CN116086044A - Bathing sewage latent heat secondary recovery unit - Google Patents

Bathing sewage latent heat secondary recovery unit Download PDF

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Publication number
CN116086044A
CN116086044A CN202310066610.0A CN202310066610A CN116086044A CN 116086044 A CN116086044 A CN 116086044A CN 202310066610 A CN202310066610 A CN 202310066610A CN 116086044 A CN116086044 A CN 116086044A
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CN
China
Prior art keywords
heat
sewage
compressor
evaporator
temperature
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Pending
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CN202310066610.0A
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Chinese (zh)
Inventor
高亚民
王丽梅
程世哲
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Shenyang Hong Cheng Shiji Refrigeration Equipment Co ltd
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Shenyang Hong Cheng Shiji Refrigeration Equipment Co ltd
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Priority to CN202310066610.0A priority Critical patent/CN116086044A/en
Publication of CN116086044A publication Critical patent/CN116086044A/en
Pending legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B30/00—Heat pumps
    • F25B30/06—Heat pumps characterised by the source of low potential heat
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B1/00—Compression machines, plants or systems with non-reversible cycle
    • F25B1/10—Compression machines, plants or systems with non-reversible cycle with multi-stage compression
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B27/00—Machines, plants or systems, using particular sources of energy
    • F25B27/02—Machines, plants or systems, using particular sources of energy using waste heat, e.g. from internal-combustion engines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B40/00—Subcoolers, desuperheaters or superheaters
    • F25B40/02—Subcoolers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B43/00—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B49/00—Arrangement or mounting of control or safety devices
    • F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B49/00—Arrangement or mounting of control or safety devices
    • F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
    • F25B49/022—Compressor control arrangements
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/52—Heat recovery pumps, i.e. heat pump based systems or units able to transfer the thermal energy from one area of the premises or part of the facilities to a different one, improving the overall efficiency

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Analytical Chemistry (AREA)
  • Power Engineering (AREA)
  • Heat-Pump Type And Storage Water Heaters (AREA)

Abstract

The invention discloses a bathing sewage latent heat secondary recovery unit, relates to the technical field of sewage heat pumps, and aims to solve the problems that the current equipment has limited heat extraction amount and cannot adjust heat exchange amount according to flow. The invention comprises a first heat pump device, a second heat pump device and a water channel; the first heat pump device comprises a first sewage heat exchanger, a first evaporator, a first compressor, a first condenser and a first expansion valve which are sequentially arranged; the second heat pump device comprises a second sewage heat exchanger, a second evaporator, a second compressor, a second condenser and a second expansion valve which are sequentially arranged; the second compressor is a low-pressure compressor, the second evaporator is a low-temperature evaporator, and the second expansion valve is a low-temperature expansion valve; the first sewage heat exchanger is arranged in the upstream direction of the second sewage heat exchanger; the usage water path passes through the heat absorbing sides of the second condenser and the first condenser in sequence.

