CN113654265A - Air conditioning unit and control method thereof - Google Patents

Air conditioning unit and control method thereof Download PDF

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Publication number
CN113654265A
CN113654265A CN202111081418.6A CN202111081418A CN113654265A CN 113654265 A CN113654265 A CN 113654265A CN 202111081418 A CN202111081418 A CN 202111081418A CN 113654265 A CN113654265 A CN 113654265A
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CN
China
Prior art keywords
heat exchanger
valve
hot water
mode
air conditioning
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Pending
Application number
CN202111081418.6A
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Chinese (zh)
Inventor
钟海玲
程琦
林少丹
李顺意
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Gree Green Refrigeration Technology Center Co Ltd of Zhuhai
Original Assignee
Gree Electric Appliances Inc of Zhuhai
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Application filed by Gree Electric Appliances Inc of Zhuhai filed Critical Gree Electric Appliances Inc of Zhuhai
Priority to CN202111081418.6A priority Critical patent/CN113654265A/en
Publication of CN113654265A publication Critical patent/CN113654265A/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
    • F25B13/00—Compression machines, plants or systems, with reversible cycle
    • 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
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F24F11/46—Improving electric energy efficiency or saving
    • 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
    • F24F11/50—Control or safety arrangements characterised by user interfaces or communication
    • F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
    • 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
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F3/00—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems
    • F24F3/06—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the arrangements for the supply of heat-exchange fluid for the subsequent treatment of primary air in the room units
    • F24F3/08—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the arrangements for the supply of heat-exchange fluid for the subsequent treatment of primary air in the room units with separate supply and return lines for hot and cold heat-exchange fluids i.e. so-called "4-conduit" system
    • 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
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/30—Expansion means; Dispositions thereof
    • F25B41/31—Expansion valves
    • F25B41/34—Expansion valves with the valve member being actuated by electric means, e.g. by piezoelectric actuators
    • 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
    • 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]
    • Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Signal Processing (AREA)
  • Fuzzy Systems (AREA)
  • Mathematical Physics (AREA)
  • Human Computer Interaction (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

The invention discloses an air conditioning unit and a control method thereof, wherein the air conditioning unit comprises: the compressor, the four-way valve, the hot water heat exchanger and the cold water heat exchanger are connected in sequence; the first inlet of the intermediate heat exchanger is connected with a refrigerant outlet of the hot water heat exchanger, the first outlet of the intermediate heat exchanger is connected with a refrigerant inlet of the cold water heat exchanger, the second inlet of the intermediate heat exchanger is respectively connected with a hot water inlet of the hot water heat exchanger and a chilled water inlet of the cold water heat exchanger, and the second outlet of the intermediate heat exchanger is respectively connected with the first connecting point and the second connecting point; and the valve assembly is positioned on a pipeline between the intermediate heat exchanger and the hot water heat exchanger and a pipeline between the intermediate heat exchanger and the cold water heat exchanger and used for controlling the intermediate heat exchanger to be connected with the hot water heat exchanger or controlling the intermediate heat exchanger to be connected with the cold water heat exchanger. The invention solves the problem of energy waste caused by unbalanced cold heat demand in the four-pipe air conditioning unit in the prior art, improves the energy utilization rate, and simultaneously realizes the improvement of the energy output of the hot water side or the cold water side.

Description

Air conditioning unit and control method thereof
Technical Field
The invention relates to the technical field of air conditioners, in particular to an air conditioning unit and a control method thereof.
Background
The air conditioning unit is a temperature control device necessary for buildings such as hotels, restaurants and the like. The four-pipe unit is favored because it can provide cold water and hot water at the same time. When the mode of simultaneously preparing cold water and hot water is started, the heat exchangers participating in circulation at the moment are the hot water preparing heat exchanger and the cold water preparing heat exchanger.
In practical application, the situation often occurs, and the deviation of the hot water demand and the cold water demand from the design value of the unit is large, so that a state of partial excess of cold or heat is caused. In the prior art, the method for solving the problems is a method of bypassing hot (cold) water or a refrigerant, and although the method solves the state of finally outputting cold and heat balance, the method still cannot solve the problem of energy waste by sacrificing the quantity of hot (cold) water or the quantity of refrigerant.
