CN115264690B - Bypass heat exchange structure, four-pipe heating recovery system, air conditioning unit and control method - Google Patents
Bypass heat exchange structure, four-pipe heating recovery system, air conditioning unit and control method Download PDFInfo
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- CN115264690B CN115264690B CN202210867509.0A CN202210867509A CN115264690B CN 115264690 B CN115264690 B CN 115264690B CN 202210867509 A CN202210867509 A CN 202210867509A CN 115264690 B CN115264690 B CN 115264690B
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- 238000011084 recovery Methods 0.000 title claims abstract description 54
- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000004378 air conditioning Methods 0.000 title claims abstract description 21
- 238000010438 heat treatment Methods 0.000 title claims description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 422
- 230000001105 regulatory effect Effects 0.000 claims abstract description 43
- 230000001276 controlling effect Effects 0.000 claims description 43
- 230000005855 radiation Effects 0.000 claims description 25
- 239000007788 liquid Substances 0.000 claims description 24
- 239000003507 refrigerant Substances 0.000 claims description 14
- 230000017525 heat dissipation Effects 0.000 claims description 10
- 230000001932 seasonal effect Effects 0.000 claims description 10
- 238000001816 cooling Methods 0.000 description 5
- 238000004891 communication Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000033228 biological regulation Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 201000010099 disease Diseases 0.000 description 2
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 2
- 239000008236 heating water Substances 0.000 description 2
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 238000003303 reheating Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000010977 unit operation Methods 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
- F24F5/0007—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater cooling apparatus specially adapted for use in air-conditioning
- F24F5/001—Compression cycle type
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D19/00—Details
- F24D19/10—Arrangement or mounting of control or safety devices
- F24D19/1006—Arrangement or mounting of control or safety devices for water heating systems
- F24D19/1009—Arrangement or mounting of control or safety devices for water heating systems for central heating
- F24D19/1039—Arrangement or mounting of control or safety devices for water heating systems for central heating the system uses a heat pump
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D3/00—Hot-water central heating systems
- F24D3/18—Hot-water central heating systems using heat pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/65—Electronic processing for selecting an operating mode
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/81—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the air supply to heat-exchangers or bypass channels
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
- F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/86—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling compressors within refrigeration or heat pump circuits
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/88—Electrical aspects, e.g. circuits
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F12/00—Use of energy recovery systems in air conditioning, ventilation or screening
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Signal Processing (AREA)
- Thermal Sciences (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Sustainable Development (AREA)
- Life Sciences & Earth Sciences (AREA)
- Steam Or Hot-Water Central Heating Systems (AREA)
Abstract
The invention relates to a bypass heat exchange structure, a four-pipe heat recovery system, an air conditioning unit and a control method, belongs to the technical field of heat exchange equipment, and solves the technical problem that the heat recovery amount of the four-pipe heat recovery unit is difficult to adjust in the prior art. The bypass heat exchange structure comprises a bypass heat exchange part and a bypass pipeline assembly, wherein the bypass heat exchange part can be communicated with a hot water supply and return pipeline assembly of the air conditioning unit through the bypass pipeline assembly; the bypass pipeline component is provided with a flow control part and a reversing part, and the bypass heat exchange structure can be communicated with the hot water supply pipeline or the hot water return pipeline through the reversing part. The invention can regulate and control the heat recovery amount according to the needs, thereby meeting the heat recovery requirements in different environments, flexibly regulating the outlet water temperature and ensuring the use reliability.
Description
Technical Field
The invention relates to the technical field of heat exchange equipment, in particular to a bypass heat exchange structure, a four-pipe heating recovery system, an air conditioning unit and a control method.
Background
Hospitals are an indispensable part of our daily life, the trouble of encountering various diseases and magic diseases needs to go to the hospitals in time, a clean operating room is a very critical room for the hospitals, and patients need to be treated by operations of various sizes, wherein the clean operating room has very high requirements on the air in the clean operating room, and the air flow organization of the air is very critical. The clean operating room of the hospital has the requirement of simultaneously cooling and heating throughout the year, so the four-tube refrigerating and heating water host is widely applied to hospitals, and the refrigerating capacity and the heating capacity of the four-tube refrigerating and heating water host can be independently regulated according to the requirement of the end load.
The four-pipe heat recovery control system is a control scheme for continuously adjusting the temperature of hot water without an energy storage water tank and simultaneously providing a stable cold source and a stable heat source in a purified air conditioner refrigerating mode when an air-cooled cold water (heat pump) four-pipe heat recovery unit is used as a reheating constant heat source in refrigerating operation, but the four-pipe heat recovery unit at the present stage can not achieve a self-adaptive heat recovery effect due to the circulation of an internal fluorine system, can only perform unit development according to design value parameters at the initial stage of a project, has the phenomenon of difficult adjustment of heat recovery amount in the actual use process, and can not achieve continuous adjustment of the temperature of heat recovery water outlet.
Disclosure of Invention
In view of the above, the present invention aims to provide a bypass heat exchange structure, a four-pipe heat recovery system, an air conditioning unit and a control method, so as to solve the technical problem of difficult adjustment of heat recovery amount of the four-pipe heat recovery unit in the prior art.
