CN212720080U - Air conditioner circulating phase-change refrigerating system and air conditioner - Google Patents
Air conditioner circulating phase-change refrigerating system and air conditioner Download PDFInfo
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- CN212720080U CN212720080U CN202021413883.6U CN202021413883U CN212720080U CN 212720080 U CN212720080 U CN 212720080U CN 202021413883 U CN202021413883 U CN 202021413883U CN 212720080 U CN212720080 U CN 212720080U
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Abstract
The utility model discloses an air conditioner circulation phase transition refrigerating system and air conditioner, this air conditioner circulation phase transition refrigerating systemA system, comprising: a pressurized gas source; the storage tanks are respectively connected with a pressure gas source so as to alternately introduce high-pressure gas to control the pressure in the storage tanks; the air-conditioning heat exchanger is respectively connected with the storage tanks so as to alternately receive the liquid cooling medium provided by the storage tanks for heat exchange and refrigeration; the storage tank alternately receives the gaseous cooling medium after heat exchange of the air-conditioning heat exchanger and converts the gaseous cooling medium into the liquid cooling medium for cyclic utilization under the pressurization and heat exchange effects of the high-pressure gas. The utility model discloses an air conditioner circulation phase transition refrigerating system and refrigeration method thereof utilize CO2The heat effect of the liquid-gas and gas-liquid phase change is used for cooling the air conditioner heat exchanger; and a plurality of storage tanks are adopted to recycle the cooling medium, so that the continuous refrigeration requirement of the air-conditioning heat exchanger is met, and the heat exchange efficiency and the recovery efficiency of carbon dioxide are improved.
Description
Technical Field
The utility model relates to an air conditioner refrigeration technology field especially relates to an air conditioner circulation phase transition refrigerating system and air conditioner.
Background
The influence of the existing conventional refrigerants on the environment is mainly reflected in the damage to the ozone layer and the generation of greenhouse effect. The ozone layer destruction and the greenhouse effect are expressed in that the ozone content is continuously reduced and the concentration of greenhouse gases is continuously increased, which can have great influence on the living environment of human beings and even have disastrous results. Carbon dioxide is used as a natural medium, particularly has high latent heat of vaporization, so that the consumption of carbon dioxide is low, the heat exchange efficiency is high, and a refrigeration system using carbon dioxide as a secondary refrigerant is widely used and is an ideal refrigeration medium. However, the carbon dioxide transcritical cycle has the disadvantage of large throttling losses and is less efficient than a conventional refrigerant cycle. In addition, the high-pressure supercooled carbon dioxide at the outlet of the condenser can generate low-pressure carbon dioxide mixed by gas phase and liquid phase after throttling in the throttling device, and after entering the evaporator, the gaseous carbon dioxide does not evaporate and exchange heat any more and occupies a large amount of space, so that the evaporation efficiency of the liquid carbon dioxide in the evaporator is reduced, the throttling loss is large, the suction superheat degree of the compressor is increased, the power consumption is increased, and the energy efficiency of the whole compressor is reduced.
SUMMERY OF THE UTILITY MODEL
The utility model discloses the technical problem that will solve is: in order to overcome the defects in the prior art, the air conditioner circulating phase change refrigeration system and the air conditioner are provided.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
the utility model discloses a first aspect provides an air conditioner circulation phase transition refrigerating system, include:
the pressure gas source is used for providing high-pressure gas for the system;
the storage tanks are respectively connected with the pressure gas source so as to alternately introduce the high-pressure gas to control the pressure in the storage tanks;
the air-conditioning heat exchangers are respectively connected with the storage tanks so as to alternately receive the liquid cooling medium provided by the storage tanks for heat exchange and refrigeration;
the storage tank alternately receives the gaseous cooling medium subjected to heat exchange by the air-conditioning heat exchanger and converts the gaseous cooling medium into the liquid cooling medium for cyclic utilization under the pressurization and heat exchange effects of the high-pressure gas.
Further, in the air-conditioning cycle phase change refrigeration system, the system further comprises:
the spraying mechanisms are arranged at the upper part in the storage tank in a one-to-one correspondence manner, and are communicated with the lower parts of other storage tanks;
and spraying liquid cooling media in other storage tanks into the storage tank, and cooling the gaseous cooling media received in the storage tank by utilizing a throttling expansion principle to convert the gaseous cooling media into the liquid cooling media for recycling.
Further, in the air-conditioning cycle phase change refrigeration system, the system further comprises:
the built-in heat exchangers are arranged in the storage tank in a one-to-one correspondence manner; and
the ice water unit is connected with the built-in heat exchanger through control valves respectively;
so that the gaseous cooling medium received in the storage tank is converted into the liquid cooling medium for cyclic utilization under the heat exchange action of the built-in heat exchanger.
Furthermore, in the air-conditioning cycle phase-change refrigeration system, the lower parts of at least two storage tanks are communicated with each other through a pipeline and an infusion stop valve, and the pipeline is provided with a liquid inlet interface valve.
Further preferably, in the air-conditioning cycle phase-change refrigeration system, the bottoms of at least two storage tanks are respectively communicated with a sewage discharge outlet through a liquid discharge stop valve.
Further, in the air-conditioning cycle phase-change refrigeration system, the number of the storage tanks is three, and the storage tanks are arranged in parallel.
Further, in the air-conditioning cycle phase change refrigeration system, the system further comprises:
the emptying proportional valves, the safety valves and the gas phase temperature sensors are arranged at the top of the storage tank in a one-to-one correspondence mode.
Further, in the air-conditioning cycle phase change refrigeration system, the system further comprises:
the tank body pressure sensors, the electric contact type pressure gauge, the magnetic turning plate type liquid level meter and the air-cooled temperature sensor are arranged in the middle of the storage tank in a one-to-one correspondence mode.
Further, in the air-conditioning cycle phase change refrigeration system, the system further comprises:
the air source proportion regulating valves are arranged on the conveying pipelines between the pressure air source and the top of the storage tank in a one-to-one correspondence manner;
the liquid spraying proportion regulating valves are arranged on the conveying pipeline between the lower part of the storage tank and the spraying mechanism in a one-to-one correspondence manner; and
and the infusion stop valves are arranged on the conveying pipelines between the lower parts of the storage tanks and the lower parts of other storage tanks one by one.
Further, in the air-conditioning cycle phase change refrigeration system, the system further comprises:
the infusion proportion regulating valves are arranged on the conveying pipeline between the lower part of the storage tank and the air-conditioning heat exchanger in a one-to-one correspondence manner; and
and the one-way pneumatic valves are arranged on the conveying pipeline between the air-conditioning heat exchanger and the upper part of the storage tank in a one-to-one correspondence mode.
Further, in the air-conditioning cycle phase change refrigeration system, the system further comprises:
the air source temperature sensors and the air source pressure sensors are arranged on the conveying pipeline between the pressure air source and the top of the storage tank in a one-to-one correspondence manner; and
and the gasified gas temperature sensor and the gasified gas pressure sensor are arranged between the outlet of the air-conditioning heat exchanger and the upper part of the storage tank in a one-to-one correspondence manner.
Further, in the air-conditioning cycle phase-change refrigeration system, the high-pressure gas is selected from substances which are gaseous at the pressure of 0.5-7.2MPa and the temperature of more than-40 ℃ to 32 ℃.
Further preferably, in the air-conditioning cycle phase-change refrigeration system, the high-pressure gas is high-pressure air, and the pressure of the high-pressure gas is 0.5-3.4 MPa.
Further, in the air-conditioning cycle phase-change refrigeration system, the pressure air source is a high-pressure air tank or an air compressor set.
Further, in the air-conditioning circulating phase-change refrigeration system, the cooling medium is a substance capable of realizing gas-liquid phase change when the pressure is greater than 0.5MPa and the temperature is greater than minus 40 ℃.
Further preferably, in the air-conditioning cycle phase-change refrigeration system, the cooling medium is a substance capable of realizing gas-liquid phase change under the conditions that the pressure is less than 7.2MPa and the temperature is-40 ℃ to 32 DEG C
More preferably, in the air-conditioning cycle phase-change refrigeration system, the cooling medium is one or a mixture of carbon dioxide and nitrogen.
