Distributed heat supply and cold recovery system

Abstract

The application discloses a distributed heat supply and cold recovery system, comprising a plurality of heat pumps, a plurality of heat demand points, a plurality of cold demand points and a heat supply system and a cold supply system, wherein: each group of heat demand points is composed of one or more heat demand points, the heat supply system is provided with a plurality of heat supply systems, the number of the heat supply systems is consistent with the number of groups of the heat demand points, and the plurality of heat supply systems are arranged in a one-to-one correspondence at the plurality of groups of heat demand points in a scattered manner to supply heat for the heat demand points, and each heat supply system can independently adjust the heat supply temperature according to the temperature requirement of the corresponding heat demand point; the cold supply system is connected with the plurality of cold demand points at the same time to supply cold for the plurality of cold demand points.

Description

Technical Field

[0001] This invention relates to the field of energy-saving technology for factories, and more particularly to the field of energy-saving technology for factories that have both cooling and heating needs and that have more than one heating need point, especially to the field of energy-saving technology for painting factories for automobile bodies or parts. Background Technology

[0002] Factories, especially automotive body or parts painting plants, typically have multiple cooling and heating demand points, distributed across multiple floors and areas within the factory. The common method for supplying cooling capacity is to construct a refrigeration station, where multiple refrigeration units are centrally located. Chilled water (or other refrigerants, such as ethylene glycol solution) is delivered to each cooling demand point via circulating pumps and supply pipes. At these points, the cooling capacity is transferred through heat exchange equipment, increasing the chilled water temperature. The chilled water then returns to the refrigeration station via return pipes, where it is cooled before being sent back to the supply pipes, thus completing the cycle. The refrigeration system can automatically adjust the number of refrigeration units and their cooling capacity based on changes in the cooling load. The currently common method for supplying heat is as follows: high-temperature hot water is generated in a boiler room or heat exchange station, and then delivered to various heat demand points via hot water circulation pumps and hot water supply pipes. At these points, heat is transferred out through heat exchange equipment, the hot water temperature decreases, and it returns to the boiler room or heat exchange station via return pipes. There, it is reheated and then sent back to the hot water circulation pump, thus completing the cycle. It is worth noting that cooling demand points consume the cooling capacity of chilled water, not directly consume chilled water, while heating demand points consume the heat capacity of hot water, not directly consume hot water.

[0003] In the existing heat supply scheme, heat originates from a single point and is distributed to various heat demand points within the factory via hot water pipes. This results in the following:

[0004] Hot water supply temperature is fixed. When multiple heat demand points require different supply temperatures, the supply temperature cannot be adjusted directly. Other methods are required, such as using two-stage heat exchange equipment or mixing water heat exchange. When multiple heat demand points require inconsistent supply temperatures, the factory hot water supply temperature must be supplied according to the highest temperature.

[0005] Hot water flows from the outlet of the hot water circulation pump through the pipeline network to each heat demand point. After heat exchange and cooling, it returns to the boiler or heat exchange station. The hot water travels a long distance, and the friction loss and heat loss along the way are both relatively large.

[0006] The power for hot water flow comes from a hot water circulation pump. When only one (or a few) heat demand points are operating, the required hot water flow is small, and the hot water circulation pump needs to operate at a reduced frequency. When the frequency is reduced to the lower limit, if the pump flow rate is still greater than the flow rate required by the heat demand point, the bypass valve between the supply and return pipes needs to be opened. The rated flow rate of the hot water circulation pump is determined by the total hot water demand of the factory. A large rated power means that the flow rate of a single hot water circulation pump is much greater than the flow rate required by a single heat demand point. When using a hot water circulation pump to supply heat to a single heat demand point, the operating power of the hot water circulation pump is high, and the energy waste caused by the bypass flow is significant.

[0007] While producing cooling capacity, refrigeration units generate more heat, which is then discharged into the environment through cooling towers, resulting in energy waste and thermal pollution. Summary of the Invention

[0008] This invention provides a distributed heat supply and cold energy recovery system to solve this problem.

