Carbon dioxide heat pump system suitable for hot water and heat supply of hotels and swimming pools

Abstract

The utility model discloses a carbon dioxide heat pump system suitable for hot water and heat supply of hotels and swimming pools. The carbon dioxide heat pump system comprises a carbon dioxide heating circulation loop, an inner circulation water way, a hot water way and a heat supply water way which are formed by connecting pipelines. The carbon dioxide heating circulation loop comprises a gas cooler, and the gas cooler is provided with a circulating cooling water path; the internal circulation water path comprises a hot water heat exchanger, a heating heat exchanger and a preheater, the hot water heat exchanger and the heating heat exchanger are connected in series or in parallel, and the preheater is arranged on a communicating pipeline of a cold water outlet of the heating heat exchanger and the circulation cooling water path of the gas cooler; the hot water path communicates with a cold water inlet and a hot water outlet of the hot water heat exchanger; the heating waterway communicates with a cold water inlet and a hot water outlet of the heating heat exchanger. The carbon dioxide heat pump system is specially designed for building heating with multiple heating requirements in northern areas, and is suitable for hot water, heating and swimming pools in hotels by efficiently utilizing a carbon dioxide transcritical heat pump system in a hotel scene.

Description

TECHNICAL FIELD

[0001] The utility model relates to refrigeration heating technical field, concretely is a kind of carbon dioxide heat pump system suitable for hotel hot water, heating, swimming pool. BACKGROUND

[0002] Carbon dioxide refrigerant is known by refrigeration, heating field with its green environmental protection, safety, stability, has good thermodynamic characteristics, and unit volume refrigeration capacity etc., carbon dioxide is in supercritical state, its temperature slip and water temperature rise trend keep high consistency, so that carbon dioxide transcritical heat pump system can easily obtain 70~90 ℃ high temperature hot water, and all-year operation average COP is above 4.0.

[0003] But carbon dioxide transcritical heat pump system is applied to large building comprehensive application scene such as hotel, on the one hand, carbon dioxide heat pump system is used for heating system, due to the high temperature of return water, generally 45 ℃ or so, make carbon dioxide high efficiency characteristics difficult to play, lead to high investment, long payback period;On the other hand, different working conditions need to be met, such as hotel heating, hot water supply, swimming pool constant temperature, season switching separately supply hot water, and separate heating, separately supply swimming pool etc.

[0004] Therefore, it is needed to design a kind of efficient carbon dioxide heat pump heating scheme to solve the above problems. UTILITY MODEL CONTENT

[0005] The utility model aims at solving the existing carbon dioxide transcritical heat pump system applied to large building comprehensive application scene such as hotel, carbon dioxide high efficiency characteristics difficult to play, lead to high investment, long payback period, simultaneously need to meet the demand of multiple different working conditions of hotel, provide a kind of design specially for the heating demand building heating of northern region, efficiently utilize carbon dioxide transcritical heat pump system in hotel scene The carbon dioxide heat pump system suitable for hotel hot water, heating, swimming pool.

[0006] To achieve the above object, the utility model provides the following technical scheme:

[0007] The utility model provides a kind of carbon dioxide heat pump system suitable for hotel hot water, heating, swimming pool, the carbon dioxide heat pump system includes that carbon dioxide heating circulation loop is formed by pipeline connection, internal circulation waterway, hot water waterway, heating waterway;The carbon dioxide heating circulation loop includes gas cooler, and the gas cooler is equipped with circulating cooling waterway;The internal circulation waterway includes hot water heat exchanger, heating heat exchanger, preheater, and the hot water heat exchanger, heating heat exchanger is equipped with hot water inlet, cold water outlet, cold water inlet, hot water outlet respectively, and the hot water heat exchanger, heating heat exchanger are connected with the circulating cooling waterway of gas cooler, and the hot water inlet of hot water heat exchanger, cold water outlet and the hot water inlet of heating heat exchanger, cold water outlet are connected in series or in parallel, and the preheater is located on the cold water outlet of heating heat exchanger and the circulating cooling waterway connecting pipe of gas cooler;The hot water waterway is connected with the cold water inlet of hot water heat exchanger, hot water outlet;The heating waterway is connected with the cold water inlet of heating heat exchanger, hot water outlet.

