CN221172388U - Carbon dioxide heat pump heating system - Google Patents

Abstract

The utility model discloses a carbon dioxide heat pump heat supply system, which comprises a gas cooler, wherein one side of the gas cooler is a carbon dioxide side, the other side of the gas cooler is a water side, a compressor, the carbon dioxide side of the gas cooler, a throttle valve and an air heat exchanger are sequentially connected to form a carbon dioxide circulation loop, a heat supply pipeline, a heat supply unit, a first heat exchanger, a water return pipeline and the water side of the gas cooler are sequentially connected to form a water circulation loop, after the carbon dioxide side of the gas cooler is in heat exchange with the water side of the gas cooler, high-temperature circulating water flowing out of the water side of the gas cooler flows into the heat supply unit to supply heat through the heat supply pipeline, and low-temperature circulating water cooled after the medium-temperature circulating water flowing out of the heat supply unit flows into the first heat exchanger is returned to the water side of the gas cooler through the water return pipeline. According to the carbon dioxide heat pump heating system provided by the utility model, the low-temperature circulating water can improve the performance of the carbon dioxide circulating loop, and the energy-saving effect is realized.

Description

Carbon dioxide heat pump heating system

Technical Field

The utility model belongs to the technical field of heat supply equipment, and particularly relates to a carbon dioxide heat pump heat supply system.

Background

At present, a carbon dioxide air source heat pump is regarded as a new generation heat pump air conditioning technology, on one hand, carbon dioxide is taken as a natural working medium, and the heat pump air conditioning technology has the advantages of safety, no toxicity, incombustibility, good heat transfer performance, no ozone layer damage, extremely low greenhouse gas effect (GWP=1) and the like; on the other hand, the carbon dioxide working medium is suitable for a low-temperature operation environment, and the heat pump system has higher operation energy efficiency. However, the operation energy efficiency of the carbon dioxide heat pump is greatly affected by the outlet temperature of the air cooler, and the circulation performance gradually decreases with the rise of the outlet temperature of the air cooler. I.e. if a higher cycle performance COP is desired, the outlet temperature of the air cooler can be reduced, which is limited by the inlet temperature of the cooling medium, measures have to be taken to reduce the return water temperature of the air cooler.

When the existing carbon dioxide air source heat pump is applied to a heating system, the temperature of heat supply backwater is higher, and the heat is directly transferred into an air cooler of the carbon dioxide air source heat pump at the moment, so that the cycle performance COP of the carbon dioxide air source heat pump is extremely low.

Therefore, there is a need to design a heat supply system of a carbon dioxide heat pump to solve the above-mentioned problem that the heat supply backwater temperature is high, resulting in low circulation performance of the carbon dioxide air source heat pump.

Disclosure of utility model

Aiming at the technical problem that the circulation performance of a carbon dioxide air source heat pump is low due to the fact that the temperature of heat supply backwater is high in the background art, the carbon dioxide heat pump heat supply system is provided to solve the problem.

In order to achieve the above purpose, the specific technical scheme of the carbon dioxide heat pump heat supply system of the utility model is as follows:

The utility model provides a carbon dioxide heat pump heating system, including gas cooler, gas cooler one side is the carbon dioxide side, gas cooler opposite side is the water side, still include the compressor, choke valve and air heat exchanger, the carbon dioxide side of gas cooler, choke valve and air heat exchanger connect gradually and form the carbon dioxide circulation loop, still include the heating line, the heating unit, first heat exchanger and return water pipeline, the heating line, the heating unit, the water side of first heat exchanger, return water pipeline and gas cooler connects gradually and forms the water circulation loop, after gas cooler's carbon dioxide side and gas cooler's water side heat exchange, the high temperature circulating water that gas cooler's water side flows into the heating unit heat supply through the heating line, the medium temperature circulating water that the heating unit flows into heat transfer in the first heat exchanger, the low temperature circulating water that cools down after the heat transfer of first heat exchanger flows back to gas cooler's water side through the return water pipeline.