In order to achieve the above purpose, the present invention provides the following technical solutions:
According to a first aspect of an embodiment of the present invention, there is provided a bypass heat exchange structure, including a bypass heat exchange portion and a bypass line assembly, wherein the bypass heat exchange portion is capable of communicating with a hot water supply and return line assembly of an air conditioning unit through the bypass line assembly; the bypass pipeline assembly is provided with a flow control part and a reversing part, and the bypass heat exchange structure can be communicated with a hot water supply pipeline or a hot water return pipeline through the reversing part.
Further, the bypass pipeline assembly comprises a bypass main pipe and bypass branch pipes, the two ends of the bypass heat exchange part are respectively provided with the bypass main pipe, one of the bypass main pipes is provided with the flow control part, each bypass main pipe is respectively provided with the bypass branch pipe communicated with the hot water supply pipeline and the hot water return pipeline, and a reversing part is arranged between the bypass main pipe and the corresponding bypass branch pipe.
Further, the bypass heat exchange part and the fin condenser inside the air conditioning unit are arranged in parallel, and the axes of the bypass heat exchange part and the fin condenser are perpendicular to the horizontal plane.
Further, the bypass heat exchange part is a bypass fin type heat exchanger, and the bypass fin type heat exchanger and a fin condenser in the air conditioning unit are positioned at the same horizontal position.
Further, the flow control part is a bypass regulating valve, and the reversing part is a three-way valve.
According to a second aspect of the embodiment of the invention, a four-pipe heating recovery system is provided, which comprises a refrigerant system, a water circulation heat exchange system and the bypass heat exchange structure, wherein the bypass heat exchange structure is connected to the water circulation heat exchange system, and the refrigerant system and the water circulation heat exchange system form heat exchange.
Further, the refrigerant system comprises a first compressor, a second compressor, a fin condenser, a shell-and-tube evaporator and a heat radiation fan, wherein the first compressor and the second compressor are arranged in parallel; the inlets of the fin condenser and the shell-and-tube condenser are communicated with the outlets of the first compressor and the second compressor; the outlets of the fin condenser and the shell-and-tube condenser are communicated with the inlet of the shell-and-tube evaporator; the inlets of the first compressor and the second compressor are communicated with the outlet of the shell-and-tube evaporator.
Further, the water circulation heat exchange system comprises a hot water supply and return pipeline component and a cold water supply and return pipeline component, the hot water supply and return pipeline component is arranged between the shell-and-tube condenser and the tail end heat utilization equipment, the cold water supply and return pipeline component is arranged between the shell-and-tube evaporator and the tail end heat utilization equipment, and the hot water supply and return pipeline component is connected with the bypass heat exchange structure.
Further, the hot water supply and return pipeline assembly comprises a hot water supply pipeline and a hot water return pipeline, the hot water supply pipeline and the hot water return pipeline are respectively arranged between the shell-and-tube condenser and the tail end heat utilization equipment, and the hot water supply pipeline and the hot water return pipeline are both connected with the bypass heat exchange structure.
Further, a first bypass main pipe and a second bypass main pipe are arranged on the bypass heat exchange part, the flow control part is arranged on the first bypass main pipe or the second bypass main pipe, and two bypass branch pipes connected with the hot water supply pipeline and the hot water return pipeline are respectively arranged on the first bypass main pipe and the second bypass main pipe.
Further, a first water return bypass branch pipe connected with the hot water return pipeline and a first water supply bypass branch pipe connected with the hot water supply pipeline are arranged on the first bypass main pipe, a second water return bypass branch pipe connected with the hot water return pipeline and a second water supply bypass branch pipe connected with the hot water supply pipeline are arranged on the second bypass main pipe, a water supply regulating valve is arranged on the hot water supply pipeline between the first water supply bypass branch pipe and the second water supply bypass branch pipe, and a water return regulating valve is arranged on the hot water return pipeline between the first water return bypass branch pipe and the second water return bypass branch pipe.
Further, the hot water supply and return pipeline assembly further comprises a water supply inlet temperature sensor arranged at the inlet of the first water supply bypass branch pipe, and a water supply outlet temperature sensor arranged at the outlet of the second water supply bypass branch pipe, and the water supply inlet temperature sensor and the water supply outlet temperature sensor are both arranged on the hot water supply pipeline.
Further, the hot water supply and return pipeline assembly further comprises a return water inlet temperature sensor arranged at the inlet of the second return water bypass branch pipe, and a return water outlet temperature sensor arranged at the outlet of the first return water bypass branch pipe, and the return water inlet temperature sensor and the return water outlet temperature sensor are both arranged on the hot water return pipeline.
According to a third aspect of the embodiment of the invention, an air conditioning unit is provided, which comprises the four-pipe heating recovery system.
Further, the air conditioning unit further comprises a shell, the refrigerant system and the bypass heat exchange part are both arranged in the shell, and the water circulation heat exchange system is arranged outside the shell.
According to a fourth aspect of the embodiment of the present invention, there is provided a control method of a four-pipe heat recovery system for controlling the four-pipe heat recovery system, including the steps of:
acquiring the inlet water temperature at the inlet of the bypass heat exchange structure;
comparing the inlet water temperature with a preset outlet water temperature;
And controlling at least one of the liquid flow of the bypass pipeline assembly, the water supply flow of the hot water supply pipeline or the hot water return pipeline and the rotating speed of the fan according to the comparison result.
