Centralized intelligent control of multi-source carbon dioxide cooling and heating integrated system and control method

Abstract

The present invention discloses a multi-source carbon dioxide cooling and heating integrated system and control method with centralized intelligent control. The present invention includes a multi-source cooling and heating integrated unit, a short-term energy storage device, an air source cooling and heating integrated unit, a ground source storage and dispersion system, an air source air conditioning unit, an air source heat pump unit, a working fluid box and a server; it combines air sources, ground source storage systems and energy storage devices, and comprehensively optimizes and allocates various energy sources through a centralized intelligent control system, adopts transcritical carbon dioxide cooling and heating integrated technology, recycles multiple energy sources, and delivers different total amounts of heat to different demand terminals. The same energy supply closed loop simultaneously provides energy for the first type of user terminals and the second type of user terminals with different load demands to form a segmented energy supply, thereby achieving the operation goals of high efficiency, comfort and low energy consumption; the present invention will provide a green, efficient and economical cooling and heating solution for modern buildings and industrial facilities.

Description

Technical Field

[0001] The present invention relates to energy regulation technology, and in particular to a multi-source carbon dioxide cooling and heating integrated system with cross-seasonal energy storage and a control method thereof. Background Art

[0002] As the global warming problem becomes increasingly serious, reducing greenhouse gas emissions and improving energy efficiency have become urgent needs of today's society. Traditional integrated cooling and heating systems usually rely on refrigerants with high greenhouse effect potential (GWP) such as Freon, which not only causes serious pollution to the environment, but also has problems such as low energy efficiency and high operating costs. In order to solve these problems, a carbon dioxide (CO 2 ) as a green working fluid, the multi-source cooling and heating integrated system has important practical significance.

[0003] As a natural working fluid, carbon dioxide has the advantages of low GWP, non-toxicity, non-flammability, stable chemical properties, etc., and its critical temperature and pressure are suitable for the cold-heat conversion process. At the same time, the cold-heat integration of carbon dioxide can be used to store excess cold and heat energy in winter and summer, recycle and reuse it in the required period, fully transfer and effectively utilize excess cold in the heating season and excess heat in the non-heating season, and realize the multifunctional integrated operation of refrigeration, heating and thermal energy storage. Utilize centralized control technology to effectively integrate multiple energy sources, such as air sources, geothermal energy and energy storage, to further improve the overall energy efficiency and operational reliability of the system. Summary of the invention

[0004] In view of the environmental pollution and low energy efficiency problems of traditional integrated cooling and heating systems, the present invention proposes a centralized intelligent control multi-source carbon dioxide integrated cooling and heating system and a control method thereof, which is suitable for centralized control in different climate zones and stores and transfers energy in the form of heat, which not only helps to reduce greenhouse gas emissions and save energy, but also can achieve the goal of sustainable development through green working fluids and efficient energy management.

[0005] One object of the present invention is to provide a centralized intelligently controlled multi-source carbon dioxide cooling and heating integrated system.

[0006] The centralized intelligent control multi-source carbon dioxide cooling and heating integrated system of the present invention comprises: a multi-source cooling and heating integrated unit, a short-term energy storage device, an air source cooling and heating integrated unit, a ground source storage and dispersion system, an air source air conditioning unit, an air source heat pump unit, a working fluid box and a server; wherein, a first circulating pump is arranged on the pipeline at the outlet of the working fluid box, and the outlet of the working fluid box is connected to the energy supply inlet of the multi-source cooling and heating integrated unit through a pipeline; the energy supply outlet of the multi-source cooling and heating integrated unit is respectively connected to the inlet of the first type of user end and the first port of the short-term energy storage device through pipelines; the outlet of the first type of user end and the second port of the short-term energy storage device are respectively connected to the inlet of the working fluid box through pipelines; the environment end outlet of the multi-source cooling and heating integrated unit is connected to the inlet of the ground source storage and dispersion system through a second circulating pump via a pipeline; the outlet of the ground source storage and dispersion system is connected to the inlet of the air source cooling and heating integrated unit through a pipeline; the outlet of the air source cooling and heating integrated unit is connected to the multi-source cooling and heating integrated unit through a pipeline The environment end inlet of the group; the outlet of the working fluid box is connected to the energy supply inlet of the air source air-conditioning unit through a pipeline, the energy supply outlet of the air source air-conditioning unit is connected to the inlet of the second type of user end through a pipeline, and the outlet of the second type of user end is connected to the inlet of the working fluid box; the outlet of the working fluid box is connected to the energy supply inlet of the air source heat pump unit through a pipeline, the energy supply outlet of the air source heat pump unit is connected to the inlet of the second type of user end through a pipeline, and the outlet of the second type of user end is connected to the inlet of the working fluid box; the environment end inlet and environment outlet of the multi-source cooling and heating integrated unit, the ground source storage and dispersion system and the air source cooling and heating integrated unit are connected through pipelines to form an environment end closed loop, and the second circulating working fluid circulates in the environment end closed loop; the energy supply inlet and energy supply outlet of the multi-source cooling and heating integrated unit, the first type of user end, the short-term energy storage device and the working fluid box constitute an energy supply closed loop, and the first circulating working fluid circulates in the energy supply closed loop; the first and second circulating pumps are respectively connected to the server;

