CN113970192A - Carbon dioxide refrigerant pressurizing circulation heating system and method and air conditioner heater - Google Patents

Carbon dioxide refrigerant pressurizing circulation heating system and method and air conditioner heater Download PDF

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Publication number
CN113970192A
CN113970192A CN202111038264.2A CN202111038264A CN113970192A CN 113970192 A CN113970192 A CN 113970192A CN 202111038264 A CN202111038264 A CN 202111038264A CN 113970192 A CN113970192 A CN 113970192A
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carbon dioxide
refrigerant
pressure
gaseous
temperature
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杨景峰
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Priority to PCT/CN2022/117403 priority patent/WO2023030544A1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B9/00—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point
    • F25B9/002—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point characterised by the refrigerant
    • F25B9/008—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point characterised by the refrigerant the refrigerant being carbon dioxide
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/0007—Indoor units, e.g. fan coil units
    • F24F1/0059—Indoor units, e.g. fan coil units characterised by heat exchangers
    • F24F1/0063—Indoor units, e.g. fan coil units characterised by heat exchangers by the mounting or arrangement of the heat exchangers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/06—Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger
    • F24F1/08—Compressors specially adapted for separate outdoor units
    • F24F1/10—Arrangement or mounting thereof
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/06—Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger
    • F24F1/14—Heat exchangers specially adapted for separate outdoor units
    • F24F1/16—Arrangement or mounting thereof
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F24F11/41—Defrosting; Preventing freezing
    • F24F11/42—Defrosting; Preventing freezing of outdoor units
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63—Electronic processing
    • F24F11/64—Electronic processing using pre-stored data
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/30—Expansion means; Dispositions thereof
    • F25B41/31—Expansion valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Thermal Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Signal Processing (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Fuzzy Systems (AREA)
  • Mathematical Physics (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)

Abstract

The invention discloses a carbon dioxide refrigerant pressurizing circulation heating system and a method thereof and an air conditioner heater, wherein the heating system comprises: the refrigerant circulating tank is used for providing a liquid high-pressure normal-temperature carbon dioxide refrigerant for the system; the outdoor evaporator is connected with the refrigerant circulating tank through an expansion valve and a reversing valve; the gas carbon dioxide refrigerant supercharger is connected with the outdoor evaporator; and the indoor condenser is connected with the gaseous carbon dioxide refrigerant supercharger and is used for completing the liquefaction of the gaseous high-temperature high-pressure carbon dioxide refrigerant and realizing the heating of the secondary refrigerant. The invention utilizes the gas carbon dioxide refrigerant supercharger to carry out gas pressurization and temperature rise under the temperature and pressure that the carbon dioxide is in a gas state, simultaneously realizes the cooling and liquefaction of the gas high-temperature high-pressure carbon dioxide refrigerant through the indoor condenser, releases heat in the liquefaction process, and the secondary refrigerant absorbs heat and rises temperature to finish the heating purpose.

Description

Carbon dioxide refrigerant pressurizing circulation heating system and method and air conditioner heater
Technical Field
The invention relates to the technical field of air conditioner heating, in particular to a carbon dioxide refrigerant pressurizing circulation heating system and method and an air conditioner heater.
Background
The manual heating mode mainly comprises four modes, namely phase-change heating, gas expansion heating, vortex tube heating and thermoelectric heating. Each heating method has its own features. A reasonable heating method is selected, the heating requirement is met, energy conservation in heating is realized, good economic benefit is achieved, and meanwhile, a heating system meets the environment-friendly requirement. The air energy phase change heating technology is that the liquid refrigerant is gasified into a gaseous refrigerant with a certain superheat degree by absorbing the environmental heat, the gaseous low-temperature refrigerant is pressurized into a high-pressure high-temperature refrigerant, the high-pressure high-temperature gaseous refrigerant is liquefied after releasing sensible heat and latent heat, and the secondary refrigerant absorbs the heat released when the gaseous refrigerant is liquefied to heat, so that the heating of the secondary refrigerant is completed.
Carbon dioxide is a new natural working medium. The liquid carbon dioxide evaporation point was-56.6 ℃ and the pressure was 520 kPa. Carbon dioxide has many unique advantages as a heating working medium: from the viewpoint of the influence on the environment, carbon dioxide is the most environment-friendly heating working medium except water and air. The carbon dioxide has good safety and chemical stability, is safe and nontoxic, does not generate harmful gas even at high temperature, has thermophysical properties suitable for heating circulation and equipment, and has quite high heating capacity per unit volume and low kinematic viscosity.
Therefore, latent heat and sensible heat need to be released to heat the secondary refrigerant when carbon dioxide is changed from a gas state to a liquid state, the secondary refrigerant needs to absorb environmental heat to be changed into a medium-pressure low-temperature refrigerant when the carbon dioxide is changed from the liquid state to the gas state outdoors, the medium-pressure low-temperature refrigerant is pressurized by a supercharger to become a high-pressure high-temperature gas state or supercritical state refrigerant, the environmental heat is absorbed through the phase change from the liquid state to the gas state, the heat is released through the phase change from the gas state to the liquid state and is absorbed by the secondary refrigerant, the secondary refrigerant absorbs heat and then is heated, and a heat source in the nature is well utilized to meet the requirements of the temperature and the temperature rise of the secondary refrigerant.
Disclosure of Invention
The invention aims to provide a carbon dioxide refrigerant pressurizing circulation heating system and method and an air conditioner heater, which convert natural environment heat absorbed by a carbon dioxide refrigerant into a secondary refrigerant by fully utilizing an air energy phase change heating technology to meet the temperature rise requirement of the secondary refrigerant.