Further, the first heat exchanger is connected with an air heat exchange unit, the air heat exchange unit is provided with an air inlet and an air outlet, low-temperature air entering through the air inlet exchanges heat with medium-temperature circulating water in the first heat exchanger, hot air is discharged from the air outlet after temperature rise, the medium-temperature circulating water in the first heat exchanger exchanges heat and then is cooled to be low-temperature circulating water, and the low-temperature circulating water flows back to the water side of the gas cooler through a water return pipeline.

Further, the air inlet comprises an indoor return air inlet and an outdoor fresh air inlet, and the indoor return air and the outdoor fresh air enter the air channel of the air heat exchange unit from the indoor return air inlet and the outdoor fresh air inlet respectively and are mixed and then exchange heat with medium-temperature circulating water in the first heat exchanger.

Further, the air heat exchange unit further comprises a first fan, the first fan is arranged in the air heat exchange unit and used for accelerating low-temperature air convection so as to enhance heat exchange between low-temperature air and medium-temperature circulating water in the first heat exchanger.

Further, the gas cooler also comprises a second heat exchanger, the second heat exchanger is arranged between the heat supply unit and the water return pipeline, the medium-temperature circulating water flowing out of the heat supply unit flows into the second heat exchanger for heat exchange, and the low-temperature circulating water cooled after heat exchange by the second heat exchanger flows back to the water side of the gas cooler through the water return pipeline.

Further, still include first pipeline, second pipeline and water tank, first pipeline, second heat exchanger and second pipeline connect gradually and form the return circuit, and the water in the water tank flows back to the water tank through the second pipeline after the medium temperature circulating water heat transfer in first pipeline and the second heat exchanger heaies up to heat the water in the water tank to set temperature, the medium temperature circulating water in the second heat exchanger cools down to low temperature circulating water after heat transfer, and low temperature circulating water flows back to the water side of gas cooler through the return pipe way.

Further, a water supplementing port and a water outlet are arranged on the water tank, the water supplementing port is connected with tap water to supplement water quantity in the water tank, and the water outlet is connected with a water position to provide domestic hot water.

Further, still include first water pump, first water pump setting is on first pipeline, and the water in the water tank is passed through first water pump and is followed the water tank pump and is gone into in the second heat exchanger, with the medium temperature circulating water heat transfer in the second heat exchanger.

Further, the heat supply system further comprises a three-way proportional valve, wherein the three-way proportional valve is arranged at the water outlet of the heat supply unit and is used for adjusting the flow of medium-temperature circulating water entering the first heat exchanger and the second heat exchanger.

Further, the heat supply unit is a radiating fin and/or a floor heating coil.

The carbon dioxide heat pump heating system has the following advantages:

The carbon dioxide side of the gas cooler, the throttle valve and the air heat exchanger are sequentially connected to form a carbon dioxide circulation loop, the heat supply pipeline, the heat supply unit, the first heat exchanger, the water return pipeline and the water side of the gas cooler are sequentially connected to form a water circulation loop, after the carbon dioxide side of the gas cooler and the water side of the gas cooler are subjected to heat exchange, high-temperature circulating water flowing out of the water side of the gas cooler sequentially flows into the heat supply unit to supply heat through the heat supply pipeline, medium-temperature circulating water flowing out of the heat supply unit flows into the first heat exchanger to exchange heat, low-temperature circulating water cooled after heat exchange of the first heat exchanger flows back to the water side of the gas cooler through the water return pipeline, heat can be supplied to the heat supply unit through the first heat exchanger, the low-temperature circulating water after heat exchange flows back to the water side of the gas cooler through the water return pipeline, the performance of the carbon dioxide circulation loop can be improved, heat loss along the heat supply water circulation pipeline can be reduced, and energy-saving effect can be achieved.

Drawings

Fig. 1 is a schematic structural diagram of a carbon dioxide heat pump heating system according to the present utility model.