[0007] A first valve and a first flow sensor are arranged at a first port of the short-term energy storage device, and the first valve and the first flow sensor are connected to the server respectively;

[0008] A second valve and a second flow sensor are arranged at the outlet of the first type of user end, and the second valve and the second flow sensor are connected to the server respectively;

[0009] A pipeline is connected between the first port of the short-term energy storage device located before the first valve and the outlet of the first type of user end located after the second valve, and a third valve is arranged on the pipeline;

[0010] The ground source storage and dispersion system is buried underground; a third flow sensor is arranged at the entrance of the ground source storage and dispersion system, and the third flow sensor is connected to the server;

[0011] The switches of the air source air conditioning unit and the air source heat pump unit are respectively connected to the server; valves are respectively arranged on the inlet pipes of the air source air conditioning unit and the air source heat pump unit, and the valves are connected to the server.

[0012] The working fluid in multi-source integrated cooling and heating units, air-source integrated cooling and heating units, air-source air-conditioning units and air-source heat pump units is carbon dioxide, which is a green working fluid.

[0013] Temperature sensors are respectively arranged at the energy supply inlet, energy supply outlet, environment end outlet and environment end inlet of the multi-source integrated cooling and heating unit, and connected to the server; the server collects the temperature of the first circulation working fluid of the energy supply inlet, energy supply outlet, environment end outlet and environment end inlet of the multi-source integrated cooling and heating unit through the temperature sensors, and calculates the operating COP of the multi-source integrated cooling and heating unit.

[0014] Temperature sensors are respectively provided at the inlet and outlet of the ground source storage and dispersion system. The temperature sensors are connected to the server and collect the temperature of the ground source storage and dispersion system.

[0015] The first circulating working medium is water, and the second circulating working medium is water or an antifreeze solution consisting of ethylene glycol and water.

[0016] The short-term energy storage device includes an insulating shell and water or a phase change material. The insulating shell contains water or a phase change material. A temperature sensor is provided in the insulating shell, and the temperature sensor is connected to a server. The amount of energy stored in the short-term energy storage device is obtained by the temperature in the short-term energy storage device.

[0017] The ground source storage and dispersion system adopts buried pipes, which are buried underground; the environmental end outlet of the multi-source cooling and heating integrated unit is connected to the inlet of the buried pipe through a pipeline via a second circulation pump, and the outlet of the buried pipe is connected to the inlet of the air source cooling and heating integrated unit through a pipeline; temperature sensors are respectively provided at the inlet and outlet of the buried pipe, and a third flow sensor and a second circulation pump are respectively provided at the inlet of the buried pipe.

[0018] The first type of user end refers to users with relatively large load demands, such as large buildings or areas such as shopping malls, office buildings, and airport terminals; the second type of user end refers to users with relatively small load demands, such as small and medium-sized living buildings or areas such as airport living areas, residential areas, and kindergartens.

[0019] Another object of the present invention is to provide a control method for a centralized intelligently controlled multi-source carbon dioxide cooling and heating integrated system.

[0020] The control method of the centralized intelligently controlled multi-source carbon dioxide cooling and heating integrated system of the present invention comprises the following steps:

[0021] 1. The energy supply closed loop and the environmental end closed loop operate simultaneously to provide energy for the first type of user end:

[0022] 1) Energy supply closed loop:

[0023] The first circulating pump is turned on through the server, and the first circulating working fluid in the working fluid box flows to the multi-source integrated cooling and heating unit; the multi-source integrated cooling and heating unit uses air source and / or ground source energy, and the ground source energy or air source energy heats or cools the first circulating working fluid, and flows to the first type of user end for heating or cooling;

[0024] Areas where the heat load is greater than the cooling load: When providing cooling, the cooling capacity of the ground source is used first. When the server detects that the operating coefficient of performance (COP) of the multi-source cooling and heating unit is less than the rated COP, the cooling capacity of the air source is used in combination; when providing heating, the heat of the air source is used first. When the server detects that the operating COP of the multi-source cooling and heating unit is less than the rated COP, the heat stored in the ground source through the closed loop at the environment end is used in combination;

[0025] Areas with large cooling load and heating load: When providing heating, the heat from the ground source is used first. When the server detects that the operating COP of the multi-source cooling and heating unit is less than the rated COP, the heat from the air source is used in combination; when providing cooling, the cooling from the air source is used first. When the server detects that the operating COP of the multi-source cooling and heating unit is less than the rated COP, the cooling stored in the ground source through the closed loop at the environment end is used in combination;

