CN110762892A

CN110762892A - Solar energy combined cooling and heating dual-connection dual-supply system

Info

Publication number: CN110762892A
Application number: CN201910808377.2A
Authority: CN
Inventors: 刘�东; 王杰; 夏秋怡
Original assignee: Southwest University of Science and Technology
Current assignee: Southwest University of Science and Technology
Priority date: 2019-08-29
Filing date: 2019-08-29
Publication date: 2020-02-07

Abstract

The invention relates to a solar energy combined cooling and heating dual-supply system, which is characterized by comprising the following components: the system comprises a solar heat cycle unit (101), a gas heat cycle unit (201), an absorption refrigeration cycle unit (301), an air conditioning cycle unit (401) and a floor heating cycle unit (501); the start and stop of the solar thermal cycle unit and the gas thermal cycle unit are switched by controlling the switch of the corresponding electric valve; the solar heat circulation unit and the gas heat circulation unit are connected with the air conditioning circulation unit and the floor heating circulation unit in a mode that the solar heat circulation unit and the gas heat circulation unit are connected with each other through an absorption refrigeration unit or a heat supply water feeding pipe (9) and a heat supply water return pipe (10), the connection mode is selected by operating on an indoor temperature controller (26) and controlling the switch of a corresponding electric valve through a system controller (25), and therefore cooling or heating of a fan coil and floor heating is achieved.

Description

Solar energy combined cooling and heating dual-connection dual-supply system

Technical Field

The invention relates to a cooling and heating dual-supply system, in particular to a solar cooling and heating dual-supply system.

Background

With the continuous development of national economy of China, the living standard of urban and rural people is continuously improved, and along with the improvement of living conditions, the building energy consumption is rapidly increased. At present, building energy occupies nearly four times of energy consumption of the whole society, and the tension situation of energy supply is aggravated. Meanwhile, people experience poor environmental comfort degree for cooling and heating in winter and summer at present, particularly cooling in summer, and a common modern urban disease, namely air conditioning disease, is promoted. In order to reduce building energy consumption and create a healthy, comfortable, green and energy-saving living environment, relevant scientific researchers in China are working on optimizing the design of building equipment and expanding the application range of renewable energy sources in buildings. The expansion of the range of applications for clean energy on buildings is mainly the wider use of solar energy. Solar energy is an inexhaustible clean energy and one of important energy sources which can be relied on by human beings for a long time, and the solar heat energy is utilized to supply heat to buildings so as to obtain very good energy-saving and environmental benefits, and the solar energy is always paid attention to by countries in the world for a long time. In more than ten years, the technology of large-scale utilization of solar heat supply and heating in developed countries in Europe and North America is rapidly developed, a large number of regional heat supply and heating projects utilizing solar energy are built, and corresponding technical guides and design manuals are compiled and published. Solar energy in many areas of China is very abundant, and in order to fully utilize the natural energy, the technical specifications of solar heating engineering (GB 50495-2009) are jointly issued by the Ministry of construction and the State administration of quality supervision, inspection and quarantine in 2009 in 19 months (2009).

At present, more and more households in winter adopt floor radiation heating to replace air-conditioning heating in the aspect of building comfortable living room environment. This is because the radiant floor heating is more comfortable and has no wind sensation and noise than the air-conditioning heating. The technology for using the radiant floor heating in winter is very mature at present, but the technology for using the radiant floor cooling in summer is still being developed. This is because the problem of floor condensation is primarily solved by using floor radiation cooling. Two-way co-delivery is the mainstream solution to this problem. Floor radiation is the main cooling source for the room, and the fan coil is auxiliary, so the load of the fan coil is greatly reduced in the system. The main function of the fan coil is to remove indoor latent heat, i.e. dehumidification, besides auxiliary cooling, so that the problem of floor condensation is well solved. The two-combined-supply system is already available in the market, but an air source heat pump is adopted in the market for heating and refrigerating, so that the problem that two supplies cannot be provided for the floor is solved, and the energy consumption cost is high.