The second aspect of the present invention is to provide an air conditioner, including the above air conditioner cycle phase change refrigeration system.
The above technical scheme is adopted in the utility model, compared with the prior art, following technological effect has:
(1) by using CO2The liquid-gas and gas-liquid phase change heat effect is used for circulating refrigeration, and the throttling expansion of high-pressure liquid carbon dioxide is used for cooling the air conditioner heat exchanger, so that the heat exchanger has the characteristics of high heat exchange efficiency, high circulation efficiency, environmental friendliness and the like; the refrigerant is harmless to the environment, does not destroy the ozone layer, has the advantages of good chemical stability, non-combustibility, non-explosion, no toxicity, no smell, large latent heat of evaporation, fluidity, heat transfer performance, energy consumption and the like, and is an ideal refrigerant;
(2) the at least two storage tanks which are arranged in parallel are adopted to recycle the cooling medium, so that the continuous refrigeration requirement of the air-conditioning heat exchanger is met, and the heat exchange efficiency and the recovery efficiency of carbon dioxide are improved;
(3) in order to enhance the cooling and liquefying speed of the gaseous carbon dioxide in the recovery tank, the top of the storage tank is provided with an injection mechanism, and the gaseous carbon dioxide in the recovery tank is rapidly cooled and liquefied by utilizing the gasification latent heat of throttling expansion and the gasified low-temperature gaseous carbon dioxide, so that the gas-liquid transfer efficiency is greatly improved;
(4) the high-pressure gas is used as a power source, so that the gasified gaseous refrigerant is directly liquefied under higher pressure, and the high-pressure gas absorbs sensible heat generated when the gaseous carbon dioxide is liquefied; a refrigerant compressor requiring no high pressure;
(5) an ice water heat exchange system is arranged in each recovery storage tank, the gaseous carbon dioxide is cooled and liquefied by using low-temperature ice water provided by an ice water unit through heat exchange of a corresponding built-in heat exchanger, and simultaneously sensible heat generated when the gaseous carbon dioxide is liquefied is absorbed;
(6) the refrigeration system is provided with power compensation through a pressure air source, high-pressure air is used as a power source, the pressure in each storage tank can be rapidly adjusted, the liquid cooling medium is conveyed and circulated by using a gaseous substance according to a gas-liquid separation principle, and the energy consumption can be greatly reduced;
(7) the air conditioner circulating phase-change refrigeration system can realize various phase-change refrigeration methods according to the refrigeration demand, is suitable for different application scenes, and has the characteristic of flexible use.
Drawings
Fig. 1 is a schematic process flow diagram of an air-conditioning cycle phase-change refrigeration system with two storage tanks arranged in parallel according to the present invention;
fig. 2 is a schematic view of the process flow of the air-conditioning cycle phase-change refrigeration system with three storage tanks arranged in parallel according to the present invention.
Detailed Description
The present invention will be described in detail and specifically with reference to specific embodiments so as to provide a better understanding of the present invention, but the following embodiments do not limit the scope of the present invention.
Example 1
Referring to fig. 1, the present embodiment provides an air-conditioning cycle phase-change refrigeration system suitable for smaller refrigeration requirement, which mainly comprises a first storage tank 4, a second storage tank 5 and an air-conditioning heat exchanger 7, wherein the first storage tank 4 and the second storage tank 5 are alternately used as a liquid storage tank and a gas recovery tank for cycle operation, high-pressure air is used as high-pressure gas, and carbon dioxide is used as a cooling medium. The first storage tank 4 or the second storage tank 5 which circularly operates at intervals alternately serves as a liquid storage tank and a gas recovery tank to provide liquid carbon dioxide for the air-conditioning heat exchanger, cold energy is provided for the air-conditioning heat exchanger 7, air-conditioning refrigeration is realized, gaseous carbon dioxide which is subjected to heat exchange by the air-conditioning heat exchanger 7 is sent into the second storage tank 5 or the first storage tank 4 to be pressurized and liquefied, the collected gaseous carbon dioxide is completely converted into the liquid carbon dioxide, and then the second storage tank 5 or the first storage tank 4 serves as the liquid storage tank or the gas recovery tank to alternately operate.
Referring to fig. 1, the present embodiment provides an air conditioning cycle phase change refrigeration system, including: the pressure gas source 1 is used for providing high-pressure gas for the system, and the high-pressure gas adopts 3.3MPa high-pressure air; the device comprises a first storage tank 4 and a second storage tank 5 which are arranged in parallel, wherein the first storage tank 4 and the second storage tank 5 are respectively connected with a pressure air source 1 through pipelines so as to alternately introduce high-pressure air into the first storage tank 4 and the second storage tank 5 and regulate and control the pressure in the first storage tank 4 and the second storage tank 5; and the air-conditioning heat exchanger 7 is respectively connected with the first storage tank 4 and the second storage tank 5 so as to alternately receive the liquid cooling medium provided by the first storage tank 4 and the second storage tank 5 for heat exchange and refrigeration. The first storage tank 4 and the second storage tank 5 alternately receive the gaseous cooling medium subjected to heat exchange by the air-conditioning heat exchanger 7, and convert the gaseous cooling medium into a liquid cooling medium for cyclic utilization under the pressurization and heat exchange effects of the high-pressure gas.
Referring to fig. 1, the air conditioning cycle phase change refrigeration system further includes: a first emptying proportional valve 26, a first safety valve 29 and a first gas phase temperature sensor 32 which are correspondingly arranged at the top of each first storage tank 4; and a second evacuation proportional valve 27, a second relief valve 30 and a first gas phase temperature sensor 33 provided at the top of the second storage tank 5, respectively. The high-pressure air at the top of the first storage tank 4 and the top of the second storage tank 5 can be released respectively according to preset requirements through the first evacuation proportional valve 26 and the second evacuation proportional valve 27 so as to achieve the purpose of reducing the pressure in the tank body to a preset value, and the high-pressure air exhausted through the first evacuation proportional valve 26 and the second evacuation proportional valve 27 can also carry away part of heat, so that the system heat balance is realized to a certain extent. The arrangement of the first safety valve 29 and the second safety valve 30 prevents the pressure in the tank from exceeding the designed maximum threshold value of the tank, and plays a role in safety guarantee, specifically, when the pressure in the tank reaches the preset threshold value, the system controls the safety valves to open, and high-pressure air is discharged to the outside through the safety valves, and the first gas phase temperature sensor 32 and the first gas phase temperature sensor 33 are respectively used for monitoring the temperature of the high-pressure air in the first storage tank 4 and the second storage tank 5 in real time.
Referring to fig. 1, the air conditioning cycle phase change refrigeration system further includes: the first tank pressure sensor 35, the first electric contact pressure gauge 38, the first magnetic turning plate type liquid level meter 41 and the first air-cooled temperature sensor 44 are correspondingly arranged in the middle of the first storage tank 4 and are respectively used for monitoring the pressure, the liquid level and the temperature in the first storage tank 4 in real time; and a second tank pressure sensor 36, a second electric contact pressure gauge 39, a second magnetic flip plate type liquid level meter 42 and a second air-cooled temperature sensor 45 which are correspondingly arranged at the middle part of the second storage tank 5, and are respectively used for monitoring the pressure, the liquid level and the temperature in the first storage tank 4 and the second storage tank 5 in real time. The pressure, the liquid level and the temperature in the tank body are monitored in real time, the supply rate of a pressure air source and the rate of the tank body supplying liquid carbon dioxide to the air-conditioning heat exchanger are adjusted, and automatic conveying and recovery of carbon dioxide cooling media are achieved.