[0026] When the energy required by the first type of user end is less than the rated power of the multi-source cooling and heating integrated unit, there is excess energy at this time. The first valve is opened through the server, the second valve is opened, and the third valve is closed. At this time, the first port of the short-term energy storage device is used as the inlet, and the second port is used as the outlet. The first circulating working fluid is transmitted from the first port to the short-term energy storage device. At the same time, the server controls the opening of the first valve through the flow feedback from the first flow sensor, and stores the excess energy in the short-term energy storage device; when the energy required by the first type of user end is greater than the rated power of the multi-source cooling and heating integrated unit, the first valve is closed, and at the same time, the server controls the second valve through the flow feedback from the second flow sensor, reduces the opening of the second valve, and opens the third valve. At this time, the first port of the short-term energy storage device is used as the outlet, and the second port is used as the inlet. The energy in the short-term energy storage device flows back to the working fluid box from the first port along with the first circulating working fluid for the next cycle. In the next cycle, the first circulating working fluid enters the air source cooling and heating integrated unit, the air source air conditioning unit or the air source heat pump unit, and the energy stored in the short-term energy storage device is reused;

[0027] 2) Environmental end closed loop:

[0028] The second circulation pump is turned on by the server, and the server controls the power of the second circulation pump through the flow rate fed back by the third flow sensor, and the second circulation working fluid circulates in a closed loop at the environment end; the server controls the power of the second circulation pump according to the difference between the operating COP and the rated COP of the multi-source integrated cooling and heating unit;

[0029] For areas where the heat load is greater than the cooling load: in the cooling season, the multi-source integrated cooling and heating unit generates heat while providing cooling for the first type of user end. The heat is collected by the second circulating working fluid, and the collected heat is transmitted to the ground source storage and dissipation system through the closed loop at the environmental end, and the heat is stored in the ground source; in the heating season, the stored heat is transmitted to the multi-source integrated cooling and heating unit through the closed loop at the environmental end, and the heat is transferred to the first circulating working fluid and provided to the first type of user end for heating; before the cooling season that requires cooling arrives, if the temperature of the ground source storage and dissipation system exceeds the maximum threshold, the air source integrated cooling and heating unit is turned on to cool the second circulating working fluid, and the excess heat stored in the ground source by the ground source storage and dissipation system is taken away through the closed loop at the environmental end to meet the cooling temperature requirements of the cooling season;

[0030] For areas where the cooling load is greater than the heating load: in the heating season, the multi-source integrated cooling and heating unit provides heating for the first type of user end while generating cooling energy, which is collected by the second circulating working fluid, and transmitted to the ground source storage and dispersion system through the closed loop at the environmental end, and stored in the ground source; in the cooling season, the stored cooling energy flows back to the multi-source integrated cooling and heating unit through the closed loop at the environmental end, and is provided to the first type of user end for cooling; before the heating season that requires heating, if the temperature of the ground source storage and dispersion system is lower than the minimum threshold, the air source integrated cooling and heating unit is turned on to heat the second circulating working fluid, and the excess cooling energy stored in the ground source by the ground source storage and dispersion system is taken away through the closed loop at the environmental end, so as to meet the heating temperature requirements of the heating season;

[0031] 2. Providing energy for the second type of user

[0032] When the second type of user terminal needs cooling or heating, the air source air-conditioning unit or the air source heat pump unit is turned on through the server, and the valve arranged on the inlet pipe of the air source air-conditioning unit or the air source heat pump unit is opened through the server, and the first circulating working fluid in the working fluid box flows to the air source air-conditioning unit or the air source heat pump unit, and the air source air-conditioning unit uses the energy in the air source to heat the first circulating working fluid, or the air source heat pump unit uses the energy in the air source to cool the first circulating working fluid, thereby providing cooling or heating for the second type of user terminal.

[0033] Among them, in step 1) of step 1, the server collects the temperatures of the first circulating working fluid at the energy supply inlet, energy supply outlet, environment end outlet and environment end inlet of the multi-source integrated cooling and heating unit through a temperature sensor, and calculates the operating COP of the multi-source integrated cooling and heating unit.

[0034] The server controls the flow of the first circulating working fluid to the short-term energy storage device through the first flow sensor.

[0035] By setting a temperature sensor in the short-term energy storage device, the temperature in the short-term energy storage device is obtained, and further the amount of energy stored in the short-term energy storage device is obtained; and, through the temperature in the short-term energy storage device, the amount of energy stored in the short-term energy storage device that has been used is obtained.

