Building heat rejection system combining organic rankine cycle with night-time radiation heat dissipation

Abstract

This invention relates to the field of building energy conservation and refrigeration technology, and provides a building heat dissipation system combining organic Rankine cycle and nighttime radiative heat dissipation. The system includes an evaporator, a generator set, a nighttime radiative heat dissipation device, a working fluid pump, a working fluid storage device, and an electricity storage device. This system absorbs the heat transferred to the indoor side by the phase change material layer during summer nights and dissipates the heat to the external environment in the form of thermal radiation. This achieves cooling of the phase change material layer during summer nights, ensuring the phase change material's effect of reducing indoor temperature rise during the day, while maintaining indoor thermal comfort at night. Through the organic Rankine cycle, it achieves the purpose of generating electricity using a low-temperature heat source, fully utilizing the waste heat of the phase change material layer, improving the system's energy utilization rate, achieving self-sustaining operation, and exhibiting good stability. This effectively improves the building energy conservation technology of applying phase change materials in walls and contributes to achieving energy conservation goals.

Description

Technical Field

[0001] This invention belongs to the field of building energy conservation and refrigeration technology, and in particular relates to a building heat dissipation system that combines organic Rankine cycle with nighttime radiative heat dissipation. Background Technology

[0002] In recent years, energy conservation and emission reduction technologies have received increasing attention worldwide. Among these, the application of phase change materials (PCMs) in building walls to reduce energy consumption for cooling or heating has become a focal point in building energy conservation. This technology utilizes the high energy density of PCMs during the phase change process to store heat during the day and release it at night, thereby reducing indoor temperature fluctuations and controlling them within a range close to comfortable levels, thus reducing the building's cooling or heating load. However, PCM technology still has certain drawbacks. For example, in areas with small diurnal temperature differences during summer, the small temperature difference between the PCM and the nighttime environment often results in the PCM melting and absorbing heat during the day, leading to insufficient heat dissipation at night and incomplete solidification, or even no solidification at all. This impairs or even completely disables the PCM's ability to reduce indoor temperature increases during the day. Furthermore, when the PCM in building walls solidifies and releases heat at night, it not only dissipates heat to the outside but also conducts some heat into the room. In most parts of my country, indoor and outdoor temperatures remain high at night during summer. Therefore, the process of the PCM conducting heat into the room not only compromises indoor thermal comfort during summer nights but also increases the nighttime cooling load. In view of the above drawbacks, it is necessary to invent a building heat dissipation system that helps the phase change material inside the building walls to dissipate heat to the outside and further reduce the indoor temperature during summer nights.

[0003] For various heat dissipation systems utilizing phase change materials, current mainstream technologies employ traditional liquid or air cooling methods powered by equipment such as water pumps or fans. While these methods achieve the purpose of heat dissipation and cooling, they inevitably increase the additional consumption of high-grade energy, weakening the energy-saving effect of energy-saving and emission-reduction devices. Therefore, it is necessary to invent a self-sustaining building heat dissipation system that generates its own electricity to power the power-consuming equipment. Summary of the Invention

[0004] The purpose of this invention is to provide a building heat dissipation system that combines organic Rankine cycle with nighttime radiative heat dissipation, aiming to solve the problems mentioned in the background art.

[0005] The present invention is implemented as follows: a building heat dissipation system combining organic Rankine cycle and nighttime radiative heat dissipation includes an evaporator, a generator set, a nighttime radiative heat dissipation device, a working fluid pump, a working fluid storage device, and an electricity storage device.

[0006] The evaporator and the working fluid pump are both installed in the wall between the indoor environment and the phase change material layer, and the evaporator is installed close to the phase change material layer. The evaporator includes a liquid storage evaporation main pipe, an evaporation branch pipe and a pressure control outlet valve.

[0007] The generator set is installed on the top of the building and includes a centrifugal expander, a generator, and a power transmission line.

[0008] The nighttime radiant heat dissipation device is also installed on the top of the building, and the nighttime radiant heat dissipation device is equipped with heat dissipation pipes inside.

