A chiller waste heat recycling device based on temperature change
By installing an air-cooled and medium-circulation waste heat recovery system in the chiller, and automatically switching modes according to temperature, the problem of the inability to recover and utilize waste heat from the chiller is solved. This achieves cascade utilization and precise recovery of waste heat, providing hot water for domestic use and equipment cleaning, and improving energy efficiency.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- SHIJIAZHUANG JULITE MACHINERY
- Filing Date
- 2026-04-07
- Publication Date
- 2026-06-12
AI Technical Summary
The waste heat generated by existing chillers during operation cannot be effectively recovered and utilized, resulting in energy waste, especially in large industrial plants where heat emissions are serious during long-term continuous operation.
Design a waste heat recovery and utilization device for a chiller based on temperature change, including an air-cooled waste heat recovery system and a medium circulation waste heat recovery system. The system is automatically switched by solenoid valve control. Waste heat is recovered according to different modes of workshop temperature. At low temperature, the heat is released into the environment, and at high temperature, it is used for water heating.
It enables the cascaded utilization and precise recovery of waste heat from the chiller, effectively avoiding energy waste, providing hot water for domestic use or equipment cleaning, and improving energy efficiency.
Smart Images
Figure CN122191833A_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of waste heat recovery and utilization of chillers, specifically a waste heat recovery and utilization device for chillers based on temperature changes. Background Technology
[0002] Chillers are refrigeration equipment widely used in industrial production and commercial buildings. Their main function is to transfer heat from low-temperature areas to high-temperature areas through a refrigeration cycle, thereby cooling process water. During traditional chiller operation, a significant amount of heat is generated, which cannot be recovered and reused, resulting in energy waste. This is especially true in large industrial plants where chiller units typically operate continuously for extended periods, emitting substantial amounts of heat. Therefore, how to rationally recover and utilize the heat emitted by chillers is a pressing technical problem that needs to be solved. Summary of the Invention
[0003] This invention provides a waste heat recovery and utilization device for chillers based on temperature changes, in order to overcome the deficiencies in the prior art.
[0004] This invention is achieved through the following technical solution: A waste heat recovery and utilization device for a chiller based on temperature change includes an air-cooled waste heat recovery system and a medium circulation waste heat recovery system. The air-cooled waste heat recovery system is activated when the workshop temperature is ≤10℃ to recover and utilize the waste heat generated during the operation of the chiller. The medium circulation waste heat recovery system is activated when the workshop temperature is >10℃ to recover and utilize the waste heat generated during the operation of the chiller.
[0005] As described above, a waste heat recovery device for a chiller based on temperature changes includes an air-cooled waste heat recovery system comprising an air-cooled heat exchanger. The air-cooled heat exchanger is connected to the external environment. The heat exchange inlet of the air-cooled heat exchanger is connected to one end of a first pipeline, and the other end of the first pipeline is connected to the outlet of a compressor. The inlet of the compressor is connected to one end of a second pipeline, and the other end of the second pipeline is connected to the heat exchange outlet of an evaporator. The heat exchange inlet of the evaporator is connected to one end of a third pipeline, and the other end of the third pipeline is connected to the heat exchange outlet of the air-cooled heat exchanger. A first solenoid valve is installed on the first pipeline, and a second solenoid valve is installed on the third pipeline. The water inlet and outlet pipes of the evaporator are respectively connected to the water outlet and water inlet of the cooling system.
[0006] In the waste heat recovery and utilization device for a chiller based on temperature changes described above, the first solenoid valve and the second solenoid valve can be controlled by a processor to open and close.
[0007] As described above, a waste heat recovery device for a chiller based on temperature changes includes a shell-and-tube heat exchanger. The heat exchange medium inlet pipe of the shell-and-tube heat exchanger is connected to one end of a fourth pipe, and the other end of the fourth pipe is connected to the outlet of a compressor. The compressor inlet is connected to one end of a second pipe, and the other end of the second pipe is connected to the heat exchange outlet of an evaporator. The evaporator heat exchange inlet is connected to one end of a fifth pipe, and the other end of the fifth pipe is connected to the heat exchange medium outlet of the shell-and-tube heat exchanger. A third solenoid valve is installed on the fourth pipe, and a fourth solenoid valve is installed on the fifth pipe. The evaporator's inlet and outlet pipes are respectively connected to the outlet and inlet of a cooling system. The bottom of the shell-and-tube heat exchanger is connected to a cold water inlet pipe, and the top of the shell-and-tube heat exchanger is connected to a hot water outlet pipe.
[0008] In the waste heat recovery and utilization device for a chiller based on temperature changes described above, the third and fourth solenoid valves can be controlled by a processor to open and close.
[0009] As described above, in a waste heat recovery device for a chiller based on temperature changes, the fourth and fifth pipes are made of high-pressure hoses and are detachable.