Aiming at the problem of energy waste caused by unbalanced cold heat demand in a four-pipe air conditioning unit in the related art, no effective solution is provided at present.
Disclosure of Invention
The invention provides an air conditioning unit and a control method thereof, which at least solve the problem of energy waste caused by unbalanced cold heat requirement in a four-pipe air conditioning unit in the prior art.
To solve the above technical problem, according to an aspect of an embodiment of the present invention, there is provided an air conditioning unit including:
the compressor, the four-way valve, the hot water heat exchanger and the cold water heat exchanger are connected in sequence;
an intermediate heat exchanger comprising a first inlet, a first outlet, a second inlet, and a second outlet; the first inlet is connected with a refrigerant outlet of the hot water heat exchanger, the first outlet is connected with a refrigerant inlet of the cold water heat exchanger, the second inlet is respectively connected with a hot water inlet of the hot water heat exchanger and a chilled water inlet of the cold water heat exchanger, and the second outlet is respectively connected with the first connecting point and the second connecting point; the first connecting point is positioned on a pipeline between the second inlet and the hot water inlet, and the second connecting point is positioned on a pipeline between the second inlet and the chilled water inlet;
and the valve assembly is positioned on a pipeline between the intermediate heat exchanger and the hot water heat exchanger and a pipeline between the intermediate heat exchanger and the cold water heat exchanger and used for controlling the intermediate heat exchanger to be communicated with the hot water heat exchanger or the intermediate heat exchanger to be communicated with the cold water heat exchanger.
Further, the valve assembly comprises:
the first switch valve is positioned on a pipeline between the second inlet and the chilled water inlet;
the second switch valve is positioned on the pipeline between the second outlet and the second connecting point;
the third switch valve is positioned on the pipeline between the second inlet and the hot water inlet;
and the fourth switching valve is positioned on the pipeline between the second outlet and the first connecting point.
Furthermore, a D port of the four-way valve is connected with an exhaust port of the compressor, an S port of the four-way valve is connected with an air suction port of the compressor, an E port of the four-way valve is connected with a refrigerant inlet of the hot water heat exchanger, and a C port of the four-way valve is connected with a refrigerant inlet of the cold water heat exchanger; the air conditioning unit still includes:
and one end of the third heat exchanger is connected with the port C of the four-way valve, and the other end of the third heat exchanger is connected with a third connecting point arranged between a refrigerant inlet and a first outlet of the cold water heat exchanger.
Further, still include:
the first one-way valve is positioned on a pipeline between the S port of the four-way valve and the suction port of the compressor and used for preventing a refrigerant of the suction port of the compressor from flowing back to the S port of the four-way valve; a fourth connecting point is arranged on a pipeline between the first one-way valve and the air suction port of the compressor, and the fourth connecting point is connected with a refrigerant outlet of the cold water heat exchanger;
and the second one-way valve is positioned on a pipeline between the fourth connecting point and the refrigerant outlet of the cold water heat exchanger and used for preventing the refrigerant of the fourth connecting point from flowing back to the refrigerant outlet of the cold water heat exchanger.
Further, still include:
and the first electronic expansion valve is positioned on a pipeline between the third connecting point and the refrigerant inlet of the cold water heat exchanger.
Further, the valve assembly further comprises: the fifth switch valve is positioned on a pipeline between the first inlet and the refrigerant outlet of the hot water heat exchanger; a fifth connecting point is further arranged on a pipeline between the fifth switch valve and a refrigerant outlet of the hot water heat exchanger, and a sixth connecting point is further arranged on a pipeline between the third connecting point and the first electronic expansion valve;
the air conditioning unit still includes: and one end of the second electronic expansion valve is connected with the fifth connecting point, and the other end of the second electronic expansion valve is connected with the sixth connecting point.
According to another aspect of the embodiments of the present invention, there is provided an air conditioning unit control method, applied to the air conditioning unit as described above, the method including:
detecting an operation load parameter of the air conditioning unit;
determining an operation mode of the air conditioning unit according to the operation load parameter; wherein the operation mode at least comprises: a cooling mode, a heating mode, a forced cooling mode and a forced hot mode;
and controlling the operation of the air conditioning unit according to the operation mode.