The figure indicates:

1. A compressor; 2. a gas cooler; 21. the carbon dioxide side of the gas cooler; 22. the water side of the gas cooler; 3. a throttle valve; 4. an air heat exchanger; 5. a second fan; 6. a heat preservation water tank; 7. a second water pump; 8. a heat supply unit; 81. a heat sink; 82. a floor heating coil; 83. a first regulating valve; 84. a second regulating valve; 9. a three-way proportional valve; 10. a first heat exchanger; 11. a second heat exchanger; 12. an air heat exchange unit; 121. an indoor air return port; 122. an outdoor fresh air port; 123. an air outlet; 124. a first fan; 13. a water supplementing port; 14. a water outlet; 15. a water tank; 16. a first water pump; 17. a first pipeline; 18. a second pipeline; 19. a heating pipeline; 20. and a water return pipeline.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments of the present utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to fall within the scope of the utility model.

In the description of the present utility model, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Wherein the terms "first position" and "second position" are two different positions.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art. In addition, the technical features of the different embodiments of the present utility model described below may be combined with each other as long as they do not collide with each other.

Those skilled in the art will appreciate that while some embodiments herein include some features but not others included in other embodiments, combinations of features of different embodiments are meant to be within the scope of the utility model and form different embodiments. For example, in the claims, any of the claimed embodiments may be used in any combination.

The carbon dioxide heat pump heating system of the present utility model is described below with reference to fig. 1.

When the existing carbon dioxide air source heat pump is applied to a heating system, the temperature of heat supply backwater is higher, and the heat is directly transferred into the gas cooler 2 of the carbon dioxide air source heat pump at the moment, so that the cycle performance COP of the carbon dioxide air source heat pump is extremely low. Therefore, there is a need to design a heat supply system of a carbon dioxide heat pump to solve the above-mentioned problem that the heat supply backwater temperature is high, resulting in low circulation performance of the carbon dioxide air source heat pump.

As shown in fig. 1, the heat supply system of the carbon dioxide heat pump in the utility model comprises a gas cooler 2, wherein one side of the gas cooler 2 is a carbon dioxide side, the other side of the gas cooler 2 is a water side, the heat pump further comprises a compressor 1, a throttle valve 3 and an air heat exchanger 4, the carbon dioxide side 21 of the gas cooler, the throttle valve 3 and the air heat exchanger 4 are sequentially connected to form a carbon dioxide circulation loop, the heat pump further comprises a heat supply pipeline 19, a heat supply unit 8, a first heat exchanger 10 and a water return pipeline 20, the heat supply pipeline 19, the heat supply unit 8, the first heat exchanger 10, the water return pipeline 20 and the water side 22 of the gas cooler are sequentially connected to form a water circulation loop, after heat exchange between the carbon dioxide side 21 of the gas cooler and the water side 22 of the gas cooler, high-temperature circulating water flowing out of the water side 22 of the gas cooler flows into the heat supply unit 8 through the heat supply pipeline 19, medium-temperature circulating water flowing out of the heat supply unit 8 flows into the first heat exchanger 10 for heat exchange, and low-temperature circulating water cooled by the heat exchange of the first heat exchanger 10 flows back to the water side 22 of the gas cooler through the water return pipeline 20.

The compressor 1, the carbon dioxide side 21 of the gas cooler, the throttle valve 3 and the air heat exchanger 4 are sequentially connected to form a carbon dioxide circulation loop, the heat supply pipeline 19, the heat supply unit 8, the first heat exchanger 10, the water return pipeline 20 and the water side 22 of the gas cooler are sequentially connected to form a water circulation loop, after the carbon dioxide side 21 of the gas cooler and the water side 22 of the gas cooler are subjected to heat exchange, high-temperature circulating water flowing out of the water side 22 of the gas cooler sequentially flows into the heat supply unit 8 through the heat supply pipeline 19 to supply heat, medium-temperature circulating water flowing out of the heat supply unit 8 flows into the first heat exchanger 10 to exchange heat, low-temperature circulating water cooled after heat exchange of the first heat exchanger 10 flows back to the water side 22 of the gas cooler through the water return pipeline 20 to supply heat, the low-temperature circulating water after heat exchange flows back to the water side 22 of the gas cooler through the water return pipeline 10, the performance of the carbon dioxide circulation loop can be improved, and meanwhile the heat loss of the water circulation pipeline along the water circulation pipeline can be reduced, so that an energy-saving effect is achieved.

