CN110145894B - A multi-stage heat exchange absorption refrigeration and heat dissipation system for built-in display cabinets - Google Patents
A multi-stage heat exchange absorption refrigeration and heat dissipation system for built-in display cabinets Download PDFInfo
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- CN110145894B CN110145894B CN201910432013.9A CN201910432013A CN110145894B CN 110145894 B CN110145894 B CN 110145894B CN 201910432013 A CN201910432013 A CN 201910432013A CN 110145894 B CN110145894 B CN 110145894B
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- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47F—SPECIAL FURNITURE, FITTINGS, OR ACCESSORIES FOR SHOPS, STOREHOUSES, BARS, RESTAURANTS OR THE LIKE; PAYING COUNTERS
- A47F3/00—Show cases or show cabinets
- A47F3/04—Show cases or show cabinets air-conditioned, refrigerated
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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
- F25B25/00—Machines, plants or systems, using a combination of modes of operation covered by two or more of the groups F25B1/00 - F25B23/00
- F25B25/02—Compression-sorption machines, plants, or systems
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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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/27—Relating to heating, ventilation or air conditioning [HVAC] technologies
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/62—Absorption based systems
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Sorption Type Refrigeration Machines (AREA)
Abstract
本发明公开了一种用于内藏式展示柜的多级换热吸收式制冷散热系统，包括制冷剂循环装置和吸收式制冷装置，制冷剂循环装置包括压缩机、板式换热器、电磁阀、节流降压部件和第一蒸发器；吸收式制冷装置包括发生器、冷凝器、蒸发器、第一吸收器和储液罐，发生器与第二蒸发器相连接，发生器的顶部与冷凝器入口相连接，冷凝器出口与第二蒸发器入口相连接；发生器与冷凝器相连接的管线上还设置有分离器，第二蒸发器、分离器均分别通过管线与第一吸收器相连接。本发明在板式换热器中实现制冷剂与载冷剂的热交换，制冷剂循环装置为载冷剂冷却，实现了系统热量从室内转移到室外，降低能耗；解决了制冷效果差的问题，提升了设备制冷效率，减少系统故障率。
The present invention discloses a multi-stage heat exchange absorption refrigeration and heat dissipation system for a built-in display cabinet, including a refrigerant circulation device and an absorption refrigeration device, wherein the refrigerant circulation device includes a compressor, a plate heat exchanger, a solenoid valve, a throttling and pressure reduction component, and a first evaporator; the absorption refrigeration device includes a generator, a condenser, an evaporator, a first absorber, and a liquid storage tank, the generator is connected to the second evaporator, the top of the generator is connected to the condenser inlet, and the condenser outlet is connected to the second evaporator inlet; a separator is also provided on the pipeline connecting the generator and the condenser, and the second evaporator and the separator are respectively connected to the first absorber through pipelines. The present invention realizes heat exchange between refrigerant and coolant in the plate heat exchanger, and the refrigerant circulation device cools the coolant, realizes the transfer of system heat from indoors to outdoors, and reduces energy consumption; solves the problem of poor refrigeration effect, improves the refrigeration efficiency of the equipment, and reduces the system failure rate.
Description
Technical Field
The invention relates to the technical field of refrigeration systems, in particular to a multistage heat exchange absorption type refrigeration and heat dissipation system for a built-in display cabinet.
Background
At present, most of the refrigerating systems of the concealed showcases use air-cooled condensers, the refrigerating efficiency is low, and the heat of the systems is directly discharged indoors. When the indoor environment temperature is high, especially in summer, the load of the indoor air conditioner can be increased due to the increase of indoor heat, extra electric energy consumption is increased, and the use cost is increased.
When the night air conditioner is closed, indoor system heat cannot be effectively discharged, exhaust temperature of a system compressor can be increased, the whole refrigeration effect of equipment is very easy to be poor due to overhigh condensing pressure, and the equipment is subjected to frequent fault alarm, in addition, goods in the cabinet are easy to deteriorate, equipment is damaged when serious, and great potential safety hazards exist in use of the concealed display cabinet.