[0009] The working fluid storage device is located underground in the building. The working fluid storage device includes a working fluid storage tank and a pump, and the circulating heat transfer fluid in the system is a low-boiling-point organic compound.

[0010] The system includes multiple evaporation branch pipes, with the lower end of each branch pipe connected to the outlet of a liquid storage evaporation main pipe located at the bottom of the building wall. The upper end of each branch pipe is connected to the inlet of a first main pipe located at the top of the building wall, and the outlet of the first main pipe is connected to the inlet of a centripetal expander. A pressure control outlet valve is located at the inlet of the first main pipe to control the steam pressure before it is discharged from the evaporator and enters the centripetal expander via the first main pipe. The exhaust port of the centripetal expander is connected to the inlet of a heat dissipation pipe via a second main pipe, and the outlet of the heat dissipation pipe is connected to the inlet of a third main pipe. The three main pipes are connected to the inlet of the working fluid pump. The centripetal expander is connected to the generator via mechanical transmission. The generator is connected to the input interface of the power storage device via a power transmission line. One output interface of the power storage device is connected to the power transmission interface of the working fluid pump via a power transmission line. The other output interface of the power storage device is connected to the power transmission interface of the liquid pump via a power transmission line. The outlet of the working fluid pump is connected to the inlet of the liquid storage evaporation main pipe. The working fluid storage tank and the liquid storage evaporation main pipe are connected via the storage main pipe and the liquid extraction main pipe. The liquid extraction pump is installed on the liquid extraction main pipe.

[0011] In a further technical solution, a liquid storage valve is installed on the storage trunk line, and a liquid extraction valve is installed on the extraction trunk line.

[0012] In a further technical solution, the working fluid storage tank is located at a depth of 10-20 meters underground.

[0013] In a further technical solution, the evaporation branch pipes are distributed in a dense parallel configuration between the liquid storage evaporation main pipe and the first main pipe.

[0014] In a further technical solution, the heat dissipation pipe is arranged in the form of a serpentine pipe.

[0015] In a further technical solution, the first main pipe, the second main pipe, and the third main pipe are all made of materials with good thermal insulation properties.

[0016] In a further technical solution, the valve orifice of the pressure control outlet valve is a variable orifice, and the orifice can be intelligently controlled by temperature.

[0017] In a further technical solution, the boiling point of the circulating heat transfer fluid under standard atmospheric pressure should be below 0°C and above -30°C.

[0018] In a further technical solution, the circulating heat transfer medium should be an environmentally friendly medium with zero ozone depletion potential and low global warming potential, such as R600a and HFE-143a (trifluoromethyl methyl ether).

[0019] The building heat dissipation system combining organic Rankine cycle and nighttime radiative heat dissipation provided in this invention has the following beneficial effects:

[0020] (1) This system can absorb the heat transferred from the phase change material layer to the indoor side during summer nights and dissipate the heat to the low-temperature external environment in the form of thermal radiation through night sky radiation cooling technology. This achieves the cooling of the phase change material layer during summer nights, ensures the effect of the phase change material in reducing the indoor temperature rise during the day, maintains the indoor thermal comfort at night, reduces the cooling demand load at night, and effectively improves the building energy-saving technology of applying phase change materials in the wall.

[0021] (2) By setting up an organic Rankine cycle, the purpose of using low-temperature heat sources to generate electricity is realized. The waste heat of the phase change material layer is fully utilized, the energy utilization rate of the system is improved, the self-sustaining operation of the system is realized, and the additional consumption of high-grade external energy is avoided, which helps to achieve the purpose of energy conservation.

[0022] (3) By replacing the traditional condenser in the organic Rankine cycle with a nighttime radiative heat dissipation device, the power cycle and refrigeration technology are innovatively combined. The system simultaneously achieves the dual purpose of generating electricity and generating cooling capacity, saving system layout space and having the advantages of high flexibility, high safety and low maintenance requirements.

