CN210089172U - Partially-overlapped supercritical CO2 transcritical two-stage compression refrigeration system for commercial use and super use - Google Patents
Partially-overlapped supercritical CO2 transcritical two-stage compression refrigeration system for commercial use and super use Download PDFInfo
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- CN210089172U CN210089172U CN201920725997.5U CN201920725997U CN210089172U CN 210089172 U CN210089172 U CN 210089172U CN 201920725997 U CN201920725997 U CN 201920725997U CN 210089172 U CN210089172 U CN 210089172U
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Abstract
The utility model discloses a partial overlapping formula merchant surpasses uses CO2A transcritical two-stage compression refrigeration system. The utility model discloses a part overlapping subcooling refrigerating system refrigerant liquid loops through pipeline entering compressor, condenser, choke valve and cooling evaporator and accomplishes the refrigeration, is used for the subcooling CO2The transcritical two-stage compression refrigeration system can increase the refrigeration capacity and improve the system performance(ii) a The utility model discloses a CO2The transcritical two-stage compression refrigeration system comprises a low-temperature evaporator, a medium-temperature evaporator, a low-temperature compressor, a high-temperature compressor, a parallel compressor, a hot water heater, an air heat exchanger, a gas cooler, a cooling evaporator, a high-pressure throttle valve, an air conditioner, an intercooler, a bypass valve, a medium-pressure throttle valve and a low-pressure throttle valve. The two systems are coupled to realize the combination of various refrigerating and heating requirements of a commercial supermarket, and the problem of CO for a commercial super-refrigeration system is solved2The problem of low performance coefficient of the refrigerant, and simultaneously, the safety of the system is ensured, and the utilization efficiency of energy is effectively improved.
Description
Technical Field
The utility model relates to the field of refrigeration technology, concretely relates to partially overlapping super-cooled CO is used to commodity2A two-stage compression refrigeration system.
Background
In recent years, in order to cope with the environmental safety problem, under the joint efforts of the international society, developed countries and a part of developing countries make corresponding commitments to control ozone layer depletion and greenhouse effect, wherein the production and application of high "ODP" and high "GWP" refrigerants are strictly limited. Currently, HCFC refrigerants used in large quantities are reduced to maintenance amounts by 2030 years, and some HFC refrigerants may become intermediate products. Researchers have concluded that there are two technical approaches to solving refrigerant applications, the first being the continued development of zero "ODP" and low "GWP" artificial refrigerants (e.g., R1234yf, R1234ze), and the second being the use of natural refrigerants (e.g., NH 1234yf, R1234ze)3、 CO2Propane, water, etc.). It is well recognized that natural refrigerants, especially NH, will become the mainstream in future refrigeration applications3、CO2Refrigerants such as propane and water will be widely used in future refrigeration systems. At present, in the field of refrigeration in commercial supermarkets, CO2Transcritical pressurization systems have become the standard supermarket refrigeration solution for new equipment in some european countries.
CO2The refrigerant has the advantages and the disadvantages, the refrigerant is particularly suitable for the application conditions of the heat pump water heater, and the hot water can be realizedThe water is heated immediately, the temperature of the discharged water can reach 55-65 ℃, and even higher temperature can be realized. But the defects are very clear, the efficiency of the refrigeration system is low, the running pressure of the system is high, the problem of high running pressure can be solved by improving the pressure bearing capacity of a pressure container in the equipment processing process, but the problem of low running efficiency of the system can not be solved by the system, and CO is required to be treated2The refrigeration heat pump system is improved to improve the efficiency.
SUMMERY OF THE UTILITY MODEL
The utility model discloses the technical problem that will solve is: providing a partially overlapping type CO for business use2A transcritical two-stage compression refrigeration system solves the problems of low energy utilization rate, low system efficiency and the like in the prior art.