The radiant floor heating is more comfortable than the air conditioning heating, but the reaction time is longer than that of the air conditioning. In order to make the floor reaction faster, it is mainly from the direction of reducing the thermal resistance of the floor at present. Firstly, floor heating modularization is a great trend, for example, a design method of a floor heating module which is common in the current market is provided with the publication number of CN304827035S, but the design purpose of the floor heating module is mainly to facilitate construction and reduce maintenance cost. In addition, the thickness of the heat equalizing layer and the floor surface of the floor heating is continuously reduced, and the purpose of reducing the heat resistance is achieved by reducing the thickness of the floor surface and the heat equalizing layer. At present, a prefabricated floor heating plate is mainly used as a heat insulation layer, a groove on the prefabricated floor heating plate is used as a clamping pipe area, a water pipe is arranged after the heat equalization layer is attached, and the floor can be directly laid above the heat equalization layer, so that the construction is facilitated, and the heat resistance of floor radiation is greatly reduced, such a method is provided for example under the publication number of CN 206591767U.

Solar energy is an unstable heat source and can be affected by cloudy, rainy, and snowy weather. The supply of solar energy varies both quantitatively and temporally. The solar energy can be obtained only in the daytime, particularly in direct sunshine, and can be obtained only in sunny days, and the energy in life is concentrated in the morning and at night compared with the daytime. Therefore, most of the existing methods for heating by using solar energy involve heat storage devices, and for example, a method for heating in cold regions is provided under the publication number CN 203550015U. Also disclosed in publication CN206582938U is a radiant heating method for floor using solar energy combined with a heater, which realizes the complementation of solar energy and heater. However, the invention does not achieve the purpose of cold and hot supply.

Disclosure of Invention

Aiming at the problems, the invention designs a whole set of combined solar energy cold and warm dual-combined dual-supply system.

The system has the operation thought that: when a user selects a summer mode on the indoor temperature controller, the corresponding electric valve is opened or closed, the circulating water is heated by solar energy in the daytime so as to heat working media in the generator to enable the absorption refrigeration cycle to operate, and the circulating pipe where the stop valve (21) is located provides chilled water for the ultrathin floor heating and the fan coil to achieve the purpose of cold supply; the gas wall-mounted boiler provides heat source for the absorption refrigeration cycle at night, and the cycle cooling cycle is the same as that described above. When a user selects a winter mode on an indoor temperature controller, a solar thermal collector heats circulating water, supplies heat to the ultrathin floor heating and fan coil through a heat supply water supply pipe (9), and then returns water through a heat supply water return pipe (10); at night, the gas wall-mounted boiler heats circulating water, supplies heat to the ultrathin floor heating and fan coil through the heat supply water supply pipe (9), and then returns water through the heat supply water return pipe (10), so that the purpose of supplying heat day and night is achieved.

The indoor temperature controller has the functions of starting and stopping, switching the operation between the solar thermal circulation unit and the gas thermal circulation unit, independently controlling the starting and stopping of the fan coil and controlling the indoor temperature and humidity.

The fan coil can be independently closed to operate in winter and must operate in summer.

The solar heat collector is a vacuum solar heat collecting pipe.

The internal circulating working medium of the absorption refrigeration cycle is a lithium bromide solution.

Wherein, the absorption refrigeration cycle comprises a generator, a condenser, an evaporator and an absorber.

The sections of the generator, the condenser, the evaporator and the absorber tube are all copper tubes.

Wherein, the surface of the copper pipe is plated with a lithium chromate protective film.

The heat source of the generator is from solar hot circulating water and gas wall-mounted boiler gas hot circulating water.

The ultrathin floor heating comprises a floor, a water pipe, a heat equalizing layer and a heat insulating layer.

Wherein, the upper part of the heat-insulating layer is provided with a snake-shaped or clip-shaped or double-clip-shaped groove.

Wherein, the cross section of the groove is a semicircle with the diameter of the outer diameter of the water pipe.