[0036] The server detects the temperature of the first circulating medium at the inlet and outlet of the first type of user terminal through the temperature sensors set at the inlet and outlet of the first type of user terminal, and obtains the energy required by the first type of user terminal; compares it with the rated power of the multi-source cooling and heating integrated unit to determine whether there is excess energy; when the temperature difference of the first circulating medium at the inlet and outlet becomes smaller and is less than the rated temperature difference, it indicates excess energy. For cooling, the rated temperature difference is 5 to 7°C, and for heating, the rated temperature difference is 8 to 10°C.

[0037] When the energy required by the first type of user end is less than the rated power of the multi-source integrated cooling and heating unit, it is necessary to store the excess energy generated by the multi-source integrated cooling and heating unit. At this time, the opening of the second valve is increased. The more excess energy there is, the larger the opening of the second valve is. When the energy required by the first type of user end is greater than the rated power of the multi-source integrated cooling and heating unit, it is necessary to use the energy in the short-term energy storage device. At this time, the opening of the second valve is reduced. The more energy the user requires, the smaller the opening of the second valve is.

[0038] In step 1, 2), the highest threshold for areas where the heat load is greater than the cooling load is 5 to 10°C lower than the local average outdoor temperature during the cooling season; the lowest threshold for areas where the cooling load is greater than the heat load is 5 to 10°C higher than the local average outdoor temperature during the heating season.

[0039] The more the server detects that the operating COP of the multi-source integrated cooling and heating unit is less than the rated COP, the greater the power of the second circulation pump.

[0040] Advantages of the present invention:

[0041] The present invention combines air sources, ground source storage and dispersion systems and short-term energy storage equipment, and comprehensively optimizes and allocates various energy sources through a centralized intelligent control system. It adopts transcritical carbon dioxide cooling and heating integrated technology to recycle multiple energy sources and deliver different total amounts of heat to different demand terminals. The same energy supply closed loop simultaneously provides energy to the first type of user terminals and the second type of user terminals with different load demands to form a segmented energy supply, thereby achieving the operating goals of high efficiency, comfort and low energy consumption. The present invention will provide a green, efficient and economical cooling and heating solution for modern buildings and industrial facilities. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 It is a schematic diagram of an embodiment of the centralized intelligent control multi-source carbon dioxide heating and cooling integrated system of the present invention. DETAILED DESCRIPTION

[0043] The present invention will be further described below through specific embodiments in conjunction with the accompanying drawings.

[0044] like Figure 1 As shown, the centralized intelligent control multi-source carbon dioxide cooling and heating integrated system of this embodiment includes: a multi-source cooling and heating integrated unit, a short-term energy storage device, an air source cooling and heating integrated unit, a ground source storage and dispersion system, an air source air conditioning unit, an air source heat pump unit, a working fluid box and a server; wherein, the outlet of the working fluid box is connected to the energy supply inlet of the multi-source cooling and heating integrated unit through a pipeline, and a first circulation pump is arranged on the pipeline at the outlet of the working fluid box; the energy supply outlet of the multi-source cooling and heating integrated unit is connected to the inlet of the first type of user end and the inlet of the short-term energy storage device through a first tee through a pipeline respectively; the outlet of the first type of user end and the outlet of the short-term energy storage device are connected to the inlet of the working fluid box through a second tee through a pipeline respectively; the environment end outlet of the multi-source cooling and heating integrated unit is connected to the inlet of the ground source storage and dispersion system through a second circulation pump through a pipeline; the outlet of the ground source storage and dispersion system is connected to the inlet of the air source cooling and heating integrated unit through a pipeline; the outlet of the air source cooling and heating integrated unit is connected to the environment end inlet of the multi-source cooling and heating integrated unit through a pipeline; the outlet of the working fluid box is connected to the environment end inlet of the multi-source cooling and heating integrated unit through a pipeline; The pipeline is connected to the energy supply inlet of the air source air conditioning unit, the energy supply outlet of the air source air conditioning unit is connected to the inlet of the second type of user end through the pipeline, and the outlet of the second type of user end is connected to the inlet of the working fluid box; the energy supply outlet of the air source heat pump unit is connected to the inlet of the second type of user end through the pipeline, and the outlet of the second type of user end is connected to the inlet of the working fluid box; the environmental end inlet and environmental outlet of the multi-source integrated cooling and heating unit, the ground source storage and dispersion system and the air source integrated cooling and heating unit are connected through pipelines to form an environmental end closed loop, and the second circulating working fluid circulates in the environmental end closed loop; the energy supply inlet and energy supply outlet of the multi-source integrated cooling and heating unit, the first type of user end, the short-term energy storage device and the working fluid box constitute an energy supply closed loop, and the first circulating working fluid circulates in the energy supply closed loop; the first and second circulating pumps are connected to the server respectively; the first circulating working fluid and the second circulating working fluid are water; the working fluid in the multi-source integrated cooling and heating unit, the air source integrated cooling and heating unit, the air source air conditioning unit and the air source heat pump unit is carbon dioxide, which is a green working fluid;