For solving the technical problem, the utility model discloses a following technical scheme:
partially overlapped commercial and super CO2A transcritical two-stage compression refrigeration system, characterized in that the refrigeration system comprises a partially overlapping subcooling refrigeration system and CO2A transcritical two-stage compression refrigeration system;
the partially overlapping supercooling refrigeration system is a single-stage vapor compression refrigeration system, and refrigerant liquid sequentially enters a compressor, a condenser, a throttle valve and a cooling evaporator through pipelines to finish refrigeration;
the CO is2The transcritical two-stage compression refrigeration system comprises a low-temperature evaporator, a medium-temperature evaporator, a low-temperature compressor, a high-temperature compressor, a parallel compressor, a hot water heater, an air heat exchanger, a gas cooler, a cooling evaporator, a high-pressure throttle valve, an air conditioner, an intercooler, a bypass valve, a medium-pressure throttle valve and a low-pressure throttle valve, wherein the low-temperature evaporator is connected with the low-temperature compressor in series and then connected with the medium-temperature evaporator in parallel, the parallel compressor is connected with the high-temperature compressor in parallel, the hot water heater, the air heat exchanger, the gas cooler, the cooling evaporator, the high-pressure throttle valve, the air conditioner and an intercooler inlet are sequentially connected in series, an outlet of the intercooler is connected with an air inlet of the parallel compressor throughThe intermediate-pressure throttle valve is connected in series between the intermediate-temperature evaporator and the intercooler; the refrigerant outlet of the gas cooler is connected with the refrigerant inlet of the cooling evaporator through a pipeline, the refrigerant outlet of the cooling evaporator is connected with the high-pressure throttle valve through a pipeline, and the partially-overlapped super-cooling refrigeration system and the CO are partially overlapped2The transcritical two-stage compression refrigeration systems are coupled together by the cooled evaporators.
When no special requirement exists, the low-temperature compressor sucks the refrigerant steam at the outlet of the low-temperature evaporator, the refrigerant steam is compressed to intermediate pressure in an isentropic manner, and then the refrigerant steam enters the medium-temperature compressor and is compressed to a high-temperature high-pressure overheat state in an isentropic manner; then entering the gas cooler for isobaric cooling, and adopting the partially overlapping supercooling refrigeration system to supercool the refrigerant at the outlet of the gas cooler so as to increase the refrigerating capacity; then enters the high-pressure throttle valve for adiabatic throttling, and the temperature and the pressure are reduced; then the refrigerant enters the intercooler for gas-liquid separation, because a bypass valve in one path of the flash gas bypass is in a normally closed state, all separated refrigerant saturated steam enters the parallel compressor for isentropic compression under higher pressure, and the refrigerant at the outlet of the parallel compressor and the refrigerant at the outlet of the intermediate temperature compressor are mixed and then enter the gas cooler; a part of the saturated liquid of the refrigerant separated by the intercooler is adiabatically throttled to an intermediate pressure by the intermediate-pressure throttling valve; then the refrigerant vapor enters the medium temperature evaporator to absorb heat and evaporate at equal pressure, and the evaporated refrigerant vapor is mixed with the refrigerant superheated vapor at the outlet of the low temperature compressor and enters the medium temperature compressor; and the other part of separated saturated liquid of the refrigerant passes through the low-pressure throttling valve, is subjected to adiabatic throttling to a low-temperature low-pressure state, enters the low-temperature evaporator for isobaric evaporation, and enters the low-temperature compressor again to complete circulation.
When cold and hot water supply requirements are met, the hot water heater in front of the gas cooler is started, and the refrigerant releases part of heat in the hot water heater, so that the hot water supply requirement is met.
And when cooling and space heating are required, the air heat exchanger in front of the gas cooler is started, and the refrigerant releases heat in the air heat exchanger to meet the space heating requirement.
And when the cooling and air-conditioning cooling demands exist, the air conditioner in front of the intercooler is started, and the refrigerant absorbs heat in the air conditioner to realize the air-conditioning cooling demand.
When the requirements of cooling, hot water supply and space heating are met, the hot water heater and the air heat exchanger in front of the gas cooler are started, and the refrigerant is discharged from the high-pressure compressor and sequentially passes through the hot water heater and the air heat exchanger to release heat, so that the requirements of hot water supply and space heating are met.
When the requirements of cold supply, hot water supply and air conditioner refrigeration are met, the hot water heater in front of the gas cooler and the air conditioner in front of the intercooler are started, the refrigerant is discharged from the high-pressure compressor and sequentially passes through the hot water heater, the gas cooler, the high-pressure throttle valve and the air conditioner, a part of heat is emitted from the hot water heater, a part of heat is absorbed in the air conditioner, and the requirements of hot water supply and air conditioner refrigeration are met.
Compared with the prior art, the beneficial effects of the utility model are that:
1) partial overlapping supercooling refrigerating system and parallel compressor applied to commercial supercooling refrigerating system, realized CO2The supercooling of the transcritical two-stage compression system increases the refrigerating capacity, improves the safety of the system and solves the problem of the traditional CO2The transcritical two-stage compression system has low performance coefficient, is energy-saving and environment-friendly, has obvious economic benefit and conforms to the sustainable development strategy of economy and society.