The heat-equalizing layer is an aluminum foil heat-equalizing layer and is tightly attached to the heat-insulating layer.

The lower part of the floor is provided with a groove.

The shape of the groove is correspondingly superposed with the shape of the groove on the heat-insulating layer.

The water pipe is a graphene pipe or a copper pipe or a PE pipe.

Wherein, the water pipe is embedded and coiled in the groove between the floor and the heat-insulating layer.

The invention has the advantages that:

1. the floor cooling and the fan coil cooling are combined in summer, so that the problems of floor condensation and human head and foot cooling are solved, and the use time of the floor heating is further increased. 2. The floor heating is used as a main cold supply source in summer, so that the load of a fan is greatly reduced, and the indoor wind sense and noise are reduced, so that the indoor environment is more comfortable and healthy; the operation of completely closing the fan coil and the absorption type refrigerating device is realized in winter, and the energy consumption of the whole set of device is reduced. 3. The floor is closely attached to the heat equalizing layer and the water pipes in the newly designed ultrathin floor heating structure, and the water pipes are made of high-thermal-conductivity materials, so that the heat resistance of the floor heating structure is smaller, the starting is faster, and unnecessary energy waste is reduced along with the use. 4. The whole system introduces solar energy as supplementary energy, reduces the gas consumption and saves more energy; 5. compared with an absorption refrigerating unit adopting direct combustion of fuel gas as a heat source, the absorption refrigerating unit is safer and more reliable, and has lower investment cost and maintenance cost.

Drawings

Fig. 1 is a schematic diagram of a cooling and heating dual supply system according to an embodiment of the present invention.

In the figure: 1, a solar heat collector; 2, a solar heat circulating pipe; 3, exhausting the valve; 4 an electric valve; 5, a buffer heat-preservation water tank; 6, a water pump; 7, a gas wall-mounted furnace; 8, a gas heat circulation pipe; 9 a heat and water supply pipe; 10, a heat supply water return pipe; 11 a vacuum line; 12 a generator; 13 a condenser; 14 an evaporator; 15 an absorber; 16 pumps; 17 a heat exchanger; a throttle valve 18; 19 a pressure reducing valve; 20 cooling water pipes; 21 a stop valve; 22 a water dividing and collecting device; 23, a fan coil; 24, ultrathin floor heating; 25 a system controller; 26 indoor temperature controllers;

fig. 2 is a partial schematic view of a solar collector.

In the figure: 2, a solar heat circulating pipe; 5, a buffer heat-preservation water tank; 6, a water pump; 27 solar heat collecting tubes; 28 an insulating layer; 29 copper tubing.

Fig. 3 is a schematic view of an ultra-thin floor heating structure.

In the figure: 30, a floor board; 31 a water pipe; 32 aluminum foil heat-homogenizing layer; 33 an insulating layer.

Detailed Description

The invention is further illustrated, but not limited, by the following examples and figures.