Further, the operation mode at least further includes: meanwhile, a refrigeration and heating mode is adopted; before detecting the operating load parameter of the air conditioning unit, the method further comprises the following steps:
and detecting the current operation mode of the air conditioning unit, and triggering and detecting the operation load parameters of the air conditioning unit when the current operation mode is the simultaneous cooling and heating mode.
Further, the operation load parameters include a hot water temperature change rate and a cold water temperature change rate; determining the operation mode of the air conditioning unit according to the operation load parameters, comprising the following steps:
if the cold water temperature change rate is greater than the preset maximum cold water temperature change rate and the cold water temperature change rate is greater than the hot water temperature change rate within the continuous first preset time, determining that the operation mode is a forced cooling mode;
if the change rate of the hot water temperature is greater than the preset maximum change rate of the hot water temperature and the change rate of the hot water temperature is greater than the change rate of the cold water temperature within the continuous second preset time, determining that the operation mode is a forced thermal mode;
and if the operation mode is not the forced cooling mode or the forced heating mode, determining that the operation mode is the cooling mode or the heating mode.
Further, after determining that the operation mode is the strong cooling mode, the method further includes: if the cold water temperature change rate is less than or equal to the preset minimum cold water temperature change rate within the continuous first preset time, exiting the forced cooling mode;
after determining that the operation mode is the forced hot mode, the method further comprises the following steps: and if the change rate of the hot water temperature is less than or equal to the preset minimum change rate of the hot water temperature within the continuous second preset time, the forced hot mode is exited.
Further, the operation of the air conditioning unit is controlled according to the operation mode, and the method comprises the following steps:
when the operation mode is a strong refrigeration mode, controlling the first electromagnetic valve and the second electromagnetic valve to be closed, the third electromagnetic valve and the fourth electromagnetic valve to be opened, the fifth electromagnetic valve to be opened, the first electronic expansion valve to be opened and the second electronic expansion valve to be closed;
when the operation mode is a forced hot mode, controlling the first electromagnetic valve and the second electromagnetic valve to be opened, the third electromagnetic valve and the fourth electromagnetic valve to be closed, the fifth electromagnetic valve to be opened, the first electronic expansion valve to be opened and the second electronic expansion valve to be closed;
when the operation mode is a refrigeration mode, controlling the first electromagnetic valve, the second electromagnetic valve, the third electromagnetic valve, the fourth electromagnetic valve and the fifth electromagnetic valve to be closed, opening the first electronic expansion valve and closing the second electronic expansion valve;
when the operation mode is a heating mode, controlling the first electromagnetic valve, the second electromagnetic valve, the third electromagnetic valve, the fourth electromagnetic valve and the fifth electromagnetic valve to be closed, closing the first electronic expansion valve and opening the second electronic expansion valve;
and when the operation mode is the simultaneous cooling and heating mode, the first electromagnetic valve, the second electromagnetic valve, the third electromagnetic valve, the fourth electromagnetic valve and the fifth electromagnetic valve are controlled to be closed, the first electronic expansion valve is opened, and the second electronic expansion valve is opened.
According to yet another aspect of an embodiment of the present invention, there is provided a storage medium containing computer-executable instructions for performing the air conditioning unit control method as described above when executed by a computer processor.
The invention provides an air conditioning unit which is provided with an intermediate heat exchanger, wherein the intermediate heat exchanger is connected with a hot water inlet of a hot water heat exchanger and a chilled water inlet of a cold water heat exchanger, and is controlled to be connected with the hot water heat exchanger through a valve component, or the intermediate heat exchanger is connected with the cold water heat exchanger. Through middle heat exchanger, with the surplus energy transfer of hot water side (cold water side) cold water side (hot water side), thereby surplus energy obtains make full use of and has improved energy utilization, realizes improving the energy output of hot water side or cold water side simultaneously.