Further, as shown in fig. 1, the first heat exchanger 10 is connected with an air heat exchange unit 12, an air inlet and an air outlet 123 are arranged on the air heat exchange unit 12, low-temperature air entering from the air inlet exchanges heat with medium-temperature circulating water in the first heat exchanger 10, hot air is discharged from the air outlet 123 after being heated, the medium-temperature circulating water in the first heat exchanger 10 exchanges heat and then is cooled to low-temperature circulating water, the low-temperature circulating water flows back to a water side 22 of the gas cooler through a water return pipeline 20 and exchanges heat with a carbon dioxide side 21 of the gas cooler again, the low-temperature circulating water flowing back to the water side 22 of the gas cooler can improve the performance of the carbon dioxide circulating loop, meanwhile, the heat loss along the heating water circulating pipeline can be reduced, and the energy saving effect is realized.

Further, as shown in fig. 1, the air inlet includes an indoor air return port 121 and an outdoor fresh air port 122, and the indoor air return port 121 and the outdoor fresh air respectively enter the air channel of the air heat exchange unit 12 from the indoor air return port 122 and the outdoor fresh air port 122 and then exchange heat with the medium-temperature circulating water in the first heat exchanger 10, and are discharged into the room from the air outlet 123 after being heated into hot air, so that the indoor temperature is increased, part of heat in the medium-temperature circulating water is recovered in the heat exchange process, and meanwhile, the outdoor fresh air is introduced, so that fresh air can be supplemented, and the air heat exchange temperature difference is reduced through indoor circulating air heat exchange, so that the comfort level of a human body is improved.

Further, as shown in fig. 1, the air heat exchange unit 12 further includes a first fan 124, where the first fan 124 is disposed in the air heat exchange unit 12, and the first fan 124 is used to accelerate low-temperature air convection, so as to enhance heat exchange between low-temperature air and medium-temperature circulating water in the first heat exchanger 10, after the medium-temperature circulating water exchanges heat with the low-temperature air, the low-temperature air heats up and is discharged from the air outlet 123 into the room, the medium-temperature circulating water becomes low-temperature circulating water, the low-temperature circulating water flows back to the water side 22 of the gas cooler through the water return pipeline 20, and exchanges heat with the carbon dioxide side 21 of the gas cooler again, and the low-temperature circulating water flowing back to the water side 22 of the gas cooler can improve performance of the carbon dioxide circulating loop, and can reduce heat loss along the heating water circulating pipeline, so as to achieve an energy-saving effect.

Further, as shown in fig. 1, the carbon dioxide heat pump heat supply system in the utility model further comprises a second heat exchanger 11, the second heat exchanger 11 is arranged between the heat supply unit 8 and the water return pipeline 20, the medium temperature circulating water flowing out of the heat supply unit 8 flows into the second heat exchanger 11 for heat exchange, the low temperature circulating water cooled after heat exchange by the second heat exchanger 11 flows back to the water side 22 of the gas cooler through the water return pipeline 20, heat exchange is carried out again with the carbon dioxide side 21 of the gas cooler, the low temperature circulating water flowing back to the water side 22 of the gas cooler can enable the performance of the carbon dioxide circulating loop to be improved, meanwhile, the heat loss along the heating water circulating pipeline can be reduced, and the energy saving effect is achieved.