In summer, the stop valve (21) is always in an open state. In the daytime, a user can control the indoor temperature controller (26) to enable the corresponding electric valve to be opened or closed, so that the absorption refrigeration cycle unit (301) uses solar thermal circulating water as the only heat source. The working medium solution with certain concentration conveyed from an absorber (15) to a generator (12) by a pump (16) is heated by hot water in a solar heat circulating pipe (2), low boiling point refrigerant in the solution is evaporated and enters a condenser (13) through a vacuum pipeline (11), the cooling water conveyed by a cooling water pipe (20) in the condenser is condensed into refrigerant liquid, the refrigerant liquid is reduced to evaporation pressure through a pressure reducing valve (19) and enters an evaporator (14), and the refrigerant liquid in the evaporator absorbs heat of water from an air conditioning circulating unit and a floor heating circulating unit, is excited into refrigerant vapor under the evaporation pressure and then enters the absorber (15) through the vacuum pipeline (11). The weak solution remaining from the process in the generator (12) is passed through a throttle valve (18) into an absorber (15) where it mixes with the low pressure refrigerant vapour exiting the evaporator (14) and absorbs the low pressure refrigerant vapour back to its original concentration. The water pump (6) drives the chilled water coming out of the pipe section in the evaporator (14), and the pipe section where the stop valve (21) is located provides chilled water for the air-conditioning circulation unit (401) and the floor heating circulation unit (501) through the corresponding pipe section and the water collecting and distributing device (22), so that the purpose of refrigeration and combined supply in summer is achieved. Furthermore, if the solar heat supply is insufficient in daytime, the system controller (25) can automatically control the opening and closing of the corresponding electric valve (4), so that the absorption refrigeration cycle unit (301) uses the solar hot circulating water and the wall-mounted boiler hot circulating water as heating sources, and the solar hot circulating water and the wall-mounted boiler hot circulating water jointly drive the absorption refrigeration device to operate, thereby achieving the purpose of cooling the room. At night, the switch of the corresponding electric valve can be changed, so that the absorption refrigeration cycle unit (301) drives the absorption refrigeration device to operate by taking the wall-hanging furnace hot circulating water as the only heat source, and can also supply cold for rooms. Because the cold working condition is mainly ground heating refrigeration and is assisted by the fan coil, the fan coil can be arranged very small and only needs to run at low speed.

In summer, tap water can be directly connected into the cooling water pipe (20). Further, if conditions allow, a heat-insulating water tank can be used for storing water for cooling the condenser and the absorber, and water can be taken from the heat-insulating water tank for heating at night or can be directly used for daily domestic water. Thus, the waste heat emitted by the absorption refrigeration device can be fully utilized to achieve the aim of saving energy. If the temperature of the chilled water supplied to the floor heating circulation unit and the air conditioning circulation unit is too low, the circulating water in the floor heating circulation unit in the cooling water pipe (20) can be used for preheating treatment, so that the phenomenon of indoor supercooling caused by too cold floor is prevented, and the supercooling phenomenon of the air conditioner does not need to be considered because the power of the air conditioning fan coil can be adjusted to be in a very low state and belongs to the role of auxiliary cooling.

In winter, the stop valve (21) is always in a closed state. Daytime, the switch of the corresponding electric valve (4) of user's accessible indoor temperature controller control is by solar energy direct heating hot water, sends hot water to air conditioner circulation unit and floor heating circulation unit through heat supply feed pipe (9), and is sent back water among the solar collector by hot water wet return (10) and reheats. Furthermore, if the solar energy is insufficient in heating in the daytime, the wall-mounted furnace is used for supplying heat, and the wall-mounted furnace are used for supplying heat together. And at night, the switch of the corresponding electric valve is controlled, and the wall-mounted furnace heats circulating water to supply heat for the air-conditioning circulating unit and the floor heating circulating unit. Furthermore, according to user's hobby, can pass through indoor temperature controller in winter and stop fan coil's operation alone, reduce the energy consumption, eliminate indoor wind sense and noise completely for indoor environment is more comfortable, healthy.

If the system is applied to alpine regions with rich solar resources, such as Qinghai-Tibet plateau of China, a heat-preservation and heat-storage water tank can be additionally arranged on a direct heat supply main pipe, namely a heat supply water supply pipe (9) or a heat supply water return pipe (10), of the solar heat circulation unit (101) and the gas heat circulation unit (201). Solar collector is main heat source daytime, and the supplementary heat supply of gas hanging stove, the circulating water of heating are stored in heat preservation heat accumulation water tank, both can be used for the heating evening, also can be used as other domestic water, reduce the use amount of gas, reach energy-conserving purpose. Furthermore, if the system is used in extremely cold areas, the floor heating structure can be filled with phase-change heat storage materials, when sunlight is sufficient in the daytime, circulating water heats the heat storage materials below the floor, heat is stored while a room is heated, and when the night comes, the phase-change materials below the floor can release the stored heat.