Description

Bathing sewage latent heat secondary recovery unit
Technical Field
The invention relates to the technical field of sewage heat pumps, in particular to a bathing sewage latent heat secondary recovery unit.
Background
The bathing sewage can be used as a low-temperature side heat source to be applied to a heat pump water heater unit for heating tap water using side water source water, so that the bathing sewage can be used as clean energy equipment for replacing a coal-fired boiler and an electric boiler, and a higher energy efficiency ratio can be generally obtained during operation, and the COP value is 4.5-6.0 or even higher. The utility model uses the bath sewage in public bath places as a low-temperature heat source, the temperature of the bath sewage is generally 30-35 ℃ higher than the temperature of the ambient air, and the temperature is stable without being influenced by the climate change in four seasons, so the utility model is superior to the air source heat pump water heater.
However, in the practical application process, the number of the bath staff in the bath place is not fixed, namely the required quantity of the used hot water is not stable, and on the other hand, the bath sewage quantity is not balanced in different time periods. In addition, the current equipment has limited heat extraction quantity, and when the amount of the bath sewage is particularly large, the bath sewage cannot be sufficiently heated, and overflows from a sewage tank, so that energy waste is caused. Therefore, the current equipment has the problems that the heat extraction amount is limited and the heat exchange amount cannot be adjusted according to the flow, so that the quality of hot water prepared by the heat pump water heater unit is influenced, the problems of low water temperature or low water quantity and the like frequently occur, and the design requirement cannot be met, so that the problem is to be solved urgently.
Disclosure of Invention
The invention provides a bathing sewage latent heat secondary recovery unit which comprises a first heat pump device, a second heat pump device and a water channel; the first heat pump device comprises a first sewage heat exchanger, a first evaporator, a first compressor, a first condenser and a first expansion valve which are sequentially arranged; the second heat pump device comprises a second sewage heat exchanger, a second evaporator, a second compressor, a second condenser and a second expansion valve which are sequentially arranged; the second compressor is a low-pressure compressor, the second evaporator is a low-temperature evaporator, and the second expansion valve is a low-temperature expansion valve; the first sewage heat exchanger is arranged in the upstream direction of the second sewage heat exchanger; the usage water path passes through the heat absorbing sides of the second condenser and the first condenser in sequence.
The invention is further provided with: the first heat pump device further comprises a first liquid storage gas-liquid separator and a first subcooler, wherein the outlet of the heat absorption side of the first evaporator is connected with the inlet of the first liquid storage gas-liquid separator, the gas phase outlet of the first liquid storage gas-liquid separator is connected with the inlet of the first compressor, the liquid phase outlet of the first liquid storage gas-liquid separator is connected with the inlet of the heat release side of the subcooler, the outlet of the heat release side of the subcooler is connected with the first expansion valve, and the other end of the first expansion valve is connected with the inlet of the heat absorption side of the first evaporator.
The invention is further provided with: the inlet and the outlet of the heat absorbing side of the first subcooler are connected to the water using path, and the first subcooler is arranged in the upstream direction of the first condenser.
The second heat pump device further comprises a second liquid storage gas-liquid separator and a second subcooler, wherein the outlet of the heat absorption side of the second evaporator is connected with the inlet of the second liquid storage gas-liquid separator, the gas phase outlet of the second liquid storage gas-liquid separator is connected with the inlet of the second compressor, the liquid phase outlet of the second liquid storage gas-liquid separator is connected with the inlet of the heat release side of the subcooler, the outlet of the heat release side of the subcooler is connected with the second expansion valve, and the other end of the second expansion valve is connected with the inlet of the heat absorption side of the second evaporator.
The invention is further provided with: the inlet and the outlet of the heat absorbing side of the second subcooler are connected to the water using path, and the second subcooler is arranged in the upstream direction of the second condenser.
The invention is further provided with: the first compressor and the second compressor are variable frequency compressors.
The invention is further provided with: the use water is provided with a flow valve.
The invention is further provided with: further comprises: a first temperature sensor for detecting the temperature T1 of a heat source at a heat release side inlet of the first evaporator; the second temperature sensor is used for detecting the temperature T2 of a heat source at a heat release side inlet of the second evaporator; the third temperature sensor is used for detecting the water inlet temperature T3 of the water using path; the fourth temperature sensor is used for detecting the middle section temperature T4 of the water using path; a fifth temperature sensor for detecting the outlet water temperature T5 of the water using path; the control cabinet is electrically connected with the first temperature sensor, the second temperature sensor, the third temperature sensor, the fourth temperature sensor and the fifth temperature sensor; the control cabinet controls the frequency of the second compressor according to the values of T2, T3 and T4 and the flow regulated by the flow valve, and controls the frequency of the first compressor according to the values of T1, T4 and T5 and the flow regulated by the flow valve.