Referring to fig. 1, the air conditioning cycle phase change refrigeration system further includes: a first liquid conveying proportion regulating valve 56 which is correspondingly arranged on a conveying pipeline between the lower part of the first storage tank 4 and the air-conditioning heat exchanger 7; and a second liquid conveying proportion regulating valve 57 correspondingly arranged on a conveying pipeline between the lower part of the second storage tank 5 and the air-conditioning heat exchanger 7. The liquid carbon dioxide in the first storage tank 4 or the second storage tank 5 is sent to the air-conditioning heat exchanger 7 by the pressure of the high-pressure gas through the first liquid feed ratio adjusting valve 56 or the second liquid feed ratio adjusting valve 57, and is subjected to heat exchange and gasification in the air-conditioning heat exchanger 7.
Referring to fig. 1, the air conditioning cycle phase change refrigeration system further includes: a first one-way pneumatic valve 59 correspondingly arranged on a conveying pipeline between the air-conditioning heat exchanger 7 and the upper part of the first storage tank 4; and a second one-way pneumatic valve 60 correspondingly arranged on the conveying pipeline between the air-conditioning heat exchanger 7 and the upper part of the second storage tank 5. And the gaseous carbon dioxide after heat exchange and gasification by the air-conditioning heat exchanger 7 is respectively introduced into the first storage tank 4 or the second storage tank 5 through the first one-way pneumatic valve 59 or the second one-way pneumatic valve 60, and the first storage tank 4 or the second storage tank 5 is used as a gas recovery tank to carry out liquefaction and recycling on the gaseous carbon dioxide.
Referring to fig. 1, the air conditioning cycle phase change refrigeration system further includes: a first infusion stop valve 18 correspondingly arranged on the lower conveying pipeline of the first storage tank 4 and a second infusion stop valve 19 correspondingly arranged on the lower conveying pipeline of the second storage tank 5, wherein the first infusion stop valve 18 and the second infusion stop valve 19 are connected through a pipeline to communicate the first storage tank 4 and the second storage tank 5, so that liquid carbon dioxide in the first storage tank 4 and the second storage tank 5 mutually circulates under the pressure conveying action of high-pressure gas.
Referring to fig. 1, in the air-conditioning cycle phase-change refrigeration system, the bottom parts of the first storage tank 4 and the second storage tank 5 are respectively communicated with a sewage outlet 25 through a first liquid discharge stop valve 22 and a second liquid discharge stop valve 23 through pipelines, so that gaseous or liquid carbon dioxide in the first storage tank 4 and the second storage tank 5 is emptied when the system is not in use, and the system is convenient to overhaul and maintain.
Referring to fig. 1, the air conditioning cycle phase change refrigeration system further includes: the gas source temperature sensors 2 and the gas source pressure sensors 3 are correspondingly arranged between the pressure gas source 1 and each storage tank, the temperature and the pressure of the high-pressure gas provided by the pressure gas source 1 are monitored in real time through the gas source temperature sensors 2 and the gas source pressure sensors 3, and the control and the regulation are carried out through the gas source proportion regulating valves.
In addition, referring to fig. 1, the air conditioning cycle phase change refrigeration system further includes: and the gasification temperature sensor 6 and the gasification pressure sensor 7 are correspondingly arranged between the air-conditioning heat exchanger 7 and the storage tank, and the air-conditioning heat exchanger 7 is provided with an air-conditioning temperature sensor 5. And further comprising: a first one-way pneumatic valve 59 correspondingly arranged between the air conditioner heat exchanger 7 and the first storage tank 4 and used for controlling the receiving of the gaseous carbon dioxide; and a second one-way pneumatic valve 60 correspondingly arranged between the air-conditioning heat exchanger 7 and the second storage tank 5 and used for controlling the receiving of the gaseous carbon dioxide, wherein the gaseous carbon dioxide after heat exchange and gasification through the air-conditioning heat exchanger 7 respectively enters the first storage tank 4 or the second storage tank 5 under the control of the first one-way pneumatic valve 59 or the second one-way pneumatic valve 60, and at the moment, the circulating gas recovery tank of the first storage tank 4 or the second storage tank 5 receives the gaseous carbon dioxide, and the received gaseous carbon dioxide is pressurized and liquefied in the tank body and then is used as a liquid storage tank again.
In this embodiment, the high-pressure gas is high-pressure air, and the pressure of the high-pressure air supplied to each storage tank is 0.5-3.4 MPa. High-pressure air is provided by the pressure air source 1, and the pressure air source 1 is a high-pressure air tank or is prepared on site by adopting an air compressor unit. As a further alternative, the high pressure gas is a substance that is gaseous at a pressure of 0.5MPa to 7.2MPa and a temperature of greater than-40 ℃ to 33 ℃.
In the embodiment, the cooling medium is preferably one or a mixture of carbon dioxide and nitrogen; as other alternative embodiments, the cooling medium is a substance capable of realizing gas-liquid phase change at the pressure of more than 0.5MPa and the temperature of more than-40 ℃, and is a substance capable of realizing gas-liquid phase change at the pressure of less than 7.2MPa and the temperature of between-40 ℃ and 32 ℃.
Example 2
Referring to fig. 2, the difference from the above embodiment 1 is that this embodiment provides an air-conditioning cycle phase-change refrigeration system with three parallel tanks and suitable for small refrigeration requirement, which mainly comprises a first storage tank 4, a second storage tank 5, a third storage tank 6 and an air-conditioning heat exchanger 7, wherein the first storage tank 4, the second storage tank 5 and the third storage tank 6 are alternately used as a liquid storage tank and a gas recovery tank to operate cyclically, high-pressure air is used as high-pressure gas, and carbon dioxide is used as a cooling medium. The first storage tank 4, the second storage tank 5 or the third storage tank 6 which are operated at intervals in a circulating mode alternately serve as a liquid storage tank and a gas recovery tank to provide liquid carbon dioxide for the air-conditioning heat exchanger, cold energy is provided for the air-conditioning heat exchanger 7, air-conditioning refrigeration is achieved, gaseous carbon dioxide subjected to heat exchange through the air-conditioning heat exchanger 7 is sent into the second storage tank 5 or the third storage tank 6 to be pressurized and liquefied, collected gaseous carbon dioxide is completely converted into liquid carbon dioxide, and then the second storage tank 5 or the third storage tank 6 serves as a liquid storage tank or a gas recovery tank to operate alternately.
Referring to fig. 2, the air conditioning cycle phase change refrigeration system further includes: a first emptying proportional valve 26, a first safety valve 29 and a first gas phase temperature sensor 32 which are correspondingly arranged at the top of each first storage tank 4; and a second evacuation proportional valve 27, a second relief valve 30 and a first gas phase temperature sensor 33 provided at the top of the second storage tank 5, respectively. And further comprising: a third evacuation proportional valve 28, a third relief valve 31 and a third gas phase temperature sensor 34 provided correspondingly to the top of each of the third tanks 6. The high-pressure air at the tops of the first storage tank 4, the second storage tank 5 and the third storage tank 6 can be released respectively according to preset requirements through the first evacuation proportional valve 26, the second evacuation proportional valve 27 and the third evacuation proportional valve 28 so as to achieve the purpose of reducing the pressure in the tanks to a preset value, and the high-pressure air exhausted through the first evacuation proportional valve 26, the second evacuation proportional valve 27 and the third evacuation proportional valve 28 can also carry out partial heat, so that the system thermal balance is realized to a certain extent. The arrangement of the first safety valve 29, the second safety valve 30 and the third safety valve 31 prevents the pressure in the tank body from exceeding the designed maximum threshold value of the tank body, and plays a role in safety guarantee, specifically, when the pressure in the tank body reaches the preset threshold value, the system controls the safety valves to open, and high-pressure air is discharged to the outside through the safety valves, and the first gas phase temperature sensor 32, the first gas phase temperature sensor 33 and the third gas phase temperature sensor 34 are respectively used for monitoring the temperature of the high-pressure air in the first storage tank 4, the second storage tank 5 and the third storage tank 6 in real time.