Further, be provided with the water supply governing valve on the hot water delivery pipe, be provided with the return water governing valve on the hot water return pipe, the water supply governing valve with the both ends of return water governing valve all connect in parallel have bypass heat exchange structure, the water supply governing valve is used for adjusting the water supply flow in the hot water supply pipe, the return water governing valve is used for adjusting the water supply flow in the hot water return pipe, flow control portion is used for adjusting the liquid flow of bypass pipeline subassembly.
Further, the controlling the liquid flow of the bypass pipeline assembly, the water supply flow in the hot water supply pipeline or the hot water return pipeline and the fan rotating speed according to the acquired size relationship includes:
judging whether the inlet water temperature is higher than the preset outlet water temperature;
If yes, controlling the liquid flow of the bypass pipeline assembly to be increased, controlling the water supply flow in the hot water supply pipeline or the hot water return pipeline to be reduced, and controlling the heat dissipation fan to run at a set initial rotation speed;
in the control process, judging whether the outlet water temperature of the bypass heat exchange structure is equal to the preset outlet water temperature;
if not, after controlling the liquid flow of the bypass pipeline assembly to be increased to the maximum value, controlling a valve on a hot water supply pipeline or a hot water return pipeline to be closed, and controlling the rotating speed of the heat radiation fan to be continuously increased until the outlet water temperature is equal to the preset outlet water temperature.
Further, when the rotation speed of the heat radiation fan is controlled to be continuously increased until the water temperature of the outlet is equal to the preset water outlet temperature, the liquid flow of the bypass pipeline assembly, the water supply flow in the hot water supply pipeline or the hot water return pipeline and the rotation speed of the heat radiation fan are kept unchanged;
After the water pump operates for a certain time, judging whether the outlet water temperature is smaller than the preset outlet water temperature;
If yes, controlling the rotating speed of the heat radiation fan to be reduced until the outlet water temperature is equal to the preset outlet water temperature.
Further, regarding the controlling of the rotation speed of the heat dissipation fan to decrease until the outlet water temperature is equal to the preset outlet water temperature, the method includes the following steps:
controlling the rotating speed of the heat radiation fan to continuously reduce to a set initial rotating speed;
judging whether the outlet water temperature is equal to the preset outlet water temperature;
If not, controlling the liquid flow of the bypass pipeline assembly to be reduced, and adjusting the water supply flow in the hot water supply pipeline or the hot water return pipeline to be increased until the outlet water temperature is equal to the preset outlet water temperature.
Further, before the obtaining the inlet water temperature at the inlet of the bypass heat exchange structure, the method further comprises:
Acquiring a seasonal operation mode;
and controlling the bypass heat exchange structure to be communicated with a hot water supply pipeline or a hot water return pipeline according to the acquired seasonal operation mode.
Further, the seasonal operation mode includes a summer operation mode and a winter operation mode, wherein:
When the summer operation mode is acquired, the bypass heat exchange structure is controlled to be communicated with the hot water supply pipeline;
When the winter operation mode is acquired, the bypass heat exchange structure is controlled to be communicated with the hot water return pipeline.
According to the bypass heat exchange structure provided by the invention, the communication with the hot water supply pipeline or the hot water return pipeline can be realized through the reversing part according to the seasonal characteristics, and the liquid flow in the bypass pipeline assembly can be regulated through the flow control part, so that the heat recovery amount can be flexibly regulated and controlled, the heat recovery requirements of a better surface under different environments can be met, and the running stability and the self-adaption of a unit are ensured.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a four-pipe heat recovery system according to an embodiment of the present invention;
FIG. 2 is a schematic flow chart of a control method of a four-pipe heat recovery system according to an embodiment of the present invention;
FIG. 3 is a control logic schematic of a four-tube heat recovery system in summer according to an embodiment of the present invention.
In the figure: 1. a bypass heat exchange part; 2. a heat radiation fan; 3. a flow rate control unit; 4. a reversing section; 5. a first bypass main pipe; 6. a second bypass main pipe; 7. a first return water bypass branch pipe; 8. a first water supply bypass branch pipe; 9. a second return water bypass branch pipe; 10. a second water supply bypass branch pipe; 11. a first compressor; 12. a second compressor; 13. a fin condenser; 14. a shell-and-tube condenser; 15. a shell and tube evaporator; 16. a thermal device is used at the tail end; 17. the tail end is used as a cooling device; 18. a hot water supply line; 19. a hot water return line; 20. a cold water supply line; 21. a cold water return line; 22. a water supply inlet temperature sensor; 23. a water supply outlet temperature sensor; 24. a backwater inlet temperature sensor; 25. a backwater outlet temperature sensor; 26. a water supply regulating valve; 27. a water return regulating valve.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. All other embodiments, based on the examples herein, which are within the scope of the invention as defined by the claims, will be within the scope of the invention as defined by the claims.