[0009] To achieve the above objectives, this application provides the following technical solution:

[0010] A distributed heat supply and cooling recovery system includes multiple heat pumps, multiple heat demand points, multiple cooling demand points, a heat supply system, and a cooling supply system, wherein:

[0011] Each group of heat demand points consists of one or more heat demand points. The heat supply system is provided in multiple ways, with the number of heat supply systems being the same as the number of groups of heat demand points. The multiple heat supply systems are distributed and arranged one-to-one at the multiple groups of heat demand points to supply heat to the heat demand points. Each heat supply system can independently adjust the heat supply temperature according to the temperature requirements of the corresponding heat demand point.

[0012] The cooling supply system is connected to multiple cooling demand points simultaneously, providing cooling supply to these multiple cooling demand points.

[0013] The system is further configured such that: the heat supply system includes a first water pump, a hot water tank, and a condenser of the heat pump; a hot water pipe is provided between the hot water tank and the condenser; the first water pump is installed on the hot water pipe; the condenser is connected to the heat demand point; the first water pump is used to drive the hot water circulation, ensuring that the hot water flows from the hot water tank to the condenser and is further delivered to the heat demand point; after releasing heat and cooling down, the hot water flows back to the hot water tank; and the condenser is used to heat the hot water drawn from the hot water tank by the first water pump to supply heat to the heat demand point.

[0014] The system is further configured such that: the cooling supply system includes a refrigeration unit and a second water pump; chilled water supply pipes are provided between the refrigeration unit and each of the multiple cooling demand points; the chilled water supply pipes are used to transport the cooling capacity generated by the refrigeration unit to each cooling demand point via chilled water; chilled water return pipes are also provided between the multiple cooling demand points and the refrigeration unit; and the multiple chilled water return pipes merge into a single chilled water main pipe; the second water pump is installed on the chilled water main pipe; and the second water pump is used to drive the chilled water to circulate in the pipe to ensure a continuous supply of cooling capacity.

[0015] Further configuration includes a cold energy recovery system, which includes an evaporator of a heat pump. A first branch pipe and a second branch pipe are provided between the evaporator and the chilled water return pipe. The chilled water exchanges heat through the evaporator, recovers the cold energy of the evaporator, and then its temperature decreases. It then flows back to the cold energy supply system through the second branch pipe, realizing the recovery and recycling of cold energy to reduce the load and energy consumption of the refrigeration unit.

[0016] Further configuration includes: a heat replenishment device connected to the hot water tank.

[0017] The device is further configured such that the heating device can be directly connected to the hot water tank or connected through a pipe. When the heating device is connected to the hot water tank through a pipe, a heating circulation pump is installed on the pipe.

[0018] The system is further configured to include a control system and a first temperature sensor and a second temperature sensor that are electrically or signal-connected to the control system. The control system controls the start-up and shutdown of the refrigeration unit and the reheating equipment through the monitoring data of the first temperature sensor and the second temperature sensor.

[0019] The device is further configured such that: the first temperature sensor is installed on the chilled water return pipe to monitor the temperature of the chilled water return in real time; and the second temperature sensor is installed on the hot water tank and / or the hot water pipe to monitor the temperature of the hot water in real time.

[0020] The system is further configured such that when the return water temperature measured by the first temperature sensor is lower than the set value, the control system shuts down the refrigeration unit to reduce the amount of cooling generated. After the refrigeration unit is shut down, when the hot water temperature measured by the second temperature sensor is lower than the set value, the control system activates the heat replenishment equipment to ensure that there is enough heat available for the heat demand points.

[0021] The system is further configured such that when the hot water temperature measured by the second temperature sensor is higher than the set value, the control system shuts down the supplementary heating equipment to reduce the generation of heat and prevent the hot water temperature from becoming too high. After the supplementary heating equipment is shut down, when the chilled water temperature measured by the first temperature sensor is higher than the set value, the control system turns on the refrigeration unit to ensure that there is enough cooling capacity to be provided to the cooling demand point.

[0022] Compared with the prior art, the beneficial technical effects of the present invention are as follows:

[0023] 1. Since the heat supply system is distributed and each heat supply system is independent of the others, hot water at the required temperature can be provided to each heat demand point or each group of heat demand points without the need to use secondary heat exchange equipment, mixed flow heat exchange, or other methods to adjust the hot water supply temperature for the heat demand points.

[0024] 2. Since the heat supply system is distributed and located near the heat demand point, the distance that the hot water flows through is short, and the friction loss and heat loss are relatively small.