Referring to fig. 2, the air conditioning cycle phase change refrigeration system further includes: the first tank pressure sensor 35, the first electric contact pressure gauge 38, the first magnetic turning plate type liquid level meter 41 and the first air-cooled temperature sensor 44 are correspondingly arranged in the middle of the first storage tank 4 and are respectively used for monitoring the pressure, the liquid level and the temperature in the first storage tank 4 in real time; the second tank pressure sensor 36, the second electric contact pressure gauge 39, the second magnetic turning plate type liquid level meter 42 and the second air-cooled temperature sensor 45 are correspondingly arranged in the middle of the second storage tank 5; and a third tank pressure sensor 37, a third electric contact pressure gauge 40, a third magnetic flip-flop level gauge 43, and a third air-cooled temperature sensor 46, which are disposed at the middle portion of the third storage tank 6. The device is used for monitoring the pressure, the liquid level and the temperature in the first storage tank 4, the second storage tank 5 and the third storage tank 6 in real time respectively. The pressure, the liquid level and the temperature in the tank body are monitored in real time, the supply rate of a pressure air source and the rate of the tank body supplying liquid carbon dioxide to the air-conditioning heat exchanger are adjusted, and automatic conveying and recovery of carbon dioxide cooling media are achieved.
Referring to fig. 2, the air conditioning cycle phase change refrigeration system further includes: a first liquid conveying proportion regulating valve 56 which is correspondingly arranged on a conveying pipeline between the lower part of the first storage tank 4 and the air-conditioning heat exchanger 7; and a second liquid conveying proportion regulating valve 57 correspondingly arranged on a conveying pipeline between the lower part of the second storage tank 5 and the air-conditioning heat exchanger 7; and a third liquid conveying proportion regulating valve 58 correspondingly arranged on a conveying pipeline between the lower part of the third storage tank 6 and the air-conditioning heat exchanger 7. The liquid carbon dioxide in the first storage tank 4, the second storage tank 5 or the third storage tank 6 is sent to the air-conditioning heat exchanger 7 by the pressure of high-pressure gas through the first liquid feeding ratio adjusting valve 56, the second liquid feeding ratio adjusting valve 57 or the third liquid feeding ratio adjusting valve 58, and is vaporized by heat exchange in the air-conditioning heat exchanger 7.
Referring to fig. 2, the air conditioning cycle phase change refrigeration system further includes: a first one-way pneumatic valve 59 correspondingly arranged on a conveying pipeline between the air-conditioning heat exchanger 7 and the upper part of the first storage tank 4; a second one-way pneumatic valve 60 correspondingly arranged on a conveying pipeline between the air-conditioning heat exchanger 7 and the upper part of the second storage tank 5; and a third one-way air-operated valve 61 correspondingly arranged on a conveying pipeline between the air-conditioning heat exchanger 7 and the upper part of the third storage tank 6. And the gaseous carbon dioxide after heat exchange and gasification by the air-conditioning heat exchanger 7 is respectively introduced into the first storage tank 4, the second storage tank 5 or the third storage tank 6 through the first one-way pneumatic valve 59, the second one-way pneumatic valve 60 or the third one-way pneumatic valve 61, and the first storage tank 4, the second storage tank 5 or the third storage tank 6 is used as a gas recovery tank to carry out liquefaction and recycling on the gaseous carbon dioxide.
Referring to fig. 2, the air conditioning cycle phase change refrigeration system further includes: a first infusion stop valve 18 correspondingly arranged on the lower conveying pipeline of the first storage tank 4; a second infusion stop valve 19 correspondingly arranged on the lower conveying pipeline of the second storage tank 5; and a third infusion stop valve 20 correspondingly arranged on the lower conveying pipeline of the third storage tank 6. And the first infusion stop valve 18, the second infusion stop valve 19 and the third infusion stop valve 20 are communicated with each other through pipelines to communicate the first storage tank 4, the second storage tank 5 and the third storage tank 6, so that the liquid carbon dioxide in the first storage tank 4, the second storage tank 5 and the third storage tank 6 can mutually circulate under the pressure feeding action of high-pressure gas.
Referring to fig. 2, in the air-conditioning circulating phase-change refrigeration system, the bottoms of the first storage tank 4, the second storage tank 5 and the third storage tank 6 are respectively communicated with a sewage outlet 25 through a first liquid discharge stop valve 22, a second liquid discharge stop valve 23 and a third liquid discharge stop valve 24 through pipelines, so that gaseous or liquid carbon dioxide in the first storage tank 4 and the second storage tank 5 is emptied when the system is not in use, and the system is convenient to overhaul and maintain.
Referring to fig. 1, the air conditioning cycle phase change refrigeration system further includes: the gas source temperature sensors 2 and the gas source pressure sensors 3 are correspondingly arranged between the pressure gas source 1 and each storage tank, the temperature and the pressure of the high-pressure gas provided by the pressure gas source 1 are monitored in real time through the gas source temperature sensors 2 and the gas source pressure sensors 3, and the control and the regulation are carried out through the gas source proportion regulating valves.
Example 3
Referring to fig. 1 or fig. 2, different from embodiment 1 or embodiment 2, in this embodiment, an air-conditioning cycle phase-change refrigeration system with an injection mechanism is provided, where the injection mechanism is respectively installed at an upper portion of a storage tank and is used for injecting liquid carbon dioxide into the storage tank to perform heat exchange and temperature reduction on gaseous carbon dioxide to be recovered in the storage tank, so as to improve gas-liquid phase-change conversion efficiency. The air-conditioning circulating phase-change refrigeration system can adopt the parallel arrangement of two storage tanks, so as to be suitable for air-conditioning equipment with small refrigeration quantity requirement, such as a small air conditioner and the like; or three storage tanks are arranged in parallel according to the requirement so as to be suitable for air-conditioning equipment with large refrigerating capacity refrigeration requirement, such as a central air conditioner and the like.
Referring to fig. 1 or fig. 2, specifically, unlike the above-mentioned embodiment 1 and embodiment 2, the air conditioning cycle phase change refrigeration system further includes: the first injection mechanism 11, the second injection mechanism 12 and the third injection mechanism 13 are respectively and correspondingly arranged at the upper parts in the first storage tank 4, the second storage tank 5 and the third storage tank 6, and the first injection mechanism 11, the second injection mechanism 12 and the third injection mechanism 13 all adopt annular spray plates so as to enlarge the gas-liquid contact area and improve the gas-liquid heat exchange efficiency. And the first injection mechanism 11, the second injection mechanism 12 or the third injection mechanism 13 are respectively communicated with the lower parts of other storage tanks through pipelines so as to inject liquid cooling media in the other storage tanks into the first storage tank 4, the second storage tank 5 and the third storage tank 6, and the gas cooling media received in the storage tanks are cooled and converted into the liquid cooling media for recycling by utilizing the throttling expansion principle.
In this embodiment, please refer to fig. 1 and 2, the air-conditioning cycle phase-change refrigeration system further includes: and the first spray proportion regulating valve 50, the second spray proportion regulating valve 51, the third spray proportion regulating valve 52, the fourth spray proportion regulating valve 53, the fifth spray proportion regulating valve 54 and the sixth spray proportion regulating valve 55 are correspondingly arranged on the conveying pipelines between the lower parts of the first storage tank, the second storage tank 5 and the third storage tank 6 and the corresponding first spraying mechanism 11, second spraying mechanism 12 or third spraying mechanism 13 respectively. Specifically, the first spray ratio adjusting valve 50, the third spray ratio adjusting valve 52 and the fifth spray ratio adjusting valve 54 are respectively and correspondingly disposed on the pipeline communicating the lower parts of the first tank 4, the second tank 5 and the third tank 6, and the second spray ratio adjusting valve 51, the fourth spray ratio adjusting valve 53 and the sixth spray ratio adjusting valve 55 are respectively and correspondingly disposed on the conveying pipeline communicating the first spraying mechanism 11, the second spraying mechanism 12 or the third spraying mechanism 13.
