and the throttling device is arranged between the outlet pipe of the condenser and the inlet pipe of the evaporator.
In another embodiment, the outlet pipe of the condenser is communicated with the inlet pipe of the evaporator, the evaporation pipe bundle arranged in the evaporator comprises a first flow pipe bundle and a second flow pipe bundle, the second flow pipe bundle is positioned below the refrigerant distributor, the throttling device is arranged between the outlet pipe of the condenser and the high-pressure pipe of the ejector, the low-pressure pipe of the ejector is connected to the bottom cavity of the second flow pipe bundle of the evaporator, and the outlet pipe of the ejector is communicated with the bottom cavity of the first flow pipe bundle of the evaporator.
In one embodiment, a separator plate is mounted between the first and second flow tube bundles.
In one embodiment, the condenser is provided with a refrigerant inlet pipe, a refrigerant outlet pipe, and a condenser tube bundle, a impingement plate and a subcooler are arranged in the condenser.
In another aspect, the present invention also provides a method for using the heat exchange device suitable for low-pressure refrigerant, the method comprising:
the gaseous refrigerant enters the condenser from the refrigerant inlet pipe of the condenser, passes through the impact plate and enters the condensation tube bundle to perform condensation heat exchange, saturated liquid generated by condensation flows through the subcooler and is further cooled into subcooled liquid, and the subcooled liquid flows out from the outlet pipe of the condenser; one path of refrigerant coming out from the outlet pipe of the condenser enters the throttling device through the inlet pipe of the throttling device, and the other path of refrigerant enters the ejector through the high-pressure pipe of the ejector;
the liquid refrigerant at the bottom of the evaporator enters the ejector through the ejector low-pressure pipe under the high-pressure jet flow action of liquid in the ejector high-pressure pipe;
the refrigerant entering through the high-pressure pipe in the ejector and the refrigerant entering through the low-pressure pipe are mixed into medium-pressure two-phase refrigerant, the medium-pressure two-phase refrigerant flows out through the outlet pipe of the ejector and is mixed with the refrigerant throttled by the throttling device, the medium-pressure two-phase refrigerant enters into the evaporator through the inlet pipe of the evaporator, and the medium-pressure two-phase refrigerant is distributed through the distributor and then drops on the falling film pipe bundle for evaporation;
and the refrigerant passing through the falling film tube bundle enters the gas-liquid separation cavity for separation, the gaseous refrigerant returns to the compressor through the outlet pipe of the evaporator, and the liquid refrigerant enters the ejector again.
In still another aspect, the present invention also provides a method of using the above heat exchange device suitable for low-pressure refrigerant, the method comprising:
the gaseous refrigerant enters the condenser from the refrigerant inlet pipe of the condenser, passes through the impact plate and enters the condensation tube bundle to perform condensation heat exchange, saturated liquid generated by condensation flows through the subcooler and is further cooled into subcooled liquid, and the subcooled liquid flows out from the outlet pipe of the condenser;
the high-temperature high-pressure liquid in the condenser flows out of the outlet pipe and is divided into two paths, wherein one path directly enters the evaporator through the evaporator inlet pipe, and the other path enters the throttling device through the throttling device inlet pipe;
refrigerant directly entering the evaporator enters a second flow tube bundle of the evaporator for evaporation after being throttled by the distributor;
the refrigerant entering the throttling device is throttled by the throttling device to become medium-pressure liquid, and the medium-pressure liquid enters the ejector high-pressure pipe;
the liquid refrigerant at the bottom of the second flow tube bundle of the evaporator enters the ejector through the ejector low-pressure tube under the action of high-pressure jet flow in the ejector high-pressure tube;
after the refrigerants in the ejector are mixed, the refrigerants enter the first flow evaporation tube bundle of the evaporator through the outlet pipe of the ejector, and after the refrigerants are evaporated through the first flow evaporation tube bundle, the refrigerant gas returns to the compressor through the refrigerant outlet pipe.
The invention includes any combination of any one or more of the above embodiments.