[0008] The utility model discloses a kind of carbon dioxide heat pump system suitable for hotel hot water, heating, swimming pool, the carbon dioxide heat pump system includes that carbon dioxide heating circulation loop is formed by pipeline connection, internal circulation waterway, hot water waterway, heating waterway;The carbon dioxide heating circulation loop includes gas cooler, and the gas cooler is equipped with circulating cooling waterway;The internal circulation waterway includes hot water heat exchanger, heating heat exchanger, preheater, and the hot water heat exchanger, heating heat exchanger is equipped with hot water inlet, cold water outlet, cold water inlet, hot water outlet respectively, and the hot water heat exchanger, heating heat exchanger are connected with the circulating cooling waterway of gas cooler, and the hot water inlet of hot water heat exchanger, cold water outlet and the hot water inlet of heating heat exchanger, cold water outlet are connected in series or in parallel, and the preheater is located on the cold water outlet of heating heat exchanger and the circulating cooling waterway connecting pipe of gas cooler;The hot water waterway is connected with the cold water inlet of hot water heat exchanger, hot water outlet;The heating waterway is connected with the cold water inlet of heating heat exchanger, hot water outlet.

[0009] As preferred scheme of the utility model, the carbon dioxide heating circulation loop includes CO2 transcritical compressor, gas cooler, gas-liquid separator, regenerator, evaporator, electronic expansion valve.The utility model discloses a kind of carbon dioxide heating circulation loop's component parts, and component part is connected by pipeline and forms a recyclable carbon dioxide loop.

[0010] As the preferred scheme of the utility model, the high-temperature and high-pressure carbon dioxide gas compressed by the CO2 transcritical compressor enters the gas cooler and exchanges heat with water through the exhaust valve, the high-temperature and high-pressure carbon dioxide gas is cooled, the water flowing through the gas cooler is heated, the gas cooler is communicated with the gas-liquid separator, the cooled carbon dioxide gas enters the gas-liquid separator, the gas-liquid separator is communicated with the regenerator, the regenerator is respectively communicated with the evaporator and the CO2 transcritical compressor, the separated high-pressure liquid exchanges heat again with the low-temperature and low-pressure carbon dioxide at the outlet of the evaporator in the regenerator, the high-pressure carbon dioxide is cooled and then throttled through the electronic expansion valve to become low-temperature and low-pressure carbon dioxide, the two-phase state carbon dioxide absorbs external heat in the evaporator and then flows into the regenerator, the low-pressure carbon dioxide in the regenerator is heated to become superheated gas and returns to the CO2 transcritical compressor.

[0011] As the preferred scheme of the utility model, when the hot water inlet and the cold water outlet of the hot water heat exchanger and the hot water inlet and the cold water outlet of the heating heat exchanger are connected in series, the water flowing through the gas cooler in the internal circulation water circuit is heated by the supercritical state carbon dioxide, and then sequentially exchanges heat with the hot water circuit and the heating water circuit in the hot water heat exchanger and the heating heat exchanger respectively, and then enters the preheater to preheat the tap water, thereby reducing the internal circulation return water temperature and increasing the inlet water temperature of the hot water heat exchanger, and thus completing a heat exchange cycle.

[0012] As the preferred scheme of the utility model, when the hot water inlet and the cold water outlet of the hot water heat exchanger and the hot water inlet and the cold water outlet of the heating heat exchanger are connected in parallel, the water flowing through the gas cooler in the internal circulation water circuit is heated by the supercritical state carbon dioxide, and then is divided into two water circuits, one of which enters the hot water heat exchanger to exchange heat with the hot water circuit, and the other of which enters the heating heat exchanger to exchange heat with the heating water circuit and then enters the preheater to preheat the tap water, thereby reducing the internal circulation return water temperature and increasing the inlet water temperature of the hot water heat exchanger, and thus completing a heat exchange cycle.

[0013] As the preferred scheme of the utility model, the internal circulation water circuit comprises a mechanical supercooling evaporator and a mechanical supercooling condenser, the mechanical supercooling evaporator is arranged on the circulating cooling water circuit communication pipeline between the preheater and the gas cooler, the mechanical supercooling condenser is connected in parallel with the cold water inlet and the hot water outlet of the heating heat exchanger, and the mechanical supercooling evaporator and the mechanical supercooling condenser are connected with the freon compressor and the freon liquid accumulator to form a mechanical supercooling circulation circuit.