Besides the application in civil buildings, the invention can also be applied to large buildings such as: the building space of airport terminal building, train station bus station is big, the flow of people is big, energy consumption is big etc. in the public building. These buildings are characterized by domes of large area, which are the best place for placing solar collectors. The invention can now be applied very well to such buildings with a few modifications: namely, the wall-hanging boiler in the gas thermal cycle unit (201) is replaced with a gas boiler. In summer, the solar energy is used for driving the absorption refrigerating device by hot water or assisting in driving the absorption refrigerating device to run in the daytime, and chilled water is provided for the fan coil and the floor heating to achieve the purpose of cooling. At present, the heat sources of the absorption refrigerating units in large places are all provided by gas boilers and can not be extinguished at will, so that the load of the boilers and the gas consumption can be only reduced when solar energy is matched for cooling and heating in the daytime, and the purpose of energy conservation is achieved. Winter, solar energy is heated daytime, and gas boiler auxiliary heating's circulating water can be directly by ground warm and take the heat inside the building, also can cooperate fan coil to maintain the inside temperature of building. At night, the gas boiler is directly used as a heat source to supply heat for the building.

Because the public building is in large space and has no completely closed characteristic, the floor can not be prevented from dewing even if the fan coil operates in summer. In order to prevent the floor from dewing due to too low temperature, the cooling circulating water in the cooling water pipe (20) and the circulating water supplied to the floor heating circulating unit (501) can exchange heat, so that the temperature of the floor heating circulating water is increased, the water in the cooling pipe is reduced, the cooling effect of the cooling water pipe (20) on a condenser and an absorber in the absorption type refrigeration circulating unit (301) is enhanced, and the working efficiency of the absorption type refrigeration circulating unit is improved.

Further, the apparatus according to the invention can also be applied to environments with more extreme climate at high altitude, such as public buildings in the Tibet plateau. The solar energy resource in the area is extremely rich, but the temperature difference between day and night is large, and the average annual temperature is low, so that the problem of heating, particularly heating at night, is mainly solved in the area. The invention may now be applied with little modification to large buildings in such areas: namely, the absorption refrigeration cycle unit (301) is removed, and the ultra-thin floor heating in the floor heating cycle unit (501) is changed into phase change heat storage floor heating. In the daytime, the circulating water is heated by solar energy, and the gas boiler is used for assisting in heating, on one hand, the floor is directly heated to supply heat for the interior of the building, and on the other hand, the heat storage material is heated simultaneously to enable the heat storage material to generate phase change to store latent heat. At night, the latent heat stored in the heat storage material is released, and the gas boiler only needs to keep low power to operate and maintain the heat release temperature of the heat storage material, so that the working load can be reduced, and the gas consumption is reduced.

The invention can also be used in commercial buildings. The wall-mounted boiler in the gas thermal cycle unit (201) is replaced by a gas boiler, and solar energy is still used for auxiliary heating. The specific implementation mode is as follows: in summer, the solar heat collector heats circulating water to drive in the daytime, the gas boiler heats circulating water to assist in driving the operation of the absorption refrigeration cycle unit (301), and the water pump (6) sends chilled water into each room. In the process, the gas-fired boiler only needs to be kept in low-power operation. And driving the absorption refrigeration cycle unit to operate by taking a gas boiler as a unique heat source at night. Due to the density of people in the commercial buildings at night, the operation of the commercial buildings only needs to be kept at low power. When heating in winter, the auxiliary heating circulating water of the solar heating gas-fired boiler is respectively and directly fed into each room through each corresponding electric valve (4) in the daytime; at night, the gas boiler directly supplies heat. The key of the application scheme is the installation position of the heat collector. The solar heat collecting pipe can be arranged in an outdoor air-conditioning grid of a building to replace the original design of a shutter, and the problem can be well solved.

The foregoing is merely exemplary of the preferred embodiments of the present invention, and details which have not been set forth are within the ordinary skill in the art. The protection scope of the present invention is subject to the content of the claims, and any equivalent changes, such as equivalent devices replacing the common heat pipe and the solar vacuum heat collecting pipe, or the modification of the distance between the two and the distance between the several pipes per se, are also within the protection scope of the present invention.