And the liquid carbon dioxide in the storage tank is pressure-fed to the injection mechanism in the other storage tank by using the high-pressure air in the storage tank as pressure-feeding power through opening or closing the corresponding liquid-jet ratio regulating valve, and is injected and gasified by the injection mechanism. As an embodiment, when the first storage tank 4 is used as a liquid storage tank and the second storage tank 5 is used as a gas recovery tank to perform the circulating phase change refrigeration on the air heat exchanger 7, the gaseous carbon dioxide after being heat exchanged and gasified by the air heat exchanger 7 needs to be liquefied again in the second storage tank 5, and in the process, the liquid carbon dioxide in the first storage tank 4 is pressure-fed to the second injection mechanism 12 through the first spray ratio adjusting valve 50 and the fourth spray ratio adjusting valve 53 through a pipeline to accelerate the liquid state of the gaseous carbon dioxide in the second storage tank 5; for another example, if necessary, the liquid carbon dioxide in the first tank 4 may be pumped to the third spraying mechanism 13 through the first spray ratio adjusting valve 50 and the sixth spray ratio adjusting valve 55 via a pipeline, so as to accelerate the liquid state of the gaseous carbon dioxide in the third tank 6, thereby improving the phase change circulation efficiency in the system.
Example 4
Referring to fig. 1 or fig. 2, different from embodiment 1, embodiment 2, or embodiment 3, the present embodiment further provides an air-conditioning circulating phase-change refrigeration system with a built-in heat exchanger, where the built-in heat exchanger is respectively installed in the middle lower portion of the storage tank and is used for providing circulating cooling water to the storage tank so as to perform heat exchange and temperature reduction on the gaseous carbon dioxide to be recovered in the storage tank, thereby improving the efficiency of gas-liquid phase-change conversion. The air-conditioning circulating phase-change refrigeration system can adopt the parallel arrangement of two storage tanks, so as to be suitable for air-conditioning equipment with small refrigeration quantity requirement, such as a small air conditioner and the like; or three storage tanks are arranged in parallel according to the requirement so as to be suitable for air-conditioning equipment with large refrigerating capacity refrigeration requirement, such as a central air conditioner and the like.
Referring to fig. 1 or fig. 2, specifically, unlike the above-mentioned embodiment 1 and embodiment 2, the air conditioning cycle phase change refrigeration system further includes: the first built-in heat exchanger 14, the second built-in heat exchanger 15 and the third built-in heat exchanger 16 are arranged in the first storage tank 4, the second storage tank 5 and the third storage tank 6 in a one-to-one correspondence mode, cooling capacity is provided for the corresponding storage tanks through the first built-in heat exchanger 14, the second built-in heat exchanger 15 and the third built-in heat exchanger 16 respectively, when each storage tank is used as a gas recovery tank, gaseous carbon dioxide received by each storage tank is cooled, conditions are created for gas-liquid phase change of the gaseous carbon dioxide, and then gaseous cooling media received by each storage tank are converted into liquid cooling media under the heat exchange effect of the corresponding built-in heat exchanger for cyclic utilization.
In addition, the air-conditioning circulating phase-change refrigeration system also comprises an external ice water unit 17, wherein the ice water unit 17 is a liquid storage tank with lower temperature and is used for providing cold energy supplement for the system, the ice water unit 17 is respectively connected with the first built-in heat exchanger 14 through a first inlet control valve 62 and a first outlet control valve 63 through pipelines, is connected with the second built-in heat exchanger 15 through a second inlet control valve 64 and a second outlet control valve 65 through pipelines, and is connected with the third built-in heat exchanger 16 through a third inlet control valve 66 and a third outlet control valve 67 through pipelines to respectively provide cooling water for the built-in heat exchangers.
Application example 1
The application embodiment provides an air-conditioning circulating phase-change refrigeration method with smaller refrigeration capacity requirement, which adopts an air-conditioning circulating phase-change refrigeration system with two tanks arranged in parallel and specifically comprises the following steps:
s1, filling liquid carbon dioxide into the first storage tank 4 to 70%, and filling solid or liquid carbon dioxide into the second storage tank 5 to 10%;
s2, starting the pressure air source 1, respectively introducing high-pressure air into the first storage tank 4 and the second storage tank 5, and respectively keeping the pressure in the first storage tank 4 at 30kg/cm2The pressure in the second storage tank 5 is not lower than 8kg/cm2；
S3, taking the first storage tank 4 as a liquid storage tank, opening a first infusion proportion regulating valve 56 between the first storage tank 4 and the air-conditioning heat exchanger 7, enabling liquid carbon dioxide in the first storage tank 4 to enter the air-conditioning heat exchanger 7 under the pressure action of high-pressure air for heat absorption, temperature rise and gasification, and controlling the temperature of gaseous carbon dioxide flowing out of the air-conditioning heat exchanger 7 to be not lower than-4 ℃ through the first infusion proportion regulating valve 56;
s4, when the pressure in the air conditioner 7 reaches 25kg/cm2When the gas is in use, the second one-way pneumatic valve 60 between the air-conditioning heat exchanger 7 and the second storage tank 5 is opened, so that the gasified gaseous carbon dioxide flows into the second storage tank 5, and the second storage tank 5 is used as a gas recovery tank;
s5, when the pressure in the second storage tank 5 reaches 25kg/cm2When the carbon dioxide is not supplied to the air-conditioning heat exchanger 7, the second one-way pneumatic valve 60 between the air-conditioning heat exchanger 7 and the second storage tank 5 is closed, and the liquid carbon dioxide is not supplied to the air-conditioning heat exchanger 7; and after the second unidirectional air-operated valve 60 between the air-conditioning heat exchanger 7 and the second storage tank 5 is closed, high-pressure air is introduced into the second storage tank 5 and the pressure in the second storage tank 5 is kept at 33kg/cm2The pressure is increased and liquefied, the heated air is discharged through the second evacuation proportional valve 27 to take away the heat absorbed by the system, and the pressure in the second storage tank 5 is controlled to be stable through the second evacuation proportional valve 27 in the process; liquid carbon dioxide can be sprayed into the second storage tank 5 through the second spraying mechanism 15 according to needs, or the temperature of gaseous carbon dioxide in the second storage tank 5 is accelerated through the second built-in heat exchanger, so that a liquefaction condition is created;
and S6, when the temperature of the gas in the second storage tank 5 is-2 ℃, the second storage tank 5 is used as a liquid storage tank to provide liquid carbon dioxide for the air-conditioning heat exchanger 7, the first storage tank 4 is used as a gas recovery tank to receive the gaseous carbon dioxide after heat exchange of the air-conditioning heat exchanger 7, and the liquefaction process is repeated.
Application example 2
The application embodiment provides an air-conditioning circulating phase-change refrigeration method with smaller refrigeration capacity requirement, which adopts an air-conditioning circulating phase-change refrigeration system with three tanks arranged in parallel, and specifically comprises the following steps:
s1, filling liquid carbon dioxide into the first storage tank 4 to 90%, filling solid or liquid carbon dioxide into the second storage tank 5 to 10%, and filling solid or liquid carbon dioxide into the third storage tank 6 to 10%;
s2, starting the pressure air source 1, respectively introducing high-pressure air into the first storage tank 4, the second storage tank 5 and the third storage tank 6, and respectively keeping the pressure in the first storage tank 4 at 30kg/cm2The pressure in the second storage tank 5 is not lower than 8kg/cm2And the pressure in the third storage tank 6 is not less than 8kg/cm2；
S3, taking the first storage tank 4 as a liquid storage tank, opening a first infusion proportion regulating valve 56 between the first storage tank 4 and the air-conditioning heat exchanger 7, enabling liquid carbon dioxide in the first storage tank 4 to enter the air-conditioning heat exchanger 7 under the pressure action of high-pressure air for heat absorption, temperature rise and gasification, and controlling the temperature of gaseous carbon dioxide flowing out of the air-conditioning heat exchanger 7 to be not lower than-4 ℃ through the first infusion proportion regulating valve 56;
s4, when the pressure in the air conditioner 7 reaches 25kg/cm2When the gas is in use, the second one-way pneumatic valve 60 between the air-conditioning heat exchanger 7 and the second storage tank 5 is opened, so that the gasified gaseous carbon dioxide flows into the second storage tank 5, and the second storage tank 5 is used as a gas recovery tank;
s5, when the pressure in the second storage tank 5 reaches 25kg/cm2When the gas state carbon dioxide flows into the third storage tank 6, the third one-way pneumatic valve 61 between the air-conditioning heat exchanger 7 and the third storage tank 6 is opened, and the second one-way pneumatic valve 60 between the air-conditioning heat exchanger 7 and the second storage tank 5 is closed; after the second one-way pneumatic valve 60 between the air-conditioning heat exchanger 7 and the second storage tank 5 is closed, high-pressure air is introduced into the second storage tank 5 and the tank body pressure is kept at 33kg/cm2Pressurizing and liquefying;
s6, when the temperature of the gas in the second storage tank 5 is-2 ℃, the liquefied liquid carbon dioxide in the second storage tank 5 is sent back to the first storage tank 4 through high-pressure gas pressure;
s7, when the second magnetic turning plate type liquid level meter 42 displays the lower point, the pressure feeding process is finished, the second storage tank 5 is used as a gas recovery tank again, and meanwhile, the third storage tank 6 repeats the liquefaction process; the second storage tank 5 and the third storage tank 6 are alternately used as gas recovery tanks to continuously supply the liquid carbon dioxide to the first storage tank 4.