[0014] As the preferred scheme of the utility model, the temperature of the return water pipeline in the inner circulation water path is high, and the mechanical supercooling cycle is started; the temperature of the return water pipeline in the inner circulation water path is low, and the mechanical supercooling cycle is stopped; when starting, the high-temperature and high-pressure liquid in the mechanical supercooling cycle circuit passes through the throttling of the mechanical supercooling electronic expansion valve through the pipeline, becomes low-temperature and low-pressure gas, absorbs the heat of the inner circulation water path in the mechanical supercooling evaporator, and returns to the freon compressor to be compressed into high-temperature and high-pressure gas, enters the mechanical supercooling condenser to be condensed into high-temperature and high-pressure liquid again to the pipeline, and thus a mechanical supercooling cycle is completed.

[0015] As the preferred scheme of the utility model, the water in the hot water path passes through the water pump and the water path, is heated to 60-80 DEG C by the water in the inner circulation in the preheater and the hot water heat exchanger, and is discharged to each room from the water path to provide hot water for each room and the swimming pool.

[0016] As the preferred scheme of the utility model, the cold water returned from the room floor heating pipeline passes through the water pump and the water path, is heated to 50-55 DEG C by the water in the inner circulation in the mechanical supercooling condenser and the heating heat exchanger, and is supplied to the room from the water path.

[0017] As the preferred scheme of the utility model, the preheater and the circulating cooling water path communication pipeline of the gas cooler are provided with an expansion tank. The expansion tank is used for supplementing sufficient water into the circulating cooling water path in time when the water pressure of the circulating cooling water path is insufficient.

[0018] The application is a kind of high-efficiency carbon dioxide heat pump heating scheme, and the product is specially designed for the heating demand of buildings in northern regions; on the one hand, the hot water heat exchanger and the heating heat exchanger are designed in series / parallel two heating schemes, the hot water heat exchanger and the heating heat exchanger are connected in series, the high-temperature demand is preferentially met, and then the low-temperature demand is met, the heat is used in stages, the heat is used to the maximum extent, and the comprehensive energy efficiency is high; the hot water heat exchanger and the heating heat exchanger are connected in parallel, the water distribution is accurately controlled according to the load ratio, and the heat demand is met; on the one hand, the mechanical supercooling is designed to effectively recover the heat of the return water, and the newly generated heat is supplemented to the heating water; on the other hand, the preheater is designed to reduce the return water temperature and increase the hot water supply flow; the three methods form a kind of high-efficiency carbon dioxide heat pump heating scheme.

[0019] In summary, the technical effects and advantages of the utility model are as follows: the series system uses the heat pump heat energy in stages, improves the utilization efficiency, compared with a single hot water or heating system, the application is a kind of comprehensive solution, which is suitable for large service buildings such as hotels, apartments and shopping malls; the preheating further transfers the heat generated by the heat pump to the hot water system, increases the hot water supply flow, and improves the utilization efficiency; the mechanical supercooling further transfers the heat generated by the heat pump to the heating system; the inner circulation system is adopted, the possibility of scale formation of the heat exchanger is reduced, and the service life of the equipment is improved.BRIEF DESCRIPTION OF DRAWINGS BRIEF DESCRIPTION OF DRAWINGS

[0020] Fig. 1 A kind of pipe connection structure schematic view for the hot water heat exchanger, heating heat exchanger series connection of the utility model.

[0021] Fig. 2 A kind of pipe connection structure schematic view for the hot water heat exchanger, heating heat exchanger parallel connection of the utility model.

[0022] Fig. 3 A kind of pipe connection structure schematic view for the mechanical supercooling cycle loop of the utility model.

[0023] In the drawing: 1, CO2 transcritical compressor 2, gas cooler 3, regenerator

[0024] 4, electronic expansion valve 5, evaporator 6, gas-liquid separator

[0025] 7, expansion tank 8, hot water heat exchanger 9, preheater

[0026] 10, mechanical supercooling evaporator 11, mechanical supercooling condenser

[0027] 12, heating heat exchanger 13, freon compressor 14, freon reservoir

[0028] 15, mechanical supercooling electronic expansion valve. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application.