[0045] Temperature sensors are respectively provided at the energy supply inlet, energy supply outlet, environment end outlet and environment end inlet of the multi-source cooling and heating integrated unit and connected to the server;

[0046] The short-term energy storage device includes a heat-insulating shell and water material, wherein water is contained in the heat-insulating shell; a temperature sensor is arranged in the heat-insulating shell, a first valve and a flow sensor are arranged at the entrance of the short-term energy storage device, and the temperature sensor, the first valve and the first flow sensor are respectively connected to the server;

[0047] A second valve and a second flow sensor are arranged at the outlet of the first type of user end, and the second valve and the second flow sensor are connected to the server respectively;

[0048] A pipeline is connected between the first port of the short-term energy storage device located before the first valve and the outlet of the first type of user end located after the second valve, and a third valve is arranged on the pipeline;

[0049] The ground source storage and dispersion system adopts underground pipes, which are buried underground; the environmental end outlet of the multi-source cooling and heating integrated unit is connected to the inlet of the buried pipe through a second circulation pump via a pipeline, and the outlet of the buried pipe is connected to the inlet of the air source cooling and heating integrated unit through a pipeline; the inlet and outlet of the buried pipe are respectively provided with temperature sensors, and the inlet of the buried pipe is provided with a third flow sensor, and the temperature sensor and the third flow sensor are respectively connected to the server;

[0050] The switches of the air source air conditioning unit and the air source heat pump unit are respectively connected to the server; valves are respectively arranged on the inlet pipes of the air source air conditioning unit and the air source heat pump unit, and the valves are connected to the server.

[0051] The first circulation pump is turned on through the server, and the first circulation working fluid in the working fluid box flows to the multi-source integrated cooling and heating unit; the multi-source integrated cooling and heating unit adopts air source and / or ground source energy. The ground source is used to cope with extreme weather conditions as a supplement to the air source. When the air source cannot meet the demand, the ground source energy or air source energy heats or cools the first circulation working fluid and flows to the first type of user end for heating or cooling; areas where the heat load is greater than the cold load: when providing cooling, the ground source temperature is lower than that of the air, and the ground source energy is used first. The server controls the multi-source integrated cooling and heating unit to exchange energy for cooling with the air source. When the operating performance of the multi-source integrated cooling and heating unit is detected by the server, the ground source energy is used to cool the first circulation working fluid. When the coefficient of energy consumption (COP) is less than the rated COP, the server controls the multi-source cooling and heating integrated unit to exchange energy with the air source for cooling, and controls the multi-source cooling and heating integrated unit to exchange energy with the ground source for cooling. The server turns on the second circulation pump, and the second circulation working medium flows in the multi-source cooling and heating integrated unit to cool the first circulation working medium. When providing heating, the heat of the air source is used first, and the server controls the multi-source cooling and heating integrated unit to exchange energy with the air source for heating. When the server detects that the operating COP of the multi-source cooling and heating integrated unit is less than the rated COP, the server controls the multi-source cooling and heating integrated unit to exchange energy with the air source for heating. The multi-source cooling and heating integrated unit exchanges energy with the air source for heating while controlling the multi-source cooling and heating integrated unit to exchange heat stored in the ground source with the closed loop at the environment end for heating. The server turns on the second circulation pump to allow the second circulation working medium to pass through the multi-source cooling and heating integrated unit, and cool the first circulation working medium through the multi-source cooling and heating integrated unit; for areas with large cooling load and heating load, when providing heating, the heat of the ground source is used first. When the server detects that the operating COP of the multi-source cooling and heating integrated unit is less than the rated COP, the heat of the air source is used in combination; when providing cooling, the cooling capacity of the air source is used first. When the server detects that the operating COP of the multi-source cooling and heating integrated unit is less than the rated COP, the heat of the air source is used in combination. When the COP is reached, the server controls the multi-source cooling and heating integrated unit to exchange energy with the air source for cooling, and controls the multi-source cooling and heating integrated unit to exchange cooling with the cooling amount stored in the ground source in the closed loop of the environment end. The server turns on the second circulation pump to make the second circulation medium pass through the multi-source cooling and heating integrated unit, and heat the first circulation medium through the multi-source cooling and heating integrated unit. When the energy required by the first type of user end is less than the rated power of the multi-source cooling and heating integrated unit, the energy is in excess at this time. The server opens the first valve, and the first circulation medium is transmitted to the short-term energy storage device to store the excess energy in the short-term energy storage device.In extreme weather conditions, or during a day's energy consumption peak (for example, when all users get off work at night, there will be a peak in energy consumption), when it is detected that the temperature difference between the inlet and outlet water at the user end is too large and greater than a certain temperature threshold, for cooling, this temperature is 5-7°C, for heating, this temperature is 8-10°C, indicating that the energy required by the user is greater than the rated power of the multi-source integrated cooling and heating unit. At this time, the energy in the short-term energy storage device is used to flow back to the working fluid box along with the first cycle working fluid for the next cycle. In the next cycle, the first cycle working fluid enters the air source integrated cooling and heating unit, air source air conditioning unit or air source heat pump unit, and the energy in the short-term energy storage device is reused;