[0025] 3. The scale of the hot water pipe network is reduced. The rated flow and rated power of the hot water circulation pump are no longer selected according to the maximum total heat demand of the entire factory. When only one or a few heat demand points are working, only the corresponding heat supply system can be turned on. Compared with turning on the hot water pump to provide heat for the entire factory, the pump has a smaller operating power, less bypass flow loss, and less energy waste.

[0026] 4. While providing heat, the heat pump also generates cooling. This cooling can lower the return water temperature of the chilled water, thereby reducing the operating power of the chiller unit and reducing the heat discharged into the environment through the cooling tower, thus reducing energy waste and thermal pollution. Attached Figure Description

[0027] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0029] Attached diagram labels: C, Cooling demand point; H, Heating demand point; 11, Heat pump; 111, Evaporator; 112, Condenser; 12, Booster pump; 13, First water pump; 14, Hot water tank; 15, Heat replenishment equipment; 16, Hot water pipe; 901, Chiller unit; 902, Second water pump; 903, Chilled water supply pipe; 904, Chilled water return pipe; 905, First branch pipe; 906, Second branch pipe; 21, Heat replenishment pipe; 26, Heat replenishment circulation pump. Detailed Implementation

[0030] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] In the description of this invention, it should be noted that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0032] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0033] Reference Figure 1 The distributed heat supply and cold energy recovery system disclosed in this invention includes multiple sets of heat demand points H that are spatially discrete. Each set of heat demand points H consists of one or more heat demand points H. A corresponding heat supply system is set at each set of heat demand points H, and the multiple heat supply systems are distributed in a one-to-one correspondence at each set of heat demand points H to supply heat to the heat demand points H.

[0034] Specifically, the number of multiple heat supply systems is consistent with the number of multiple heat demand points H, and each heat supply system can independently adjust the heat supply temperature according to the temperature requirements of the corresponding heat demand point H, so as to ensure that the heat supply system supplies hot water at the corresponding temperature required by each heat demand point H. Moreover, the heat supply system and the heat demand point H it serves are spatially close, which shortens the distance of hot water flow and reduces the resistance loss and heat dissipation loss of hot water along the way.

[0035] In this embodiment, a cooling supply system, a cooling recovery system, and multiple cooling demand points C are also included. The cooling supply system is connected to the multiple cooling demand points C and provides cooling to the multiple cooling demand points C. The cooling recovery system is connected to the cooling supply system and can recover the cooling energy dissipated by the heating system during the heating process to the cooling supply system, so as to realize the recovery and recycling of cooling energy and reduce the load and energy consumption of the cooling supply system.

[0036] Specifically, the heat supply system consists of a condenser 112 of the heat pump 11, a first water pump 13, and a hot water tank 14. A hot water pipe 16 is provided between the hot water tank 14 and the condenser 112. The first water pump 13 is installed on the hot water pipe 16. The condenser 112 is connected to the heat demand point H. The first water pump 13 is used to drive the hot water circulation, ensuring that the hot water flows from the hot water tank 14 to the condenser 112 and is further transported to the heat demand point H. After releasing heat and cooling down, the hot water flows back to the hot water tank 14. The condenser 112 is used to heat the hot water drawn from the hot water tank 14 by the first water pump 13 to provide heat for the heat demand point H.

[0037] The cooling supply system includes a refrigeration unit and a second water pump 902. A chilled water supply pipeline 903 is provided between the refrigeration unit and the multiple cooling demand points C. The chilled water supply pipeline 903 is used to transport the cooling generated by the refrigeration unit to each cooling demand point C through chilled water. A chilled water return pipeline 904 is also provided between the multiple cooling demand points C and the refrigeration unit, and the multiple chilled water return pipelines 904 merge into a single chilled water main. The second water pump 902 is installed on the chilled water main and is used to drive the chilled water to circulate in the pipeline to ensure a continuous supply of cooling capacity.

[0038] The cold energy recovery system includes an evaporator 111 of a heat pump 11. A first branch pipe 905 and a second branch pipe 906 are provided between the evaporator 111 and the chilled water return pipe 904. A booster pump 12 is provided on the first branch pipe 905. The booster pump 12 is used to introduce chilled water from the chilled water return pipe 904 into the evaporator 111. The chilled water exchanges heat through the evaporator 111, and its temperature decreases after recovering the cold energy of the evaporator 111. It then flows back to the cold energy supply system through the second branch pipe 906 to realize the recovery and recycling of cold energy, thereby reducing the load and energy consumption of the refrigeration unit.