[0023] (4) By setting up an electric storage device, the system can store excess electrical energy, balance and distribute power, and stabilize output voltage, thus ensuring good stability and continuity of system operation.

[0024] (5) By setting up densely connected parallel evaporation branch pipes in the evaporator, the heat flow between the evaporator and the phase change material layer is greatly improved, so that the evaporator can fully absorb the heat transferred from the phase change material layer to the indoor side, further ensuring the indoor thermal comfort. Its structure is simple and its effect is obvious.

[0025] (6) The pressure of the high-pressure steam introduced into the centripetal expander is controlled by the pressure control outlet valve, and the extraction of the circulating heat transfer medium at the beginning of summer and the storage of the circulating heat transfer medium at the end of summer are controlled by the extraction valve, extraction pump and storage valve. The control is simple and efficient. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of a building heat dissipation system that combines organic Rankine cycle with nighttime radiative heat dissipation, provided by an embodiment of the present invention.

[0027] Figure 2 This is a cross-sectional view of a building heat dissipation system that combines organic Rankine cycle with nighttime radiative heat dissipation, provided in an embodiment of the present invention.

[0028] Figure 3 A schematic diagram of the arrangement of evaporation branch pipes in a building heat dissipation system that combines organic Rankine cycle with nighttime radiative heat dissipation, provided as an embodiment of the present invention;

[0029] Figure 4 This is a schematic diagram of the arrangement of heat dissipation pipes inside a nighttime radiant heat dissipation device in a building heat dissipation system that combines organic Rankine cycle and nighttime radiant heat dissipation, provided as an embodiment of the present invention.

[0030] In the attached diagram: 1-Evaporator; 101-Storage evaporation main pipe; 102-Evaporation branch pipe; 103-Pressure control outlet valve; 2-Generator set; 201-Centrifugal expander; 202-Generator; 203-Transmission line; 3-Nighttime radiant heat dissipation device; 301-Heat dissipation pipeline; 4-Working fluid pump; 5-Working fluid storage device; 501-Working fluid storage tank; 502-Liquid extraction pump; 503-Storage valve; 504-Liquid extraction valve; 6-Electricity storage device; 7-First main pipe; 8-Second main pipe; 9-Third main pipe; 10-Storage main pipe; 11-Liquid extraction main pipe; 12-Phase change material layer. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0032] The specific implementation of the present invention will be described in detail below with reference to specific embodiments.

[0033] like Figure 1-4As shown, a building heat dissipation system combining organic Rankine cycle and nighttime radiative heat dissipation is provided in one embodiment of the present invention, including: evaporator 1, generator set 2, nighttime radiative heat dissipation device 3, working fluid pump 4, working fluid storage device 5 and power storage device 6;

[0034] The evaporator 1 and the working fluid pump 4 are both installed in the wall between the indoor environment and the phase change material layer 12, and the evaporator 1 is installed close to the phase change material layer 12. The evaporator 1 includes a liquid storage evaporation main pipe 101, an evaporation branch pipe 102 and a pressure control outlet valve 103.

[0035] The generator set 2 is installed on the top of the building, and the generator set 2 includes a centrifugal expander 201, a generator 202 and a power transmission line 203;

[0036] The nighttime radiant heat dissipation device 3 is also installed on the top of the building, and the nighttime radiant heat dissipation device 3 is equipped with a heat dissipation pipe 301 inside;

[0037] The working fluid storage device 5 is located underground in the building. The working fluid storage device 5 includes a working fluid storage tank 501 and a liquid pump 502. The circulating heat transfer fluid in the system is a low-boiling-point organic compound.