In order to achieve the purpose, the invention adopts the following technical scheme:
the first aspect of the present invention provides a carbon dioxide refrigerant pressurizing circulation heating system, including:
the refrigerant circulating tank is used for providing a liquid high-pressure normal-temperature carbon dioxide refrigerant for the system;
an inlet of the outdoor evaporator is connected with an outlet of the refrigerant circulating tank through an expansion valve and a reversing valve, and is used for receiving a liquid high-pressure normal-temperature carbon dioxide refrigerant discharged by the refrigerant circulating tank or the indoor condenser, absorbing outdoor environment heat and then completely vaporizing and converting the heat into gaseous medium-pressure low-temperature carbon dioxide;
the inlet of the gaseous carbon dioxide refrigerant supercharger is connected with the outlet of the outdoor evaporator and is used for receiving the medium-pressure low-temperature gaseous carbon dioxide refrigerant discharged by the outdoor evaporator and supercharging the gaseous carbon dioxide refrigerant into a gaseous high-temperature high-pressure carbon dioxide refrigerant; and
and the inlet of the indoor condenser is connected with the outlet of the gaseous carbon dioxide refrigerant supercharger and is used for receiving the gaseous or supercritical high-temperature and high-pressure carbon dioxide refrigerant discharged by the gaseous carbon dioxide refrigerant supercharger, releasing sensible heat and latent heat to the secondary refrigerant flowing through the surface of the indoor condenser to complete liquefaction of the gaseous or supercritical high-temperature and high-pressure carbon dioxide refrigerant and realize temperature rise and heating of the secondary refrigerant.
Further, the gaseous carbon dioxide refrigerant supercharger adopts a single-stage supercharger, a two-stage series supercharger or a multi-stage supercharger series connection mode for supercharging
Further, the inlet of the gaseous carbon dioxide refrigerant supercharger absorbs the gaseous medium-pressure low-temperature carbon dioxide discharged from the outdoor evaporator, and the outlet discharges high-pressure high-temperature carbon dioxide gas or supercritical fluid.
More preferably, the inlet pressure of the gaseous carbon dioxide refrigerant supercharger is 5kg/cm2-30kg/cm2The outlet discharge pressure was 53kg/cm2-180kg/cm2The outlet temperature is greater than 31 ℃.
Further, an outlet of the indoor condenser is connected with an inlet of the refrigerant circulation tank, and is used for receiving and circulating the high-temperature high-pressure liquid carbon dioxide discharged by the indoor condenser.
Further, the pressure of the gaseous medium-pressure low-temperature carbon dioxide at the outlet of the outdoor evaporator is 5kg/cm2-30kg/cm2。
Further, an outlet of the indoor condenser is connected with an inlet of the refrigerant circulation tank and is used for receiving and circulating the liquid normal-temperature high-pressure carbon dioxide refrigerant discharged by the indoor condenser.
Further, the secondary refrigerant is gaseous secondary refrigerant or liquid secondary refrigerant, the gaseous secondary refrigerant is air, nitrogen or argon, and the liquid secondary refrigerant is water, saline water, ethylene glycol or propylene glycol solution.
Furthermore, the outdoor evaporators are at least two groups and are arranged in parallel, and are used for alternately receiving the gaseous carbon dioxide which absorbs outdoor environment heat and evaporates into medium-pressure low-temperature after the liquid normal-temperature high-pressure carbon dioxide refrigerant is depressurized, and alternately utilizing the normal-temperature liquid state to defrost and deice the outer surface of the indoor heat exchanger.
Further preferably, the liquid carbon dioxide absorbs outdoor environment heat in one or more groups of the inner cavities of the outdoor evaporator and evaporates into gaseous carbon dioxide with medium pressure and low temperature; and the fans of the other group of outdoor evaporators stop running, and the outer surfaces of the evaporators are defrosted and deiced by utilizing the liquid temperature of the normal-temperature liquid carbon dioxide in the inner cavities of the evaporators.
Further preferably, an outlet of the outdoor evaporator is connected to an inlet of the gaseous carbon dioxide refrigerant supercharger through a reversing valve, and is used for alternately transferring gaseous medium-pressure low-temperature carbon dioxide discharged from the outdoor evaporator to the gaseous carbon dioxide refrigerant supercharger.
Further, still include:
the inlet of the air storage tank is connected with the outlet of the gaseous carbon dioxide refrigerant supercharger and is used for supercharging the secondary refrigerant in the gaseous carbon dioxide refrigerant supercharger to preset pressure by the gaseous carbon dioxide refrigerant supercharger before and after the system is started; and for supplying high pressure air to all lines and devices of the system for maintaining system pressure to prevent loss of line pressure and the production of dry ice.
Further preferably, the air storage tank provides high-pressure air to the refrigerant circulation tank, the indoor condenser, the outdoor evaporator and all the pipelines of the system through pipelines, and the high-pressure air is used for maintaining the pressure of the system to prevent the pressure loss of the pipelines and the generation of dry ice.
Further preferably, the gas in the air storage tank is high-pressure air for back pressure, and the pressure is 5.3kg/cm2To 90kg/cm2。
Further, still include:
the refrigerant balance tank is connected with the refrigerant circulating tank through a control valve and used for supplementing carbon dioxide refrigerants to the refrigerant circulating tank and receiving and storing the carbon dioxide refrigerants discharged from the refrigerant circulating tank by the system under fixed pressure due to temperature change.