[0010] As described above, in a chiller waste heat recovery and utilization device based on temperature change, a fifth solenoid valve is installed on the chilled water inlet pipe.
[0011] As described above, in a chiller waste heat recovery and utilization device based on temperature change, the shell and tube heat exchanger is mounted on a support.
[0012] The advantages of this invention are: by setting up an air-cooled waste heat recovery system and a medium-circulation waste heat recovery system, this invention can automatically switch the waste heat recovery mode according to the changes in workshop temperature, realizing the cascade utilization and precise recovery of waste heat from the chiller; when the workshop temperature is low, the air-cooled waste heat recovery system directly releases the heat discharged from the chiller into the workshop environment to raise the workshop temperature; when the workshop temperature is high, the medium-circulation waste heat recovery system uses the heat for water heating, and the heated water can be used as domestic water or for other hot water needs, such as meeting the hot water needs of employees for showering and equipment cleaning, thereby effectively avoiding energy waste. Attached Figure Description
[0013] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the 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 based on these drawings without creative effort.
[0014] Figure 1 This is a schematic diagram of the structure of the present invention.
[0015] Reference numerals in the attached diagram: 1. Chiller; 2. Air-cooled heat exchanger; 3. First pipeline; 4. Compressor; 5. Second pipeline; 6. Evaporator; 7. Third pipeline; 8. First solenoid valve; 9. Second solenoid valve; 10. Inlet pipe; 11. Outlet pipe; 12. Shell-and-tube heat exchanger; 13. Fourth pipeline; 14. Fifth pipeline; 15. Third solenoid valve; 16. Fourth solenoid valve; 17. Cold water inlet pipe; 18. Hot water outlet pipe; 19. Fifth solenoid valve; 20. Support bracket. Detailed Implementation
[0016] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. 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.
[0017] A waste heat recovery and utilization device for a chiller based on temperature changes includes an air-cooled waste heat recovery system and a medium-circulation waste heat recovery system. The air-cooled waste heat recovery system activates when the workshop temperature is ≤10℃ to recover and utilize the waste heat generated during the operation of the chiller 1. The medium-circulation waste heat recovery system activates when the workshop temperature is >10℃ to recover and utilize the waste heat generated during the operation of the chiller 1. This invention, by setting up the air-cooled waste heat recovery system and the medium-circulation waste heat recovery system, can automatically switch the waste heat recovery mode according to changes in workshop temperature, achieving tiered utilization and precise recovery of waste heat from the chiller. When the workshop temperature is low, the air-cooled waste heat recovery system directly releases the heat discharged from the chiller into the workshop environment to raise the workshop temperature. When the workshop temperature is high, the medium-circulation waste heat recovery system uses the heat for water heating, and the heated water can be used as domestic water or for other hot water needs, such as meeting the hot water needs for employee showers and equipment cleaning, thereby effectively avoiding energy waste.
[0018] Specifically, the air-cooled waste heat recovery system described in this embodiment includes an air-cooled heat exchanger 2. The air-cooled heat exchanger 2 is connected to the external environment. The heat exchange inlet of the air-cooled heat exchanger 2 is connected to one end of a first pipe 3, and the other end of the first pipe 3 is connected to the outlet of a compressor 4. The inlet of the compressor 4 is connected to one end of a second pipe 5, and the other end of the second pipe 5 is connected to the heat exchange outlet of an evaporator 6. The heat exchange inlet of the evaporator 6 is connected to one end of a third pipe 7, and the other end of the third pipe 7 is connected to the heat exchange outlet of the air-cooled heat exchanger 2. A first solenoid valve 8 is installed on the first pipe 3, and a second solenoid valve 9 is installed on the third pipe 7. The water inlet pipe 10 and water outlet pipe 11 of the evaporator 6 are respectively connected to the water outlet and water inlet of the cooling system. In this invention, the high-temperature, high-pressure medium gas is exchanged with the outside air through the air-cooled heat exchanger 2, dissipating the heat into the workshop environment. Furthermore, the air-cooled heat exchanger 2 adopts a finned heat exchange structure, which effectively ensures heat exchange efficiency.
[0019] Specifically, the first solenoid valve 8 and the second solenoid valve 9 described in this embodiment can be controlled by the processor to open and close. This invention, through the processor's precise control of the first solenoid valve 8 and the second solenoid valve 9, enables the automated operation of the air-cooled waste heat recovery system. When the workshop temperature sensor detects an ambient temperature ≤10℃, the processor receives the temperature information and controls the first solenoid valve 8 and the second solenoid valve 9 to open while keeping the third solenoid valve 15 and the fourth solenoid valve 16 closed (if it is for use, the first solenoid valve 8 and the second solenoid valve 9 are directly opened; if it is for switching operations, the third solenoid valve 15 and the fourth solenoid valve 16 are closed while the first solenoid valve 8 and the second solenoid valve 9 are opened simultaneously; when the chiller 1 is not in use, all solenoid valves are closed). This allows the medium to circulate sequentially through the compressor 4, the first pipeline 3, the air-cooled heat exchanger 2, the third pipeline 7, the evaporator 6, and the second pipeline 5. At this time, the air-cooled heat exchanger 2 releases the heat carried by the medium into the workshop environment to raise the workshop ambient temperature.