Claims

1. A solar energy combined cooling and heating dual-supply system is characterized in that: the solar heat circulating unit consists of a solar heat collector (1), a solar heat circulating pipe (2), an exhaust valve (3), an electric valve (4), a buffer heat-preservation water tank (5) and a water pump (6); the gas wall-mounted boiler (7), the gas heat circulating pipe (8), the water pump (6) and the electric valve (4) form a gas heat circulating unit; the generator (12), the condenser (13), the evaporator (14), the absorber (15), the heat exchanger (17) and the pipeline and the component which connect all parts form an absorption refrigeration cycle unit together, a pump (16) is arranged on the pipeline of the absorber which leads to the generator, a throttle valve (18) is arranged on the pipeline of the generator which leads to the absorber, a pressure reducing valve (19) is arranged on the pipeline of the condenser which leads to the evaporator, and a cooling water pipe (20) sequentially passes through the condenser and the absorber; an air conditioning circulation unit is composed of the water collecting and distributing device (22), the fan coil (23) and corresponding pipelines, and an exhaust valve (3) is arranged at the highest position of the circulation pipe; the water collecting and collecting device (22), the ultrathin floor heating device (24) and corresponding pipelines form a floor heating circulating unit; through the operation of the indoor temperature controller (26), the system controller (25) sends out a control instruction, so that the circulation units run coordinately to achieve the purpose of cooling or heating;

the solar heat circulating unit comprises a solar heat collector (1), a solar heat circulating pipe (2), an exhaust valve (3), an electric valve (4), a buffer heat-preservation water tank (5) and a water pump (6), wherein two ends of the circulating pipe are respectively connected with an inlet and an outlet of a copper pipe above the solar heat collector, a circulating working medium in the pipe is water, the start and stop of the water pump are controlled by a system controller (25), the water in the buffer heat-preservation water tank is circulated to the solar heat collector by the pump on the circulating pipe to be heated, and hot water is led into a generator (12) in the absorption type refrigeration circulating device to be subjected to heat exchange after passing through the exhaust valve (3) and the electric valve (4) and then returns to the buffer heat-preservation water tank;

the gas heat circulation unit comprises a gas wall-mounted furnace (7), a gas heat circulation pipe (8), a water pump (6) and an electric valve (4), the gas heat circulation pipe is connected with a water inlet and a water outlet of the gas wall-mounted furnace, the water pump is installed near the water outlet of the gas wall-mounted furnace, hot water in the gas wall-mounted furnace starts from the water outlet, is pressurized by the water pump, flows into a pipe section in the generator (12) through the electric valve (4) and exchanges heat, and the pipe section flowing out of the generator returns to the gas wall-mounted furnace through the electric valve (4);

the absorption refrigeration cycle unit comprises a generator (12), a condenser (13), an evaporator (14), an absorber (15), a heat exchanger (17) and pipelines for connecting all parts, working medium solution in the generator completely submerges a hot water pipe in the generator, the working medium solution with certain concentration conveyed into the generator (12) from the absorber (15) is heated by using hot water in a solar heat circulating pipe (2) or a fuel gas heat circulating pipe (8) through a pump (16), low-boiling-point refrigerant in the solution is evaporated, the low-boiling-point refrigerant in the solution enters the condenser (13) through a vacuum pipeline (11), is condensed into refrigerant liquid by cooling water conveyed by a cooling water pipe (20) in the generator, is reduced to evaporation pressure through a pressure reducing valve (19) and enters the evaporator (14), the refrigerant liquid in the evaporator absorbs heat of water from an air conditioning cycle unit and a floor heating cycle unit, is excited into refrigerant vapor under the evaporation pressure, and then passes through the vacuum pipeline (11) Into an absorber (15). The rest diluted solution in the generator (12) in the generation process enters an absorber (15) through a throttle valve (18), is mixed with low-pressure refrigerant vapor from an evaporator (14), absorbs the low-pressure refrigerant vapor and recovers to the original concentration, and the steps are repeated in such a way to achieve the purposes of refrigeration and heating;