[0038] The evaporation branch pipes 102 are provided in multiple configurations. The lower end of each evaporation branch pipe 102 is connected to the outlet of the liquid storage evaporation main pipe 101 located at the bottom of the building wall. The upper end of each evaporation branch pipe 102 is connected to the inlet of the first main pipe 7 located at the top of the building wall. The outlet of the first main pipe 7 is connected to the inlet of the centripetal expander 201. The pressure control outlet valve 103 is located near the inlet of the first main pipe 7 and is used to control the steam to reach a sufficiently high pressure before it can be discharged from the evaporator 1 and enter the centripetal expander 201 via the first main pipe 7. The exhaust port of the centripetal expander 201 is connected to the inlet of the heat dissipation pipe 301 via the second main pipe 8. The outlet of the heat dissipation pipe 301 is connected to the inlet of the working fluid pump 4 via the third main pipe 9. The centripetal expander 201 is connected to the generator 202 via mechanical transmission. The generator 202 is connected to the input interface of the power storage device 6 via the power transmission line 203. One output interface of the power storage device 6 is connected to the power transmission interface of the working fluid pump 4 via the power transmission line 203 to provide power for the operation of the working fluid pump 4. The other output interface of the power storage device 6 is connected to the power transmission interface of the liquid pump 502 via the power transmission line 203. The outlet of the working fluid pump 4 is connected to the inlet of the liquid storage evaporation dry pipe 101. The working fluid storage tank 501 and the liquid storage evaporation dry pipe 101 are connected via the storage dry pipe 10 and the liquid pumping dry pipe 11. The liquid pump 502 is installed on the liquid pumping dry pipe 11.

[0039] In this embodiment of the invention, the system operates only during summer nights. When the phase change material in the wall solidifies and releases heat at night, the evaporator 1 absorbs the heat conducted from the phase change material layer 12 towards the interior of the building, causing the liquid circulating heat transfer medium inside the evaporator 1 to evaporate and form high-pressure steam. This high-pressure steam is then fed into the generator set 2 to generate electricity, thus converting some of the heat into electrical energy. The exhaust steam from the generator set 2 enters the nighttime radiative cooling device 3, where some of the heat is dissipated to the low-temperature external environment through nighttime sky radiative cooling technology. The exhaust steam condenses into a liquid state in the nighttime radiative cooling device 3. The circulating heat transfer fluid flows into the working fluid pump 4 for pressurization, and then flows back into the evaporator 1 for circulation. The electrical energy generated by the generator set 2 is input into the power storage device 6 for storage, thereby realizing the planned application of electrical energy and coordinating changes in electrical energy output. The power storage device 6 supplies electrical energy to the working fluid pump 4 and the liquid pump 502 to provide power, thereby realizing the self-sustaining operation of the system. When summer begins, the circulating heat transfer fluid is drawn from the working fluid storage device 5 into the evaporator 1 to start the system operation. When summer ends, the circulating heat transfer fluid is stored in the working fluid storage device 5.

[0040] like Figure 2 As shown, in a preferred embodiment of the present invention, a liquid storage valve 503 is provided on the storage trunk 10, and a liquid extraction valve 504 is provided on the extraction trunk 11.

[0041] In this embodiment of the invention, when summer begins, the extraction valve 504 is opened and the extraction pump 502 is run to draw the circulating heat transfer medium from the working medium storage tank 501 into the storage evaporation tube 101, thus starting the self-sustaining system. After the extraction is completed, the extraction valve 504 is closed and the extraction pump 502 is stopped. When summer ends, the storage valve 503 is opened, allowing the circulating heat transfer medium to flow into the working medium storage tank 501 under its own weight. After the circulating heat transfer medium has completely flowed into the working medium storage tank 501, the storage valve 503 is closed, allowing the circulating heat transfer medium to be sealed and stored in the working medium storage tank 501.

[0042] In a preferred embodiment of the present invention, the working fluid storage tank 501 is located at a depth of 10-20 meters underground to reduce the impact of annual surface temperature fluctuations on the circulating heat transfer fluid stored in the working fluid storage tank 501.

[0043] like Figure 2 As shown, in a preferred embodiment of the present invention, the evaporation branch pipes 102 are distributed in a dense parallel manner between the liquid storage evaporation main pipe 101 and the first main pipe 7, which increases the heat transfer area, improves the heat flow between the evaporator 1 and the phase change material layer 12, and thus greatly improves the evaporation rate of the circulating heat transfer medium in the evaporator 1.