Drawings
Fig. 1 is a schematic view of an alternative configuration of an air conditioning assembly according to an embodiment of the present invention;
FIG. 2 is an alternative flow chart of an air conditioning unit control method according to an embodiment of the present invention;
fig. 3 is another alternative flow chart of an air conditioning unit control method according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the invention, as detailed in the appended claims.
Example 1
In a preferred embodiment 1 of the present invention, an air conditioning unit is provided, and specifically, fig. 1 shows an alternative structural schematic diagram of the air conditioning unit, as shown in fig. 1, the air conditioning unit includes:
the compressor 1, the four-way valve 2, the hot water heat exchanger 7 and the cold water heat exchanger 6 are connected in sequence;
an intermediate heat exchanger 11 including a first inlet 111, a first outlet 112, a second inlet 113, and a second outlet 114; the first inlet 111 is connected with a refrigerant outlet of the hot water heat exchanger 7, the first outlet 112 is connected with a refrigerant inlet of the cold water heat exchanger 6, the second inlet 113 is respectively connected with a hot water inlet of the hot water heat exchanger 7 and a chilled water inlet of the cold water heat exchanger 6, and the second outlet 114 is respectively connected with a first connection point and a second connection point; wherein the first connection point is located on the pipeline between the second inlet 113 and the hot water inlet, and the second connection point is located on the pipeline between the second inlet 113 and the chilled water inlet;
and valve assemblies which are positioned on the pipeline between the intermediate heat exchanger 11 and the hot water heat exchanger 7 and the pipeline between the intermediate heat exchanger 11 and the cold water heat exchanger 6 and are used for controlling the communication between the intermediate heat exchanger 11 and the hot water heat exchanger 7 or the communication between the intermediate heat exchanger 11 and the cold water heat exchanger 6.
In the above embodiments, an air conditioning unit is provided, where the air conditioning unit is provided with an intermediate heat exchanger, and is connected to a hot water inlet of a hot water heat exchanger and a chilled water inlet of a cold water heat exchanger, and controls the intermediate heat exchanger to be connected to the hot water heat exchanger or the intermediate heat exchanger to be connected to the cold water heat exchanger through a valve assembly. Through middle heat exchanger, with the surplus energy transfer of hot water side (cold water side) cold water side (hot water side), thereby surplus energy obtains make full use of and has improved energy utilization, realizes improving the energy output of hot water side or cold water side simultaneously.
As shown in fig. 1, the valve assembly comprises: a first switching valve 14 located on a pipe between the second inlet 113 and the chilled water inlet; a second switching valve 12 provided on a pipeline between the second outlet 114 and the second connection point; a third on/off valve 15 located on the pipe between the second inlet 113 and the hot water inlet; and a fourth switching valve 13 on the line between the second outlet 114 and the first connection point. The switch valve can be an electromagnetic valve, a butterfly valve or other switch valves.
In addition, the valve assembly further comprises: and a fifth on-off valve 10 positioned on a pipeline between the first inlet 111 and the refrigerant outlet of the hot water heat exchanger 7. The fifth switching valve 10 may control the state of the intermediate heat exchanger 11 to determine whether to activate the intermediate heat exchanger 11.
A D port of the four-way valve 2 is connected with an exhaust port of the compressor 1, an S port of the four-way valve 2 is connected with a suction port of the compressor 1, an E port of the four-way valve 2 is connected with a refrigerant inlet of the hot water heat exchanger 7, and a C port of the four-way valve 2 is connected with a refrigerant inlet of the cold water heat exchanger 6; based on the above-mentioned relation of connection, the air conditioning unit still includes: and one end of the third heat exchanger 3 is connected with the port C of the four-way valve 2, and the other end is connected with a third connection point arranged between the refrigerant inlet and the first outlet 112 of the cold water heat exchanger 6. The third heat exchanger 3 is a fin heat exchanger or another heat exchanger, and is used for performing complete refrigerant circulation in cooperation with the hot water heat exchanger 7 or the cold water heat exchanger 6 in a conventional refrigeration or heating mode.