Disclosure of Invention
In order to solve the technical problems, the invention discloses a multistage heat exchange absorption type refrigerating and radiating system for a built-in showcase.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
A multistage heat transfer absorption refrigeration cooling system for concealed showcase includes refrigerant circulation device and absorption refrigeration device, wherein:
The refrigerant circulation device comprises a compressor, a plate heat exchanger, an electromagnetic valve, a throttling and depressurization component and a first evaporator which are sequentially connected through pipelines, wherein the mode that the refrigerant enters the plate heat exchanger is up-in and down-out, and the electromagnetic valve can control the opening or closing of the refrigerant conveying entering the first evaporator and the compressor;
when ammonia is used as a refrigerant and water is used as an absorbent, helium is used as a balance medium, the absorption refrigeration device comprises a generator, a first condenser, a second evaporator, a first absorber and a liquid storage tank, wherein the generator is connected with the second evaporator, the top of the generator is connected with an inlet of the first condenser, an outlet of the first condenser is connected with an inlet of the second evaporator, a separator is further arranged on a pipeline connected with the generator and the first condenser, the second evaporator and the separator are respectively connected with the first absorber through pipelines, the first absorber is connected with the liquid storage tank, and the liquid storage tank is respectively connected with the generator and the second evaporator through pipelines.
As a further preferred aspect of the present invention, a first restrictor is installed on a line connecting the separator and the generator, a second restrictor is installed on a line connecting the first condenser and the second evaporator, and a third restrictor is installed on a line connecting the liquid storage tank and the generator.
As a further preferred aspect of the present invention, in the absorption refrigeration device, the ammonia water mixture is in the generator, the helium gas is in the liquid storage tank, and the working flow is divided into two coolant cooling processes:
The high-temperature secondary refrigerant discharged from the plate heat exchanger is sent into the generator through the circulating pump to transfer heat to an ammonia water mixture in the generator, refrigerant ammonia with low boiling point in the ammonia water mixture in the generator is heated and evaporated and rises with a small amount of water vapor, and enters the separator, so that self heat is reduced, and the primary cooling process of the secondary refrigerant is completed;
The ammonia and water vapor are trapped after passing through the separator, most of absorbent water enters the first absorber through the first throttle, high-temperature ammonia releases heat to be liquid through the first condenser, then the high-temperature ammonia is reduced to evaporation pressure through the second throttle, liquid ammonia enters the second evaporator again, meanwhile, inert gas helium which is insoluble in water rises from a high-pressure liquid storage tank and enters the second evaporator, under the action of helium flow, the liquid ammonia can rapidly absorb heat of the secondary refrigerant after the primary cooling from the generator, and meanwhile, the liquid ammonia is also excited to be ammonia, so that the secondary cooling process of the secondary refrigerant is completed.
Helium and ammonia mixed gas and water are converged in the first absorber, ammonia is dissolved in water, the ammonia and helium enter a liquid storage tank together, helium rises under pressure and then enters the second evaporator through a pipeline to form independent helium circulation, and ammonia water enters the generator through the third restrictor to form solution circulation.
The high-temperature secondary refrigerant is discharged from the second evaporator after being cooled twice in the absorption refrigeration device and is continuously sent into the refrigerant circulation device, and the high-temperature secondary refrigerant is circulated and reciprocated in the way.
The invention also discloses another multistage heat exchange absorption refrigeration and heat dissipation system for the concealed showcase, which comprises a refrigerant circulation device and an absorption refrigeration device, wherein:
The refrigerant circulation device comprises a compressor, a plate heat exchanger, an electromagnetic valve, a throttling and depressurization component and a first evaporator which are sequentially connected through pipelines, wherein the mode that the refrigerant enters the plate heat exchanger is up-in and down-out, and the electromagnetic valve can control the opening or closing of the refrigerant conveying entering the first evaporator and the compressor;
When water is used as a refrigerant and lithium bromide solution is used as an absorbent, the absorption refrigeration device comprises a generator, a second condenser, a third evaporator, a second absorber and a heat exchanger, wherein the generator is connected with the third evaporator, the top of the generator is connected with an inlet of the second condenser, an outlet of the second condenser is connected with the third evaporator, the second absorber is respectively connected with the second condenser and the third evaporator, the bottom of the second absorber is also connected with the heat exchanger through pipelines, and the heat exchanger is also connected with the generator.