2) The utility model discloses a refrigerating system provides the evaporating temperature of two kinds of differences, is low temperature and middle temperature respectively, satisfies the different storage demands in supermarket, and integrated hot water supply, space heating system, makes supermarket system structure compacter. The integrated solution requires fewer components and less refrigerant, which helps to save space resources and facilitate maintenance and repair of the system.
3) The utility model discloses a refrigerating system can retrieve the condensation heat when cryogenic, reaches energy-conserving purpose.
4) The utility model adopts CO2The transcritical two-stage compression system solves a series of problems that the temperature of superheated steam at the end of compression is high due to overlarge pressure ratio of a single-stage compression system, so that the gas transmission coefficient, the unit refrigerating capacity, the unit volume refrigerating capacity and the refrigerating coefficient are all reduced, the power consumption of a compressor is increased, lubricating oil is carbonized and the like. The system has lower energy use cost, and the supermarket operation cost is saved.
Drawings
Fig. 1 shows a schematic diagram of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the following drawings and specific embodiments.
The utility model discloses partly superpose formula merchant and surpass and use CO2The schematic diagram of a transcritical two-stage compression refrigeration system is shown in figure 1, and the refrigeration system comprises a partially overlapping supercooling refrigeration system and CO2A transcritical two-stage compression refrigeration system.
The partially overlapping supercooling refrigeration system is a single-stage vapor compression refrigeration system, and refrigerant liquid sequentially enters the compressor 14, the condenser 15, the throttle valve 16 and the cooling evaporator 7 through pipelines to finish refrigeration;
the CO is2The transcritical two-stage compression refrigeration system comprises a low-temperature evaporator 13, a medium-temperature evaporator 11, a low-temperature compressor 1, a high-temperature compressor 2, a parallel compressor 3, a hot water heater 4, an air heat exchanger 5, a gas cooler 6, a cooling evaporator 7, a high-pressure throttle valve 8, an air conditioner 15, an intercooler 9, a bypass valve 14, a medium-pressure throttle valve 10 and a low-pressure throttle valve 12, wherein the low-temperature evaporator 13 is connected with the low-temperature compressor 1 in series and then connected with the medium-temperature evaporator 11 in parallel, the parallel compressor 3 is connected with the high-temperature compressor 2 in parallel, then the hot water heater 4, the air heat exchanger 5, the gas cooler 6, the cooling evaporator 7, the high-pressure throttle valve 8, the air conditioner 15 and the inlet of the intercooler 9 are sequentially connected in series, one way of the outlet of the intercooler 9 is connected with the air, the low-pressure throttle valve 12 is connected in seriesBetween the low temperature evaporator 13 and the intercooler 9, the medium pressure throttle valve 10 is connected in series between the medium temperature evaporator 11 and the intercooler 9; the refrigerant outlet of the gas cooler 6 is connected with the refrigerant inlet of the cooling evaporator 7 through a pipeline, the refrigerant outlet of the cooling evaporator 7 is connected with the high-pressure throttle valve 8 through a pipeline, and the super-cooling refrigeration system and the CO are partially overlapped2The transcritical two-stage compression refrigeration systems are coupled together by the cooled evaporator 7.
When no special requirement exists, the low-temperature compressor 1 sucks the refrigerant steam at the outlet of the low-temperature evaporator 13, the refrigerant steam is compressed to intermediate pressure in an isentropic manner, and then the refrigerant steam enters the medium-temperature compressor 2 to be compressed to a high-temperature high-pressure superheat state in an isentropic manner; then entering the gas cooler 6 for isobaric cooling, and adopting the partially overlapping supercooling refrigeration system to supercool the refrigerant at the outlet of the gas cooler 6 in order to increase the refrigerating capacity; then enters the high-pressure throttle valve 8 for adiabatic throttling, and the temperature and the pressure are reduced; then the refrigerant enters the intercooler 9 for gas-liquid separation, because the bypass valve 14 in one path of flash gas bypass is in a normally closed state, the separated refrigerant saturated vapor enters the parallel compressor 3 for isentropic compression under higher pressure, and the refrigerant at the outlet of the parallel compressor 3 is mixed with the refrigerant at the outlet of the intermediate temperature compressor 2 and then enters the gas cooler 6; a part of the refrigerant saturated liquid separated by the intercooler 9 is adiabatically throttled to an intermediate pressure by the intermediate-pressure throttle valve 10; then enters the medium temperature evaporator 11 for heat absorption and isobaric evaporation, and the evaporated refrigerant steam is mixed with the refrigerant superheated steam at the outlet of the low temperature compressor 1 and enters the medium temperature compressor 2; and the other part of separated saturated liquid of the refrigerant is adiabatically throttled to a low-temperature and low-pressure state by the low-pressure throttling valve 12, enters the low-temperature evaporator 13 for isobaric evaporation, and enters the low-temperature compressor 1 again to complete the cycle.