The heat exchange device suitable for the low-pressure refrigerant has the advantages of simple structure, high heat transfer efficiency, less 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, functions and advantages of the present invention will be clarified by the following description of embodiments of the present invention with reference to the accompanying drawings, in which:
FIG. 1 schematically illustrates a schematic diagram of a conventional falling film evaporator;
fig. 2 shows a schematic structural view of a heat exchange device according to a first embodiment;
fig. 3 shows a schematic structural diagram of a heat exchange device of a second embodiment;
fig. 4 shows a refrigeration cycle pressure enthalpy diagram of a heat exchange device of a second embodiment.
Detailed Description
The objects and functions of the present invention and methods for achieving these objects and functions will be elucidated by referring to exemplary embodiments. However, the present invention is not limited to the exemplary embodiments disclosed below; this may be implemented in different forms. The essence of the description is merely to aid one skilled in the relevant art in comprehensively understanding the specific details of the invention.
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In the drawings, the same reference numerals represent the same or similar components, or the same or similar steps.
In the invention, two ends of the throttling device are respectively connected with an outlet pipe of the condenser and an inlet pipe of the evaporator. When the device works, the liquid at the bottom of the evaporator is introduced into the ejector by means of the high-pressure jet flow action of the liquid in the high-pressure pipe of the ejector, mixed into medium-pressure two-phase refrigerant, mixed with the refrigerant passing through the throttling device, and then fed into the refrigerant distributor in the evaporator for distribution.
Embodiment one:
as shown in fig. 2, the heat exchange device suitable for low-pressure refrigerant in this embodiment includes a condenser 101, a throttling device 112 and an evaporator 103, an evaporation tube bundle (falling film tube bundle 119) is disposed in the evaporator 103, an ejector 102 is further connected between the condenser 101 and the evaporator 103, the ejector 102 has a high-pressure tube 108, a low-pressure tube 109 and an outlet tube 110, and the ejector 102 can reintroduce the refrigerant liquid in the evaporator 103 into the evaporator tube bundle in the evaporator 103 for redistribution. The condenser 101 is provided with a refrigerant inlet pipe 104, a refrigerant outlet pipe 107, and a condenser tube bundle 118, an impingement plate 105 and a subcooler 106 are disposed within the condenser 101. The evaporator 103 is provided with a refrigerant inlet pipe 114, a refrigerant distributor 115 is provided at an upper end inside the evaporator 103, a falling film tube bundle 119 (falling film tube bundle is one of evaporation tube bundles) is arranged inside the evaporator 103, and the evaporator 103 is further provided with a gas-liquid separation chamber 117 and a refrigerant outlet pipe 116. The ejector 102 is arranged in parallel with the throttling device 112, and an outlet pipe 110 of the ejector 102, an outlet pipe 113 of the throttling device 112 and an inlet pipe 114 of the evaporator 103 are mutually communicated. The high-pressure pipe 108 of the ejector 102, the inlet pipe 111 of the throttling device 112 and the outlet pipe 107 at the bottom of the condenser 101 are communicated with each other. The ejector 102 low pressure pipe 109 communicates with the bottom of the evaporator 103.
In operation, refrigerant enters condenser 101 from inlet tube 104 of condenser 101, passes through impingement plate 105 and condenser tube bundle 118, flows to subcooler 106, is further subcooled by subcooler 106, and then flows out through outlet tube 107 of condenser 101. One path of the refrigerant coming out from the outlet pipe 107 of the condenser 101 enters the throttling device 112 through the inlet pipe 111 of the throttling device 112, and the other path of the refrigerant enters the ejector 102 through the high-pressure pipe 108 of the ejector 102. The liquid refrigerant at the bottom of the evaporator 103 enters the ejector 102 through the low-pressure pipe 109 of the ejector 102 by virtue of the high-pressure jet action of the liquid in the high-pressure pipe 108 of the ejector 102. The refrigerant entering through the high-pressure pipe 108 and the refrigerant entering through the low-pressure pipe 109 in the ejector 102 are mixed into medium-pressure two-phase refrigerant, the medium-pressure two-phase refrigerant flows out through the outlet pipe 110 of the ejector 102 and is mixed with the refrigerant throttled by the throttle device 112, the medium-pressure two-phase refrigerant enters into the evaporator 103 through the inlet pipe 114 of the evaporator 103, is distributed through the distributor 115, and then drops on the falling film tube bundle 119 for evaporation. The refrigerant passing through the falling film tube bundle 119 enters the gas-liquid separation chamber 117 for separation, and the gaseous refrigerant returns to the compressor (not shown) through the refrigerant outlet pipe 116, and the liquid refrigerant enters the ejector 102 again.