As a further preferred aspect of the present invention, a fourth throttle is installed on a line connecting the second condenser and the third evaporator, and a fifth throttle is installed on a line connecting the second absorber and the heat exchanger.
As a further preferred aspect of the present invention, in the absorption refrigeration device, water and lithium bromide are placed in a generator, and the working flow thereof is divided into two coolant cooling processes:
The high-temperature secondary refrigerant discharged from the plate heat exchanger is sent into the generator through the circulating pump to transfer heat to the lithium bromide-water solution mixture in the generator, and refrigerant water with low boiling point in the lithium bromide-water solution mixture in the generator is heated, evaporated and risen, and enters the second condenser, so that the self heat is reduced, and the primary cooling process of the secondary refrigerant is completed;
After the water of the lithium bromide-water mixture in the generator is evaporated and rises, the remaining lithium bromide concentrated solution passes through the heat exchanger and the fifth throttle valve and then is changed into lithium bromide dilute solution in the second absorber, and then the lithium bromide dilute solution is pumped into the heat exchanger through the second solution pump for heat exchange; the high-temperature water vapor releases heat to become liquid through the second condenser, then is reduced in pressure to the evaporating pressure through the fourth restrictor, and then enters the third evaporator to be rapidly expanded and vaporized, and a large amount of heat of the secondary refrigerant after the primary cooling from the generator is absorbed in the vaporization process, and meanwhile, the liquid water is also excited to become water vapor, so that the secondary cooling process of the secondary refrigerant is completed;
the water vapor is absorbed by the lithium bromide solution in the second absorber, the concentration of the lithium bromide solution is reduced, and the solution is sent into the generator through the heat exchanger by the second solution pump to form solution circulation.
The high-temperature secondary refrigerant is discharged from the third evaporator after being cooled twice in the absorption refrigeration device and is continuously sent into the refrigerant circulation device to be circulated and reciprocated.
As a further preferred mode of the invention, in the secondary cooling process of the secondary refrigerant, in order to improve the heat exchange efficiency, a first solution pump is arranged at the bottom of the third evaporator and is used for circulating liquid water to the top of the third evaporator and uniformly spraying the liquid water through a spray head so as to fully increase the heat exchange area.
As a further preferred aspect of the present invention, the operation flow of the refrigerant cycle device is as follows:
The high-temperature and high-pressure refrigerant from the compressor enters the plate heat exchanger, the high-temperature and high-pressure refrigerant and the secondary refrigerant exchange heat in the plate heat exchanger, the high-temperature and high-pressure refrigerant is condensed into high-pressure liquid refrigerant, the liquid refrigerant enters the first evaporator through the throttling and depressurization component, absorbs heat in the first evaporator to become gas, the gas low-temperature refrigerant is absorbed back to the compressor after being overheated in the first evaporator, and is compressed into the high-temperature and high-pressure refrigerant again, so that the circulation process of the refrigerant is completed, and the circulation is repeated.
As a further preferred aspect of the invention, auxiliary electrical heating is used to heat the mixture in the generator, depending on the ambient temperature.
As a further preferable mode of the invention, the secondary refrigerant is liquid suitable for the environment temperature of 50 ℃ below zero to 50 ℃, and the secondary refrigerant is one of water, glycol and antifreeze.
In the invention, the refrigerant in the refrigerating system is condensed by utilizing the refrigerant with a certain temperature, and the refrigerant is cooled twice by the outdoor absorption refrigerating device, so that the heat generated in the room is transferred to the outdoor air-cooled radiator, and the process of transferring the heat of the system from the room to the outside is realized.
When ammonia is used as refrigerant and water is used as absorbent and helium is used as balance medium, the absorption refrigerating device utilizes the characteristic that ammonia vapor of low boiling point component can be separated out from ammonia-water solution under certain condition and water can strongly absorb ammonia vapor of low boiling point component to form ammonia-water solution under another condition to complete refrigerating cycle, helium acts as a pushing agent after absorbing ammonia vapor by water to drive ammonia-water solution to flow forwards.
When water is used as refrigerant and lithium bromide solution is used as absorbent, the absorption refrigerating device utilizes the characteristic that the lithium bromide-water solution can separate out water vapor of low boiling point component under certain condition and the lithium bromide solution can strongly absorb the water vapor of low boiling point component to form lithium bromide-water solution under another condition to complete refrigeration cycle.