The beneficial effects of the invention are as follows: the frequency of the first compressor and the frequency of the second compressor can be adjusted, and the second heat pump device can further excavate the heat in the low-temperature bath sewage, so that the whole unit obtains more heat from the bath sewage, and the outlet water temperature can reach the standard under the condition of ensuring the water flow; the water flow rate can be made sufficient while maintaining the supply water temperature. The use requirements of customers can be met from the two design indexes. Furthermore, the water outlet temperature and the water outlet flow of the water channel can be adjusted at will. When the heat extracted from the bath sewage is abundant and the water flow meets the use requirement, the frequency of the first compressor and the second compressor can be regulated down to reduce the energy consumption.
Because the secondary recovery unit utilizing the latent heat of the bathing sewage, namely the sensible heat of the bathing sewage extracted by the first heat source and the sensible heat and the latent heat of the bathing sewage extracted by the second heat source, the needed low-temperature heat source for preparing high-temperature water by the unit is far greater than that of a unit with only sensible heat recovery, the total energy ratio of the heat energy of waste heat recovery in the unit is higher, and the energy efficiency ratio of the whole unit is higher.
Drawings
Fig. 1 is a schematic diagram of the present invention.
Reference numerals: 11. a first sewage heat exchanger; 12. a first evaporator; 13. a first liquid-storage gas-liquid separator; 14. a first subcooler; 15. a first expansion valve; 16. a first compressor; 17. a first condenser; 18. a first heat source circulation pump;
21. a second sewage heat exchanger; 22. a second evaporator; 23. a second liquid-storage gas-liquid separator; 24. a second subcooler; 25. a second expansion valve; 26. a second compressor; 27. a second condenser; 28. a second heat source circulation pump;
3. a waterway is used; 4. a flow valve;
51. a first temperature sensor; 52. a second temperature sensor; 53. a third temperature sensor; 54. a fourth temperature sensor; 55. and a fifth temperature sensor.
Detailed Description
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are merely for explaining the technical principles of the present invention, and are not intended to limit the scope of the present invention.
References to "connected," unless specifically emphasized, refer to conventional prior art means of connecting via tubing.
Referring to fig. 1, the invention provides a bathing sewage latent heat secondary recovery unit, which comprises a first heat pump device, a second heat pump device and a using water path 3.
The first heat pump apparatus includes a first sewage heat exchanger 11, a first evaporator 12, a first liquid-storage gas-liquid separator 13, a first subcooler 14, a first expansion valve 15, a first compressor 16, a first condenser 17, and a first heat source circulation pump 18.
The inlet and outlet of the first sewage heat exchanger 11 are connected with the outlet and inlet of the heat release side of the first evaporator 12 through a first pipeline, a first heat source circulating pump 18 is arranged on the first pipeline, and the first heat source circulating pump 18 works to enable the heat source in the first pipeline to circulate, so that the heat source absorbs heat from the bath sewage and releases heat to the refrigerant at the first evaporator 12 at the first sewage heat exchanger 11, the cooled heat source returns to the first sewage heat exchanger 11 to absorb heat of the bath sewage again to raise the temperature, and the circulation flows in this way to finish the heat extraction of the bath sewage.
The outlet of the heat absorbing side of the first evaporator 12 is connected with the first liquid-storage gas-liquid separator 13, and the first liquid-storage gas-liquid separator 13 has the following functions: the gas phase part of the refrigerant absorbs heat to become overheated gas with higher temperature, and the liquid phase part of the refrigerant absorbs heat to become low-temperature liquid with lower temperature. The liquid phase outlet of the first liquid-storage gas-liquid separator 13 is connected with the inlet of the heat release side of the first subcooler 14, and the gas phase outlet of the first liquid-storage gas-liquid separator 13 is connected with the inlet of the first compressor 16.
The outlet of the heat release side of the first subcooler 14 is connected to the first expansion valve 15, and the other end of the first expansion valve 15 is connected to the inlet of the heat release side of the first evaporator 12, thereby realizing the circulation heat absorption of the refrigerant at the first evaporator 12.