the air conditioner circulating unit comprises a water collecting and distributing device (22), a fan coil (23) and corresponding pipelines, and an exhaust valve (3) is arranged at the highest position of the circulating pipe; when the equipment is in a cold supply state, water flowing through the inner pipe section of the evaporator flows into a circulating pipe section leading to a fan coil and a floor heating coil under the pressure of a water pump (6) through a stop valve (21), circulating water flowing to the fan coil flows through a fan coil (23) through a water supply port of a water collector (22), exchanges heat with air and then passes through an exhaust valve (3), a water outlet of the water collector (22) and the stop valve (21) to complete air conditioner cold supply circulation; when the equipment is in a heating state, water heated by the solar heat circulation unit or the gas circulation unit is pressurized by the water pump (6) through the heat supply water supply pipe (9), flows to the fan coil (23) through the water supply opening of the water collector (22), exchanges heat with air in the fan coil, and then flows back to the solar heat circulation unit or the gas heat circulation unit through the heat supply water return pipe (10) to complete air conditioning and heating circulation;

the floor heating circulating unit comprises a water collecting and distributing device (22), an ultrathin floor heating device (24) and corresponding circulating pipe sections; when the equipment is in a cold supply state, water flowing through the inner pipe section of the evaporator is pressurized by the water pump (6) after passing through the stop valve (21), flows to the ultrathin floor heater (24) through the water supply port of the water collector (22) and carries out radiation heat exchange with the ground, and the floor cold supply circulation is completed through the water discharge port of the water collector (22) and the stop valve (21) after the heat exchange is carried out; when the equipment is in a heating state, water heated by the solar heat circulating unit or the gas circulating unit is pressurized by the water pump (6) through the heat supply water supply pipe (9), flows through the water supply opening of the water collecting and distributing device through the circulating pipe, and flows back to the solar heat circulating unit or the gas heat circulating unit through the heat supply water return pipe (10) after being subjected to heat radiation exchange in the ultra-thin floor heating to complete floor heating circulation.

2. The combined solar energy cooling and heating dual-supply system according to claim 1, wherein the indoor temperature controller (26) has functions of starting and stopping, switching operation between the solar thermal cycle unit and the gas thermal cycle unit, independently controlling starting and stopping of the fan coil, and controlling indoor temperature and humidity.

3. A combined solar combined cooling and heating cogeneration system according to claim 1, characterized in that said solar collector (1) is a vacuum solar collector tube.

4. A combined solar energy combined cooling and heating dual supply system according to claim 1, characterized in that the inner pipe sections of the generator (12), the condenser (13), the evaporator (14) and the absorber (15) are all copper pipes plated with lithium chromate protective film.

5. A combined solar energy combined cooling and heating dual supply system as claimed in claim 1, wherein the heat source of the generator is from solar hot circulating water and gas hot circulating water.

6. The combined solar energy cooling and heating dual-supply system according to claim 1, wherein the ultra-thin floor heating (24) comprises a floor, a water pipe, a heat equalizing layer and a heat insulating layer, wherein the upper part of the heat insulating layer is provided with a snake-shaped or zigzag-shaped or double-zigzag-shaped groove, the cross section of the groove is in a semicircle shape with the diameter equal to the outer diameter of the water pipe, the heat equalizing layer is an aluminum foil heat equalizing layer closely attached to the heat insulating layer, a semicircular groove with the cross section diameter equal to the outer diameter of the water pipe is arranged below the floor, the shape of the groove is correspondingly overlapped with the shape of the groove on the heat insulating layer, and the water pipe is a graphene pipe or a copper pipe or a PE pipe embedded and coiled in the groove between the floor and the heat insulating.

7. A combined solar energy combined cooling and heating dual supply system as claimed in claim 1, wherein said cooling water pipe (20) is connected with tap water or a heat preservation water tank.