Further, as shown in fig. 1, the carbon dioxide heat pump heating system in the utility model further comprises a first pipeline 17, a second pipeline 18 and a water tank 15, wherein the water tank 15, the first pipeline 17, the second heat exchanger 11 and the second pipeline 18 are sequentially connected to form a loop, water in the water tank 15 flows back into the water tank 15 through the second pipeline 18 after being subjected to heat exchange and temperature rise with middle-temperature circulating water in the second heat exchanger 11 through the first pipeline 17 so as to heat the water in the water tank 15 to a set temperature, the middle-temperature circulating water in the second heat exchanger 11 is subjected to heat exchange and then is cooled to be low-temperature circulating water, and the low-temperature circulating water flows back to the water side 22 of the gas cooler through a water return pipeline 20.

Further, as shown in fig. 1, a water supplementing port 13 and a water outlet 14 are arranged on the water tank 15, the water supplementing port 13 is connected with tap water to supplement the water quantity in the water tank 15, and the water outlet 14 is connected with a water position to provide domestic hot water. The carbon dioxide heat pump heating system further comprises a first water pump 16, the first water pump 16 is arranged on a first pipeline 17, and water in the water tank 15 is pumped into the second heat exchanger 11 from the water tank 15 through the first water pump 16 and exchanges heat with medium-temperature circulating water in the second heat exchanger 11. In this embodiment, the water tank 15, the first water pump 16, the first pipe 17, the second heat exchanger 11 and the second pipe 18 constitute a hot water heat exchange unit. In this embodiment, the air heat exchange unit 12 and the hot water heat exchange unit achieve two different functions while reducing the temperature of the backwater, and multiple groups of heat exchange units, namely multiple groups of air heat exchange units 12 or multiple groups of hot water heat exchange units, can be arranged in the carbon dioxide heat pump heat supply system in parallel.

Further, as shown in fig. 1, the carbon dioxide heat pump heating system of the present utility model further comprises a three-way proportional valve 9, wherein the three-way proportional valve 9 is disposed at the water outlet of the heating unit 8, and the three-way proportional valve 9 is used for adjusting the flow rate of medium temperature circulating water entering the first heat exchanger 10 and the second heat exchanger 11. Specifically, in this embodiment, the three-way proportional valve 9 adjusts the flow of the medium-temperature circulating water entering the first heat exchanger 10 and the second heat exchanger 11 according to the temperature difference between the set temperature and the real-time temperature fed back by the sensor, so as to ensure that the water in the water tank 15 reaches the set temperature and is in a constant-temperature state. The medium-temperature circulating water flowing out of the three-way proportional valve 9 flows into the first heat exchanger 10 and the second heat exchanger 11 respectively, the medium-temperature circulating water is changed into low-temperature circulating water after heat exchange and temperature reduction, and the low-temperature circulating water returns to the water side 22 of the gas cooler for heat exchange and temperature rise, so that a heating water circulation loop is formed. By reducing the water temperature of the water side 22 entering the gas cooler, the operation performance of the carbon dioxide heat pump system can be improved, and the energy saving effect can be achieved. In this embodiment, a first heat exchanger 10 and a second heat exchanger 11 may be provided, and a three-way proportional valve 9 is used to control the flow rate of the medium-temperature circulating water entering the first heat exchanger 10 and the flow rate of the medium-temperature circulating water entering the second heat exchanger 11.

After the high-temperature circulating water is subjected to heat exchange and temperature reduction through the heat supply unit 8, the medium-temperature circulating water flows out, is regulated through the three-way proportional valve 9, part of the medium-temperature circulating water enters the second heat exchanger 11, a water supplementing valve is arranged on the water tank 15 and between tap water, the tap water enters the water tank through the water supplementing valve, the second heat exchanger 11 is pumped into the water tank through the first water pump 16, the temperature of the tap water is raised after heat exchange and returns to the water tank 15, the water in the water tank 15 is heated to the required set temperature, and hot water in the water tank 15 is conveyed to various water positions through the water outlet 14 so as to provide domestic hot water.