[0044] In a preferred embodiment of the present invention, the heat dissipation pipe 301 is arranged in the form of a serpentine pipe, which increases the length of the flow channel of the low-pressure exhaust steam in the heat dissipation pipe 301, so that the low-pressure exhaust steam can be fully heat exchanged and condensed into liquid in the heat dissipation pipe 301.

[0045] In a preferred embodiment of the present invention, the first main pipe 7, the second main pipe 8, and the third main pipe 9 are all made of materials with good thermal insulation properties to reduce the impact of heat exchange between the circulating heat transfer fluid and the external environment through the pipe wall on the stable operation of the self-maintaining system.

[0046] In a preferred embodiment of the present invention, the valve orifice of the pressure control outlet valve 103 is a variable orifice, and the orifice can be intelligently controlled by temperature.

[0047] In this embodiment of the invention, the pressure control outlet valve 103 adopts a variable orifice to match the changes in the evaporation rate of the liquid circulating heat transfer fluid in the evaporator 1 caused by the phase change material layer 12 being at different temperatures at different nights and at different times of the same night. By intelligently adjusting the valve orifice of the pressure control outlet valve 103 to match the temperature of the phase change material layer 12 at different times, it is ensured that the steam flow rate discharged from the evaporator 1 is always equal to the evaporation amount of the liquid circulating heat transfer fluid in the evaporator 1.

[0048] In a preferred embodiment of the present invention, the boiling point of the circulating heat transfer fluid under standard atmospheric pressure should be below 0°C and above -30°C.

[0049] In this embodiment of the invention, the temperature of the phase change material layer 12, which serves as the low-temperature heat source in the organic Rankine cycle, is typically 20-30°C. Therefore, the boiling point of the selected circulating heat transfer medium under standard atmospheric pressure should be below 0°C to ensure sufficient heat exchange temperature difference between the heat source and the liquid circulating heat transfer medium, thereby ensuring the evaporation rate of the liquid circulating heat transfer medium. At the same time, it also ensures that the circulating heat transfer medium can form superheated steam with sufficiently high pressure, so that the thermal efficiency of the organic Rankine cycle is not too low. The boiling point of the selected circulating heat transfer medium under standard atmospheric pressure should be above -30°C to avoid the huge challenge that excessively low boiling point would pose to the storage and operation of the circulating heat transfer medium.

[0050] In a preferred embodiment of the present invention, the circulating heat transfer fluid should be an environmentally friendly fluid with zero ozone depletion potential and low global warming potential, such as R600a and HFE-143a (trifluoromethyl methyl ether), to meet environmental protection requirements.