Application example 3
The application embodiment provides an air conditioner circulating phase-change refrigeration method with large refrigeration capacity requirement, for example, an air conditioner circulating phase-change refrigeration system with three tanks arranged in parallel is adopted to provide circulating refrigeration capacity for a central air conditioner, and the method specifically comprises the following steps:
s1, filling liquid carbon dioxide into the first storage tank 4 to 90%, filling solid or liquid carbon dioxide into the second storage tank 5 to 10%, and filling solid or liquid carbon dioxide into the third storage tank 6 to 10%;
s2, starting the pressure air source 1, respectively introducing high-pressure air into the first storage tank 4, the second storage tank 5 and the third storage tank 6, and respectively keeping the pressure in the first storage tank 4 at 30kg/cm2The pressure in the second storage tank 5 is not lower than 8kg/cm2And the pressure in the third storage tank 6 is not less than 8kg/cm2；
S3, taking the first storage tank 4 as a liquid storage tank, opening a first liquid conveying proportion regulating valve 56 between the first storage tank 4 and the air-conditioning heat exchanger 7, enabling liquid carbon dioxide in the first storage tank 4 to enter the air-conditioning heat exchanger 7 under the pressure action of high-pressure air for heat absorption, temperature rise and gasification, and controlling the temperature of gaseous carbon dioxide flowing out of the air-conditioning heat exchanger 7 to be-4 ℃ through the first liquid conveying proportion regulating valve 56;
s4, when the pressure in the cavity of the air conditioner 7 reaches 25kg/cm2When the gas recovery system is used, a second one-way pneumatic valve 60 between the air-conditioning heat exchanger 7 and the second storage tank 5 is opened, so that the gasified gaseous carbon dioxide flows into the second storage tank 5, and the second storage tank 5 is used as a gas recovery tank;
s5, when the pressure in the second storage tank 5 reaches 18kg/cm2When the liquid spraying proportion adjusting valve between the first storage tank 4 and the second spraying mechanism 12 in the second storage tank 5 is opened, liquid carbon dioxide is sprayed into the second storage tank 5 for gasification and heat absorption;
s6, when the second magnetic turning plate type liquid level meter 42 in the second storage tank 5 shows the upper position point, the first storage tank 4 is taken as the gas recovery tank, and the second storage tank 5 is taken as the liquid storage tank, and the steps S3-S5 are repeated;
s7, when the pressure in the second storage tank 5 reaches 25kg/cm2And the second magnetic flap type level gauge 42 does not show the arrival at the upper position, the third storage tank 6 is started as the gas recovery tank and the process of S1-S5 is repeated while increasing the pressure in the second storage tank 5 to 32kg/cm2；
S8, when the gas temperature in the second storage tank 5 is-3 ℃, the liquid carbon dioxide in the second storage tank 5 is pumped to the first storage tank 4 by high-pressure gas, and the pumping is stopped when the liquid level shows the lower position; at this time, the second tank 5 is switched to the reserve tank and the third tank 6 is circulated to perform steps S7-S8.
Application example 4
The application embodiment provides an air conditioner circulating phase-change refrigeration method with moderate refrigeration capacity requirement, for example, an air conditioner circulating phase-change refrigeration system with two parallel tanks is adopted to provide circulating refrigeration capacity for a household air conditioner, and the method specifically comprises the following steps:
s1, filling liquid carbon dioxide into the first storage tank 4 to 90%, filling solid or liquid carbon dioxide into the second storage tank 5 to 10%, and filling solid or liquid carbon dioxide into the third storage tank 6 to 10%;
s2, starting the pressure air source 1, respectively introducing high-pressure air into the first storage tank 4, the second storage tank 5 and the third storage tank 6, and respectively keeping the pressure in the first storage tank 4 at 30kg/cm2The pressure in the second storage tank 5 is not lower than 8kg/cm2And the pressure in the third storage tank 6 is not less than 8kg/cm2；
S3, taking the first storage tank 4 as a liquid storage tank, opening a first infusion proportion regulating valve 56 between the first storage tank 4 and the air-conditioning heat exchanger 7, enabling liquid carbon dioxide in the first storage tank 4 to enter the air-conditioning heat exchanger 7 under the pressure action of high-pressure air for heat absorption, temperature rise and gasification, and controlling the temperature of gaseous carbon dioxide flowing out of the air-conditioning heat exchanger 7 to be not lower than-4 ℃ through the first infusion proportion regulating valve 56;
s4, opening the second unidirectional pneumatic valve 60 between the air conditioner heat exchanger 7 and the second storage tank 5, making the gasified gaseous carbon dioxide flow into the second storage tank 5, and using the second storage tank 5 as a gas recovery tank; at the same time, the ice water unit 17 faces the second insideThe heat exchanger 15 provides circulating ice water with the temperature of-20 ℃ to cool the gaseous carbon dioxide, and the second emptying proportional valve 27 is adjusted to control the pressure in the second storage tank 5 to be not more than 25kg/cm2Completely converting the gaseous carbon dioxide into liquid carbon dioxide;
s5, when the second magnetic turning plate type liquid level meter 42 in the second storage tank 5 does not show to reach the upper point, the second one-way pneumatic valve 60 is closed, the second storage tank 5 stops receiving the gaseous carbon dioxide, the second storage tank 5 is converted into a liquid storage tank to provide the liquid carbon dioxide, and the first storage tank 4 is converted into a gas recovery tank;
s6, the above steps S3-S5 are repeated with the second storage tank 5 as the liquid storage tank and the first storage tank 4 as the gas recovery tank.