The invention has the advantages that,
The plate type heat exchanger is used for replacing a traditional air-cooled condenser, heat exchange between the refrigerant and the secondary refrigerant is realized in the plate type heat exchanger, and the outdoor absorption type refrigerating device is used for radiating the circulated secondary refrigerant, so that heat of a system is transferred from indoor to outdoor, the indoor heat is greatly reduced, the load of an air conditioner is reduced, the energy consumption is reduced, the problem of poor refrigerating effect caused by high pressure of a refrigerating system is perfectly solved, the integral refrigerating efficiency of equipment is effectively improved, and the failure rate of the system is reduced.
Drawings
FIG. 1 is a schematic flow diagram of a refrigerant cycle device according to the present invention;
Fig. 2 is a schematic flow chart of an absorption refrigeration device in embodiment 1 of the present invention;
fig. 3 is a schematic flow chart of an absorption refrigeration device in embodiment 2 of the present invention.
Wherein, the device comprises a 1-compressor, a 2-plate heat exchanger, a 3-electromagnetic valve, a 4-throttling depressurization component, a 5-first evaporator, a 6-absorption refrigeration device, a 7-circulating pump, an 8-generator, a 9-first condenser, a 10-second evaporator, a 11-first absorber, a 12-liquid storage tank, a 13-separator, a 14-first restrictor, a 15-second restrictor, a 16-third restrictor, a 17-second condenser, a 18-third evaporator, a 19-second absorber, a 20-heat exchanger, a 21-fourth restrictor, a 22-first solution pump, a 23-second solution pump and a 24-fifth restrictor.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
As shown in the figure, a multistage heat exchange absorption refrigeration and heat dissipation system for a concealed showcase comprises a refrigerant circulation device and an absorption refrigeration device 6, wherein:
The refrigerant circulation device, as shown in fig. 1, comprises a compressor 1, a plate heat exchanger 2, an electromagnetic valve 3, a throttling and depressurization component 4 and a first evaporator 5 which are sequentially connected through pipelines, wherein the mode that the refrigerant enters the plate heat exchanger 2 is up-in and down-out, and the electromagnetic valve 3 can control the opening or closing of the refrigerant conveying entering the first evaporator 5 and the compressor 1;
When ammonia is used as a refrigerant and water is used as an absorbent, and helium is used as a balance medium, as shown in fig. 2, the absorption refrigeration device 6 comprises a generator 8, a first condenser 9, a second evaporator 10, a first absorber 11 and a liquid storage tank 12, wherein the generator 8 is connected with the second evaporator 10, the top of the generator 8 is connected with the inlet of the first condenser 9, the outlet of the first condenser 9 is connected with the inlet of the second evaporator 10, a separator 13 is further arranged on a pipeline connecting the generator 8 with the first condenser 9, the second evaporator 10 and the separator 13 are respectively connected with the first absorber 11 through pipelines, the first absorber 11 is connected with the liquid storage tank 12, and the liquid storage tank 12 is respectively connected with the generator 8 and the second evaporator 10 through pipelines.
In particular, the separator 13 is provided with a first restrictor 14 in the line connecting the generator 8, the first condenser 9 is provided with a second restrictor 15 in the line connecting the second evaporator 10, and the reservoir 12 is provided with a third restrictor 16 in the line connecting the generator 8.
In particular, in the absorption chiller 6, the ammonia water mixture is in the generator 8 and the helium gas is in the tank 12, the workflow of which is divided into two coolant cooling processes:
The high-temperature secondary refrigerant discharged from the plate heat exchanger 2 is sent into the generator 8 through the circulating pump 7, heat is transferred to an ammonia water mixture in the generator 8, refrigerant ammonia with low boiling point in the ammonia water mixture in the generator 8 is heated and evaporated, and rises with a small amount of water vapor, and enters the separator 13, so that self heat is reduced, and the primary cooling process of the secondary refrigerant is completed.