[0051] Working principle: The liquid storage evaporation main pipe 101 in evaporator 1 is the main body for storing the liquid circulating heat transfer medium. It also plays a role in evaporating the liquid circulating heat transfer medium to a certain extent. The liquid storage evaporation main pipe 101 distributes the liquid circulating heat transfer medium to each evaporation branch pipe 102. The evaporation branch pipe 102 is close to the phase change material layer 12 and can absorb the heat conducted to the indoor side when the phase change material solidifies and cool the phase change material layer 12. The evaporation branch pipe 102 adopts a dense parallel arrangement to increase the total heat transfer area between it and the phase change material layer 12, thereby increasing the heat flow between the evaporation branch pipe 102 and the phase change material layer 12, and thus greatly improving the total evaporation rate of the liquid working medium in evaporator 1. Therefore, the evaporation branch pipe 102 is the main structure in evaporator 1 that causes the liquid circulating heat transfer medium to evaporate. The liquid circulating heat transfer fluid at the lower end of the evaporation branch pipe 102 is heated and evaporates to form steam that flows upward. During this upward flow, it continues to be heated by the pipe wall, forming superheated steam. Therefore, the entire evaporation branch pipe 102 is a heating section. Simultaneously, the dense parallel arrangement of the evaporation branch pipes 102 ensures that the heat conducted from the phase change material layer 12 to the indoor side is fully absorbed, thus guaranteeing adequate thermal comfort inside the building. The superheated steam flows from the top of each evaporation branch pipe 102 into the first main pipe 7. Only when the steam pressure exceeds the set pressure threshold of the pressure control outlet valve 103 will the pressure control outlet valve 103 open, allowing steam to flow in the first main pipe 7. This ensures that the steam reaches a sufficiently high pressure before being discharged from the evaporator 1 and entering the centripetal expander 201 via the first main pipe 7, guaranteeing the high-pressure steam supply required for the centripetal expander 201 to perform its work. Therefore, the steam pressure in the evaporator 1 is low during the initial operation of the system, and the system's heat transfer fluid circulation pipeline is not fully connected. As the evaporation process progresses, the steam pressure gradually increases until it reaches the set pressure threshold. At this point, the pressure control outlet valve 103 opens, fully connecting the system's heat transfer fluid circulation pipeline, and the entire system enters its formal operating phase. Evaporator 1 also enters the constant-pressure evaporation phase. The orifice diameter of the pressure control outlet valve 103 is rationally designed to ensure that the steam flow rate discharged from evaporator 1 is equal to the evaporation rate of the liquid circulating heat transfer fluid within evaporator 1. This allows evaporator 1 to continuously provide stable high-pressure steam to centrifugal expander 201, guaranteeing stable operation of centrifugal expander 201 within each individual time period. The orifice diameter of the pressure control outlet valve 103 is variable to accommodate changes in the evaporation rate of the liquid circulating heat transfer fluid within evaporator 1 caused by different temperatures in the phase change material layer 12 at different times of the night and at different times of the same night. By intelligently adjusting the orifice diameter of the pressure control outlet valve 103 to match the temperature of the phase change material layer 12 at different times, it ensures that the steam flow rate discharged from evaporator 1 is always equal to the evaporation rate of the liquid circulating heat transfer fluid within evaporator 1.

[0052] High-pressure steam is introduced into the centripetal expander 201 and expands therein to do work. It then becomes low-pressure exhaust steam and flows into the second main pipe 8. The centripetal expander 201 drives the generator 202 through mechanical transmission. The generator 202 converts mechanical energy into electrical energy. The generator 202 transmits the generated electrical energy to the power storage device 6 through the transmission line 203. The power storage device 6 also provides power for the operation of the working fluid pump 4 and the liquid pump 502. Since the temperature of the phase change material layer 12 gradually decreases at night, the evaporation rate of the liquid circulating heat transfer medium in the evaporator 1 also gradually decreases. Therefore, the power generation of the generator set 2 is not stable and decreases gradually with the night. The power storage device 6 can store excess electrical energy, balance and distribute power, and stabilize the output voltage. Since the phase change material layer 12 of the building is a relatively low-temperature heat source even within the application range of the organic Rankine cycle, the cycle thermal efficiency of this system is low, and the power generation of generator set 2 is relatively limited. Therefore, priority is given to using the generated electrical energy to maintain the system's own power-consuming components, namely the working fluid pump 4 and the liquid pump 502, thereby achieving self-sustaining operation of the system. If, during application, the power storage device 6 still has a significant surplus after meeting the system's own power needs, it can be considered for further grid connection or to power other electrical equipment.

[0053] Low-pressure exhaust steam flows into the nighttime radiative cooling device 3 through the second main pipe 8. Heat exchange between the low-pressure exhaust steam and the nighttime radiative cooling device 3 is achieved through the cooling pipe 301. The nighttime radiative cooling device 3 utilizes nighttime sky radiative cooling technology, which can cool itself by radiating energy to the low-temperature sky at night. Therefore, the low-pressure exhaust steam is cooled inside the nighttime radiative cooling device 3 and then recondenses into a liquid state. The heat absorbed from the low-pressure exhaust steam is dissipated into outer space at night through thermal radiation. The nighttime radiative cooling device 3 functions as a traditional condenser in an organic Rankine cycle. The recondensed liquid circulating heat transfer fluid flows into the working fluid pump 4 through the third main pipe 9 for compression. The pressurized liquid circulating heat transfer fluid re-enters the liquid storage evaporation main pipe 101 for the next working cycle.