[0030] Reference Figs. 1-3 ,

[0031] The application discloses a carbon dioxide heat pump system suitable for hotel hot water, heating and swimming pool, which comprises a carbon dioxide heating cycle loop formed by pipeline connection, an internal circulation waterway, a hot water waterway and a heating waterway; the carbon dioxide heating cycle loop comprises a gas cooler 2, and the gas cooler 2 is provided with a circulating cooling waterway; the internal circulation waterway comprises a hot water heat exchanger 8, a heating heat exchanger 12 and a preheater 9; the hot water heat exchanger 8 and the heating heat exchanger 12 are respectively provided with a hot water inlet, a cold water outlet, a cold water inlet and a hot water outlet; the hot water inlet and the cold water outlet of the hot water heat exchanger 8 and the hot water inlet and the cold water outlet of the heating heat exchanger 12 are connected in series or in parallel; the preheater 9 is arranged on a pipeline, through which the cold water outlet of the heating heat exchanger 12 is communicated with the circulating cooling waterway of the gas cooler 2; the hot water waterway is communicated with the cold water inlet and the hot water outlet of the hot water heat exchanger 8; and the heating waterway is communicated with the cold water inlet and the hot water outlet of the heating heat exchanger 12.

[0032] The carbon dioxide heating cycle loop comprises a CO2 transcritical compressor 1, a gas cooler 2, a gas-liquid separator 6, a regenerator 3, an evaporator 5 and an electronic expansion valve 4; the CO2 transcritical compressor 1, the gas cooler 2, the regenerator 3 and the evaporator 5 can be arranged as required, and one or two of them can be arranged; when two of them are arranged, they are arranged in parallel with each other; and the electronic expansion valve 4 is arranged in cooperation with the evaporator 5.

[0033] The internal circulation waterway comprises a mechanical supercooling evaporator 10 and a mechanical supercooling condenser 11; the mechanical supercooling evaporator 10 is arranged on a pipeline, through which the preheater 9 is communicated with the circulating cooling waterway of the gas cooler 2; the mechanical supercooling condenser 11 is connected in parallel with the cold water inlet and the hot water outlet of the heating heat exchanger 12; and the mechanical supercooling evaporator 10 and the mechanical supercooling condenser 11 are connected with a freon compressor 13 and a freon liquid accumulator 14 to form a mechanical supercooling cycle loop.

[0034] Water in the hot water waterway is heated to 60-80 DEG C by water in the internal circulation in the preheater 9 and the hot water heat exchanger 8 through a water pump and a waterway, and is discharged to each room from the waterway to provide hot water for each room and a swimming pool.

[0035] Cold water returned from a room floor heating pipeline in the heating waterway is heated to 50-55 DEG C by water in the internal circulation in the mechanical supercooling condenser 11 and the heating heat exchanger 12 through a water pump and a waterway, and is supplied to the room from the waterway.

[0036] An expansion tank 7 is arranged on the pipeline, through which the preheater 9 is communicated with the circulating cooling waterway of the gas cooler.

[0037] Specific use process: in the carbon dioxide heating cycle, the high-temperature and high-pressure carbon dioxide gas compressed by the CO2 transcritical compressor 1 enters the gas cooler 2 through the exhaust valve and exchanges heat with water, the high-temperature and high-pressure carbon dioxide gas is cooled, the water flowing through the gas cooler 2 is heated, the gas cooler 2 is connected with the gas-liquid separator 6, the cooled carbon dioxide gas enters the gas-liquid separator 6, the gas-liquid separator 6 is connected with the regenerator 3, the regenerator 3 is connected with the evaporator 5 and the CO2 transcritical compressor 1 respectively, the separated high-pressure liquid enters the regenerator 3 and exchanges heat with the low-temperature and low-pressure carbon dioxide at the outlet of the evaporator 5 again, the high-pressure carbon dioxide is cooled and becomes low-temperature and low-pressure carbon dioxide through the throttling of the electronic expansion valve 4, the two-phase carbon dioxide absorbs heat from the outside in the evaporator 5 and flows into the regenerator 3, the low-pressure carbon dioxide in the regenerator 3 is heated to become superheated gas and returns to the CO2 transcritical compressor 1.

[0038] When the hot water inlet and the cold water outlet of the hot water heat exchanger 8 are connected in series with the hot water inlet and the cold water outlet of the heating heat exchanger 12, the water flowing through the gas cooler 2 in the inner circulation water circuit is heated by the supercritical carbon dioxide, and then exchanges heat with the hot water circuit and the heating water circuit through the hot water heat exchanger 8 and the heating heat exchanger 12 respectively, and then enters the preheater 9 to preheat the tap water, thereby reducing the temperature of the inner circulation return water and increasing the temperature of the water inlet of the hot water heat exchanger 8, thereby completing a heat exchange cycle.