The invention provides a bypass heat exchange structure, which comprises a bypass heat exchange part 1 and a bypass pipeline assembly, wherein the bypass heat exchange part 1 is arranged below a heat radiation fan 2 of an air conditioning unit and can be communicated with a hot water supply and return pipeline assembly of the air conditioning unit through the bypass pipeline assembly; the bypass pipeline assembly is provided with a flow control part 3 and a reversing part 4, and the bypass heat exchange structure can be communicated with the hot water supply pipeline 18 or the hot water return pipeline 19 through the reversing part 4 according to the seasonal characteristics. When the outdoor temperature in summer is high, the reversing part 4 can adjust the pipeline so that the bypass pipeline assembly is connected with the hot water supply pipeline 18, and when the outdoor temperature in winter is low, the reversing part 4 can adjust the pipeline so that the bypass pipeline is connected with the hot water return pipeline 19. And this bypass heat transfer structure can adjust the liquid flow in the bypass line subassembly through flow control portion 3 to can nimble regulation and control heat recovery volume, the heat recovery demand under the different environment of face that can be better, thereby guarantee the stability and the adaptivity of unit operation.
In this embodiment, the bypass pipeline assembly includes a bypass main pipe and bypass branch pipes, two ends of the bypass heat exchange portion 1 are respectively provided with a bypass main pipe, one of the bypass main pipes is provided with a flow control portion 3, each bypass main pipe is respectively provided with a bypass branch pipe communicated with the hot water supply pipeline 18 and the hot water return pipeline 19, and a reversing portion 4 is provided between the bypass main pipe and the corresponding bypass branch pipe.
Specifically, the bypass heat exchange portion 1 is provided with a first bypass main pipe 5 and a second bypass main pipe 6, the first bypass main pipe 5 is provided with a first backwater bypass branch pipe 7 and a first water supply bypass branch pipe 8, the second bypass main pipe 6 is provided with a second backwater bypass branch pipe 9 and a second water supply bypass branch pipe 10, the first water supply bypass branch pipe 8 and the second water supply bypass branch pipe 10 are both arranged on the hot water supply pipeline 18, the first backwater bypass branch pipe 7 and the second backwater bypass branch pipe 9 are both arranged on the hot water return pipeline 19, the reversing portion 4 is arranged among the first bypass main pipe 5, the first backwater bypass branch pipe 7 and the first water supply bypass branch pipe 8, and among the second bypass main pipe 6, the second backwater bypass branch pipe 9 and the second water supply bypass branch pipe 10, the reversing portion 4 adopts a three-way valve for realizing the communication of the bypass heat exchange structure with the hot water supply pipeline 18 or the hot water return pipeline 19. The first bypass main pipe 5 or the second bypass main pipe 6 is provided with a flow control portion 3, and the flow control portion 3 may be a bypass adjusting valve, and the opening of the bypass adjusting valve is adjusted to adjust the flow rate of the liquid entering the bypass line assembly.
In addition, the bypass heat exchange portion 1 and the fin condenser 13 inside the air conditioning unit are arranged in parallel, the axes of the bypass heat exchange portion 1 and the fin condenser 13 are perpendicular to the horizontal plane, the heat dissipation fan 2 is arranged above the bypass heat exchange portion 1 and the fin condenser 13, the air flow direction inside the air conditioning unit shell passes through the fin condenser 13 and the bypass heat exchange portion 1, then the air is mixed in the middle of the unit and blown out by the heat dissipation fan 2, the blown hot wind energy dissipates heat to the high altitude through buoyancy, and therefore the temperature of the fin condenser 13 and the return air of the bypass heat exchange portion 1 can achieve a better effect.
In this embodiment, the bypass heat exchange portion 1 is a bypass fin type heat exchanger, and in order to better realize uniform heat exchange, preferably, the bypass fin type heat exchanger and the fin condenser 13 inside the air conditioning unit are arranged at the same horizontal position, so as to improve the heat exchange effect as much as possible.
The invention also provides a four-pipe heating recovery system, which is shown in figure 1 and comprises a refrigerant system, a water circulation heat exchange system and the bypass heat exchange structure provided by the invention, wherein the bypass heat exchange structure is connected to the water circulation heat exchange system, and the refrigerant system and the water circulation heat exchange system form heat exchange.
The refrigerant system comprises a first compressor 11, a second compressor 12, a fin condenser 13, a shell-and-tube condenser 14, a shell-and-tube evaporator 15 and a heat radiation fan 2, wherein the first compressor 11 and the second compressor 12 are arranged in parallel; the inlets of the fin condenser 13 and the shell-and-tube condenser 14 are communicated with the outlets of the first compressor 11 and the second compressor 12; the outlets of the fin condenser 13 and the shell-and-tube condenser 14 are communicated with the inlet of the shell-and-tube evaporator 15; the inlets of the first compressor 11 and the second compressor 12 are communicated with the outlet of the shell-and-tube evaporator 15; the fin condenser 13 is disposed below the heat radiation fan 2.
The four-pipe heating recovery system is provided with two compressors, and each compressor can control three modules: the three modes can be independently controlled. For example, the second compressor 12 may be in the heat recovery mode when the first compressor 11 in fig. 1 is in the single cooling mode.
Firstly, the refrigerant comes out through the left side of the first compressor 11, then enters the fin condenser 13 through a pipeline, enters the shell-and-tube evaporator through a throttle valve, and finally returns to the first compressor 11, and the mode is a single refrigeration mode. The single cooling mode is to cool the heat of the condenser by air.
The refrigerant passes out of the left side of the second compressor 12, enters the shell-and-tube condenser, then passes through the throttle valve, enters the shell-and-tube evaporator, and finally returns to the second compressor 12, which is the heat recovery cold mode. The heat recovery mode is to recover the heat of the condenser through the shell and tube and then to deliver the heat to the place where the heat source is needed in the form of hot water.