[0054] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A building heat rejection system combining organic Rankine cycle with night radiation heat dissipation, characterized in that, The system comprises an evaporator, a generator set, a night radiation heat dissipation device, a working medium pump, a working medium storage device and a power storage device. The evaporator and the working medium pump are arranged in the wall between the indoor environment and the phase change material layer, and the evaporator is arranged close to the phase change material layer, and the evaporator comprises a liquid storage evaporating main pipe, an evaporating branch pipe and a pressure control outlet valve. The generator set is arranged on the top of the building, and the generator set comprises a centrifugal expander, a generator and a power transmission line. The night radiation heat dissipation device is also arranged on the top of the building, and the night radiation heat dissipation device is internally provided with a heat dissipation pipeline. The working medium storage device is arranged underground, and the working medium storage device comprises a working medium storage tank and a liquid pumping pump, and the circulating heat carrying working medium in the system is a low-boiling-point organic matter. The lower end of the evaporating branch pipe is communicated with the outlet of the liquid storage evaporating main pipe at the bottom end of the wall of the building, the upper end of the evaporating branch pipe is communicated with the inlet of the first main pipe at the top end of the wall of the building, the outlet of the first main pipe is communicated with the inlet of the centrifugal expander, the pressure control outlet valve is arranged at the inlet end of the first main pipe, so that the steam can be discharged from the evaporator and enter the centrifugal expander through the first main pipe only when the steam reaches a specified pressure, the steam outlet of the centrifugal expander is communicated with the inlet of the heat dissipation pipeline through a second main pipe, the outlet of the heat dissipation pipeline is communicated with the inlet of the working medium pump through a third main pipe, the centrifugal expander is connected with the generator in a mechanical transmission mode, the generator is connected with the input interface of the power storage device through the power transmission line, one output interface of the power storage device is connected with the power transmission interface of the working medium pump through the power transmission line, the other output interface of the power storage device is connected with the power transmission interface of the liquid pumping pump through the power transmission line, the outlet of the working medium pump is communicated with the inlet of the liquid storage evaporating main pipe, the working medium storage tank and the liquid storage evaporating main pipe are communicated through a storage main pipe and a liquid pumping main pipe, and the liquid pumping pump is arranged on the liquid pumping main pipe.

2. The ORC system combined with the building heat rejection system of claim 1, wherein, A liquid storage valve is arranged on the pipeline of the storage main pipe, and a liquid pumping valve is arranged on the pipeline of the liquid pumping main pipe.

3. The ORC system combined with the building heat rejection system of Claim 1, wherein, The working medium storage tank is arranged at a position with a depth of 10-20 meters underground.

4. The ORC system combined with the building heat rejection system of Claim 1, wherein, The evaporating branch pipes are densely and parallelly arranged between the liquid storage evaporating main pipe and the first main pipe.

5. The ORC system combined with the building heat rejection system of claim 4, wherein, The heat dissipation pipeline is arranged in the form of a serpentine pipeline.

6. The ORC system combined with the building heat rejection system of Claim 1, wherein, The first main pipe, the second main pipe and the third main pipe are made of heat insulation materials.

7. The ORC system combined with the building heat rejection system of Claim 1, wherein, The valve hole diameter of the pressure control outlet valve is variable, and the hole diameter is intelligently controlled by temperature.

8. The ORC system combined with the building heat rejection system of claim 1, wherein, The boiling point of the circulating heat carrying working medium under standard atmospheric pressure should be lower than 0℃ and higher than -30℃.

9. The ORC system combined with the building heat rejection system of claim 8, wherein, The circulating heat carrying working medium is R600a or HFE-143a.

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