The second aspect of the present invention provides a carbon dioxide refrigerant pressurization cycle heating method, which adopts the above carbon dioxide refrigerant pressurization cycle heating system, and includes the following steps:
s1, starting the gaseous carbon dioxide refrigerant booster to boost the pressure of the air storage tank by high-pressure air, when the pressure is increased to 90kg/cm2Then, closing the gaseous carbon dioxide refrigerant supercharger to stop air compression;
s2, connecting the refrigerant tank for debugging to a refrigerant balance tank through a one-way pressure reducing valve, conveying the carbon dioxide refrigerant in the refrigerant tank for debugging to the refrigerant circulation tank through the refrigerant balance tank by utilizing pressure difference, and keeping the pressure in the refrigerant circulation tank not lower than 70kg/cm2And a one-way exhaust valve is arranged at the upper part of the refrigerant circulating tank and the pressure is set to be 72kg/cm2；
S3, starting a debugging program, providing a carbon dioxide refrigerant for the system by the refrigerant circulating tank, operating for a certain time, stopping the system when all pressure measurement points of the system reach set pressure simultaneously, and then removing the refrigerant tank for debugging and the one-way emptying valve temporarily installed on the upper part of the refrigerant circulating tank;
s4, opening the control valve of the high-pressure air storage tank, providing back pressure high-pressure air for the system, controlling the inlet of the gaseous carbon dioxide refrigerant supercharger to be gaseous carbon dioxide refrigerant with the pressure of 8kg/cm2(ii) a The outlet is gaseous or supercritical carbon dioxide refrigerant with pressure of 50kg/cm2-180kg/cm2And the temperature at the outlet is not less than 31 ℃;
s5, starting an operation program, pressurizing and converting the carbon dioxide refrigerant in the refrigerant circulation tank into a high-pressure high-temperature gaseous or supercritical carbon dioxide refrigerant through a gaseous carbon dioxide refrigerant supercharger, sending the high-pressure high-temperature gaseous or supercritical carbon dioxide refrigerant into an indoor condenser, and exchanging heat with the secondary refrigerant on the outer surface of the indoor condenser to realize temperature rise and heating of the secondary refrigerant;
s6, sending the liquefied normal-temperature high-pressure carbon dioxide liquid flow to an outdoor evaporator after sensible heat and latent heat are released by the indoor condenser, and converting the liquefied normal-temperature high-pressure carbon dioxide liquid flow into gaseous medium-pressure low-temperature carbon dioxide to be discharged after outdoor environment heat is absorbed in the outdoor evaporator;
s7, the gaseous carbon dioxide refrigerant supercharger receives gaseous medium-pressure low-temperature carbon dioxide discharged by the outdoor evaporator, boosts the gaseous medium-pressure low-temperature carbon dioxide, converts the pressurized gaseous medium-pressure low-pressure carbon dioxide into a gaseous high-temperature high-pressure carbon dioxide refrigerant, and transfers the gaseous high-temperature high-pressure carbon dioxide refrigerant to the indoor condenser;
and S8, repeating the steps S5-S7 to realize the circulating heating of the carbon dioxide refrigerant.
Further, in step S4, before the system is started, the pressure of the high-pressure air in the air storage tank, the pipeline and the device for keeping the system from the outlet of the outdoor evaporator to the inlet of the gaseous carbon dioxide refrigerant supercharger during the shutdown is maintained at 8kg/cm2When the pressure is lower than 7kg/cm2The time program will prevent the systemAnd (5) starting.
Further, before the system is started, the high-pressure air in the air storage tank is used for keeping the pressure of a pipeline and a device between the outlet of the supercharger and the inlet of the expansion valve and the reversing valve in the system at 50kg/cm during the shutdown2When the pressure is lower than 48kg/cm2The timer program will prevent the system from booting up.
The third aspect of the invention provides an air conditioner heater, which adopts the carbon dioxide refrigerant pressurizing circulation heating system.
By adopting the technical scheme, compared with the prior art, the invention has the following technical effects:
(1) the gaseous carbon dioxide with a certain pressure when the liquid is evaporated into gas is pressurized and heated by the gaseous carbon dioxide refrigerant booster, so that the pressurization efficiency is improved. The indoor condenser is used for cooling and liquefying gaseous high-temperature and high-pressure carbon dioxide refrigerants to release heat, so that the secondary refrigerants absorb heat and heat, the heating efficiency is high, the operating cost is low, and the purposes of energy conservation and environmental protection are achieved;
(2) the normal-temperature high-pressure liquid carbon dioxide refrigerant is depressurized and absorbs heat to gasify into gaseous medium-pressure low-temperature carbon dioxide through the outdoor evaporator, and then the gaseous medium-pressure low-temperature carbon dioxide is pressurized and heated again through the gaseous carbon dioxide refrigerant supercharger for recycling, so that the volumetric refrigerating capacity of the carbon dioxide refrigerant is improved, and the operation cost of the air conditioner is effectively reduced;
(3) two or more outdoor evaporators arranged in parallel are used alternately in a circulating mode, gaseous medium-pressure low-temperature carbon dioxide refrigerants are received alternately through reversing valves, so that the system can continuously heat and defrost alternately, and the stable operation of the air-conditioning system is guaranteed;
(4) the high-pressure air is led out from the high-pressure air storage tank to each pipeline and equipment of the system and used for supplementing the pressure change of the circulating system caused by the density change of the refrigerant caused by the temperature change, and simultaneously, the pipeline pressure loss and the possible generation of dry ice caused by the temperature change during the shutdown are prevented.
Drawings
Fig. 1 is a schematic diagram of a frame of a carbon dioxide refrigerant supercharging circulation heating system of the present invention;
FIG. 2 is a process flow diagram of a carbon dioxide refrigerant pressurization cycle heating method according to the present invention;
wherein the reference symbols are:
1-refrigerant circulation tank, 2-expansion valve and reversing valve, 3-outdoor evaporator, 4-reversing valve, 5-gaseous carbon dioxide refrigerant supercharger, 6-indoor condenser, 7-regulating valve, 8-high-pressure air storage tank, 9-pipeline and 10-refrigerant balance tank.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
As shown in fig. 1, a carbon dioxide refrigerant pressurized cycle heating system is provided, which mainly includes a refrigerant cycle tank 1, an outdoor evaporator 3, a gaseous carbon dioxide refrigerant supercharger 5 and an indoor condenser 6, where the refrigerant cycle tank 1 is used to provide a carbon dioxide refrigerant for the system, and the carbon dioxide refrigerant may be a gaseous high-pressure normal-temperature carbon dioxide refrigerant, a supercritical high-pressure normal-temperature carbon dioxide refrigerant or a liquid high-pressure normal-temperature carbon dioxide refrigerant. In the heating system, the outdoor evaporator 3 serves as an outdoor unit of the heating system, and the indoor condenser 6 serves as an indoor unit of the heating system.