In the device, the liquid at the bottom of the evaporator is introduced into the ejector by virtue of the high-pressure jet flow action of the liquid in the high-pressure pipe of the ejector, mixed into medium-pressure two-phase refrigerant, mixed with the refrigerant passing through the throttling device, and then fed into the refrigerant distributor in the evaporator for distribution. Due to the application of the ejector, the pressure difference of two ends of the refrigerant distributor is larger than that of the traditional falling film evaporator shown in fig. 1, which is beneficial to improving the uniformity of refrigerant distribution.
Embodiment two:
as shown in fig. 3, the heat exchange device suitable for low-pressure refrigerant in this embodiment includes a condenser 201, a throttling device 208, and an evaporator 203, and an ejector 202 is further connected between the condenser 201 and the evaporator 203. The evaporator 203 is provided with refrigerant inlet tubes 212 and refrigerant outlet tubes 214, and the evaporator tube bundle disposed inside the evaporator 203 comprises a first flow tube bundle 216 and a second flow tube bundle 215, wherein the first flow tube bundle 216 is a flooded tube bundle and the second flow tube bundle 215 is a falling film tube bundle. A refrigerant distributor 213 is disposed at the upper end of the second flow tube bundle 215, a partition plate 218 is installed between the first flow tube bundle 216 and the second flow tube bundle 215, an inlet is provided at the bottom of the first flow tube bundle 216, and an outlet is provided at the bottom of the second flow tube bundle 215. The eductor 202 has a high pressure line 211, a low pressure line 219, and an outlet line 217, and the restriction 208 has an inlet line 209 and an outlet line 211. The condenser 201 is provided with a refrigerant inlet pipe 204, a refrigerant outlet pipe 207, and a condenser tube bundle 220, a impingement plate 205 and a subcooler 206 are disposed within the condenser 201. In this embodiment, the high-pressure pipe 211 of the ejector 202 is disposed behind the throttling device 208 and is mutually communicated with the outlet pipe 210 of the throttling device 208, the low-pressure pipe 219 of the ejector 202 is mutually communicated with the bottom of the second flow tube bundle 215 of the evaporator 203, and the outlet pipe 217 of the ejector 202 is mutually communicated with the bottom of the first flow tube bundle 216 of the evaporator 203. The condenser 201 outlet tube 207 is split into two paths communicating with the evaporator 203 refrigerant inlet tube 212 and the throttle device 208 inlet tube 209.
In operation, as shown in fig. 3 and 4, refrigerant enters condenser 201 from refrigerant inlet tube 204 of condenser 201, passes through impingement plate 205 and condenser tube bundle 220, flows to subcooler 206, is further subcooled by subcooler 206, and then flows out through outlet tube 207 of condenser 201. The high-temperature high-pressure liquid in the condenser 201 flows out from the outlet pipe 207 and is divided into two paths, one path directly enters the evaporator 203 through the inlet pipe 212 of the evaporator 203, and the other path enters the throttling device 208 through the inlet pipe 209 of the throttling device 208. The refrigerant directly entering the evaporator 203, throttled by the distributor 213, falls in pressure to Pe-1 (the temperature is shown in fig. 4 as falling to 5 c by way of example), enters the evaporator 203 and evaporates in the second tube bundle 215. The refrigerant entering the throttling device 208 throttles to a pressure drop P3' through the throttling device 208 to an intermediate pressure refrigerant entering the ejector 202 high pressure tube 211. The liquid refrigerant at the bottom of the second flow tube bundle 215 of the evaporator 203 enters the ejector 202 through the low pressure tube 219 of the ejector 202 by virtue of the high pressure jet action of the refrigerant in the high pressure tube 211 of the ejector 202, and after being mixed with the refrigerant in the ejector 202, the pressure rises to Pe-2 (the temperature is raised to 8 ℃ as exemplarily shown in fig. 4), enters the first flow tube bundle of the evaporator 203 through the outlet tube 217 of the ejector 202, evaporates through the first flow tube bundle 216, and the refrigerant gas returns to the compressor (not shown in the figure) through the refrigerant outlet tube 214.