When cold and hot water supply requirements are met, the hot water heater 4 in front of the gas cooler 6 is started, and the refrigerant releases part of heat in the hot water heater 4, so that the hot water supply requirement is met.
And when cooling and space heating are required, the air heat exchanger 5 in front of the gas cooler 6 is started, and the refrigerant releases heat in the air heat exchanger 5 to meet the space heating requirement.
And when cooling and air-conditioning cooling demands exist, the air conditioner 15 in front of the intercooler 9 is started, and the refrigerant absorbs heat in the air conditioner 15 to realize the air-conditioning cooling demand.
When the requirements of cooling, hot water supply and space heating are met, the hot water heater 4 and the air heat exchanger 5 in front of the gas cooler 6 are started, and the refrigerant is discharged from the high-pressure compressor 2 and sequentially passes through the hot water heater 4 and the air heat exchanger 5 to release heat, so that the requirements of hot water supply and space heating are met.
When the cooling, hot water supply and air-conditioning refrigeration requirements are met, the hot water heater 4 in front of the gas cooler 6 and the air conditioner 15 in front of the intercooler 9 are started, the refrigerant is discharged from the high-pressure compressor and sequentially passes through the hot water heater 4, the gas cooler 6, the high-pressure throttle valve 8 and the air conditioner 15, a part of heat is discharged from the hot water heater 4, a part of heat is absorbed in the air conditioner 15, and the hot water supply and air-conditioning refrigeration requirements are met.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the principle of the present invention, and these improvements and decorations should also be regarded as the protection scope of the present invention.
Claims (1)
1. Partially overlapped commercial and super CO2The transcritical two-stage compression refrigeration system is characterized in that the partial overlapping supercooling refrigeration system and CO2A transcritical two-stage compression refrigeration system;
the partially overlapping supercooling refrigeration system is a single-stage vapor compression refrigeration system, and refrigerant liquid enters a compressor, a condenser, a throttle valve and a cooling evaporator which are connected in sequence through pipelines to finish refrigeration;
the CO is2The transcritical two-stage compression refrigerating system comprises a low-temperature evaporator, a medium-temperature evaporator and a low-temperature compressionThe system comprises a machine, a high-temperature compressor, a parallel compressor, a hot water heater, an air heat exchanger, a gas cooler, a cooling evaporator, a high-pressure throttle valve and an air conditioner, wherein the low-temperature evaporator is connected with the low-temperature compressor in series and then connected with a medium-temperature evaporator in parallel, the parallel compressor is connected with the high-temperature compressor in parallel, then the hot water heater, the air heat exchanger, the gas cooler, the cooling evaporator, the high-pressure throttle valve, the air conditioner and an inlet of an intercooler are sequentially connected in series, one path of an outlet of the intercooler is connected with an air inlet of the parallel compressor through a pipeline, the other path of the outlet of the intercooler is connected with an air inlet of the high-temperature compressor through a bypass valve, the low-pressure; the refrigerant outlet of the gas cooler is connected with the refrigerant inlet of the cooling evaporator through a pipeline, the refrigerant outlet of the cooling evaporator is connected with the high-pressure throttle valve through a pipeline, and the partially-overlapped super-cooling refrigeration system and the CO are partially overlapped2Transcritical two-stage compression refrigeration systems are coupled together by cooled evaporators.
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| CN201920725997.5U CN210089172U (en) | 2019-05-21 | 2019-05-21 | Partially-overlapped supercritical CO2 transcritical two-stage compression refrigeration system for commercial use and super use |
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| CN201920725997.5U CN210089172U (en) | 2019-05-21 | 2019-05-21 | Partially-overlapped supercritical CO2 transcritical two-stage compression refrigeration system for commercial use and super use |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110057124A (en) * | 2019-05-21 | 2019-07-26 | 天津商业大学 | A kind of part superposition type quotient is super to use CO2Trans-critical cycle double-stage compressive refrigerating system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110057124A (en) * | 2019-05-21 | 2019-07-26 | 天津商业大学 | A kind of part superposition type quotient is super to use CO2Trans-critical cycle double-stage compressive refrigerating system |
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