In addition, this air conditioning unit still includes: a first check valve 8, which is positioned on a pipeline between the S port of the four-way valve 2 and the suction port of the compressor 1 and is used for preventing the refrigerant of the suction port of the compressor 1 from flowing back to the S port of the four-way valve 2; a fourth connecting point is arranged on a pipeline between the first check valve 8 and the air suction port of the compressor 1, and the fourth connecting point is connected with a refrigerant outlet of the cold water heat exchanger 6; and the second one-way valve 9 is positioned on a pipeline between the fourth connecting point and the refrigerant outlet of the cold water heat exchanger 6 and used for preventing the refrigerant of the fourth connecting point from flowing back to the refrigerant outlet of the cold water heat exchanger 6.
In order to control the refrigerant flow direction, realize different operating modes, this air conditioning unit still includes: and the first electronic expansion valve 4 is positioned on a pipeline between the third connecting point and the refrigerant inlet of the cold water heat exchanger 6.
A fifth connection point is further arranged on a pipeline between the fifth switch valve 10 and the refrigerant outlet of the hot water heat exchanger 7, and a sixth connection point is further arranged on a pipeline between the third connection point and the first electronic expansion valve 4; the air conditioning unit still includes: and one end of the second electronic expansion valve 5 is connected with the fifth connection point, and the other end of the second electronic expansion valve is connected with the sixth connection point.
The first electronic expansion valve 4 and the second electronic expansion valve 5 can be controlled in different operation modes in combination with the fifth switching valve 10. The operation mode of the air conditioning unit comprises the following steps: meanwhile, the system comprises a refrigeration and heating mode, a refrigeration mode, a heating mode, a forced refrigeration mode and a forced hot mode.
In the strong refrigeration mode, the refrigeration load is greater than the heating load, at the moment, the third switch valve 15 and the fourth switch valve 13 are opened, part of hot water is taken from the hot water inlet side to exchange heat with the medium-temperature refrigerant condensed from the hot water heat exchanger 7, and the temperature of the part of hot water is lower than that of the refrigerant condensed from the hot water heat exchanger 7, so that the heat of the refrigerant is partially released to the part of hot water to be subcooled, and the refrigeration amount of the refrigerant of unit mass can be increased by increasing the supercooling degree; meanwhile, the temperature of the part of hot water is increased and is mixed with the inlet water of the chilled water, so that the inlet water temperature is increased, the evaporation temperature of the refrigerant in the chilled water heat exchanger is increased, and the refrigerating capacity is also increased. In the whole process, the supercooling degree and the evaporating temperature of the refrigerant of the system are improved, so that the refrigerating capacity is provided, namely surplus heat on the hot water side is transferred to the cold water side, and the surplus energy is fully utilized, so that the energy utilization rate is improved.
When the forced hot mode is adopted, the heating load is greater than the refrigerating load, at the moment, the first switch valve 14 and the second switch valve 12 are opened, part of chilled water is taken from the chilled water inlet side to exchange heat with the medium-temperature refrigerant condensed from the hot water heat exchanger 7, so that the heat of the refrigerant is partially released to the hot water to be supercooled, and the refrigerating capacity of the refrigerant per unit mass can be increased by increasing the supercooling degree; by the reverse refrigerant circulation principle, the heating capacity is approximately equal to the refrigerating capacity plus the power of the compressor 1, and the refrigerating capacity of the refrigerant with unit mass is provided due to the fact that the supercooling degree is improved in the process, and therefore the heating capacity can be indirectly improved. The surplus heat on the freezing water side is transferred to the hot water side, and the surplus energy is fully utilized, so that the energy utilization rate is improved.
In summary, the principle of the forced cooling mode and the forced heating mode is the same, but the difference is that the hot water is taken into the intermediate heat exchanger 11 in the forced cooling mode, and the hot water demand is small at this time, so that the demand of the user side is not affected by taking a part of the hot water. When heating is forced, the cooling water enters the intermediate heat exchanger 11, and because the demand of the cooling water is small, the demand of the user side is not influenced by taking a part from the cooling water.