Fig. 4 is a pressure-enthalpy diagram of a refrigeration cycle in the working process of the present embodiment, in which the correspondence relationship between the refrigerant in each stage of the present embodiment is: the point a is the corresponding pressure and enthalpy value of the condenser inlet pipe; the point b is the corresponding pressure and enthalpy value of the outlet pipe of the condenser; the point c is the corresponding pressure and enthalpy value of the high-pressure pipe of the ejector; the point d is the pressure and enthalpy value of the evaporator after the refrigerant distributor throttles; the point e, the point f and the point n are the pressure and the enthalpy value of the mixed refrigerant in the ejector; the g point is the corresponding pressure and enthalpy value of the outlet pipe of the ejector; the m point is the corresponding pressure and enthalpy value of the low-pressure pipe of the ejector; and the k point is the corresponding pressure and enthalpy value of the outlet of the evaporator.
There are two advantages to using this embodiment compared to embodiment one:
1) The front-back pressure difference of the refrigerant distributor is larger and is equivalent to the pressure difference between the condensers of the evaporators, thereby being beneficial to improving the uniformity of refrigerant distribution.
2) The saturation pressure of the outlet of the evaporator is higher, which is beneficial to improving the system efficiency. As shown in fig. 4, in the conventional refrigeration system or the system of embodiment 1, the outlet saturation pressure of the evaporator is Pe-1, and in the present embodiment, the outlet saturation pressure is increased to be Pe-2, and the power consumption is saved as follows: Δh1+Δh2.
Other embodiments of the invention will be apparent to and understood by 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 (9)
1. The heat exchange device suitable for low pressure refrigerant includes one condenser, one evaporator with evaporating tube bundle, one throttling device, one ejector with high pressure pipe, low pressure pipe and outlet pipe for introducing the refrigerant liquid from the evaporator into the evaporating tube bundle for re-distribution,
wherein said condenser comprises a refrigerant outlet tube, said evaporator comprises a refrigerant inlet tube, said refrigerant outlet tube of said condenser and said refrigerant inlet tube of said evaporator are in fluid communication,
wherein the evaporator tube bundle comprises a first flow tube bundle and a second flow tube bundle, the second flow tube bundle is disposed between the first flow tube bundle and a refrigerant distributor of the evaporator, the refrigerant distributor is located above the second flow tube bundle, and a partition plate is installed between the first flow tube bundle and the second flow tube bundle,
wherein said throttling means is disposed between said refrigerant outlet line of said condenser and said high pressure line of said eductor,
wherein the throttling device is configured to receive a first portion of refrigerant from the condenser,
wherein the ejector is configured to: receiving the first portion of refrigerant from the throttling device via the high pressure tube; receiving liquid refrigerant from an outlet of the second flow tube bundle of the evaporator via the low pressure tubes; mixing the first portion of refrigerant with the liquid refrigerant to form a first mixed refrigerant; and introducing the first mixed refrigerant into the evaporator via the outlet pipe, and
wherein the first flow tube bundle of the evaporator is configured to receive the first mixed refrigerant from the outlet tube of the ejector and a second portion of refrigerant from the condenser,
wherein the low pressure tubes of the ejector are in fluid communication with a bottom of the second flow tube bundle of the evaporator and the outlet tubes of the ejector are in fluid communication with a bottom of the first flow tube bundle of the evaporator.
2. The heat exchange device of claim 1, wherein the condenser comprises the refrigerant inlet tube, a condenser tube bundle, a impingement plate, and a subcooler.