[0039] In another embodiment, no booster pump 12 is provided. To ensure that there is enough water to enter the evaporator 111 of the heat pump 11, a valve is provided on the chilled water return pipe 904 between the first branch pipe 905 and the second branch pipe 906. By closing the valve, water is forced to enter the first branch pipe 905 and flow through the evaporator 111.

[0040] This invention also includes a heat replenishment device 15 connected to the hot water tank 14. The heat replenishment device 15 is one or more of an air source heat pump 11, a solar collector, and an electric heater. The heat replenishment device 15 can be directly connected to the hot water tank 14 or connected through a heat replenishment pipe 21. When the heat replenishment device 15 and the hot water tank 14 are connected through the heat replenishment pipe 21, a heat replenishment circulation pump 26 is installed on the heat replenishment pipe 21. The heat replenishment circulation pump 26 is connected to the hot water tank 14 and the heat replenishment device 15 through the heat replenishment pipe 21, forming a loop. The heat replenishment circulation pump 26 draws water from the hot water tank 14 and pumps it to the heat replenishment device 15. After the water absorbs heat from the heat replenishment device 15 and its temperature rises, it flows back to the hot water tank 14.

[0041] In this invention, the heat pump 11 has two operating modes: a cooling control mode and a heating control mode. The cooling control mode uses the cooling capacity QC generated by the evaporator 111 as the control target. In this mode, the heating capacity QH generated by the condenser 112 is a byproduct, passively changing with QC and uncontrolled. The heating control mode uses the heating capacity QH generated by the condenser 112 as the control target. In this mode, the cooling capacity QC generated by the evaporator 111 is a byproduct, passively changing with QH and uncontrolled. Regardless of the operating mode, the changes in QC and QH are consistent; that is, if QC increases, QH will increase accordingly, and vice versa.

[0042] As the seasons or environmental conditions change, the demand for cooling will fluctuate. When the demand for cooling is high, the chilled water flow is large, and there is sufficient chilled water return water as a heat source to provide heat to the heat pump 11. When the demand for cooling is low, the demand for cooling may be less than the cooling capacity QC generated by the evaporator 111 when the heat pump 11 is heating. The temperature of the chilled water return water will continue to decrease. At this time, the chiller unit should be shut down, and the working mode of the heat pump 11 should be switched from the heating control mode to the cooling control mode to match the cooling capacity QC with the demand for cooling. The supplementary heating equipment 15 should be turned on in a timely manner to ensure that there is enough heat to be provided to the heat demand point H. When the demand for cooling increases, QC increases, and QH will also increase. If QH is greater than the heat demand, the hot water temperature will continue to rise. At this time, the supplementary heating equipment 15 should be shut down, and the working mode of the heat pump 11 should be switched from the cooling control mode to the heating control mode to match the heating capacity QH with the heat demand. The chiller unit should be turned on in a timely manner to ensure that there is enough cooling capacity to be provided to the cooling demand point C.

[0043] Therefore, this invention also includes a control system and a first temperature sensor and a second temperature sensor electrically or signal-connected to the control system. The control system controls the opening and closing of the refrigeration unit and the supplementary heating device 15 through the monitoring data of the first temperature sensor and the second temperature sensor. Specifically, the first temperature sensor is installed on the chilled water return pipe 904 to monitor the temperature of the chilled water return in real time. When the return water temperature is lower than the set value, the control system shuts down the refrigeration unit to reduce the generation of cooling capacity. After the refrigeration unit is shut down, when the hot water temperature measured by the second temperature sensor is lower than the set value, the control system turns on the supplementary heating device 15 to ensure that there is enough heat to be provided to the heat demand point H. The second sensor is installed on the hot water tank 14 and / or the hot water pipe 16 to monitor the temperature of the hot water in real time. When the hot water temperature is higher than the set value, the control system shuts down the supplementary heating device 15 to reduce the generation of heating capacity and prevent the hot water temperature from being too high. After the supplementary heating device 15 is shut down, when the chilled water temperature measured by the first temperature sensor is higher than the set value, the control system turns on the refrigeration unit to ensure that there is enough cooling capacity to be provided to the cooling demand point C.