Example 2
In a preferred embodiment 2 of the present invention, there is provided an air conditioning unit control method applied to the air conditioning unit in the above embodiment 1. In particular, fig. 2 shows an alternative flow chart of the method, which, as shown in fig. 2, comprises the following steps S202-S206:
s202: detecting an operation load parameter of the air conditioning unit;
s204: determining an operation mode of the air conditioning unit according to the operation load parameter; wherein the operation mode at least comprises: a cooling mode, a heating mode, a forced cooling mode and a forced hot mode;
s206: and controlling the operation of the air conditioning unit according to the operation mode.
In the above embodiments, an air conditioning unit is provided, where the air conditioning unit is provided with an intermediate heat exchanger, and is connected to a hot water inlet of a hot water heat exchanger and a chilled water inlet of a cold water heat exchanger, and controls the intermediate heat exchanger to be connected to the hot water heat exchanger or the intermediate heat exchanger to be connected to the cold water heat exchanger through a valve assembly. Through middle heat exchanger, with the surplus energy transfer of hot water side (cold water side) cold water side (hot water side), thereby surplus energy obtains make full use of and has improved energy utilization, realizes improving the energy output of hot water side or cold water side simultaneously.
Wherein, the operation mode still includes at least: meanwhile, a refrigeration and heating mode is adopted; before detecting the operating load parameter of the air conditioning unit, the method further comprises the following steps:
and detecting the current operation mode of the air conditioning unit, and triggering and detecting the operation load parameters of the air conditioning unit when the current operation mode is the simultaneous cooling and heating mode. Meanwhile, the strong refrigeration or forced heating requirements exist under the condition of refrigeration and heating, so that the operation load parameters of the air conditioning unit are triggered and detected in the time refrigeration and heating mode, and the operation mode of the air conditioning unit is determined according to the operation load parameters.
Specifically, the operation load parameters include a hot water temperature change rate and a cold water temperature change rate; determining the operation mode of the air conditioning unit according to the operation load parameters, comprising the following steps: if the cold water temperature change rate is greater than the preset maximum cold water temperature change rate and the cold water temperature change rate is greater than the hot water temperature change rate within the continuous first preset time, determining that the operation mode is a forced cooling mode; if the change rate of the hot water temperature is greater than the preset maximum change rate of the hot water temperature and the change rate of the hot water temperature is greater than the change rate of the cold water temperature within the continuous second preset time, determining that the operation mode is a forced thermal mode; and if the operation mode is not the forced cooling mode or the forced heating mode, determining that the operation mode is the cooling mode or the heating mode. The basic principle of the above judgment is as follows: when the heating load demand is greater than the refrigerating load demand, operating a forced hot mode; and when the heating load demand is less than the refrigerating load demand, operating a forced cooling mode. The forced heating mode and the forced cooling mode can only be selected from one mode and cannot coexist at the same time, and when the unit is not in the forced cooling mode or the forced heating mode, the unit is a conventional cooling or heating mode. The normal cooling or heating mode may be determined according to an operation mode displayed on the control panel, and the operation mode may be determined by the unit according to an operation condition or an operation mode input by a user.
After the operation mode is determined to be the forced cooling mode, the method further comprises the following steps: if the cold water temperature change rate is less than or equal to the preset minimum cold water temperature change rate within the continuous first preset time, exiting the forced cooling mode; after determining that the operation mode is the forced hot mode, the method further comprises the following steps: and if the change rate of the hot water temperature is less than or equal to the preset minimum change rate of the hot water temperature within the continuous second preset time, the forced hot mode is exited.