3. The heat exchange device of claim 1, wherein the evaporating tube bundle comprises a falling film tube bundle.
4. The heat exchange device suitable for low pressure refrigerant includes one condenser, one evaporator with evaporating tube bundle, one throttling device, one ejector with high pressure pipe, low pressure pipe and outlet pipe for introducing the refrigerant liquid from the evaporator into the evaporating tube bundle for re-distribution,
wherein the throttling device is configured to receive a third portion of refrigerant from the condenser,
wherein the ejector is configured to: receiving a fourth portion of refrigerant from the condenser via the high pressure tube; receiving liquid refrigerant from the evaporator via the low pressure tube; mixing the fourth portion of refrigerant with the liquid refrigerant to form a second mixed refrigerant; and introducing the second mixed refrigerant into the evaporator via the outlet pipe,
wherein the evaporator is configured to receive the second mixed refrigerant from the ejector and the third portion of refrigerant from the throttling device, and
wherein the second mixed refrigerant flowing out of the ejector via the outlet pipe and the third portion of refrigerant flowing out of the throttling device are directly introduced into the evaporator,
wherein the throttling device and the ejector are arranged in parallel;
the high-pressure pipe of the ejector is in fluid communication with the refrigerant outlet pipe of the condenser, the low-pressure pipe of the ejector is in fluid communication with the bottom of the evaporator, and the outlet pipe of the ejector is in fluid communication with the refrigerant inlet pipe of the evaporator.
5. The heat exchange device of claim 4, wherein:
the throttling device is arranged between the refrigerant outlet pipe of the condenser and the refrigerant inlet pipe of the evaporator;
the evaporator is internally provided with a refrigerant distributor and a gas-liquid separation cavity, and the evaporation tube bundle comprises a falling film tube bundle.
6. The heat exchange device of claim 4 wherein the condenser is provided with a refrigerant inlet tube, a refrigerant outlet tube, and wherein the condenser is provided with a condenser tube bundle, an impingement plate and a subcooler.
7. A method of using the heat exchange device of any of claims 4-6, the method comprising:
gaseous refrigerant enters the condenser through a refrigerant inlet pipe of the condenser of the heat exchange device, passes through a shock-proof plate of the condenser, enters a condensation tube bundle of the condenser to perform condensation heat exchange, and saturated liquid generated by condensation flows through a subcooler of the condenser to be further cooled into subcooled liquid and flows out through a refrigerant outlet pipe of the condenser;
one path of the refrigerant coming out from the refrigerant outlet pipe of the condenser enters the throttling device through the throttling device inlet pipe of the heat exchange device, and the other path of the refrigerant enters the ejector through the high-pressure pipe of the ejector of the heat exchange device;
the liquid refrigerant at the bottom of the evaporator enters the ejector through a low-pressure pipe of the ejector under the high-pressure jet flow action of liquid in the high-pressure pipe of the ejector;
the refrigerant entering through the high-pressure pipe in the ejector and the refrigerant entering through the low-pressure pipe of the ejector are mixed into medium-pressure two-phase refrigerant, the medium-pressure two-phase refrigerant flows out through the outlet pipe of the ejector and is mixed with the refrigerant throttled by the throttling device, the medium-pressure two-phase refrigerant enters the evaporator through the refrigerant inlet pipe of the evaporator, and the medium-pressure two-phase refrigerant is dropped on a falling film tube bundle of the evaporator for evaporation after being distributed through the distributor in the evaporator;
the refrigerant passing through the falling film tube bundle enters a gas-liquid separation cavity of the evaporator for separation, the gaseous refrigerant returns to the compressor of the heat exchange device through an outlet pipe of the evaporator, and the liquid refrigerant enters the ejector again.