In the heating system, as shown in fig. 1, an inlet of the outdoor evaporator 3 is connected to an outlet of the refrigerant circulation tank 1 through an expansion valve and a direction changing valve 2, and is configured to receive a liquid high-pressure normal-temperature carbon dioxide refrigerant discharged from the refrigerant circulation tank 1 or the indoor condenser 6, and completely vaporize the refrigerant to convert the refrigerant into gaseous medium-pressure low-temperature carbon dioxide after absorbing heat of an outdoor environment, and the expansion valve and the direction changing valve 2 include an expansion regulating valve and a direction changing valve which are arranged in series. In addition, when the system starts to operate, carbon dioxide refrigerant is provided for the system through the refrigerant circulation tank 1, and when the refrigerant in the refrigerant circulation tank 1 is gaseous, the refrigerant is directly transferred to the inlet of the gaseous carbon dioxide refrigerant supercharger 5 through the pressure reducing valve 7 by utilizing pressure difference; when the refrigerant in the refrigerant circulation tank 1 is in a supercritical state or a liquid state, the refrigerant is transferred to the outdoor evaporator 3 through the expansion valve and the reversing valve 2 to absorb the heat of the outdoor environment, is completely vaporized and converted into gaseous medium-pressure low-temperature carbon dioxide, and is transferred to the inlet of the gaseous carbon dioxide refrigerant supercharger 5.
In this heating system, as shown in fig. 1, an inlet of the gaseous carbon dioxide refrigerant supercharger 5 is connected to an outlet of the exterior evaporator 3, and receives the medium-pressure low-temperature gaseous carbon dioxide refrigerant discharged from the exterior evaporator 3, and supercharges and converts the medium-pressure low-temperature gaseous carbon dioxide refrigerant into a gaseous high-temperature high-pressure carbon dioxide refrigerant. Meanwhile, as described above, the gaseous carbon dioxide refrigerant supercharger 5 is also directly connected to the refrigerant circulation tank 1 through the pressure reducing valve 7 via a pipe, and directly supplies the carbon dioxide refrigerant to the system through the refrigerant circulation tank 1. It should be noted that the gaseous carbon dioxide refrigerant booster 5 is also used to supply high pressure gas to the air storage tank 8 before the system is started and to supplement the air in the air storage tank 8 to a set pressure when the system is stopped.
In the heating system, as shown in fig. 1, an inlet of the indoor condenser 6 is connected to an outlet of the gaseous carbon dioxide refrigerant supercharger 5, and is configured to receive the gaseous high-temperature high-pressure carbon dioxide refrigerant discharged from the gaseous carbon dioxide refrigerant supercharger 5, and release sensible heat and latent heat to the coolant flowing through the surface of the coolant to complete liquefaction of the gaseous high-temperature high-pressure carbon dioxide refrigerant, and to achieve heat absorption and temperature rise of the coolant. That is, the high-pressure and high-temperature gaseous carbon dioxide or supercritical carbon dioxide discharged from the gaseous carbon dioxide refrigerant supercharger 5 is converted into a liquid carbon dioxide refrigerant after sensible heat and latent heat are released from the indoor condenser 6.
In the heating system, the gaseous carbon dioxide refrigerant supercharger 5 is used as a power unit of the heating system to ensure that the carbon dioxide has a higher liquefaction temperature point according to different environmental temperaturesThe single-stage supercharger or the double-stage supercharger or a plurality of groups of single-stage superchargers are used for supercharging in a series connection mode. In order to realize the recycling of the carbon dioxide refrigerant, the inlet pressure of the gaseous carbon dioxide refrigerant supercharger 5 is required to be 5kg/cm2-30kg/cm2(ii) a The pressure discharged from the outlet of the gaseous carbon dioxide refrigerant supercharger 5 after being supercharged is 53kg/cm2-180kg/cm2The outlet temperature is greater than 31 ℃.
Specifically, the gaseous carbon dioxide refrigerant supercharger used in this embodiment is an oil-free lubrication supercharger, and the standard thereof is as follows: model YXWCD-13/13-70; carbon dioxide as a medium; the air inlet pressure is 1.3 mpa; the exhaust pressure is 7.0 mpa; displacement of 13Nm3H; the motor power is 1.1 kw; cylinder phi 36+ phi 20; secondary compression; the rotating speed is 470 r/min; inlet and outlet size Rc 1/2; physical dimension 1050 x 700 x 1400; no oil lubrication and wind cooling.
It should be noted that the inlet of the gaseous carbon dioxide refrigerant supercharger 5 absorbs the gaseous medium-pressure low-temperature carbon dioxide discharged from the outdoor evaporator 3, the outlet discharges high-pressure high-temperature carbon dioxide gas or supercritical fluid, and the pressure of the gaseous medium-pressure low-temperature carbon dioxide at the outlet of the outdoor evaporator 3 is 5kg/cm2-30kg/cm2And the gaseous carbon dioxide medium-pressure low-temperature carbon dioxide is subjected to gaseous carbon dioxide heating in a pressurization mode through the gaseous carbon dioxide refrigerant supercharger 5, and the temperature of the pressurized carbon dioxide is higher than 31 ℃.
In the heating system, in order to realize the continuous operation of the heating system, the normal-temperature high-pressure carbon dioxide liquid discharged by the indoor condenser 6 is required to be recycled, and the outlet of the indoor condenser 6 is connected with the inlet of the refrigerant circulating tank 1 and is used for receiving and storing the normal-temperature high-pressure carbon dioxide liquid discharged by the indoor condenser 6. Specifically, sensible heat and latent heat are released to the secondary refrigerant through the gaseous high-temperature high-pressure carbon dioxide refrigerant flowing through the secondary refrigerant, the liquefaction of the gaseous high-temperature high-pressure carbon dioxide refrigerant is completed while the temperature of the secondary refrigerant is raised, and the heat is released to the secondary refrigerant through the reciprocating cycle, so that the heating of the secondary refrigerant is completed. The liquefied liquid carbon dioxide refrigerant at normal temperature and high pressure is continuously sent to the outdoor evaporator 3 for recycling.