Specifically, the operation of the air conditioning unit is controlled according to the operation mode, and the method comprises the following steps:
when the operation mode is a strong refrigeration mode, controlling the first electromagnetic valve and the second electromagnetic valve to be closed, the third electromagnetic valve and the fourth electromagnetic valve to be opened, the fifth electromagnetic valve to be opened, the first electronic expansion valve to be opened and the second electronic expansion valve to be closed; at this time, the refrigerant flow direction is as follows: compressor 1 → D port of the four-way valve 2 (not energized → E port of the four-way valve 2 → hot water heat exchanger 7 → solenoid valve 10 → heat exchanger 11 → electronic expansion valve 4 → chilled water heat exchanger 6 → check valve 9 → compressor 1;
when the operation mode is a forced hot mode, controlling the first electromagnetic valve and the second electromagnetic valve to be opened, the third electromagnetic valve and the fourth electromagnetic valve to be closed, the fifth electromagnetic valve to be opened, the first electronic expansion valve to be opened and the second electronic expansion valve to be closed; at this time, the refrigerant flow direction is as follows: compressor 1 → D port of the four-way valve 2 (electrically commutated → E port of the four-way valve 2 → hot water heat exchanger 7 → solenoid valve 10 → heat exchanger 11 → electronic expansion valve 4 → chilled water heat exchanger 6 → check valve 9 → compressor 1;
when the operation mode is a refrigeration mode, controlling the first electromagnetic valve, the second electromagnetic valve, the third electromagnetic valve, the fourth electromagnetic valve and the fifth electromagnetic valve to be closed, opening the first electronic expansion valve and closing the second electronic expansion valve; at this time, the refrigerant flow direction is as follows: compressor 1 → D port of the four-way valve 2 (not energized → C port of the four-way valve 2 → fin heat exchanger 3 → electronic expansion valve 4 → chilled water heat exchanger 6 → check valve 9 → compressor 1;
when the operation mode is a heating mode, controlling the first electromagnetic valve, the second electromagnetic valve, the third electromagnetic valve, the fourth electromagnetic valve and the fifth electromagnetic valve to be closed, closing the first electronic expansion valve and opening the second electronic expansion valve; at this time, the refrigerant flow direction is as follows: compressor 1 → D port of the four-way valve 2 (power-on reversing → E port of the four-way valve 2 → hot water heat exchanger 7 → electronic expansion valve 5 → finned heat exchanger 3 → four-way valve 2 → check valve 8 → compressor 1;
and when the operation mode is the simultaneous cooling and heating mode, the first electromagnetic valve, the second electromagnetic valve, the third electromagnetic valve, the fourth electromagnetic valve and the fifth electromagnetic valve are controlled to be closed, the first electronic expansion valve is opened, and the second electronic expansion valve is opened. At this time, the refrigerant flow direction is as follows: compressor 1 → D port of the four-way valve 2 (energized → E port of the four-way valve 2 → hot water heat exchanger 7 → electronic expansion valve 4 → chilled water heat exchanger 6 → check valve 9 → compressor 1. The simultaneous cooling and heating mode can be a simultaneous cooling and heating mode before a strong cooling mode or a forced heating mode, and can also be a simultaneous cooling and heating mode selected according to the needs of a user.
In a preferred embodiment 2 of the present invention, another air conditioning unit control method is further provided, and specifically, fig. 3 shows an optional flowchart of the method, and as shown in fig. 3, the method includes the following steps S301 to S310:
s301: a refrigeration and heating mode is carried out while the operation is carried out;
s302: detecting the change rate delta TC of the cold water temperature in continuous TC time (first preset time), wherein the delta TC is TCoutt-TCout(t-60)；
S303: judging whether delta TC & gt TC1 and delta TC & delta TH are true or not; wherein, TC1 is the upper limit value of the change rate of the cold water temperature, Δ TH is the change rate of the hot water temperature, and Δ TH is THoutt-THout(t-60)(ii) a If yes, executing step S304, otherwise executing step S305;
s304: if yes, entering a strong cooling mode, opening SV0 (a fifth switch valve), SV3 (a third switch valve) and SV4 (a fourth switch valve), and closing SV1 (a first switch valve) and SV1 (a first switch valve); the flow ends;
s305: if not, closing SV3 (third switch valve), SV4 (fourth switch valve), and closing SV1 (first switch valve), SV2 (second switch valve); then, the process proceeds to step S310;
s306: detecting the change rate Delta TH of the temperature of the hot water in the continuous TH time (second preset time);
s307: judging whether the DeltaTH is more than TH1 and the DeltaTH is more than DeltaTC; wherein TH1 is the upper limit value of the rate of change of the temperature of the hot water; if yes, executing step S308, otherwise executing step S309;
s308: if yes, entering a forced hot mode, opening SV0 (a fifth switch valve), SV1 (a first switch valve) and SV2 (a second switch valve), and closing SV3 (a third switch valve) and SV4 (a fourth switch valve); the flow ends;
s309: if not, closing SV1 (first switch valve), SV2 (second switch valve), and closing SV3 (third switch valve), SV4 (fourth switch valve); then, step S310 is executed;
s310: SV0 (fifth switching valve) is closed; when the change rate Delta TH of the hot water temperature is less than or equal to the lower limit value TH2 of the change rate of the hot water in the continuous TH time, exiting the forced hot mode; when the change rate delta TC of the cold water temperature of the cold water is less than or equal to the upper limit value TC2 of the change rate of the chilled water in the continuous TC time, exiting the forced cooling mode; the strong cooling or forced heating mode is exited and only the normal cooling or heating mode is operated, at which time the control closes SV0 (fifth switching valve).