The outlet of the first compressor 16 is connected to the inlet of the heat release side of the first condenser 17, and the outlet of the heat release side of the first condenser 17 is connected to the first liquid-storage gas-liquid separator 13. The process is that the first compressor 16 compresses the superheated gas separated by the first liquid-storage gas-liquid separator 13 into high-temperature and high-pressure gas, and then at the first condenser 17, the high-temperature and high-pressure gas undergoes a phase change and emits a large amount of sensible heat and latent heat, which is absorbed by the use water in the use water path 3 and warmed. At the same time of releasing heat, the refrigerant is condensed into liquid, then the part of the refrigerant liquid returns to the liquid-storage gas-liquid separator and circulates along with the liquid phase part in the liquid-storage gas-liquid separator, after releasing heat again, the refrigerant liquid is throttled and depressurized into low-temperature low-pressure refrigerant liquid through the first expansion valve 15, and then enters the first evaporator 12 to complete the refrigeration cycle of the first heat pump device.
The second heat pump device comprises a second sewage heat exchanger 21, a second evaporator 22, a second liquid storage gas-liquid separator 23, a second subcooler 24, a second expansion valve 25, a second compressor 26, a second condenser 27 and a second heat source water pump.
The inlet and outlet of the second sewage heat exchanger 21 are connected with the outlet and inlet of the heat release side of the second evaporator 22 through a second pipeline, a second heat source circulating pump 28 is arranged on the second pipeline, and the second heat source circulating pump 28 works to enable the heat source in the second pipeline to circulate, so that the heat source absorbs heat from the bath sewage and releases heat to the refrigerant at the second evaporator 22 at the second sewage heat exchanger 21, the cooled heat source returns to the second sewage heat exchanger 21 to absorb heat of the bath sewage again to heat up, and the circulation flow is performed in such a way to finish the heat extraction of the bath sewage, namely the secondary recovery of the waste heat of the bath sewage.
The outlet of the heat absorbing side of the second evaporator 22 is connected with a second liquid-storage gas-liquid separator 23, and the second liquid-storage gas-liquid separator 23 has the functions of: the gas phase part of the refrigerant absorbs heat to become overheated gas with higher temperature, and the liquid phase part of the refrigerant absorbs heat to become low-temperature liquid with lower temperature. The liquid phase outlet of the second liquid-storage gas-liquid separator 23 is connected to the inlet of the heat release side of the second subcooler 24, and the gas phase outlet of the second liquid-storage gas-liquid separator 23 is connected to the inlet of the second compressor 26.
The outlet of the heat release side of the second subcooler 24 is connected to the second expansion valve 25, and the other end of the second expansion valve 25 is connected to the inlet of the heat release side of the second evaporator 22, thereby realizing the circulation heat absorption of the refrigerant at the second evaporator 22.
The outlet of the second compressor 26 is connected to the inlet of the heat release side of the second condenser 27, and the outlet of the heat release side of the second condenser 27 is connected to the second liquid-storage gas-liquid separator 23. The process is that the second compressor 26 compresses the superheated gas separated by the second liquid-storage gas-liquid separator 23 into high-temperature and high-pressure gas, and then at the second condenser 27, the high-temperature and high-pressure gas undergoes a phase change and emits a large amount of sensible heat and latent heat, which is absorbed by the use water in the use water circuit 3 and warmed. At the same time of releasing heat, the refrigerant is condensed into liquid, then the part of the refrigerant liquid returns to the liquid-storage gas-liquid separator and circulates along with the liquid phase part in the liquid-storage gas-liquid separator, after releasing heat again, the refrigerant liquid is throttled and depressurized into low-temperature low-pressure refrigerant liquid through the second expansion valve 25, and then enters the second evaporator 22, thus completing the refrigeration cycle of the second heat pump device.
The water path 3 is used to connect the inlet and outlet of the heat absorbing side of the second subcooler 24, the inlet and outlet of the heat absorbing side of the second condenser 27, the inlet and outlet of the heat absorbing side of the first subcooler 14, and the inlet and outlet of the heat absorbing side of the first condenser 17 in order. In the process of flowing through the water, the temperature is raised by absorbing the heat released by the refrigerant, so that the water reaches the temperature requirement of water outlet. A flow valve 4 is also provided in the usage water path 3 for controlling the flow rate of the usage water.
The first subcooler 14 and the second subcooler 24 are provided to further release heat from the refrigerant, thereby reducing the temperature of the refrigerant before the first expansion valve 15 and the second expansion valve 25 and increasing the cooling capacity of the entire apparatus; on the other hand, the water to be used is preheated, so that the water outlet temperature of the water to be used can be effectively increased.
The scheme also comprises a control cabinet, a first temperature sensor 51, a second temperature sensor 52, a third temperature sensor 53, a fourth temperature sensor 54 and a fifth temperature sensor.