The water circulation heat exchange system comprises a hot water supply and return pipeline component and a cold water supply and return pipeline component, wherein the hot water supply and return pipeline component is arranged between the shell-and-tube condenser 14 and the tail end heat utilization equipment 16, the cold water supply and return pipeline component is arranged between the shell-and-tube evaporator 15 and the tail end heat utilization equipment 17, and the hot water supply and return pipeline component is connected with a bypass heat exchange structure.
The hot water supply and return pipeline assembly in this embodiment includes a hot water supply pipeline 18 and a hot water return pipeline 19, the hot water supply pipeline 18 and the hot water return pipeline 19 are respectively disposed between the shell-and-tube condenser 14 and the heat-using terminal equipment 16, and the hot water supply pipeline 18 and the hot water return pipeline 19 are both connected with the bypass heat exchange structure. The cold water supply and return line assembly includes a cold water supply line 20 and a cold water return line 21, the cold water supply line 20 and the cold water return line 21 being respectively disposed between the shell-and-tube evaporator 15 and the end-use cooling device 17.
Specifically, the first water supply bypass branch pipe 8 and the second water supply bypass branch pipe 10 are all arranged on the hot water supply pipeline 18, the first water return bypass branch pipe 7 and the second water return bypass branch pipe 9 are all arranged on the hot water return pipeline 19, the first bypass main pipe 5, between the first water return bypass branch pipe 7 and the first water supply bypass branch pipe 8, and the second bypass main pipe 6, between the second water return bypass branch pipe 9 and the second water supply bypass branch pipe 10 are all provided with three-way valves, so that the mode can be adjusted according to the characteristics of seasons, when the outdoor temperature of summer is higher, the reversing part 4 can adjust pipelines so that the bypass pipeline assembly is connected with the hot water supply pipeline 18, and when the outdoor temperature of winter is lower, the reversing part 4 can adjust pipelines so that the bypass pipeline is connected with the hot water return pipeline 19. The first bypass main pipe 5 or the second bypass main pipe 6 is provided with a bypass control valve, and the bypass control valve is provided in the first bypass main pipe 5 as shown in fig. 1, and the specific installation position of the bypass control valve is not limited here.
A water supply regulating valve 26 is arranged on the hot water supply pipeline 18 between the first water supply bypass branch pipe 8 and the second water supply bypass branch pipe 10, and a water return regulating valve 27 is arranged on the hot water return pipeline 19 between the first water return bypass branch pipe 7 and the second water return bypass branch pipe 9. The bypass regulating valve arranged on the first bypass main pipe 5 or the second bypass main pipe 6 is in linkage control with the water supply regulating valve 26 and the water return regulating valve 27, and in summer, the bypass regulating valve and the water supply regulating valve 26 are in linkage control, so that the total flow of a water supply outlet is unchanged, and the water return regulating valve 27 is normally open; in winter, the bypass regulating valve and the return water regulating valve 27 are mutually controlled in a linkage way, and in order to keep the total flow of the return water outlet unchanged, the water supply regulating valve 26 is normally opened. The design is strong in adaptability to seasons, the water temperature is flexibly adjusted, and the reliability of use is guaranteed.
Further preferably, the hot water supply and return pipeline assembly further comprises a water supply inlet temperature sensor 22 arranged at the inlet of the first water supply bypass branch pipe 8 and a water supply outlet temperature sensor 23 arranged at the outlet of the second water supply bypass branch pipe 10, and the water supply inlet temperature sensor 22 and the water supply outlet temperature sensor 23 are arranged on the hot water supply pipeline 18.
When the bypass line assembly is in communication with the hot water supply line 18, the inlet water temperature at the inlet of the bypass heat exchange structure in this mode of operation is detected by the water supply inlet temperature sensor 22 and the outlet water temperature at the outlet of the bypass heat exchange structure in this mode of operation is detected by the water supply outlet temperature sensor 23.
The hot water supply and return water pipeline assembly further comprises a return water inlet temperature sensor 24 arranged at the inlet of the second return water bypass branch pipe 9 and a return water outlet temperature sensor 25 arranged at the outlet of the first return water bypass branch pipe 7, and the return water inlet temperature sensor 24 and the return water outlet temperature sensor 25 are both arranged on the hot water return water pipeline 19.
When the bypass pipeline assembly is communicated with the hot water return pipeline 19, the water temperature of the inlet of the bypass heat exchange structure in the operation mode is detected by a return water inlet temperature sensor 24, and the water temperature of the outlet of the bypass heat exchange structure in the operation mode is obtained by a return water outlet temperature sensor 25.
Based on a general inventive concept, the embodiment of the invention also provides a control method of the four-pipe heating recovery system.
Referring to fig. 2, the control method provided by the present invention is used for controlling the four-pipe heating recovery system according to any one of the above embodiments, and includes the following steps:
S31, obtaining the inlet water temperature at the inlet of the bypass heat exchange structure;
s32, comparing the inlet water temperature with a preset outlet water temperature;
And S33, controlling at least one of the liquid flow of the bypass pipeline assembly, the water supply flow in the hot water supply pipeline 18 or the hot water return pipeline 19 and the fan rotating speed according to the comparison result.