In the heating system, the coolant is gaseous coolant or liquid coolant, the gaseous coolant is air, nitrogen or argon, and the liquid coolant is water, brine, ethylene glycol or propylene glycol solution. Preferably, the refrigerating medium can directly adopt outdoor air, and the outdoor air is directly introduced into a room after being dedusted and sterilized to absorb heat and raise temperature. In addition, according to the requirement, the secondary refrigerant can also adopt a double-secondary-refrigerant combination mode, for example, the combination of gaseous secondary refrigerant and liquid secondary refrigerant, firstly, the liquid secondary refrigerant water, saline water, ethylene glycol or propylene glycol solution is used as the first secondary refrigerant of the heating system to exchange heat with carbon dioxide refrigerant to realize heating, then, air is used as the second secondary refrigerant to exchange heat with the first secondary refrigerant to realize secondary heating, and the heated second secondary refrigerant is directly introduced into the room for use.
Example 2
Different from the above embodiment 1, as shown in fig. 1, a carbon dioxide refrigerant pressurizing and circulating heating system which adopts two chambers of external evaporators and can alternately operate circularly is provided, the heating system mainly comprises a refrigerant circulating tank 1, a gaseous carbon dioxide refrigerant pressurizing machine 5, an indoor condenser 6 and two outdoor evaporators 3, the refrigerant circulating tank 1 is used for providing gaseous carbon dioxide refrigerant for the system; and the inlet of the gaseous carbon dioxide refrigerant supercharger 5 is connected with the outlet of the refrigerant circulating tank 1 through a pressure reducing valve 2 and is used for receiving the gaseous carbon dioxide refrigerant and converting the gaseous carbon dioxide refrigerant into high-temperature and high-pressure carbon dioxide gas through pressurization. The two outdoor evaporators 3 which are arranged in parallel are used in a circulating and alternate mode, gaseous medium-pressure low-temperature carbon dioxide refrigerants are received alternately through the reversing valve 5, the system can be guaranteed to heat continuously, defrosting and deicing alternately can be achieved, and stable operation of the air conditioning system is guaranteed.
In each heating system, the outdoor evaporator 3 is two sets of and is parallel arrangement, further preferably, the entry of the outdoor evaporator 3 is connected through the reversing valve 4 the indoor condenser 6 with gaseous carbon dioxide refrigerant booster 5, two parallel arrangements the both ends of the outdoor evaporator 3 are connected through the reversing valve 5 the indoor condenser 6 and the gaseous carbon dioxide refrigerant booster 5 for alternately receiving the high-pressure normal-temperature liquid carbon dioxide. And the alternately received high-pressure normal-temperature liquid carbon dioxide exchanges heat with the outdoor environment in the corresponding outdoor evaporator 3 and is discharged through the reversing valve 5 and sent into the gaseous carbon dioxide refrigerant supercharger 5 for cyclic utilization.
Specifically, the heating system adopts two outdoor evaporators 3 which are arranged in parallel, and when the heating system works, liquid carbon dioxide which is discharged from an indoor condenser 6 and is subjected to pressure regulation through an expansion throttle valve 2 absorbs outdoor environment heat in the inner cavity of one or more groups of outdoor evaporators 3 and is evaporated into gaseous carbon dioxide with medium pressure and low temperature; and the fans of the other group of outdoor evaporators 3 stop running, and the liquid temperature of the liquid carbon dioxide in the inner cavities of the evaporators is utilized to defrost and deice the outer surfaces of the evaporators. That is to say, when the liquid high-pressure normal-temperature carbon dioxide refrigerant flowing through one group of outdoor evaporators 3 exchanges heat with the outdoor environment and is converted into gaseous medium-pressure low-temperature carbon dioxide, the liquid refrigerant with high pressure and temperature higher than the freezing point flows through the inner cavity of the other group of outdoor evaporators 3, and the liquid temperature of the refrigerant is utilized to defrost and deice the outer surface of the evaporators, so that the outdoor evaporators are prevented from frosting and freezing after being used for a long time.
In this heating system, as shown in fig. 1, the outlet of the outdoor evaporator 3 is connected to the inlet of the gaseous carbon dioxide refrigerant supercharger 5 via a selector valve 5, and the outlet is used to alternately transfer gaseous medium-pressure low-temperature carbon dioxide discharged from the outdoor evaporator 3 to the gaseous carbon dioxide refrigerant supercharger 5 for supercharging.
Example 3
Different from the above embodiment 1 and embodiment 2, in order to maintain the pressure in the heating system to prevent the pressure loss of the pipeline and the generation of dry ice, the system failure is avoided, and the service life of the heating system is prolonged. The carbon dioxide refrigerant pressurizing circulating heating system also comprises an air storage tank 8 which is used for supplementing the pressure change of a circulating system caused by the density change of the refrigerant caused by the temperature change, and simultaneously preventing the pressure loss of a pipeline and the possible generation of dry ice caused by the temperature change during the shutdown.
In the heating system, the inlet of the air storage tank 8 is connected with the outlet of the gaseous carbon dioxide refrigerant supercharger 5, and is used for pressurizing the gaseous carbon dioxide refrigerant supercharger 5 with air to a preset pressure before starting and stopping the system, so that high-pressure air is provided for all pipelines and devices of the system, and the system pressure is maintained to prevent the pipelines from being decompressed and generate dry ice. Specifically, the air storage tank 8 provides high-pressure air to the refrigerant circulation tank 1, the indoor condenser 6, the outdoor evaporator 3 and all the pipelines of the system through a pipeline 10, and is used for maintaining the pressure of the system to prevent the pressure loss of the pipelines and the generation of dry ice.
In this heating system, the gas in the air tank 8 is high-pressure air for back pressure, and the pressure thereof is 6kg/cm2To 90kg/cm2. High-pressure air is used as the system back pressure for maintaining the pressure balance of each device and pipeline in the system on one hand and defrosting and deicing on the other hand.
In addition, as shown in fig. 1, the heating system further includes a refrigerant balance tank 10, an inlet of the refrigerant balance tank 10 is connected with a refrigerant tank for debugging through a one-way regulating valve, and the refrigerant tank for debugging is an external device of the system and is used for providing a gaseous or liquid carbon dioxide refrigerant to the refrigerant balance tank 10 before the system is started. The outlet of the refrigerant balance tank 10 is connected with the refrigerant circulation tank 3 through a one-way regulating valve, and is used for supplementing carbon dioxide refrigerant to the system and receiving and storing the carbon dioxide refrigerant discharged from the refrigerant circulation tank 1 by the pressure increase caused by the temperature change of the system when the system is shut down.