The first temperature sensor 51 is disposed on the first pipeline, and is configured to detect a temperature T1 of the heat source at the inlet of the heat release side of the first evaporator 12; the second temperature sensor 52 is disposed on the second pipeline, and is configured to detect a temperature T2 of the heat source at the inlet of the heat release side of the second evaporator 22; the third temperature sensor 53 is disposed on the usage water path 3 and located in an upstream direction of the second subcooler 24, for detecting a water intake temperature T3 of the usage water path 3; the fourth temperature sensor 54 is disposed on the service water and located between the second condenser 27 and the first subcooler 14, and is used for detecting the middle temperature T4 of the service water path 3, and can be used for measuring the heat exchange condition of the second subcooler 24 and the second condenser 27; a fifth temperature sensor is provided on the usage water path 3 and located in the downstream direction of the first condenser 17 for detecting the outlet water temperature T5 of the usage water path 3.
The control cabinet is electrically connected to the first temperature sensor 51, the second temperature sensor 52, the third temperature sensor 53, the fourth temperature sensor 54, the fifth temperature sensor, the flow valve 4, the first compressor 16 and the second compressor 26.
In addition, the first compressor 16 and the second compressor 26 are both variable frequency compressors.
The regulation and control process is specifically as follows: the flow valve 4 is controlled according to the use requirement to adjust the flow of the use water. The frequency of the second compressor 26 is controlled according to the values of T2, T3 and T4 and the flow rate regulated by the flow valve 4, and the values of the pressure and the like associated with the second compressor 26 in the second heat pump device can be referred to in the control process. The frequency of the first compressor is controlled according to the values of T1, T4 and T5 and the flow regulated by the flow valve 4, and the values of the pressure and the like associated with the first compressor 16 in the first heat pump device can be referenced in the control process. The control cabinet can completely depend on the existing control program, and no improvement on the program is involved.
In addition, in the bath sewage tank, the first sewage heat exchanger 11 is located in the upstream direction of the second sewage heat exchanger, so that the second sewage heat exchanger 21 performs heat extraction in a relatively low-temperature bath sewage environment. Meanwhile, the second compressor 26 is a low-pressure compressor, the second expansion valve 25 is a low-temperature expansion valve, the second evaporator 22 is a low-temperature evaporator, the evaporation temperature of the second evaporator 22 is lower than the evaporation temperature of the first evaporator 12, and the second heat source temperature is lower than the first heat source temperature. When the unit operates to reach that the temperature T2 of the heat source at the inlet of the heat release side of the second evaporator 22 is lower than the temperature T1 of the heat source at the inlet of the heat release side of the first evaporator 12, the temperature of the bath sewage after the second heat extraction is lower than the temperature of the bath sewage after the first heat extraction through gradient cooling, and in a certain controllable scientific range, the lower the temperature of the T2 is, the lower the temperature of the bath sewage discharged to municipal administration is, the more low-temperature heat source energy is brought to the unit, and the waste of waste heat energy is reduced.
The first sewage heat exchanger 11 and the second sewage heat exchanger 21 both adopt silicon carbide radiators to improve corrosion resistance and heat exchange efficiency.
The frequencies of the first compressor 16 and the second compressor 26 can be adjusted, and the second heat pump device can further excavate the heat in the low-temperature bath sewage, so that the whole unit obtains more heat from the bath sewage, and the outlet water temperature can reach the standard under the condition of ensuring the water flow; the water flow rate can be made sufficient while maintaining the supply water temperature. The use requirements of customers can be met from the two design indexes. Furthermore, the water outlet temperature and the water outlet flow rate of the water can be adjusted at will. The frequency of the first compressor 16 and the second compressor 26 may also be tuned down to reduce energy consumption when the extracted heat is abundant and the water flow meets the use requirements.
While the invention has been described with reference to a preferred embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention, and in particular, the technical features set forth in the various embodiments may be combined in any manner so long as there is no structural conflict. The present invention is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions falling within the scope of the claims.
In the description of the present invention, terms such as "center", "upper", "lower", "left", "right", "numerical", "horizontal", "inner", "outer", and the like, which indicate a direction or a positional relationship, are based on the direction or the positional relationship shown in the drawings, are merely for convenience of description, and do not indicate or imply that the apparatus or elements must have a specific orientation, be constructed and operated in a specific orientation, and thus are not to be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
The terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, article, or apparatus/means that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, article, or apparatus/means.
Thus far, the technical solution of the present invention has been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of protection of the present invention is not limited to these specific embodiments. Equivalent modifications and substitutions for related technical features may be made by those skilled in the art without departing from the principles of the present invention, and such modifications and substitutions will fall within the scope of the present invention.