The ammonia and water vapor are trapped after passing through the separator 13, most of the absorbent water enters the first absorber 11 through the first throttle 14, the high-temperature ammonia releases heat to be liquid through the first condenser 9, then the high-temperature ammonia is reduced to evaporation pressure through the second throttle 15, and the liquid ammonia enters the second evaporator 10 again, meanwhile, the inert gas helium which is insoluble in water rises from the high-pressure liquid storage tank 12 and enters the second evaporator 10, and under the action of helium flow, the liquid ammonia can quickly absorb the heat of the secondary refrigerant after the primary cooling from the generator 8, and meanwhile, the liquid ammonia is also excited to be ammonia, so that the secondary cooling process of the secondary refrigerant is completed.
Helium and ammonia mixed gas and water are converged in the first absorber 11, ammonia is dissolved in water and enters the liquid storage tank 12 together with helium, the helium rises under pressure and then enters the second evaporator 10 through a pipeline to form independent helium circulation, and ammonia water enters the generator 8 through the third restrictor 16 to form solution circulation.
The high-temperature coolant is discharged from the second evaporator 10 after being cooled twice in the absorption refrigeration device 6, and is continuously fed into the refrigerant circulation device, and is circulated and reciprocated in this way.
In particular, the throttle reducing component 4 is an expansion valve or a capillary tube, which can throttle reducing refrigerant and provide proper refrigerant flow.
In particular, when the system is abnormal, the electromagnetic valve 3 controls to cut off the supply of the liquid refrigerant, and when the system is in fault, the supply of the refrigerant is cut off, so that the whole system can be effectively protected.
In particular, the coolant is a liquid suitable for use at an ambient temperature of-50 ℃ to 50 ℃, and water is selected for the coolant in this embodiment.
In particular, in winter, auxiliary electric heating is selected to heat the ammonia water mixture in the generator 8 according to the ambient temperature.
Particularly, the radiator is a fin radiator which is vertically arranged in the box body, and the heat exchange area is large.
In the invention, the plate heat exchanger 2 is used as the water-cooled first condenser 9, so that the heat exchange efficiency is high, the occupied space is small, and the heat-dissipating medium secondary refrigerant is liquid suitable for the ambient temperature of-50 ℃ to 50 ℃, so that the application range is wide.
The system uses circulating refrigerating medium to cool high-temperature and high-pressure refrigerant discharged by the compressor 1, so that the heat exchange efficiency can be greatly improved, meanwhile, the absorption refrigeration device 6 is used for cooling the circulating refrigerating medium, the refrigerating medium subjected to twice cooling is continuously sent into the refrigerating medium circulation device for cyclic utilization, and accordingly indoor system heat is transferred to an outdoor environment, in addition, the problem that the pressure of a refrigeration system is high inevitably occurs when the temperature of the traditional air-cooled first condenser 9 is high in summer environment, the refrigeration effect is poor due to the high pressure, and the problems of poor refrigeration effect and frequent alarm of equipment can be thoroughly solved.
Example 2
A multistage heat exchange absorption refrigeration heat dissipation system for a concealed showcase, comprising a refrigerant circulation device and an absorption refrigeration device 6, wherein:
the refrigerant circulation device comprises a compressor 1, a plate heat exchanger 2, an electromagnetic valve 3, a throttling and depressurization component 4 and a first evaporator 5 which are sequentially connected through pipelines, wherein the mode of entering the plate heat exchanger 2 is that the refrigerant enters the plate heat exchanger in an up-down mode, and the electromagnetic valve 3 can control the opening or closing of the refrigerant conveying entering the first evaporator 5 and the compressor 1;
When water is used as a refrigerant and lithium bromide solution is used as an absorbent, the absorption refrigeration device 6 comprises a generator 8, a second condenser 17, a third evaporator 18, a second absorber 19 and a heat exchanger 20, wherein the generator 8 is connected with the third evaporator 18, the top of the generator 8 is connected with the inlet of the second condenser 17, the outlet of the second condenser 17 is connected with the third evaporator 18, the second absorber 19 is respectively connected with the second condenser 17 and the third evaporator 18, the bottom of the second absorber 19 is also connected with the heat exchanger 20 through pipelines, and the heat exchanger 20 is also connected with the generator 8.
In particular, the fourth restrictor 21 is installed on the line connecting the second condenser 17 with the third evaporator 18, and the fifth restrictor 24 is installed on the line connecting the second absorber 19 with the heat exchanger 20.