Further, as shown in fig. 1, the heat supply unit 8 is a heat sink 81 and/or a floor heating coil 82. In this embodiment, the heat supply unit 8 is a heat dissipation fin 81, one end of the heat dissipation fin 81 is connected with the heat supply pipeline 19, the other end of the heat dissipation fin 81 is connected with the three-way proportional valve 9, and the flowing medium-temperature circulating water in the heat dissipation fin 81 flows into the first heat exchanger 10 and the second heat exchanger 11 respectively through the three-way proportional valve 9, so that the number of the heat dissipation fins 81 can be one or a plurality of heat dissipation fins can be set according to actual conditions. In other embodiments, the heat supply unit 8 is a floor heating coil 82, one end of the floor heating coil 82 is connected to the heat supply pipeline 19, the other end of the floor heating coil 82 is connected to the three-way proportional valve 9, and the medium-temperature circulating water flowing out of the floor heating coil 82 flows into the first heat exchanger 10 and the second heat exchanger 11 through the three-way proportional valve 9, so that the number of the floor heating coils 82 may be one or may be multiple according to practical situations. In other embodiments, the heat supply unit 8 may include both a heat sink 81 and a floor heating coil 82, where the heat sink 81 and the floor heating coil 82 are disposed in parallel between the heat supply pipeline 19 and the three-way proportional valve 9, and the number of the heat sink 81 and the floor heating coil 82 may be one or multiple according to practical situations. The high-temperature circulating water flowing out after heat exchange on the water side 22 of the gas cooler flows into the radiating fins 81 and the floor heating coil 82, and in order to control the flow of water in the radiating fins 81 and the floor heating coil 82, the carbon dioxide heat pump heat supply system further comprises a first regulating valve 83 and a second regulating valve 84, wherein the first regulating valve 83 is arranged between the heat supply pipeline 19 and the radiating fins 81, and the second regulating valve 84 is arranged between the heat supply pipeline 19 and the floor heating coil 82.

Further, as shown in fig. 1, the carbon dioxide heat pump heat supply system of the present utility model further includes a heat preservation water tank 6 and a second water pump 7, both the heat preservation water tank 6 and the second water pump 7 are disposed on a heat supply pipeline 19, and the second water pump 7 is disposed between the heat preservation water tank 6 and the heat supply unit 8. The high-temperature circulating water in the heat supply line 19 is flowed into the heat radiating fins 81 and the floor heating coil 82 by the second water pump 7.

Further, as shown in fig. 1, the carbon dioxide heat pump heating system in the utility model further comprises a second fan 5, the second fan 5 is arranged at the air heat exchanger 4, in this embodiment, a carbon dioxide circulation loop is formed by the compressor 1, the carbon dioxide side 21 of the gas cooler, the throttle valve 3 and the air heat exchanger 4, the compressor 1 compresses carbon dioxide into high-temperature high-pressure gas, the high-pressure gas enters the carbon dioxide side 21 of the gas cooler to exchange heat with the water side 22 of the gas cooler, the low-temperature low-pressure two-phase state is formed by the pressure reduction of the cooled carbon dioxide through the throttle valve 3, and the cooled carbon dioxide enters the air heat exchanger 4 to exchange heat with air, and returns to the compressor 1 to be compressed again after the cooled carbon dioxide is changed into a gas state, so as to form a circulation. The second fan 5 enhances air convection, and is beneficial to improving the heat exchange efficiency of carbon dioxide and air.

Through setting up first heat exchanger 10 and second heat exchanger 11, reduce the return water temperature in the heating circulating water return circuit after the medium temperature circulating water in the first heat exchanger 10 exchanges heat with indoor return air and outdoor new trend, reduce the return water temperature in the heating circulating water return circuit after the medium temperature circulating water in the second heat exchanger 11 exchanges heat with the water in the water tank 15, through reducing the return water temperature in the heating circulating water return circuit, can make carbon dioxide heat pump cycle's performance COP obtain promoting, can reduce the heat loss on the way of heating circulating water return circuit's pipeline simultaneously, finally realize energy-conserving purpose.

It is to be understood that the above examples of the present utility model are provided for clarity of illustration only and are not limiting of the embodiments of the present utility model. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the utility model are desired to be protected by the following claims.