And it is worth noting that the refrigerant tank for debugging is externally connected with refrigerant supply equipment of the system, and is dismantled after the system is started, the circulation heating of the air conditioner is realized only by using carbon dioxide refrigerants in the refrigerant balance tank 10 and the refrigerant circulation tank 1, and when the carbon dioxide refrigerants in the system are not enough due to loss, the carbon dioxide refrigerants are supplemented by being connected into the refrigerant tank for debugging.
Example 4
As shown in fig. 2, based on the carbon dioxide refrigerant pressurization cycle heating system in the foregoing embodiment 1, embodiment 2, and embodiment 3, a carbon dioxide refrigerant pressurization cycle heating method is provided, which includes the following steps:
s1, starting gaseous dioxygenThe carbon dioxide refrigerant supercharger 5 supercharges the air storage tank 8 by adopting high-pressure air, and when the supercharge pressure is up to 90kg/cm2Then, the gaseous carbon dioxide refrigerant supercharger 5 is closed to stop air compression;
s2, connecting the refrigerant tank for debugging to the refrigerant balance tank 10 through a one-way pressure reducing valve, conveying the carbon dioxide refrigerant in the refrigerant tank for debugging to the refrigerant circulation tank 1 through the refrigerant balance tank 10 by utilizing pressure difference, and keeping the pressure in the refrigerant circulation tank 1 not lower than 70kg/cm2And a one-way emptying valve is arranged at the upper part of the refrigerant circulating tank 1 and the pressure is set to be 72kg/cm2；
S3, starting a debugging program, providing a carbon dioxide refrigerant for the system by the refrigerant circulating tank 1, operating for a certain time, stopping the system when all pressure measurement points of the system reach set pressure simultaneously, and then removing the refrigerant tank for debugging and the one-way emptying valve temporarily installed on the upper part of the refrigerant circulating tank 1;
s4, opening the control valve of the high-pressure air storage tank, providing back pressure high-pressure air for the system, controlling the inlet of the gaseous carbon dioxide refrigerant supercharger 5 to be gaseous carbon dioxide refrigerant with the pressure of 8kg/cm2(ii) a The outlet is gaseous or supercritical carbon dioxide refrigerant with pressure of 50kg/cm2-180kg/cm2And the temperature at the outlet is not less than 31 ℃;
s5, starting an operation program, pressurizing gaseous medium-pressure low-temperature carbon dioxide regulated by the reversing valve 2 into high-pressure high-temperature gaseous or supercritical carbon dioxide refrigerant by the gaseous carbon dioxide refrigerant supercharger 5, and delivering the high-pressure high-temperature gaseous or supercritical carbon dioxide refrigerant into the indoor condenser 6 to exchange heat with secondary refrigerant on the outer surface of the indoor condenser 6, so that the secondary refrigerant is heated;
s6, sending the liquefied normal-temperature high-pressure carbon dioxide liquid stream to the outdoor evaporator 3 after sensible heat and latent heat are released by the indoor condenser 6, and converting the liquefied normal-temperature high-pressure carbon dioxide liquid stream into gaseous medium-pressure low-temperature carbon dioxide to be discharged after absorbing outdoor environment heat in the outdoor evaporator 3;
s7, the gaseous carbon dioxide refrigerant supercharger 5 receives the gaseous medium-pressure low-temperature carbon dioxide discharged from the outdoor evaporator 3, boosts the gaseous medium-pressure low-temperature carbon dioxide, converts the boosted gaseous medium-pressure carbon dioxide into a gaseous high-temperature high-pressure carbon dioxide refrigerant, and transfers the gaseous high-temperature high-pressure carbon dioxide refrigerant to the indoor condenser 6;
and S8, repeating the steps S5-S7 to realize the circulating heating of the carbon dioxide refrigerant.
In step S4 for the heating system, before the system is started, the pressure of the high-pressure air in the air storage tank 8, the pipeline and the device for keeping the system from the outlet of the outdoor evaporator 3 to the inlet of the gaseous carbon dioxide refrigerant supercharger 5 during the shutdown is maintained at 8kg/cm2When the pressure is lower than 7kg/cm2The timer program will prevent the system from booting up.
In step S4 for the heating system, the pressure of the high-pressure air in the air storage tank 8 is maintained at 50kg/cm by maintaining the pressure of the piping and the devices from the outlet of the gaseous carbon dioxide refrigerant supercharger 5 to the inlet of the expansion valve and the selector valve 2 at the time of the stop of the system before the start of the system2When the pressure is lower than 48kg/cm2The timer program will prevent the system from booting up.
According to the operation flow of the carbon dioxide refrigerant pressurizing and circulating heating system, the carbon dioxide refrigerant pressurizing and circulating heating method provided by the embodiment can be divided into three stages of starting and installing a heating program, operating and installing the heating program and starting the heating program to operate.
The method comprises the steps of starting and installing a heating program to be a system preparation stage, executing steps S1 and S2, starting a supercharger to pressurize high-pressure air for an air storage tank to preset pressure to obtain air compression stop, providing refrigerant and high-pressure air for backpressure for the operation of the heating system, and simultaneously providing carbon dioxide refrigerant for a refrigerant balance tank 10 by adopting an external refrigerant tank for debugging.