[0052] The second circulation pump is turned on by the server, and at the same time, the server controls the power of the second circulation pump through the flow feedback from the third flow sensor, and the second circulation working fluid circulates in the closed loop at the environmental end; the server controls the power of the second circulation pump according to the difference between the operating COP and the rated COP of the multi-source integrated cooling and heating unit; for areas where the heat load is greater than the cooling load: in the cooling season, the multi-source integrated cooling and heating unit generates heat while providing cooling for the first type of user end, and the heat is collected by the second circulation working fluid, and the collected heat is transmitted to the ground source storage and dissipation system through the closed loop at the environmental end, and the heat is stored in the ground source; in the heating season, the stored heat is transmitted to the multi-source integrated cooling and heating unit through the closed loop at the environmental end, and the heat is transferred to the first circulation working fluid and provided to the first type of user end for heating; before the cooling season when cooling is required, if the temperature of the ground source storage and dissipation system exceeds the maximum threshold, the air source cooling and heating is turned on. The integrated unit cools down the second circulation working fluid, and takes away the excess heat stored in the ground source by the ground source storage and dispersion system through the closed loop at the environmental end, so as to meet the cooling temperature requirements in the cooling season; for areas where the cooling load is greater than the heating load: in the heating season, the multi-source integrated cooling and heating unit generates cooling energy while providing heating for the first type of user end. The cooling energy is collected by the second circulation working fluid, and the collected cooling energy is transmitted to the ground source storage and dispersion system through the closed loop at the environmental end, and the cooling energy is stored in the ground source; in the cooling season, the stored cooling energy flows back to the multi-source integrated cooling and heating unit through the closed loop at the environmental end, and is provided to the first type of user end for cooling; before the heating season when heating is required, if the temperature of the ground source storage and dispersion system is lower than the minimum threshold, the air source integrated cooling and heating unit is turned on to heat the second circulation working fluid, and the excess cooling energy stored in the ground source by the ground source storage and dispersion system is taken away through the closed loop at the environmental end, so as to meet the heating temperature requirements in the heating season;

[0053] When the second type of user terminal needs cooling or heating, the air source air-conditioning unit or the air source heat pump unit is turned on through the server, and the valve arranged on the inlet pipe of the air source air-conditioning unit or the air source heat pump unit is opened through the server, and the first circulating working fluid in the working fluid box flows to the air source air-conditioning unit or the air source heat pump unit, and the air source air-conditioning unit uses the energy in the air source to heat the first circulating working fluid, or the air source heat pump unit uses the energy in the air source to cool the first circulating working fluid, thereby providing cooling or heating for the second type of user terminal.

[0054] Finally, it should be noted that the purpose of publishing the embodiments is to help further understand the present invention, but those skilled in the art can understand that various substitutions and modifications are possible without departing from the spirit and scope of the present invention and the appended claims. Therefore, the present invention should not be limited to the contents disclosed in the embodiments, and the scope of protection claimed by the present invention shall be subject to the scope defined in the claims.