Claims (10)

1. The utility model provides a carbon dioxide heat pump heating system, a serial communication port, including the gas cooler, gas cooler one side is the carbon dioxide side, gas cooler opposite side is the water side, still include the compressor, choke valve and air heat exchanger, the carbon dioxide side of compressor, gas cooler, choke valve and air heat exchanger connect gradually and form the carbon dioxide circulation loop, still include the heating line, the heating unit, first heat exchanger and return water pipeline, the heating line, the heating unit, first heat exchanger, return water pipeline and gas cooler's water side connect gradually and form the water circulation loop, after gas cooler's carbon dioxide side and gas cooler's water side heat exchange, the hot circulating water of gas cooler's water side outflow flows into the heating unit heat supply through the heating line, the hot circulating water of heat supply unit outflow flows into heat exchanger in the heat exchange, the low temperature circulating water that cools down after the heat exchange of first heat exchanger flows back to gas cooler's water side through the return water pipeline.

2. The heat supply system of the carbon dioxide heat pump according to claim 1, wherein the first heat exchanger is connected with an air heat exchange unit, an air inlet and an air outlet are arranged on the air heat exchange unit, low-temperature air entering through the air inlet exchanges heat with medium-temperature circulating water in the first heat exchanger, hot air is discharged from the air outlet after temperature rise, the medium-temperature circulating water in the first heat exchanger exchanges heat and then is cooled to low-temperature circulating water, and the low-temperature circulating water flows back to the water side of the gas cooler through a water return pipeline.

3. The carbon dioxide heat pump heating system according to claim 2, wherein the air inlet comprises an indoor return air inlet and an outdoor fresh air inlet, and the indoor return air and the outdoor fresh air enter the air channel of the air heat exchange unit from the indoor return air inlet and the outdoor fresh air inlet respectively and are mixed and then exchange heat with the medium-temperature circulating water in the first heat exchanger.

4. The carbon dioxide heat pump heating system of claim 2, wherein the air heat exchange unit further comprises a first fan disposed in the air heat exchange unit, the first fan configured to accelerate convection of low temperature air to enhance heat exchange between the low temperature air and the medium temperature circulating water in the first heat exchanger.

5. The heat supply system of the carbon dioxide heat pump according to claim 1, further comprising a second heat exchanger, wherein the second heat exchanger is arranged between the heat supply unit and the water return pipeline, the medium-temperature circulating water flowing out of the heat supply unit flows into the second heat exchanger for heat exchange, and the low-temperature circulating water cooled after heat exchange by the second heat exchanger flows back to the water side of the gas cooler through the water return pipeline.

6. The heat pump heating system of claim 5, further comprising a first pipeline, a second pipeline and a water tank, wherein the water tank, the first pipeline, the second heat exchanger and the second pipeline are sequentially connected to form a loop, water in the water tank flows back into the water tank through the second pipeline after heat exchange and temperature rise of the medium-temperature circulating water in the first pipeline and the second heat exchanger so as to heat the water in the water tank to a set temperature, the medium-temperature circulating water in the second heat exchanger is cooled to low-temperature circulating water after heat exchange, and the low-temperature circulating water flows back to the water side of the gas cooler through the water return pipeline.

7. The carbon dioxide heat pump heating system according to claim 6, wherein a water supply port and a water outlet are provided on the water tank, the water supply port is connected with tap water to supply water in the water tank, and the water outlet is connected with a water point to supply domestic hot water.

8. The carbon dioxide heat pump heating system of claim 6, further comprising a first water pump disposed on the first pipeline, water in the water tank being pumped from the water tank into the second heat exchanger by the first water pump to exchange heat with the medium temperature circulating water in the second heat exchanger.

9. The carbon dioxide heat pump heating system of claim 5, further comprising a three-way proportional valve disposed at the water outlet of the heating unit, the three-way proportional valve being configured to regulate the flow of medium temperature circulating water into the first heat exchanger and the second heat exchanger.

10. A carbon dioxide heat pump heating system according to claim 1, wherein the heating unit is a heat sink and/or a floor heating coil.