And (4) operating and installing a heating program as a starting-up stage of the system, executing steps S3 and S4, detecting whether the system pressure reaches a set pressure, and removing the refrigerant balance tank to prepare for formal starting of the system. At the same time, a control valve on the high-pressure air storage tank 8 is opened, and the back pressure high-pressure air in the control valve keeps the pressure from the outlet of the outdoor evaporator 3 to the inlet of the gaseous carbon dioxide refrigerant supercharger 5 at 8kg/cm2While maintaining the pressure of the piping from the outlet of the gaseous carbon dioxide refrigerant supercharger 5 to the inlet of the exterior evaporator 3 including the interior condenser 6 at 57kg/cm2。
In addition, the heating program is started as the heating operation stage of the system, in the stage, all pipelines of the system independently provide compressed air as back pressure, and each storage tank simultaneously has high-pressure air as back pressure. Circularly executing steps S4, S5, S7 and S8, pressurizing and converting a carbon dioxide refrigerant in a refrigerant circulating tank 1 into a high-pressure high-temperature gaseous or supercritical carbon dioxide refrigerant by a gaseous carbon dioxide refrigerant supercharger 5, sending the high-pressure high-temperature gaseous or supercritical carbon dioxide refrigerant into an indoor condenser 6, and exchanging heat with a secondary refrigerant on the outer surface of the indoor condenser 6 to realize temperature rise and heating of the secondary refrigerant; the liquefied normal-temperature high-pressure carbon dioxide liquid flow after sensible heat and latent heat are released by the indoor condenser 6 is sent to the outdoor evaporator 3, and is converted into gaseous medium-pressure low-temperature carbon dioxide after absorbing outdoor environment heat to be discharged; the gaseous carbon dioxide refrigerant supercharger 5 is used for supercharging gaseous medium-pressure low-temperature carbon dioxide into a gaseous high-temperature high-pressure carbon dioxide refrigerant, and transferring the gaseous high-temperature high-pressure carbon dioxide refrigerant to the indoor condenser 6; and repeating the steps to realize the circulating heating of the carbon dioxide refrigerant.
The points to be finally explained are: first, in the description of the present application, it should be noted that, unless otherwise specified and limited, the terms "mounted," "connected," and "connected" should be understood broadly, and may be a mechanical connection or an electrical connection, or a communication between two elements, and may be a direct connection, and "upper," "lower," "left," and "right" are only used to indicate a relative positional relationship, and when the absolute position of the object to be described is changed, the relative positional relationship may be changed;
secondly, the method comprises the following steps: in the drawings of the disclosed embodiments of the invention, only the structures related to the invention are referred to, other structures can refer to common designs, and the same embodiment and different embodiments of the invention can be combined with each other without conflict;
and finally: the above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that are within the spirit and principle of the present invention are intended to be included in the scope of the present invention.

Claims (11)

1. Carbon dioxide refrigerant pressure boost circulation heating system, its characterized in that includes:
the system comprises a refrigerant circulating tank (1), wherein the refrigerant circulating tank (1) is used for providing a liquid high-pressure normal-temperature carbon dioxide refrigerant for the system;
an inlet of the outdoor evaporator (3) is connected with an outlet of the refrigerant circulating tank (1) through an expansion valve and a reversing valve (2) and is used for receiving a liquid high-pressure normal-temperature carbon dioxide refrigerant discharged by the refrigerant circulating tank (1) and/or the indoor condenser (6), and then the liquid high-pressure normal-temperature carbon dioxide refrigerant is completely vaporized and converted into a gaseous medium-pressure low-temperature carbon dioxide refrigerant after absorbing outdoor environment heat;
the device comprises a gaseous carbon dioxide refrigerant supercharger (5), wherein the inlet of the gaseous carbon dioxide refrigerant supercharger (5) is connected with the outlet of the outdoor evaporator (3) and is used for receiving a gaseous medium-pressure low-temperature carbon dioxide refrigerant discharged from the outdoor evaporator (3) and supercharging the gaseous medium-pressure low-temperature carbon dioxide refrigerant into a gaseous or supercritical high-temperature high-pressure carbon dioxide refrigerant; and
the indoor condenser (6), the entry linkage of indoor condenser (6) the export of gaseous carbon dioxide refrigerant booster compressor (5) is used for receiving gaseous or the high temperature high pressure carbon dioxide refrigerant of supercritical state of gaseous carbon dioxide refrigerant booster compressor (5) exhaust to the secondary refrigerant that flows through its surface releases sensible heat and latent heat and accomplishes the liquefaction of high temperature high pressure carbon dioxide refrigerant, realizes the intensification of secondary refrigerant simultaneously and heats.
2. The carbon dioxide refrigerant pressurization cycle heating system according to claim 1, wherein the gaseous carbon dioxide refrigerant supercharger (5) is pressurized by a single-stage supercharger, a two-stage series supercharger or a multi-stage supercharger in series; the inlet pressure of the gaseous carbon dioxide refrigerant supercharger (5) is 5kg/cm2-30kg/cm2The outlet discharge pressure was 53kg/cm2-180kg/cm2The outlet temperature is greater than 31 ℃.
3. The carbon dioxide refrigerant supercharging-cycle heating system according to claim 1, wherein an inlet of the gaseous carbon dioxide refrigerant supercharger (5) absorbs the outdoor evaporator (3)The discharged gaseous medium-pressure low-temperature carbon dioxide is discharged, high-pressure high-temperature carbon dioxide gas or supercritical fluid is discharged from an outlet, and the pressure of the gaseous medium-pressure low-temperature carbon dioxide at the outlet of the outdoor evaporator (3) is 5kg/cm2-30kg/cm2。
4. The carbon dioxide refrigerant pressurizing and circulating heating system as claimed in claim 1, wherein an outlet of the indoor condenser (6) is connected with an inlet of the refrigerant circulating tank (1) and is used for receiving and circulating a liquid high-pressure carbon dioxide refrigerant discharged by the indoor condenser (6).
5. The carbon dioxide refrigerant charge cycle heating system of claim 1, wherein the coolant is a gaseous coolant or a liquid coolant, the gaseous coolant is air, nitrogen or argon, and the liquid coolant is water, brine, ethylene glycol or propylene glycol solution.
6. The carbon dioxide refrigerant pressurized cycle heating system according to claim 1, wherein the at least two groups of outdoor evaporators (3) are arranged in parallel, and are configured to alternately receive a liquid high-pressure carbon dioxide refrigerant and absorb outdoor environment heat to evaporate gaseous carbon dioxide into medium-pressure low-temperature carbon dioxide, and simultaneously alternately perform defrosting and deicing on the outer surface of the outdoor evaporator (3).