For the sake of understanding, it should be further explained that the hot water supply line 18 is provided with a water supply adjusting valve 26, the hot water return line 19 is provided with a water return adjusting valve 27, both ends of the water supply adjusting valve 26 and the water return adjusting valve 27 are connected in parallel with a bypass heat exchange structure, the water supply adjusting valve 26 is used for adjusting the water supply flow in the hot water supply line 18, the water return adjusting valve 27 is used for adjusting the water supply flow in the hot water return line 19, and the flow control part 3 is used for adjusting the liquid flow of the bypass line assembly.
Controlling the liquid flow of the bypass line assembly, the water supply flow in the hot water supply line 18 or the hot water return line 19, and the fan speed according to the obtained magnitude relation, comprising:
judging whether the inlet water temperature is higher than a preset outlet water temperature;
If yes, controlling the liquid flow of the bypass pipeline assembly to be increased, controlling the water supply flow in the hot water supply pipeline 18 or the hot water return pipeline 19 to be reduced, and simultaneously controlling the heat dissipation fan 2 to operate at a set initial rotating speed;
In the control process, judging whether the outlet water temperature of the bypass heat exchange structure is equal to the preset outlet water temperature;
if not, after controlling the liquid flow of the bypass pipeline assembly to be increased to the maximum value, closing a water supply regulating valve 26 on the hot water supply pipeline 18 or a water return regulating valve 27 of the hot water return pipeline 19, and controlling the rotating speed of the heat radiation fan 2 to be continuously increased until the outlet water temperature is equal to the preset water outlet temperature;
When the rotation speed of the heat radiation fan 2 is controlled to be continuously increased until the outlet water temperature is equal to the preset outlet water temperature, the liquid flow of the bypass pipeline assembly, the water supply flow in the hot water supply pipeline 18 or the hot water return pipeline 19 and the rotation speed of the heat radiation fan 2 are kept unchanged;
after the water pump runs for a certain time, judging whether the outlet water temperature is smaller than the preset outlet water temperature;
If so, the rotating speed of the heat radiation fan 2 is controlled to be reduced until the outlet water temperature is equal to the preset outlet water temperature.
Regarding the above-described control of the rotational speed reduction of the heat radiation fan 2 until the outlet water temperature is equal to the preset outlet water temperature, the following are included:
Controlling the rotating speed of the heat radiation fan 2 to continuously reduce to a set initial rotating speed;
judging whether the outlet water temperature is equal to the preset outlet water temperature;
If not, the liquid flow of the bypass pipeline assembly is controlled to be reduced, and the water supply flow in the hot water supply pipeline 18 or the hot water return pipeline 19 is regulated to be increased until the outlet water temperature is equal to the preset outlet water temperature.
It should be noted that, before obtaining the inlet water temperature at the inlet of the bypass heat exchange structure, the method further includes:
Acquiring a seasonal operation mode;
the bypass heat exchange structure is controlled to be communicated with the hot water supply pipeline 18 or the hot water return pipeline 19 according to the acquired seasonal operation mode.
The season operation modes in the present embodiment include a summer operation mode and a winter operation mode, in which:
when the summer operation mode is acquired, the control bypass heat exchange structure is communicated with the hot water supply pipeline 18;
When the winter operation mode is acquired, the control and control bypass heat exchange structure is communicated with the hot water return pipeline 19.
In summer:
When the summer outdoor temperature is high, the three-way valve will adjust the line so that the bypass line assembly communicates with the hot water supply line 18. Acquiring a real-time temperature by a (hot water) water supply inlet temperature sensor 22, acquiring a real-time temperature for T1 (namely inlet water temperature), and acquiring a real-time temperature by a (hot water) water supply outlet temperature sensor 23, namely outlet water temperature, wherein the bypass flow in the bypass pipeline assembly is controlled by a bypass regulating valve to be Q1; the water supply regulating valve 26 regulates the water supply flow rate in the hot water supply line 18 to Q2; the heat radiation fan 2 controls the air quantity by controlling the actual rotating speed N.
As shown in the logic diagram of fig. 3, a water outlet temperature T0 (i.e. preset water outlet temperature T0) is set first, when T1 > T0, it is indicated that the indoor thermal load is reduced, the bypass regulating valve needs to be opened and the flow Q1 is increased, the water supply regulating valve 26 is controlled to be reduced in a linkage manner to reduce the flow Q2, the heat dissipation fan 2 is started, and the heat dissipation fan operates at a set initial rotation speed N0. When t2+.t0, the flow rate Q1 continues to be increased, and when Q1 reaches the maximum value Qmax, the rotation speed N1 of the heat radiation fan 2 starts to be increased, and finally t2=t0 is achieved. When t2=t0, all the regulating valves and the heat dissipation fan 2 (rotating speed) keep the existing state to operate. When T2 is less than T0, the flow Q1 is reduced only when the frequency rotation speed N1, N1 of the heat dissipation fan 2 needs to be reduced to the initial rotation speed N0, so that t2=t0, and then logic circulation is performed, and finally, the total outlet water temperature is ensured to meet the value of the set temperature.