[0039] When the hot water inlet and the cold water outlet of the hot water heat exchanger 8 are connected in parallel with the hot water inlet and the cold water outlet of the heating heat exchanger 12, the water flowing through the gas cooler 2 in the inner circulation water circuit is heated by the supercritical carbon dioxide, and then is divided into two water circuits, one of which enters the hot water heat exchanger 8 to exchange heat with the hot water circuit, and the other of which enters the heating heat exchanger 12 to exchange heat with the heating water circuit and then enters the preheater 9 to preheat the tap water, thereby reducing the temperature of the inner circulation return water and increasing the temperature of the water inlet of the hot water heat exchanger 8, thereby completing a heat exchange cycle.

[0040] When the temperature of the return water pipeline in the inner circulation water circuit is high, the mechanical supercooling cycle is started, and when the temperature of the return water pipeline in the inner circulation water circuit is low, the mechanical supercooling cycle is stopped; when the temperature of the return water in the inner circulation water circuit is higher than 27℃ (which can be set and changed), the mechanical supercooling cycle is started, the high-temperature and high-pressure R134a or R410a liquid in the mechanical supercooling cycle circuit throttles through the mechanical supercooling electronic expansion valve 15 through the pipeline, becomes low-temperature and low-pressure gaseous R134a or R410a, absorbs the heat of the inner circulation water circuit in the mechanical supercooling evaporator 10, and returns to the freon compressor 13 to be compressed into high-temperature and high-pressure R134a or R410a gas, enters the mechanical supercooling condenser 11 to be condensed into high-temperature and high-pressure liquid, and then enters the pipeline again, thereby completing a mechanical supercooling cycle; when the temperature of the return water in the inner circulation water circuit is lower than 27℃ (which can be set and changed), the mechanical supercooling cycle is not started.

[0041] While the embodiments of the present application have been illustrated and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the spirit and scope of the present application, which should be limited only by the appended claims and their equivalents.

Claims

1. A carbon dioxide heat pump system suitable for hotel hot water, heating, and swimming pools, characterized in that: The carbon dioxide heat pump system includes a carbon dioxide heating circulation loop formed by pipe connections, an internal circulating water circuit, a hot water circuit, and a heating water circuit. The carbon dioxide heating cycle includes a gas cooler, which is equipped with a circulating cooling water circuit. The internal circulating water circuit includes a hot water heat exchanger, a heating heat exchanger, and a preheater. The hot water heat exchanger and the heating heat exchanger are respectively provided with a hot water inlet, a cold water outlet, a cold water inlet, and a hot water outlet. The hot water heat exchanger and the heating heat exchanger are connected to the circulating cooling water circuit of the gas cooler. The hot water inlet and cold water outlet of the hot water heat exchanger are connected in series or in parallel with the hot water inlet and cold water outlet of the heating heat exchanger. The preheater is located on the pipeline connecting the cold water outlet of the heating heat exchanger and the circulating cooling water circuit of the gas cooler. The hot water circuit is connected to the cold water inlet and hot water outlet of the hot water heat exchanger; The heating water circuit is connected to the cold water inlet and hot water outlet of the heating heat exchanger.

2. A carbon dioxide heat pump system suitable for hotel hot water, heating, and swimming pools according to claim 1, characterized in that: The carbon dioxide heating cycle includes a CO2 transcritical compressor, a gas cooler, a gas-liquid separator, a regenerator, an evaporator, and an electronic expansion valve.

3. A carbon dioxide heat pump system suitable for hotel hot water, heating, and swimming pools according to claim 2, characterized in that: In the aforementioned carbon dioxide heating cycle, the high-temperature, high-pressure carbon dioxide gas compressed by the transcritical CO2 compressor enters the gas cooler through the exhaust valve to exchange heat with water. The high-temperature, high-pressure carbon dioxide gas is cooled, and the water flowing through the gas cooler is heated. The gas cooler is connected to a gas-liquid separator, and the cooled carbon dioxide gas enters the gas-liquid separator. The gas-liquid separator is connected to a regenerator, which is connected to the evaporator and the transcritical CO2 compressor. The separated high-pressure liquid enters the regenerator and exchanges heat again with the low-temperature, low-pressure carbon dioxide at the evaporator outlet. After being cooled, the high-pressure carbon dioxide passes through the throttling of the electronic expansion valve and becomes low-temperature, low-pressure carbon dioxide. The two-phase carbon dioxide absorbs external heat in the evaporator and then flows into the regenerator. The carbon dioxide on the low-pressure side of the regenerator is heated into superheated gas and returns to the transcritical CO2 compressor.