[0020] More specifically, the medium circulation waste heat recovery system described in this embodiment includes a shell-and-tube heat exchanger 12. The heat exchange medium inlet pipe of the shell-and-tube heat exchanger 12 is connected to one end of a fourth pipe 13, and the other end of the fourth pipe 13 is connected to the outlet of a compressor 4. The inlet of the compressor 4 is connected to one end of a second pipe 5, and the other end of the second pipe 5 is connected to the heat exchange outlet of an evaporator 6. The heat exchange inlet of the evaporator 6 is connected to one end of a fifth pipe 14, and the other end of the fifth pipe 14 is connected to the heat exchange medium outlet of the shell-and-tube heat exchanger 12. A third solenoid valve 15 is installed on the fourth pipe 13, and a fourth solenoid valve 16 is installed on the fifth pipe 14. The water inlet pipe 10 and the water outlet pipe 11 of the evaporator 6 are connected to the water outlet and water inlet of the cooling system, respectively. The bottom of the shell-and-tube heat exchanger 12 is connected to a cold water inlet pipe 17, and the top of the shell-and-tube heat exchanger 12 is connected to a hot water outlet pipe 18. In this invention, the shell-and-tube heat exchanger 12 adopts a shell-and-tube structure with heat exchange tubes inside. High-temperature and high-pressure medium gas flows inside the heat exchange tubes, while cold water flows in the gap between the tubes and the shell to achieve heat exchange. After absorbing heat, the cold water's temperature rises and it is discharged from the hot water outlet pipe 18, which can be used for domestic hot water needs such as employee bathing and equipment cleaning.
[0021] Furthermore, the third solenoid valve 15 and the fourth solenoid valve 16 described in this embodiment can be controlled by the processor to open and close. When the workshop temperature sensor detects that the ambient temperature is >10℃, the processor automatically opens the third solenoid valve 15 and the fourth solenoid valve 16 while keeping the first solenoid valve 8 and the second solenoid valve 9 closed, so that the medium passes through the compressor 4, the fourth pipeline 13, the shell and tube heat exchanger 12, the fifth pipeline 14, the evaporator 6, and the second pipeline 5 in sequence to complete the circulation. At this time, the shell and tube heat exchanger 12 transfers the heat carried by the medium to the cold water for the preparation of hot water, realizing the effective recovery and utilization of waste heat.
[0022] More specifically, the third solenoid valve 15 and the fourth solenoid valve 16 described in this embodiment can be controlled by the processor to open and close. This invention enables the automated operation of a medium circulation waste heat recovery system through precise control of the third solenoid valve 15 and the fourth solenoid valve 16 by the processor. When the workshop temperature sensor detects an ambient temperature >10℃, the processor receives the temperature information and controls the third solenoid valve 15 and the fourth solenoid valve 16 to open while keeping the first solenoid valve 8 and the second solenoid valve 9 closed (if it is for use, the third solenoid valve 15 and the fourth solenoid valve 16 are opened directly; if it is for switching operation, the first solenoid valve 8 and the second solenoid valve 9 are closed while the third solenoid valve 15 and the fourth solenoid valve 16 are opened simultaneously; when the chiller 1 is not in use, all solenoid valves are closed). This allows the high-temperature and high-pressure medium gas to pass sequentially through the compressor 4 and the fourth pipeline 13 into the shell and tube heat exchanger 12. After exchanging heat with the chilled water in the shell and tube heat exchanger 12, the medium returns to the compressor 4 through the fifth pipeline 14, the evaporator 6, and the second pipeline 5 to complete the cycle. At this time, the shell and tube heat exchanger 12 transfers the heat carried by the medium to the chilled water for the preparation of hot water, thus achieving effective recovery and utilization of waste heat.
[0023] Furthermore, the fourth pipe 13 and the fifth pipe 14 described in this embodiment are made of high-pressure hoses and are detachable. The use of high-pressure hoses as the connection material for the fourth pipe 13 and the fifth pipe 14 in this invention can adapt to the relative displacement and vibration between the shell-and-tube heat exchanger 12 and the compressor 4 and evaporator 6, effectively avoiding damage to the pipe connections caused by mechanical stress generated during equipment operation. Simultaneously, the detachable design facilitates equipment installation, commissioning, daily maintenance, and troubleshooting. When cleaning, maintenance, or replacement of the shell-and-tube heat exchanger 12 is required, the fourth pipe 13 and the fifth pipe 14 can be quickly disassembled without large-scale disassembly of the entire system. Moreover, in northern winters when temperatures remain consistently low, the shell-and-tube heat exchanger 12 and its corresponding pipes can be removed and stored, avoiding the occupation of workshop space and preventing damage such as freezing and cracking of the shell-and-tube heat exchanger 12 due to prolonged disuse in low-temperature environments, effectively extending the equipment's service life.