[0044] The working principle and beneficial effects of this invention are as follows:

[0045] This invention sets up a heat supply system near each heat demand point H or in each relatively concentrated group of heat demand points H. The evaporator 111 of the heat pump 11 absorbs heat from the chilled water return and transfers the heat to the hot water in the condenser 112. The hot water flows to the heat demand point H through the hot water pump and hot water pipe 16, providing heat to the heat demand point H. The temperature of the chilled water return decreases after flowing through the evaporator 111 of the heat pump 11, thereby reducing the operating power and / or installed power of the refrigeration unit. At this time, the heat pump 11 operates in heating control mode, and all the heat for the heat demand point H is provided by the heat pump 11, and the supplementary heating equipment 15 is not activated.

[0046] As the seasons or environmental conditions change, when the cooling demand is high, the chilled water flow is large, and there is sufficient chilled water return water as a heat source to provide heat to the heat pump 11. When the cooling demand is low, the cooling demand may be less than the cooling capacity QC generated by the evaporator 111 when the heat pump 11 is heating. If no measures are taken, this will cause the chilled water return water temperature to continue to drop. This phenomenon will be detected by the first temperature sensor installed on the chilled water return water pipe 904. Therefore, a response can be taken to solve this problem when the first temperature sensor detects that the chilled water return water temperature is continuously dropping. The specific process is to shut down the refrigeration unit and switch the working mode of the heat pump 11 from the heating control mode to the cooling control mode, so that the cooling capacity QC matches the cooling demand. As mentioned above, the heating capacity QH generated by the condenser 112 is uncontrollable at this time. Therefore, it is necessary to turn on the supplementary heating equipment 15 in a timely manner to ensure that there is enough heat to be provided to the heat demand point H.

[0047] When the cooling demand increases, QC increases, and QH also increases. If QH exceeds the heating demand, the hot water temperature will continue to rise. This phenomenon will be detected by the second temperature sensor installed on the hot water pipe 16 or the hot water tank 14. Therefore, a response can be taken to solve this problem when the second temperature sensor detects a continuous rise in the hot water temperature. The specific process is as follows: the supplementary heating device 15 is turned off, and the operating mode of the heat pump 11 is switched from cooling control mode to heating control mode, so that the heating capacity QH matches the heating demand. As mentioned above, the cooling capacity QC generated by the evaporator 111 is uncontrollable at this time. Therefore, it is necessary to turn on the refrigeration unit in a timely manner to ensure that there is enough cooling capacity to be provided to the cooling demand point C.

[0048] This invention eliminates the need for a factory-wide hot water network, directly providing the required heating temperature to each hot spot. Simultaneously, it recovers the cooling energy generated during equipment operation, reducing the operating power and installed capacity of the refrigeration system. In this process, the invention reduces the scale of the hot water network, no longer selecting the rated flow and power of the hot water circulation pump based on the factory's maximum total heat consumption. Instead, it selects the rated flow and power of the corresponding hot water circulation pump based on the heat consumption of each (or a group of relatively concentrated) hot spot. This reduces the rated flow and power of the hot water pump. When only one or a few hot spots are operating, the required hot water flow is minimal, allowing the corresponding hot water circulation pump to be activated. Compared to traditional solutions that adapt to the entire factory's hot water system, the operating flow and power of the hot water circulation pump are significantly reduced, as is the bypass flow, thus lowering the energy consumption of the hot water circulation system.

[0049] Furthermore, this invention shortens the distance between the hot water generator and the point of use, reduces the distance the hot water flows, and decreases friction loss and heat dissipation loss. This invention also proposes a heat allocation method for situations with unbalanced heating and cooling loads. By adjusting the operating power of the heat pump and appropriately activating the refrigeration unit and supplementary heating equipment, the system can still provide cooling and heating capacity matching the load when the heating and cooling loads change due to seasonal variations, while ensuring the reliability of system operation.