8. A method of using the heat exchange device of any of claims 1-3, the method comprising:
gaseous refrigerant enters the condenser from a refrigerant inlet pipe of the condenser of the heat exchange device, passes through a shock-proof plate of the condenser, enters a condensation pipe bundle of the condenser to perform condensation heat exchange, and saturated liquid generated by condensation flows through a subcooler of the condenser to be further cooled into subcooled liquid and flows out from a refrigerant outlet pipe of the condenser;
the high-temperature high-pressure liquid in the condenser flows out of the refrigerant outlet pipe and is divided into two paths, wherein one path of liquid directly enters the evaporator through the refrigerant inlet pipe of the evaporator of the heat exchange device, and the other path of liquid enters the throttling device through the throttling device inlet pipe of the heat exchange device;
refrigerant directly entering the evaporator enters a second flow tube bundle of the evaporator for evaporation after being throttled by a distributor of the evaporator;
the refrigerant entering the throttling device is throttled by the throttling device and becomes medium-pressure liquid to enter a high-pressure pipe of an ejector of the heat exchange device;
the liquid refrigerant at the bottom of the second flow tube bundle of the evaporator enters the ejector through the low-pressure tube of the ejector under the action of high-pressure jet flow in the high-pressure tube of the ejector;
after the refrigerants in the ejector are mixed, the refrigerants enter a first flow evaporation tube bundle of the evaporator through an outlet pipe of the ejector, and after the refrigerants are evaporated through the first flow evaporation tube bundle, the refrigerant gas returns to a compressor of the heat exchange device through a refrigerant outlet pipe of the evaporator.
9. A heat exchange device, comprising:
a condenser configured to receive a refrigerant, the condenser comprising a refrigerant outlet tube;
an evaporator comprising an evaporator tube bundle, wherein the evaporator comprises a refrigerant inlet tube configured to be in fluid communication with the refrigerant outlet tube of the condenser and to receive an amount of refrigerant directly from the refrigerant outlet tube of the condenser, the evaporator tube bundle comprising a first flow tube bundle and a second flow tube bundle, the second flow tube bundle disposed between the first flow tube bundle and a refrigerant distributor of the evaporator, wherein the refrigerant distributor is located above the second flow tube bundle, and a separator plate is mounted between the first flow tube bundle and the second flow tube bundle;
a throttling device disposed between the evaporator and the condenser, wherein the throttling device is configured to receive a first portion of refrigerant from the condenser; and
an ejector disposed between the evaporator and the condenser, wherein the ejector comprises a high pressure tube, a low pressure tube, and an outlet tube, the ejector configured to receive the first portion of the refrigerant from the throttling device via the high pressure tube, the ejector configured to receive a second portion of the refrigerant from an outlet of the second flow tube bundle of the evaporator via the low pressure tube, and the ejector configured to mix the first portion of the refrigerant and the second portion of the refrigerant to form a mixed refrigerant and to direct the mixed refrigerant to the evaporator via the outlet tube, wherein the low pressure tube of the ejector is in fluid communication with a bottom of the second flow tube bundle of the evaporator, and the outlet tube of the ejector is in fluid communication with a bottom of the first flow tube bundle of the evaporator.
Priority Applications (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610112227.4A CN107131687B (en) | 2016-02-29 | 2016-02-29 | Heat exchange device suitable for low-pressure refrigerant |
| US16/081,007 US10739047B2 (en) | 2016-02-29 | 2017-02-28 | Heat exchange device suitable for low pressure refrigerant |
| JP2018546425A JP6665312B2 (en) | 2016-02-29 | 2017-02-28 | Heat exchange device suitable for low pressure refrigerant |
| KR1020187027873A KR102193293B1 (en) | 2016-02-29 | 2017-02-28 | Heat exchanger suitable for low pressure refrigerant |
| EP17711415.4A EP3423771B1 (en) | 2016-02-29 | 2017-02-28 | Heat exchange device suitable for low pressure refrigerant |
| PCT/US2017/019965 WO2017151626A1 (en) | 2016-02-29 | 2017-02-28 | Heat exchange device suitable for low pressure refrigerant |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610112227.4A CN107131687B (en) | 2016-02-29 | 2016-02-29 | Heat exchange device suitable for low-pressure refrigerant |
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| CN107131687A CN107131687A (en) | 2017-09-05 |
| CN107131687B true CN107131687B (en) | 2023-07-11 |
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| US10697674B2 (en) | 2018-07-10 | 2020-06-30 | Johnson Controls Technology Company | Bypass line for refrigerant |
| CN114562905A (en) * | 2022-01-25 | 2022-05-31 | 杭州制氧机集团股份有限公司 | Dividing wall type and contact type combined cooling device |
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| JP4923838B2 (en) * | 2005-08-17 | 2012-04-25 | 株式会社デンソー | Ejector refrigeration cycle |
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