[0024] Furthermore, a fifth solenoid valve 19 is installed on the cold water inlet pipe 17 in this embodiment. In this invention, the fifth solenoid valve 19 can be closed when the shell-and-tube heat exchanger 12 is not exchanging heat, and opened when the shell-and-tube heat exchanger 12 is exchanging heat, thereby avoiding problems such as scaling, corrosion and bacterial growth caused by long-term retention of cold water in the shell-and-tube heat exchanger 12. At the same time, when the shell-and-tube heat exchanger 12 stops operating, the cold water supply is cut off in a timely manner to prevent leakage caused by misoperation or equipment failure, and to ensure the safe and stable operation of the system.
[0025] Furthermore, in this embodiment, the shell-and-tube heat exchanger 12 is mounted on the support 20.
[0026] 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 of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims
1. A device for recovering waste heat from a chiller based on temperature changes, characterized in that: It includes an air-cooled waste heat recovery system and a medium circulation waste heat recovery system. The air-cooled waste heat recovery system is activated when the workshop temperature is ≤10℃ to recover and utilize the waste heat from the use of the chiller (1). The medium circulation waste heat recovery system is activated when the workshop temperature is >10℃ to recover and utilize the waste heat from the use of the chiller (1).
2. The waste heat recovery and utilization device for a chiller based on temperature change according to claim 1, characterized in that: The air-cooled waste heat recovery system includes an air-cooled heat exchanger (2), which is connected to the external environment. The heat exchange inlet of the air-cooled heat exchanger (2) is connected to one end of the first pipeline (3), and the other end of the first pipeline (3) is connected to the outlet of the compressor (4). The inlet of the compressor (4) is connected to one end of the second pipeline (5), and the other end of the second pipeline (5) is connected to the heat exchange outlet of the evaporator (6). The heat exchange inlet of the evaporator (6) is connected to one end of the third pipeline (7), and the other end of the third pipeline (7) is connected to the heat exchange outlet of the air-cooled heat exchanger (2). A first solenoid valve (8) is installed on the first pipeline (3), and a second solenoid valve (9) is installed on the third pipeline (7). The water inlet pipe (10) and the water outlet pipe (11) of the evaporator (6) are connected to the water outlet and water inlet of the cooling system, respectively.
3. The waste heat recovery and utilization device for a chiller based on temperature change according to claim 2, characterized in that: The first solenoid valve (8) and the second solenoid valve (9) can be controlled by the processor to open and close.
4. The waste heat recovery and utilization device for a chiller based on temperature change according to claim 1, characterized in that: The aforementioned medium circulation waste heat recovery system includes a shell-and-tube heat exchanger (12). The heat exchange medium inlet of the shell-and-tube heat exchanger (12) is connected to one end of a fourth pipeline (13), and the other end of the fourth pipeline (13) is connected to the outlet of a compressor (4). The inlet of the compressor (4) is connected to one end of a second pipeline (5), and the other end of the second pipeline (5) is connected to the heat exchange outlet of an evaporator (6). The heat exchange inlet of the evaporator (6) is connected to one end of a fifth pipeline (14). The other end of the fifth pipe (14) is connected to the heat exchange medium outlet of the shell and tube heat exchanger (12). A third solenoid valve (15) is installed on the fourth pipe (13), and a fourth solenoid valve (16) is installed on the fifth pipe (14). The water inlet pipe (10) and water outlet pipe (11) of the evaporator (6) are connected to the water outlet and water inlet of the cooling system, respectively. The bottom of the shell and tube heat exchanger (12) is connected to the cold water inlet pipe (17), and the top of the shell and tube heat exchanger (12) is connected to the hot water outlet pipe (18).
5. A waste heat recovery and utilization device for a chiller based on temperature change according to claim 4, characterized in that: The third solenoid valve (15) and the fourth solenoid valve (16) can be controlled by the processor to open and close.
6. The waste heat recovery and utilization device for a chiller based on temperature change according to claim 4, characterized in that: The fourth pipe (13) and the fifth pipe (14) are made of high-pressure hose and are detachable.
7. A waste heat recovery and utilization device for a chiller based on temperature change according to claim 4, characterized in that: A fifth solenoid valve (19) is installed on the cold water inlet pipe (17).
8. A waste heat recovery and utilization device for a chiller based on temperature change according to claim 4, characterized in that: The shell-and-tube heat exchanger (12) is mounted on a support (20).