[0050] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A distributed heat supply and cold energy recovery system, characterized in that, The system includes multiple heat pumps (11), multiple sets of heat demand points (H), multiple sets of cooling demand points (C), and heat supply systems and cooling supply systems. Each set of heat demand points (H) consists of one or more heat demand points (H). Multiple heat supply systems are provided, the number of which corresponds to the number of sets of heat demand points (H). These multiple heat supply systems are distributed and arranged one-to-one at each of the multiple sets of heat demand points (H) to supply heat to the heat demand points (H). Each heat supply system can independently adjust the heat supply temperature according to the temperature requirements of the corresponding heat demand point (H). The cooling supply system is simultaneously connected to multiple cooling demand points (C) to supply cooling to these multiple cooling demand points (C); the heat supply system includes a first water pump (13), a hot water tank (14), and a condenser (112) of the heat pump (11). A hot water pipe (16) is provided between the hot water tank (14) and the condenser (112). The first water pump (13) is installed on the hot water pipe (16). The condenser (112) is connected to the heat demand point (H). The first water pump (13) is used to drive the hot water circulation to ensure that hot water flows from the hot water tank (14) to the cooling point (C). The condenser (112) heats the hot water drawn from the hot water tank (14) by the first water pump (13) to provide heat to the heat demand point (H). The cooling supply system includes a refrigeration unit, and chilled water supply pipes (903) are provided between the refrigeration unit and each of the multiple cooling demand points (C). The chilled water supply pipes (903) are used to transport the cooling generated by the refrigeration unit to each cooling demand point (C) via chilled water. The multiple cooling demand points (C) are also connected to the refrigeration unit by a chilled water supply pipe. The system includes a chilled water return pipe (904), and multiple chilled water return pipes (904) merge into a single chilled water main pipe; it also includes a cold energy recovery system, which includes an evaporator (111) of a heat pump (11). A first branch pipe (905) and a second branch pipe (906) are provided between the evaporator (111) and the chilled water return pipe (904). The chilled water exchanges heat through the evaporator (111), and after recovering the cold energy of the evaporator (111), the temperature decreases. The chilled water then flows back to the cold energy supply system through the second branch pipe (906), thereby realizing the recovery and recycling of cold energy to reduce the load and energy consumption of the refrigeration unit.

2. The distributed heat supply and cold energy recovery system according to claim 1, characterized in that, The cooling supply system also includes a second water pump (902), which is installed on the chilled water main pipe and is used to drive the chilled water to circulate in the pipe to ensure a continuous supply of cooling capacity.

3. The distributed heat supply and cold energy recovery system according to claim 2, characterized in that, It also includes a heat replenishment device (15) connected to the hot water tank (14).

4. The distributed heat supply and cold energy recovery system according to claim 3, characterized in that, The heating device (15) can be directly connected to the hot water tank (14) or it can be connected through the heating pipe (21). When the heating device (15) and the hot water tank (14) are connected through the heating pipe (21), a heating circulation pump (26) is installed on the heating pipe (21).

5. The distributed heat supply and cold energy recovery system according to claim 4, characterized in that, It also includes a control system and a first temperature sensor and a second temperature sensor that are electrically or signal-connected to the control system. The control system controls the opening and closing of the refrigeration unit and the heat replenishment equipment (15) through the monitoring data of the first temperature sensor and the second temperature sensor.

6. The distributed heat supply and cold energy recovery system according to claim 5, characterized in that, The first temperature sensor is installed on the chilled water return pipe (904) to monitor the temperature of the chilled water return in real time, and the second temperature sensor is installed on the hot water tank (14) and / or the hot water pipe (16) to monitor the hot water temperature in real time.

7. The distributed heat supply and cold energy recovery system according to claim 6, characterized in that, When the return water temperature measured by the first temperature sensor is lower than the set value, the control system shuts down the refrigeration unit to reduce the generation of cooling capacity. After the refrigeration unit is shut down, when the hot water temperature measured by the second temperature sensor is lower than the set value, the control system turns on the heat replenishment device (15) to ensure that there is enough heat to be provided to the heat demand point (H).

8. The distributed heat supply and cold energy recovery system according to claim 7, characterized in that, When the hot water temperature measured by the second temperature sensor is higher than the set value, the control system shuts down the supplementary heating device (15) to reduce the generation of heat and prevent the hot water temperature from being too high. After the supplementary heating device (15) is shut down, when the chilled water temperature measured by the first temperature sensor is higher than the set value, the control system turns on the refrigeration unit to ensure that there is enough cooling capacity to be provided to the cooling demand point (C).

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