7. The carbon dioxide refrigerant pressurized cycle heating system according to claim 1, further comprising:
the inlet of the air storage tank (8) is connected with the outlet of the gaseous carbon dioxide refrigerant supercharger (5) and is used for pressurizing the inside of the system to a preset pressure by air through the gaseous carbon dioxide refrigerant supercharger (5) before the system is started and stopped; and is used for providing high-pressure air for all pipelines and devices of the system, and is used for maintaining the pressure of the system so as to prevent the pipelines from losing pressure and generating dry ice;
wherein the gas in the air storage tank (8) is high pressure for back pressureAir at a pressure of 5.3kg/cm2To 90kg/cm2。
8. The carbon dioxide refrigerant pressurized cycle heating system according to claim 1, further comprising:
the refrigerant balance tank (10) is connected with the refrigerant circulating tank (1) through a control valve, and is used for supplementing carbon dioxide refrigerants to the refrigerant circulating tank (1) and receiving and storing the carbon dioxide refrigerants discharged from the refrigerant circulating tank (1) by a system under fixed pressure due to temperature change.
9. The carbon dioxide refrigerant pressurizing circulation heating method is characterized in that the carbon dioxide refrigerant pressurizing circulation heating system according to any one of claims 1 to 8 is adopted, and the method comprises the following steps:
s1, starting the gaseous carbon dioxide refrigerant booster (5) to boost the pressure of the air storage tank (8) by high-pressure air, when the pressure is increased to 90kg/cm2Then, closing the gaseous carbon dioxide refrigerant supercharger (5) to stop air compression;
s2, connecting the refrigerant tank for debugging to a refrigerant balance tank (10) through a one-way pressure reducing valve, conveying the carbon dioxide refrigerant to a refrigerant circulation tank (1) through the refrigerant balance tank (10) by utilizing pressure difference, and keeping the pressure in the refrigerant circulation tank (1) not lower than 70kg/cm2And a one-way emptying valve is arranged at the upper part of the refrigerant circulating tank (1) and the pressure is set to be 72kg/cm2；
S3, starting a debugging program, providing carbon dioxide refrigerants for the system by the refrigerant circulating tank (1), operating for a certain time, stopping the system when all pressure measurement points of the system reach set pressure simultaneously, and then removing the refrigerant tank for debugging and the one-way emptying valve temporarily installed on the upper part of the refrigerant circulating tank (1);
s4, opening the control valve of the high-pressure air storage tank, providing back pressure high-pressure air for the system, controlling the inlet of the gaseous carbon dioxide refrigerant supercharger (5) to be gaseous carbon dioxide refrigerant with the pressure of 8kg/cm2(ii) a The outlet is gaseous or supercritical carbon dioxide refrigerant with pressure of 50kg/cm2-180kg/cm2And the temperature at the outlet is not less than 31 ℃;
s5, starting an operation program, pressurizing and converting the carbon dioxide refrigerant in the refrigerant circulating tank (1) into a high-pressure high-temperature gaseous or supercritical carbon dioxide refrigerant through the gaseous carbon dioxide refrigerant supercharger (5), and sending the high-pressure high-temperature gaseous or supercritical carbon dioxide refrigerant into the indoor condenser (6) to exchange heat with the secondary refrigerant on the outer surface of the indoor condenser (6) so as to realize temperature rise and heating of the secondary refrigerant;
s6, sending the liquefied normal-temperature high-pressure carbon dioxide liquid flow to the outdoor evaporator (3) after sensible heat and latent heat are released by the indoor condenser (6), and converting the liquefied normal-temperature high-pressure carbon dioxide liquid flow into gaseous medium-pressure low-temperature carbon dioxide to be discharged after absorbing outdoor environment heat in the outdoor evaporator (3);
s7, the gaseous carbon dioxide refrigerant supercharger (5) receives gaseous medium-pressure low-temperature carbon dioxide discharged by the outdoor evaporator (3), boosts the gaseous medium-pressure low-temperature carbon dioxide, and converts the pressurized gaseous medium-pressure low-pressure carbon dioxide into a gaseous high-temperature high-pressure carbon dioxide refrigerant;
and S8, sending the gaseous high-temperature and high-pressure carbon dioxide refrigerant flow pressurized by the gaseous carbon dioxide refrigerant supercharger (5) to the indoor condenser (6), and performing heat exchange with the secondary refrigerant flowing through the outer surface of the indoor condenser (6) to realize the circulating heating of the secondary refrigerant.
10. The carbon dioxide refrigerant pressurized cycle heating method as claimed in claim 9, wherein in step S4, before the system is started, the pressure of the high pressure air in the air storage tank (8), the pipeline and the device for maintaining the system from the outlet of the outdoor evaporator (3) to the inlet of the gaseous carbon dioxide refrigerant supercharger (5) during the shutdown is maintained at 8kg/cm2When the pressure is lower than 7kg/cm2The timer program will prevent the system from booting up.
And before the system is started, high-pressure air in an air storage tank (8) is used for keeping the pressure of a pipeline and a device between the outlet of the gaseous carbon dioxide refrigerant supercharger (5) and the inlet of the expansion valve and the reversing valve (2) of the system at 50kg/cm during the shutdown2When the pressure is lower than 48kg/cm2The timer program will prevent the system from booting up.
11. An air-conditioning heater, characterized in that the carbon dioxide refrigerant pressurizing circulation heating system according to any one of claims 1-8 is adopted.
CN202111038264.2A 2021-09-06 2021-09-06 Carbon dioxide refrigerant pressurizing circulation heating system and method and air conditioner heater Withdrawn CN113970192A (en)

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CN202111038264.2A CN113970192A (en) 2021-09-06 2021-09-06 Carbon dioxide refrigerant pressurizing circulation heating system and method and air conditioner heater
PCT/CN2022/117403 WO2023030544A1 (en) 2021-09-06 2022-09-06 Carbon dioxide refrigerant gas pressurized circulation system, circulation method, and cooling and heating air conditioner

Applications Claiming Priority (1)

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CN202111038264.2A CN113970192A (en) 2021-09-06 2021-09-06 Carbon dioxide refrigerant pressurizing circulation heating system and method and air conditioner heater

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