Claims (8)

1. The bathing sewage latent heat secondary recovery unit is characterized by comprising a first heat pump device, a second heat pump device and a using water path (3);
the first heat pump device comprises a first sewage heat exchanger (11), and a first evaporator (12), a first compressor (16), a first condenser (17) and a first expansion valve (15) which are arranged in sequence;
the second heat pump device comprises a second sewage heat exchanger (21), and a second evaporator (22), a second compressor (26), a second condenser (27) and a second expansion valve (25) which are arranged in sequence;
the second compressor (26) is a low-pressure compressor, the second evaporator (22) is a low-temperature evaporator, and the second expansion valve (25) is a low-temperature expansion valve;
the first sewage heat exchanger (11) is arranged in the upstream direction of the second sewage heat exchanger (21);
the water path (3) passes through the second condenser (27) and the heat absorption side of the first condenser (17) in sequence.
2. The bathing sewage latent heat secondary recovery unit according to claim 1, wherein: the first heat pump device further comprises a first liquid storage gas-liquid separator (13) and a first subcooler (14), a heat absorption side outlet of the first evaporator (12) is connected with an inlet of the first liquid storage gas-liquid separator (13), a gas phase outlet of the first liquid storage gas-liquid separator (13) is connected with an inlet of the first compressor (16), a liquid phase outlet of the first liquid storage gas-liquid separator (13) is connected with a heat emission side inlet of the first subcooler (14), a heat emission side outlet of the first subcooler (14) is connected with the first expansion valve (15), and the other end of the first expansion valve (15) is connected with an inlet of a heat absorption side of the first evaporator (12).
3. The bathing sewage latent heat secondary recovery unit according to claim 2, wherein: the inlet and outlet of the heat absorbing side of the first subcooler (14) are connected to the water using path (3), and the first subcooler (14) is arranged in the upstream direction of the first condenser (17).
4. The bathing sewage latent heat secondary recovery unit according to claim 1, wherein: the second heat pump device further comprises a second liquid storage gas-liquid separator (23) and a second subcooler (24), wherein a heat absorption side outlet of the second evaporator (22) is connected with an inlet of the second liquid storage gas-liquid separator (23), a gas phase outlet of the second liquid storage gas-liquid separator (23) is connected with an inlet of the second compressor (26), a liquid phase outlet of the second liquid storage gas-liquid separator (23) is connected with a heat release side inlet of the second subcooler (24), a heat release side outlet of the second subcooler (24) is connected with a second expansion valve (25), and the other end of the second expansion valve (25) is connected with an inlet of the heat absorption side of the second evaporator (22).
5. The bathing sewage latent heat secondary recovery unit according to claim 4, wherein: the inlet and the outlet of the heat absorbing side of the second subcooler (24) are connected to the water using path (3), and the second subcooler (24) is arranged in the upstream direction of the second condenser (27).
6. The bathing sewage latent heat secondary recovery unit according to claim 1, wherein: the first compressor (16) and the second compressor (26) are both variable frequency compressors.
7. The bathing sewage latent heat secondary recovery unit according to claim 6, wherein a flow valve (4) is arranged on the water using path (3).
8. The bathing sewage latent heat secondary recovery unit according to claim 7, further comprising:
a first temperature sensor (51) for detecting the temperature T1 of a heat source at a heat release side inlet of the first evaporator (12);
a second temperature sensor (52) for detecting a temperature T2 of a heat source at a discharge-side inlet of the second evaporator (22);
a third temperature sensor (53) for detecting the water intake temperature T3 of the water use path (3);
a fourth temperature sensor (54) for detecting the middle temperature T4 of the water circuit (3);
a fifth temperature sensor for detecting the outlet water temperature T5 of the water circuit (3);
the control cabinet is electrically connected with the first temperature sensor (51), the second temperature sensor (52), the third temperature sensor (53), the fourth temperature sensor (54) and the fifth temperature sensor;
the control cabinet controls the frequency of the second compressor (26) according to the values of T2, T3 and T4 and the flow regulated by the flow valve (4), and controls the frequency of the first compressor according to the values of T1, T4 and T5 and the flow regulated by the flow valve (4).
CN202310066610.0A 2023-01-20 2023-01-20 Bathing sewage latent heat secondary recovery unit Pending CN116086044A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202310066610.0A CN116086044A (en) 2023-01-20 2023-01-20 Bathing sewage latent heat secondary recovery unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202310066610.0A CN116086044A (en) 2023-01-20 2023-01-20 Bathing sewage latent heat secondary recovery unit

Publications (1)

Publication Number Publication Date
CN116086044A true CN116086044A (en) 2023-05-09

Family

ID=86204158

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202310066610.0A Pending CN116086044A (en) 2023-01-20 2023-01-20 Bathing sewage latent heat secondary recovery unit

Country Status (1)

Country Link
CN (1) CN116086044A (en)

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