4. A carbon dioxide heat pump system suitable for hotel hot water, heating, and swimming pools according to claim 1, characterized in that: When the hot water inlet and cold water outlet of the hot water heat exchanger are connected in series with the hot water inlet and cold water outlet of the heating heat exchanger, the water flowing through the gas cooler in the internal circulation water circuit is heated by supercritical carbon dioxide, and then passes through the hot water heat exchanger and the heating heat exchanger to exchange heat with the hot water circuit and the heating water circuit respectively. Then it enters the preheater to preheat the tap water, thereby reducing the temperature of the internal circulation return water and increasing the temperature of the inlet of the hot water heat exchanger, thus completing one heat exchange cycle.

5. A carbon dioxide heat pump system suitable for hotel hot water, heating, and swimming pools according to claim 1, characterized in that: When the hot water inlet and cold water outlet of the hot water heat exchanger are connected in parallel with the hot water inlet and cold water outlet of the heating heat exchanger, the water flowing through the gas cooler in the internal circulation water circuit is heated by supercritical carbon dioxide and then split into two water circuits. One circuit enters the hot water heat exchanger to exchange heat with the hot water circuit, and the other circuit enters the heating heat exchanger to exchange heat with the heating water circuit before entering the preheater to preheat the tap water. This lowers the temperature of the internal circulation return water while raising the temperature of the inlet of the hot water heat exchanger, thus completing one heat exchange cycle.

6. A carbon dioxide heat pump system suitable for hotel hot water, heating, and swimming pools according to claim 1, characterized in that: The internal circulating water circuit includes a mechanically subcooled evaporator and a mechanically subcooled condenser. The mechanically subcooled evaporator is located on the circulating cooling water connecting pipe between the preheater and the gas cooler. The mechanically subcooled condenser is connected in parallel with the cold water inlet and hot water outlet of the heating heat exchanger. The mechanically subcooled evaporator and the mechanically subcooled condenser are connected to the Freon compressor and the Freon receiver to form a mechanically subcooled circulating loop.

7. A carbon dioxide heat pump system suitable for hotel hot water, heating, and swimming pools according to claim 6, characterized in that: When the temperature of the return water pipe in the internal circulation water circuit is high, the mechanical subcooling cycle is started; when the temperature of the return water pipe in the internal circulation water circuit is low, the mechanical subcooling cycle is stopped. When started, the high-temperature and high-pressure liquid in the mechanical subcooling cycle circuit passes through the pipe and is throttled by the mechanical subcooling electronic expansion valve, becoming a low-temperature and low-pressure gas. After absorbing heat from the internal circulation water circuit in the mechanical subcooling evaporator, it returns to the Freon compressor and is compressed into a high-temperature and high-pressure gas. It then enters the mechanical subcooling condenser and is condensed into a high-temperature and high-pressure liquid before returning to the pipe, thus completing one mechanical subcooling cycle.

8. A carbon dioxide heat pump system suitable for hotel hot water, heating, and swimming pools according to claim 1, characterized in that: The water in the hot water circuit is heated to 60-80°C by the water in the internal circulation in the water pump and water circuit from the water supply tank, and then discharged from the water circuit to each room to provide hot water for each room and the swimming pool.

9. A carbon dioxide heat pump system suitable for hotel hot water, heating, and swimming pools according to claim 1, characterized in that: In the aforementioned heating water circuit, cold water returning from the room's underfloor heating pipes passes through a water pump and water circuit, and is heated to 50-55°C by the water in the internal circulation in the mechanical subcooling condenser and heating heat exchanger, and then supplied to the room for heating through the water circuit.

10. A carbon dioxide heat pump system suitable for hotel hot water, heating, and swimming pools according to claim 1, characterized in that: An expansion tank is installed on the circulating cooling water connecting the preheater and the gas cooler.

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