During winter, the method comprises the following steps:
When the outdoor temperature is low in winter, the three-way valve will adjust the piping so that the bypass piping assembly communicates with the hot water return piping 19. Acquiring a real-time temperature by a (hot water) backwater inlet temperature sensor 24, wherein the real-time temperature is T1 (namely inlet water temperature), acquiring a real-time temperature by a (hot water) backwater outlet temperature sensor 25, wherein the real-time temperature is T2 (namely outlet water temperature), controlling bypass flow in a bypass pipeline assembly by a bypass regulating valve to be Q1, and regulating water supply flow in a hot water backwater pipeline 19 by a backwater regulating valve 27 to be Q2; the heat radiation fan 2 controls the air quantity by controlling the actual rotating speed N, and the specific logic control process is the same as summer.
In the control process, the water outlet temperature T0 set in summer is different from the water outlet temperature T0 set in winter, and the value of the water outlet temperature T0 is set according to actual needs.
In addition, the invention also provides an air conditioner unit, which comprises the four-pipe heating recovery system and can further comprise a shell, wherein the refrigerant system and the bypass heat exchange part 1 are arranged inside the shell, the water circulation heat exchange system is arranged outside the shell, and the bypass heat exchange part 1 is integrated inside the shell, so that the space utilization is facilitated, and the construction difficulty is reduced. The machine set can realize stepless regulation heat recovery, can adaptively remove waste heat and improve operation reliability; the automatic control system is added, so that the unit can be adjusted in a self-adaptive manner, and the burden of personnel is reduced; the heat recovery heat can be flexibly regulated and controlled, the heat recovery requirements under different environments can be better met, and the running stability and the self-adaptability of the whole unit are ensured.
The foregoing is merely illustrative embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think about variations or substitutions within the technical scope of the present invention, and the invention should be covered. Therefore, the protection scope of the invention is subject to the protection scope of the claims.
Claims (21)
1. The bypass heat exchange structure is characterized by comprising a bypass heat exchange part and a bypass pipeline assembly, wherein the bypass heat exchange part can be communicated with a hot water supply and return pipeline assembly of an air conditioning unit through the bypass pipeline assembly; the bypass pipeline assembly is provided with a flow control part and a reversing part, and the bypass heat exchange structure can be communicated with a hot water supply pipeline or a hot water return pipeline through the reversing part;
The bypass pipeline assembly comprises a bypass main pipe and bypass branch pipes, the two ends of the bypass heat exchange part are respectively provided with the bypass main pipe, one of the bypass main pipes is provided with the flow control part, each bypass main pipe is respectively provided with the bypass branch pipes communicated with the hot water supply pipeline and the hot water return pipeline, and a reversing part is arranged between the bypass main pipe and the corresponding bypass branch pipe.
2. The bypass heat exchange structure according to claim 1, wherein the bypass heat exchange portion is disposed in parallel with the fin condenser inside the air conditioning unit and both axes are disposed perpendicular to a horizontal plane.
3. The bypass heat exchange structure according to claim 2, wherein the bypass heat exchange portion is a bypass fin heat exchanger that is in the same horizontal position as a fin condenser inside the air conditioning unit.
4. The bypass heat exchange structure according to claim 2, wherein the flow control portion is a bypass adjustment valve, and the reversing portion is a three-way valve.
5. A four-pipe heating recovery system, which is characterized by comprising a refrigerant system, a water circulation heat exchange system and the bypass heat exchange structure according to any one of claims 1-4, wherein the bypass heat exchange structure is connected to the water circulation heat exchange system, and the refrigerant system and the water circulation heat exchange system form heat exchange.
6. The four-tube heat recovery system of claim 5, wherein the refrigerant system comprises a first compressor, a second compressor, a fin condenser, a shell and tube evaporator, and a heat rejection fan, wherein the first compressor and the second compressor are arranged in parallel; the inlets of the fin condenser and the shell-and-tube condenser are communicated with the outlets of the first compressor and the second compressor; the outlets of the fin condenser and the shell-and-tube condenser are communicated with the inlet of the shell-and-tube evaporator; the inlets of the first compressor and the second compressor are communicated with the outlet of the shell-and-tube evaporator.
7. The four-tube heat recovery system according to claim 6, wherein the water circulation heat exchange system comprises a hot water supply return line assembly and a cold water supply return line assembly, the hot water supply return line assembly being disposed between the shell and tube condenser and the end heat device, the cold water supply return line assembly being disposed between the shell and tube evaporator and the end cold device, the hot water supply return line assembly having the bypass heat exchange structure connected thereto.
8. The four-tube heat recovery system according to claim 7, wherein the hot water supply and return line assembly comprises a hot water supply line and a hot water return line, the hot water supply line and the hot water return line being disposed between the shell and tube condenser and the heat source for the end, respectively, the hot water supply line and the hot water return line being connected to the bypass heat exchange structure.
9. The four-pipe heating recovery system according to claim 8, wherein a first bypass main pipe and a second bypass main pipe are provided on the bypass heat exchange portion, the flow control portion is provided on the first bypass main pipe or the second bypass main pipe, and two bypass branch pipes connected to the hot water supply pipe and the hot water return pipe are provided on the first bypass main pipe and the second bypass main pipe, respectively.
10. The four-pipe heating and recovering system according to claim 9, wherein a first backwater bypass branch pipe connected with the hot water return pipe and a first water supply bypass branch pipe connected with the hot water supply pipe are provided on the first bypass main pipe, a second backwater bypass branch pipe connected with the hot water return pipe and a second water supply bypass branch pipe connected with the hot water supply pipe are provided on the second bypass main pipe, a water supply regulating valve is provided on the hot water supply pipe between the first water supply bypass branch pipe and the second water supply bypass branch pipe, and a water return regulating valve is provided on the hot water return pipe between the first backwater bypass branch pipe and the second backwater bypass branch pipe.