Claims

1. A centralized intelligently controlled multi-source carbon dioxide cooling and heating integrated system, characterized in that: The multi-source carbon dioxide cooling and heating integrated system comprises: a multi-source cooling and heating integrated unit, a short-term energy storage device, an air source cooling and heating integrated unit, a ground source storage and dispersion system, an air source air conditioning unit, an air source heat pump unit, a working fluid box and a server; wherein a first circulating pump is arranged on the pipeline at the outlet of the working fluid box, and the outlet of the working fluid box is connected to the energy supply inlet of the multi-source cooling and heating integrated unit through a pipeline; the energy supply outlet of the multi-source cooling and heating integrated unit is respectively connected to the inlet of the first type of user end and the first port of the short-term energy storage device through pipelines; the outlet of the first type of user end and the second port of the short-term energy storage device are respectively connected to the inlet of the working fluid box through pipelines; the environment end outlet of the multi-source cooling and heating integrated unit is connected to the inlet of the ground source storage and dispersion system through a second circulating pump via a pipeline; the outlet of the ground source storage and dispersion system is connected to the inlet of the air source cooling and heating integrated unit through a pipeline; the outlet of the air source cooling and heating integrated unit is connected to the environment end outlet of the multi-source cooling and heating integrated unit through a pipeline The outlet of the working fluid box is connected to the energy supply inlet of the air source air-conditioning unit through a pipeline, the energy supply outlet of the air source air-conditioning unit is connected to the inlet of the second type of user end through a pipeline, and the outlet of the second type of user end is connected to the inlet of the working fluid box; the outlet of the working fluid box is connected to the energy supply inlet of the air source heat pump unit through a pipeline, the energy supply outlet of the air source heat pump unit is connected to the inlet of the second type of user end through a pipeline, and the outlet of the second type of user end is connected to the inlet of the working fluid box; the environmental end inlet and environmental outlet of the multi-source cooling and heating integrated unit, the ground source storage and dispersion system and the air source cooling and heating integrated unit are connected through pipelines to form an environmental end closed loop, and the second circulating working fluid circulates in the environmental end closed loop; the energy supply inlet and energy supply outlet of the multi-source cooling and heating integrated unit, the first type of user end, the short-term energy storage device and the working fluid box form an energy supply closed loop, and the first circulating working fluid circulates in the energy supply closed loop; the first and second circulating pumps are respectively connected to the server; A first valve and a first flow sensor are arranged at a first port of the short-term energy storage device, and the first valve and the first flow sensor are connected to the server respectively; A second valve and a second flow sensor are arranged at the outlet of the first type of user end, and the second valve and the second flow sensor are connected to the server respectively; A pipeline is connected between the first port of the short-term energy storage device located before the first valve and the outlet of the first type of user end located after the second valve, and a third valve is arranged on the pipeline; The ground source storage and dispersion system is buried underground; a third flow sensor is arranged at the entrance of the ground source storage and dispersion system, and the third flow sensor is connected to the server; The switches of the air source air conditioning unit and the air source heat pump unit are respectively connected to the server; valves are respectively arranged on the inlet pipes of the air source air conditioning unit and the air source heat pump unit, and the valves are connected to the server.

2. The multi-source carbon dioxide cooling and heating integrated system according to claim 1, characterized in that: The working fluid in the multi-source integrated cooling and heating unit, the air-source integrated cooling and heating unit, the air-source air-conditioning unit and the air-source heat pump unit is carbon dioxide.

3. The multi-source carbon dioxide cooling and heating integrated system according to claim 1, characterized in that: The short-term energy storage device includes a heat-insulating shell and water or a phase-change material. The heat-insulating shell contains water or the phase-change material. A temperature sensor is arranged in the heat-insulating shell, and the temperature sensor is connected to the server.

4. The multi-source carbon dioxide cooling and heating integrated system according to claim 1, characterized in that: The ground source storage and dispersion system adopts buried pipes, which are buried underground; the environmental end outlet of the multi-source cooling and heating integrated unit is connected to the inlet of the buried pipe through a pipeline via a second circulation pump, and the outlet of the buried pipe is connected to the inlet of the air source cooling and heating integrated unit through a pipeline; the inlet and outlet of the buried pipe are respectively provided with temperature sensors, and the inlet of the buried pipe is respectively provided with a third flow sensor and a second circulation pump.

5. A control method for a centralized intelligently controlled multi-source carbon dioxide cooling and heating integrated system as claimed in claim 1, characterized in that: The control method comprises the following steps:

1. The energy supply closed loop and the environmental end closed loop operate simultaneously to provide energy for the first type of user end: 1) Energy supply closed loop: The first circulating pump is turned on through the server, and the first circulating working fluid in the working fluid box flows to the multi-source integrated cooling and heating unit; the multi-source integrated cooling and heating unit uses air source and / or ground source energy, and the ground source energy or air source energy heats or cools the first circulating working fluid, and flows to the first type of user end for heating or cooling; Areas where the heat load is greater than the cooling load: When providing cooling, priority is given to using the cooling capacity of the ground source. When the server detects that the operating coefficient of performance (COP) of the multi-source cooling and heating integrated unit is less than the rated COP, the cooling capacity of the air source is used in combination. When providing heating, priority is given to using the heat of the air source. When the server detects that the operating COP of the multi-source cooling and heating integrated unit is less than the rated COP, the heat stored in the ground source through the closed loop at the environment end is used in combination. Areas with large cooling load and heating load: When providing heating, the heat from the ground source is used first. When the server detects that the operating COP of the multi-source cooling and heating unit is less than the rated COP, the heat from the air source is used in combination; when providing cooling, the cooling from the air source is used first. When the server detects that the operating COP of the multi-source cooling and heating unit is less than the rated COP, the cooling stored in the ground source through the closed loop at the environment end is used in combination; When the energy required by the first type of user end is less than the rated power of the multi-source cooling and heating integrated unit, there is excess energy at this time. The first valve is opened through the server, the second valve is opened, and the third valve is closed. At this time, the first port of the short-term energy storage device is used as the inlet, and the second port is used as the outlet. The first circulating working fluid is transmitted from the first port to the short-term energy storage device. At the same time, the server controls the opening of the first valve through the flow feedback from the first flow sensor, and stores the excess energy in the short-term energy storage device; when the energy required by the first type of user end is greater than the rated power of the multi-source cooling and heating integrated unit, the first valve is closed, and at the same time, the server controls the second valve through the flow feedback from the second flow sensor, reduces the opening of the second valve, and opens the third valve. At this time, the first port of the short-term energy storage device is used as the outlet, and the second port is used as the inlet. The energy in the short-term energy storage device flows back to the working fluid box from the first port along with the first circulating working fluid for the next cycle. In the next cycle, the first circulating working fluid enters the air source cooling and heating integrated unit, the air source air conditioning unit or the air source heat pump unit, and the energy stored in the short-term energy storage device is reused; 2) Environmental end closed loop: The second circulation pump is turned on by the server, and the server controls the power of the second circulation pump through the flow rate fed back by the third flow sensor, and the second circulation working fluid circulates in a closed loop at the environment end; the server controls the power of the second circulation pump according to the difference between the operating COP and the rated COP of the multi-source integrated cooling and heating unit; For areas where the heat load is greater than the cooling load: in the cooling season, the multi-source integrated cooling and heating unit generates heat while providing cooling for the first type of user end. The heat is collected by the second circulating working fluid, and the collected heat is transmitted to the ground source storage and dissipation system through the closed loop at the environmental end, and the heat is stored in the ground source; in the heating season, the stored heat is transmitted to the multi-source integrated cooling and heating unit through the closed loop at the environmental end, and the heat is transferred to the first circulating working fluid and provided to the first type of user end for heating; before the cooling season that requires cooling arrives, if the temperature of the ground source storage and dissipation system exceeds the maximum threshold, the air source integrated cooling and heating unit is turned on to cool the second circulating working fluid, and the excess heat stored in the ground source by the ground source storage and dissipation system is taken away through the closed loop at the environmental end to meet the cooling temperature requirements of the cooling season; For areas where the cooling load is greater than the heating load: in the heating season, the multi-source integrated cooling and heating unit provides heating for the first type of user end while generating cooling energy, which is collected by the second circulating working fluid, and transmitted to the ground source storage and dispersion system through the closed loop at the environmental end, and stored in the ground source; in the cooling season, the stored cooling energy flows back to the multi-source integrated cooling and heating unit through the closed loop at the environmental end, and is provided to the first type of user end for cooling; before the heating season that requires heating, if the temperature of the ground source storage and dispersion system is lower than the minimum threshold, the air source integrated cooling and heating unit is turned on to heat the second circulating working fluid, and the excess cooling energy stored in the ground source by the ground source storage and dispersion system is taken away through the closed loop at the environmental end, so as to meet the heating temperature requirements of the heating season; 2. Providing energy for the second type of user When the second type of user terminal needs cooling or heating, the air source air-conditioning unit or the air source heat pump unit is turned on through the server, and the valve arranged on the inlet pipe of the air source air-conditioning unit or the air source heat pump unit is opened through the server, and the first circulating working fluid in the working fluid box flows to the air source air-conditioning unit or the air source heat pump unit, and the air source air-conditioning unit uses the energy in the air source to heat the first circulating working fluid, or the air source heat pump unit uses the energy in the air source to cool the first circulating working fluid, thereby providing cooling or heating for the second type of user terminal.

6. The control method according to claim 5, characterized in that: In step 1) of step 1, the server collects the temperatures of the first circulating working fluid at the energy supply inlet, energy supply outlet, environment end outlet and environment end inlet of the multi-source integrated cooling and heating unit through temperature sensors, and calculates the operating COP of the multi-source integrated cooling and heating unit.

7. The control method according to claim 5, characterized in that: In step 1) of step one, the server controls the flow of the first circulating working fluid to the short-term energy storage device through a first flow sensor.

8. The control method according to claim 5, characterized in that: In step 1) , the server detects the temperature of the first circulating working fluid at the inlet and outlet of the first type of user terminal through temperature sensors set at the inlet and outlet of the first type of user terminal; when the temperature difference of the first circulating working fluid at the inlet and outlet becomes smaller and is less than the rated temperature difference, it indicates excess energy.

9. The control method according to claim 8, characterized in that: For cooling, the rated temperature difference is 5~7℃, and for heating, the rated temperature difference is 8~10℃.

10. The control method according to claim 5, characterized in that: In step 1, 2), the highest threshold for areas where the heat load is greater than the cooling load is 5~10℃ lower than the local average outdoor temperature in the cooling season; the lowest threshold for areas where the cooling load is greater than the heat load is 5~10℃ higher than the local average outdoor temperature in the heating season.

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