Application example 5
The application embodiment provides another air conditioner circulating phase-change refrigeration method with moderate refrigerating capacity demand, which adopts an air conditioner circulating phase-change refrigeration system with three tanks arranged in parallel, and specifically comprises the following steps:
s1, filling liquid carbon dioxide into the first storage tank 4 to 90%, filling solid or liquid carbon dioxide into the second storage tank 5 to 10%, and filling solid or liquid carbon dioxide into the third storage tank 6 to 10%;
s2, starting the pressure air source 1, respectively introducing high-pressure air into the first storage tank 4, the second storage tank 5 and the third storage tank 6, and respectively keeping the pressure in the first storage tank 4 at 30kg/cm2The pressure in the second storage tank 5 is not lower than 8kg/cm2And the pressure in the third storage tank 6 is not less than 8kg/cm2；
S3, taking the first storage tank 4 as a liquid storage tank, opening a first liquid discharge ratio adjusting valve 56 between the first storage tank 4 and the air-conditioning heat exchanger 7, enabling liquid carbon dioxide in the first storage tank 4 to enter the air-conditioning heat exchanger 7 under the pressure action of high-pressure air for heat absorption, temperature rise and gasification, and controlling the temperature of gaseous carbon dioxide flowing out of the air-conditioning heat exchanger 7 to be not lower than-4 ℃ through the first liquid discharge ratio adjusting valve 56;
s4, opening the second unidirectional pneumatic valve 60 between the air conditioner heat exchanger 7 and the second storage tank 5, making the gasified gaseous carbon dioxide flow into the second storage tank 5, and using the second storage tank 5 as a gas recovery tank; meanwhile, the water chilling unit 17 provides circulating ice water with the temperature of-20 ℃ to the second built-in heat exchanger 15 to cool the gaseous carbon dioxide, so that the gaseous carbon dioxide is completely converted into liquid carbon dioxide;
s5, when the pressure in the second storage tank 5 reaches 25kg/cm2When the second magnetic turning plate type liquid level meter 42 does not show that the upper point is reached, the second one-way pneumatic valve 60 is closed, the third one-way pneumatic valve 61 between the air-conditioning heat exchanger 7 and the third storage tank 6 is opened, so that the gasified gas carbon dioxide flows into the third storage tank 6, and the third storage tank 6 is used as a gas recovery tank; meanwhile, the ice water unit 17 continues to provide circulating ice water at the temperature of-20 ℃ by the second built-in heat exchanger 15 so as to cool the gaseous carbon dioxide in the second storage tank 5, so that the gaseous carbon dioxide is completely converted into liquid carbon dioxide;
s6, the first storage tank 4, the second storage tank 5 and the third storage tank 6 are used as liquid storage tanks or gas recovery tanks in turn, and the steps S3-S5 are repeated.
Application example 6
The application embodiment provides an air-conditioning circulating phase-change refrigeration method with relatively moderate refrigeration capacity requirement, for example, a public central air-conditioning provides circulating refrigeration capacity, and the method adopts an air-conditioning circulating phase-change refrigeration system with three tanks arranged in parallel, and specifically comprises the following steps:
s1, filling the first storage tank 4 with liquid carbon dioxide to 90%, the second storage tank 5 with liquid carbon dioxide to 10%, and the third storage tank 6 with liquid carbon dioxide to 10%;
s2, starting the pressure air source 1, respectively introducing high-pressure air into the first storage tank 4, the second storage tank 5 and the third storage tank 6, and respectively keeping the pressure in the first storage tank 4 at 30kg/cm2The pressure in the second storage tank 5 is not lower than 8kg/cm2And the pressure in the third storage tank 6 is not less than 8kg/cm2；
S3, taking the first storage tank 4 as a liquid storage tank, opening a first liquid discharge ratio adjusting valve 56 between the first storage tank 4 and the air-conditioning heat exchanger 7, enabling liquid carbon dioxide in the first storage tank 4 to enter the air-conditioning heat exchanger 7 under the pressure action of high-pressure air for heat absorption, temperature rise and gasification, and controlling the temperature of gaseous carbon dioxide flowing out of the air-conditioning heat exchanger 7 to be not lower than-4 ℃ through the first liquid discharge ratio adjusting valve 56;
s4, opening the second unidirectional pneumatic valve 60 between the air conditioner heat exchanger 7 and the second storage tank 5, making the gasified gaseous carbon dioxide flow into the second storage tank 5, and using the second storage tank 5 as a gas recovery tank; meanwhile, the water chilling unit 17 provides circulating ice water with the temperature of-20 ℃ to the second built-in heat exchanger 15 to cool the gaseous carbon dioxide, so that the gaseous carbon dioxide is completely converted into liquid carbon dioxide;
s5, when the pressure in the second storage tank 5 reaches 25kg/cm2When the second magnetic turning plate type liquid level meter 42 does not reach the upper point, the second one-way pneumatic valve 60 is closed, the third one-way pneumatic valve 61 between the air-conditioning heat exchanger 7 and the third storage tank 6 is opened, and gaseous carbon dioxide is introduced into the third storage tank 6; simultaneously starting the pressure air source 1 to introduce high-pressure air into the second storage tank 5, increasing the pressure and keeping the pressure in the second storage tank 5 at 30kg/cm2Opening a liquid spraying proportion regulating valve between the first storage tank 4 and the second spraying mechanism 12, spraying the liquid carbon dioxide in the first storage tank 4 into the second storage tank 5 and gasifying the liquid carbon dioxide;
s6, when the temperature of the gaseous carbon dioxide in the second storage tank 5 is reduced to-5 ℃, the gaseous carbon dioxide is converted into a liquid state, the spraying of the liquid carbon dioxide into the second storage tank 5 is stopped, the second storage tank 5 serves as a liquid storage tank to provide the liquid carbon dioxide, and the third storage tank 6 serves as a gas recovery tank to receive the gaseous carbon dioxide;
s7, when the pressure in the third storage tank 6 reaches 25kg/cm2When the third magnetic turning plate type liquid level meter does not show that the third magnetic turning plate type liquid level meter reaches the upper point, the third one-way pneumatic valve 61 is closed, the first one-way pneumatic valve between the air-conditioning heat exchanger 7 and the third storage tank 6 is opened, and gaseous carbon dioxide is introduced into the first storage tank 4; simultaneously starting the pressure air source 1 to introduce high-pressure air into the third storage tank 6, increasing the pressure and keeping the pressure in the third storage tank 6 at 30kg/cm2Opening a liquid spraying proportion regulating valve between the second storage tank 5 and the third spraying mechanism 13, spraying the liquid carbon dioxide in the second storage tank 5 into the third storage tank 6 and gasifying the liquid carbon dioxide;
s8, when the temperature of the gaseous carbon dioxide in the third storage tank 6 is reduced to-5 ℃, the gaseous carbon dioxide is converted into a liquid state, the liquid carbon dioxide is stopped being sprayed into the third storage tank 6, the third storage tank 6 serves as a liquid storage tank to provide the liquid carbon dioxide, and the first storage tank 4 serves as a gas recovery tank to receive the gaseous carbon dioxide;
s9, the above steps S3-S5 are repeated with the first tank 4, the second tank 5 and the third tank 6 alternately functioning as a liquid storage tank and a gas recovery tank in this order.
Application example 7
The application embodiment provides another air conditioner circulating phase-change refrigeration method with relatively moderate refrigeration capacity requirement, for example, a public central air conditioner provides circulating refrigeration capacity, and the method adopts an air conditioner circulating phase-change refrigeration system with three tanks arranged in parallel, and specifically comprises the following steps:
s1, filling liquid carbon dioxide into the first storage tank 4 to 90%, filling solid or liquid carbon dioxide into the second storage tank 5 to 10%, and filling solid or liquid carbon dioxide into the third storage tank 6 to 10%;
s2, starting the pressure air source 1, respectively introducing high-pressure air into the first storage tank 4, the second storage tank 5 and the third storage tank 6, and respectively keeping the pressure in the first storage tank 4 at 30kg/cm2The pressure in the second storage tank 5 is not lower than 8kg/cm2And the pressure in the third storage tank is not less than 8kg/cm2；
S3, taking the first storage tank 4 as a liquid storage tank, opening a first liquid discharge ratio adjusting valve 56 between the first storage tank 4 and the air-conditioning heat exchanger 7, enabling liquid carbon dioxide in the first storage tank 4 to enter the air-conditioning heat exchanger 7 under the pressure action of high-pressure air for heat absorption, temperature rise and gasification, and controlling the temperature of gaseous carbon dioxide flowing out of the air-conditioning heat exchanger 7 to be-4 ℃ through the first liquid discharge ratio adjusting valve 56;
s4, opening the second unidirectional pneumatic valve 60 between the air conditioner heat exchanger 7 and the second storage tank 5, making the gasified gaseous carbon dioxide flow into the second storage tank 5, and using the second storage tank 5 as a gas recovery tank; meanwhile, the water chilling unit 17 provides circulating ice water with the temperature of-20 ℃ to the second built-in heat exchanger 15 so as to cool the gas carbon dioxide in the second storage tank 5, so that the gas carbon dioxide is converted into liquid carbon dioxide;
s5, when in the second storage tank 5Pressure of up to 25kg/cm2And when the second magnetic flip plate type liquid level meter 42 does not show that the upper point is reached, the second one-way pneumatic valve 60 is closed; starting the pressure air source 1 to introduce high-pressure air into the second storage tank 5, increasing the pressure and keeping the pressure in the second storage tank 5 at 30kg/cm2Opening a liquid spraying proportion regulating valve between the first storage tank 4 and the second spraying mechanism 12, spraying the liquid carbon dioxide in the first storage tank 4 into the second storage tank 5 and gasifying the liquid carbon dioxide;
s6, when the temperature of the gaseous carbon dioxide is reduced to-10 ℃, the gaseous carbon dioxide is converted into liquid, and the spraying of the liquid carbon dioxide into the second storage tank 5 is stopped; simultaneously opening a stop valve between the second storage tank 5 and the third storage tank 6 to enable the liquid carbon dioxide in the second storage tank 5 to flow into the third storage tank 6 until the second magnetic turning plate type liquid level meter 42 displays a lower point;
s7, the third storage tank 6 is used as a liquid storage tank to provide liquid carbon dioxide, the first storage tank 4 is used as a gas recovery tank to receive gaseous carbon dioxide, and the second storage tank 5 is used as a liquid storage tank to receive liquefied liquid carbon dioxide recovered by the first storage tank 4, and the above steps S3-S6 are repeated.