11. The four-pipe heating recovery system according to claim 10, wherein the hot water supply and return line assembly further comprises a water supply inlet temperature sensor provided at an inlet of the first water supply bypass branch pipe, and a water supply outlet temperature sensor provided at an outlet of the second water supply bypass branch pipe, and both the water supply inlet temperature sensor and the water supply outlet temperature sensor are provided on the hot water supply line.
12. The four-pipe heating and recovery system according to claim 10, wherein the hot water supply and return water line assembly further comprises a return water inlet temperature sensor disposed at the inlet of the second return water bypass branch pipe, and a return water outlet temperature sensor disposed at the outlet of the first return water bypass branch pipe, and wherein the return water inlet temperature sensor and the return water outlet temperature sensor are both disposed on the hot water return line.
13. An air conditioning unit comprising the four-pipe heat recovery system of any one of claims 5 to 12.
14. The air conditioning unit according to claim 13, further comprising a housing, wherein the refrigerant system and the bypass heat exchange portion are both disposed inside the housing, and wherein the water circulation heat exchange system is disposed outside the housing.
15. A control method of a four-pipe heat recovery system, characterized by being used for controlling the four-pipe heat recovery system according to any one of claims 5 to 12, comprising the steps of:
acquiring the inlet water temperature at the inlet of the bypass heat exchange structure;
comparing the inlet water temperature with a preset outlet water temperature;
And controlling at least one of the liquid flow of the bypass pipeline assembly, the water supply flow of the hot water supply pipeline or the hot water return pipeline and the rotating speed of the fan according to the comparison result.
16. The method according to claim 15, wherein a water supply regulating valve is provided on the hot water supply pipe, a water return regulating valve is provided on the hot water return pipe, both ends of the water supply regulating valve and the water return regulating valve are connected in parallel with the bypass heat exchange structure, the water supply regulating valve is used for regulating a water supply flow rate in the hot water supply pipe, the water return regulating valve is used for regulating a water supply flow rate in the hot water return pipe, and the flow control portion is used for regulating a liquid flow rate of a bypass pipe assembly.
17. A method of controlling a four-pipe heat recovery system according to claim 15 or 16, wherein controlling the flow rate of the liquid in the bypass line assembly, the flow rate of the water in the hot water supply line or the hot water return line, and the rotation speed of the blower according to the obtained magnitude relation comprises:
judging whether the inlet water temperature is higher than the preset outlet water temperature;
If yes, controlling the liquid flow of the bypass pipeline assembly to be increased, controlling the water supply flow in the hot water supply pipeline or the hot water return pipeline to be reduced, and controlling the heat dissipation fan to run at a set initial rotation speed;
in the control process, judging whether the outlet water temperature of the bypass heat exchange structure is equal to the preset outlet water temperature;
if not, after controlling the liquid flow of the bypass pipeline assembly to be increased to the maximum value, controlling a valve on a hot water supply pipeline or a hot water return pipeline to be closed, and controlling the rotating speed of the heat radiation fan to be continuously increased until the outlet water temperature is equal to the preset outlet water temperature.
18. A control method of a four-pipe heat recovery system according to claim 17,
When the rotation speed of the heat radiation fan is controlled to be continuously increased until the water temperature of the outlet is equal to the preset water outlet temperature, the liquid flow of the bypass pipeline assembly, the water supply flow in the hot water supply pipeline or the hot water return pipeline and the rotation speed of the heat radiation fan are kept unchanged;
After the water pump operates for a certain time, judging whether the outlet water temperature is smaller than the preset outlet water temperature;
If yes, controlling the rotating speed of the heat radiation fan to be reduced until the outlet water temperature is equal to the preset outlet water temperature.
19. The method of controlling a four-tube heat recovery system according to claim 18, wherein, in relation to the controlling the rotational speed of the heat radiation fan to decrease until the outlet water temperature is equal to the preset outlet water temperature, comprising:
controlling the rotating speed of the heat radiation fan to continuously reduce to a set initial rotating speed;
judging whether the outlet water temperature is equal to the preset outlet water temperature;
If not, controlling the liquid flow of the bypass pipeline assembly to be reduced, and adjusting the water supply flow in the hot water supply pipeline or the hot water return pipeline to be increased until the outlet water temperature is equal to the preset outlet water temperature.
20. The method of controlling a four-tube heat recovery system according to claim 15, further comprising, prior to said obtaining the inlet water temperature at the inlet of the bypass heat exchange structure:
Acquiring a seasonal operation mode;
and controlling the bypass heat exchange structure to be communicated with a hot water supply pipeline or a hot water return pipeline according to the acquired seasonal operation mode.
21. The control method of a four-tube heat recovery system according to claim 20, wherein the seasonal operation mode includes a summer operation mode and a winter operation mode, wherein:
When the summer operation mode is acquired, the bypass heat exchange structure is controlled to be communicated with the hot water supply pipeline;
When the winter operation mode is acquired, the bypass heat exchange structure is controlled to be communicated with the hot water return pipeline.
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