In particular, in the absorption refrigeration device 6, water and lithium bromide are placed in the generator 8, and the working flow thereof is divided into two coolant cooling processes:
The high-temperature secondary refrigerant discharged from the plate heat exchanger 2 is sent into the generator 8 through the circulating pump 7, heat is transferred to the lithium bromide-water solution mixture in the generator 8, and refrigerant water with low boiling point in the lithium bromide-water solution mixture in the generator 8 is heated, evaporated and risen, enters the second condenser 17, self heat is reduced, and the primary cooling process of the secondary refrigerant is completed.
The water of the lithium bromide-water mixture in the generator 8 is evaporated and risen, and the rest lithium bromide concentrated solution firstly enters the second absorber 19 after passing through the heat exchanger 20 and the fifth throttle valve 24, and is changed into lithium bromide dilute solution in the second absorber 19, and then is sent into the heat exchanger 20 for heat exchange through the second solution pump 23;
The water vapor is absorbed by the lithium bromide solution in the second absorber 19, the concentration of the lithium bromide solution is reduced, and the solution is sent into the generator 8 through the heat exchanger 20 by the second solution pump 23, thereby forming a solution circulation.
The high-temperature coolant is discharged from the third evaporator 18 after being cooled twice in the absorption refrigeration device 6, and is continuously fed into the refrigerant circulation device, and is circulated in this way.
In particular, in the secondary coolant cooling process, in order to increase the heat exchange efficiency, a first solution pump 22 is disposed at the bottom of the third evaporator 18, for circulating the liquid water to the top of the third evaporator 18, and uniformly spraying the liquid water through the spray head to sufficiently increase the heat exchange area.
In addition, the second absorber 19 and the second condenser 17 adopt a water cooling mode, cooling water enters the second absorber 19 in a mode of entering from below and exiting from above, water discharged from the second absorber 19 enters the second condenser 17 through a pipeline, and the mode of entering the second condenser 17 is that the cooling water enters from above and exits from below, so that the recycling of the cooling water is realized.
In particular, the working flow of the refrigerant cycle device:
The high-temperature and high-pressure refrigerant coming out of the compressor 1 enters the plate heat exchanger 2, the high-temperature and high-pressure refrigerant and the secondary refrigerant exchange heat in the plate heat exchanger 2, the high-temperature and high-pressure refrigerant is condensed into high-pressure liquid refrigerant, the liquid refrigerant enters the first evaporator 5 through the throttling and depressurization component 4, absorbs heat in the first evaporator 5 to become gas, the gas low-temperature refrigerant is absorbed back to the compressor 1 after being overheated in the first evaporator 5, and is compressed again into the high-temperature and high-pressure refrigerant, the circulation process of the refrigerant is completed, and the circulation is repeated.
In particular, the throttle reducing component 4 is an expansion valve or a capillary tube, which can throttle reducing refrigerant and provide proper refrigerant flow.
In particular, when the system is abnormal, the electromagnetic valve 3 controls to cut off the supply of the liquid refrigerant, and when the system is in fault, the supply of the refrigerant is cut off, so that the whole system can be effectively protected.
In particular, the coolant is a liquid suitable for use at an ambient temperature of-50 ℃ to 50 ℃, and the coolant selected in this embodiment is ethylene glycol.
In particular, in winter, auxiliary electric heating is selected to heat the lithium bromide-water mixture in the generator 8, depending on the ambient temperature.
Particularly, the radiator is a fin radiator which is vertically arranged in the box body, and the heat exchange area is large.
In the invention, the plate heat exchanger 2 is used as the water-cooled first condenser 9, so that the heat exchange efficiency is high, the occupied space is small, and the heat-dissipating medium secondary refrigerant is liquid suitable for the ambient temperature of-50 ℃ to 50 ℃, so that the application range is wide.
It should be understood that the above description is not intended to limit the invention to the particular embodiments disclosed, but to limit the invention to the particular embodiments disclosed, and that the invention is not limited to the particular embodiments disclosed, but is intended to cover modifications, adaptations, additions and alternatives falling within the spirit and scope of the invention.
Claims (5)
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| CN210135699U (en) * | 2019-05-23 | 2020-03-10 | 青岛澳柯玛智慧冷链有限公司 | Multistage heat exchange absorption type refrigeration and heat dissipation system for built-in display cabinet |
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