In the above application example, in step S1, the filling amount of the liquid carbon dioxide in the first storage tank 4 is 10-100%, preferably 40-100%, and more preferably 70-90% of the volume thereof according to the actual refrigeration requirement; the filling amount of the liquid or solid carbon dioxide in the second storage tank 5 is 0-20%, preferably 5-20%, and more preferably 10-15% of the volume of the second storage tank; and the third tank 6 is filled with liquid or solid carbon dioxide in an amount of 0 to 20%, preferably 5 to 20%, more preferably 10 to 15% of its volume. The amount of carbon dioxide charged into each tank at the initial time is not limited to the above embodiment, and only the amount of carbon dioxide charged into the first tank 4, the second tank 5, and the third tank 6 may be sufficient for single cycle use.
The above detailed description of the embodiments of the present invention is only for exemplary purposes, and the present invention is not limited to the above described embodiments. Any equivalent modifications and substitutions to those skilled in the art are also within the scope of the present invention. Accordingly, variations and modifications in equivalents may be made without departing from the spirit and scope of the invention, which is intended to be covered by the following claims.
Claims (18)
1. An air conditioning cycle phase change refrigeration system, comprising:
the pressure gas source is used for providing high-pressure gas for the system;
the storage tanks are respectively connected with the pressure gas source so as to alternately introduce the high-pressure gas to control the pressure in the storage tanks;
the air-conditioning heat exchangers are respectively connected with the storage tanks so as to alternately receive the liquid cooling medium provided by the storage tanks for heat exchange and refrigeration;
the storage tank alternately receives the gaseous cooling medium subjected to heat exchange by the air-conditioning heat exchanger and converts the gaseous cooling medium into the liquid cooling medium for cyclic utilization under the pressurization and heat exchange effects of the high-pressure gas.
2. The air conditioning cycle phase change refrigeration system of claim 1, further comprising:
the spraying mechanisms are arranged at the upper part in the storage tank in a one-to-one correspondence manner, and are communicated with the lower parts of other storage tanks;
and spraying liquid cooling media in other storage tanks into the storage tank, and cooling the gaseous cooling media received in the storage tank by utilizing a throttling expansion principle to convert the gaseous cooling media into the liquid cooling media for recycling.
3. The air conditioning cycle phase change refrigeration system of claim 1, further comprising:
the built-in heat exchangers are arranged in the storage tank in a one-to-one correspondence manner; and
the ice water unit is connected with the built-in heat exchanger through control valves respectively;
so that the gaseous cooling medium received in the storage tank is converted into the liquid cooling medium for cyclic utilization under the heat exchange action of the built-in heat exchanger.
4. The air-conditioning cycle phase-change refrigeration system as claimed in claim 1, wherein the lower parts of at least two storage tanks are communicated with each other through a pipeline and an infusion stop valve, and the pipeline is provided with an inlet port valve.
5. The air-conditioning cycle phase-change refrigeration system as claimed in claim 4, wherein the bottoms of at least two storage tanks are respectively communicated with a sewage discharge outlet through a liquid discharge stop valve.
6. The air conditioning cycle phase change refrigeration system of claim 1, wherein the number of storage tanks is three and arranged in parallel.
7. The air conditioning cycle phase change refrigeration system of claim 1, further comprising:
the emptying proportional valves, the safety valves and the gas phase temperature sensors are arranged at the top of the storage tank in a one-to-one correspondence mode.
8. The air conditioning cycle phase change refrigeration system of claim 1, further comprising:
the tank body pressure sensors, the electric contact type pressure gauge, the magnetic turning plate type liquid level meter and the air-cooled temperature sensor are arranged in the middle of the storage tank in a one-to-one correspondence mode.
9. The air conditioning cycle phase change refrigeration system of claim 1, further comprising:
the air source proportion regulating valves are arranged on the conveying pipelines between the pressure air source and the top of the storage tank in a one-to-one correspondence manner;
the liquid spraying proportion regulating valves are arranged on the conveying pipeline between the lower part of the storage tank and the spraying mechanism in a one-to-one correspondence manner; and
and the infusion stop valves are arranged on the conveying pipelines between the lower parts of the storage tanks and the lower parts of other storage tanks one by one.
10. The air conditioning cycle phase change refrigeration system of claim 1, further comprising:
the infusion proportion regulating valves are arranged on the conveying pipeline between the lower part of the storage tank and the air-conditioning heat exchanger in a one-to-one correspondence manner; and
and the one-way pneumatic valves are arranged on the conveying pipeline between the air-conditioning heat exchanger and the upper part of the storage tank in a one-to-one correspondence mode.
11. The air conditioning cycle phase change refrigeration system of claim 1, further comprising:
the air source temperature sensors and the air source pressure sensors are arranged on the conveying pipeline between the pressure air source and the top of the storage tank in a one-to-one correspondence manner; and
and the gasified gas temperature sensor and the gasified gas pressure sensor are arranged between the outlet of the air-conditioning heat exchanger and the upper part of the storage tank in a one-to-one correspondence manner.
12. The air conditioning cycle phase change refrigeration system of claim 1, wherein the high pressure gas is selected from the group consisting of substances that are gaseous at a pressure of 0.5-7.2MPa and a temperature of greater than-40 ℃ to 32 ℃.
13. The air conditioning cycle phase change refrigeration system of claim 12, wherein the high pressure gas is high pressure air having a pressure of 0.5-3.4 MPa.
14. The air conditioning cycle phase change refrigeration system of claim 1, wherein the pressurized air source is a high pressure air tank or an air compressor unit.
15. The air-conditioning cycle phase change refrigeration system as claimed in claim 1, wherein the cooling medium is a substance capable of realizing gas-liquid phase change under the pressure of more than 0.5MPa and the temperature of more than-40 ℃.
16. An air conditioning cycle phase change refrigeration system as claimed in claim 15, wherein the cooling medium is a substance capable of effecting a phase change between gas and liquid at a pressure of less than 7.2MPa and a temperature of between-40 ℃ and 32 ℃.
17. The air conditioning cycle phase change refrigeration system of claim 16, wherein the cooling medium is one or a mixture of carbon dioxide and nitrogen.
18. An air conditioner characterized by comprising the air conditioning cycle phase change refrigeration system as claimed in any one of claims 1 to 17.
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| WO2023030544A1 (en) * | 2021-09-06 | 2023-03-09 | 上海复璐帝流体技术有限公司 | Carbon dioxide refrigerant gas pressurized circulation system, circulation method, and cooling and heating air conditioner |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2023030544A1 (en) * | 2021-09-06 | 2023-03-09 | 上海复璐帝流体技术有限公司 | Carbon dioxide refrigerant gas pressurized circulation system, circulation method, and cooling and heating air conditioner |
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