Example 3
Based on the air conditioning unit control method provided in embodiment 2 above, there is also provided in a preferred embodiment 3 of the present invention a storage medium containing computer-executable instructions for performing the air conditioning unit control method as described above when executed by a computer processor.
In the above embodiments, an air conditioning unit is provided, where the air conditioning unit is provided with an intermediate heat exchanger, and is connected to a hot water inlet of a hot water heat exchanger and a chilled water inlet of a cold water heat exchanger, and controls the intermediate heat exchanger to be connected to the hot water heat exchanger or the intermediate heat exchanger to be connected to the cold water heat exchanger through a valve assembly. Through middle heat exchanger, with the surplus energy transfer of hot water side (cold water side) cold water side (hot water side), thereby surplus energy obtains make full use of and has improved energy utilization, realizes improving the energy output of hot water side or cold water side simultaneously.
Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.
It will be understood that the invention is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the invention is limited only by the appended claims.

Claims (12)

1. An air conditioning assembly, comprising: the compressor (1), the four-way valve (2), the hot water heat exchanger (7) and the cold water heat exchanger (6) are connected in sequence; further comprising:
an intermediate heat exchanger (11) comprising a first inlet (111), a first outlet (112), a second inlet (113) and a second outlet (114); the first inlet (111) is connected with a refrigerant outlet of the hot water heat exchanger (7), the first outlet (112) is connected with a refrigerant inlet of the cold water heat exchanger (6), the second inlet (113) is respectively connected with a hot water inlet of the hot water heat exchanger (7) and a chilled water inlet of the cold water heat exchanger (6), and the second outlet (114) is respectively connected with a first connection point and a second connection point; wherein the first connection point is located on a pipeline between the second inlet (113) and the hot water inlet, and the second connection point is located on a pipeline between the second inlet (113) and the chilled water inlet;
and the valve assemblies are positioned on a pipeline between the intermediate heat exchanger (11) and the hot water heat exchanger (7) and a pipeline between the intermediate heat exchanger (11) and the cold water heat exchanger (6) and are used for controlling the communication between the intermediate heat exchanger (11) and the hot water heat exchanger (7) or the communication between the intermediate heat exchanger (11) and the cold water heat exchanger (6).
2. An air conditioning assembly according to claim 1, wherein the valve assembly comprises:
a first on-off valve (14) located on the pipeline between the second inlet (113) and the chilled water inlet;
a second on-off valve (12) located on the line between the second outlet (114) and the second connection point;
a third on/off valve (15) located on the pipeline between the second inlet (113) and the hot water inlet;
a fourth switching valve (13) located in the line between the second outlet (114) and the first connection point.
3. The air conditioning unit according to claim 1, wherein a port D of the four-way valve (2) is connected to a discharge port of the compressor (1), a port S of the four-way valve (2) is connected to a suction port of the compressor (1), a port E of the four-way valve (2) is connected to a refrigerant inlet of the hot water heat exchanger (7), and a port C of the four-way valve (2) is connected to a refrigerant inlet of the cold water heat exchanger (6);
the air conditioning unit further includes: and one end of the third heat exchanger (3) is connected with the port C of the four-way valve (2), and the other end of the third heat exchanger is connected with a third connection point arranged between a refrigerant inlet of the cold water heat exchanger (6) and the first outlet (112).
4. The air conditioning assembly as set forth in claim 3, further comprising:
the first check valve (8) is positioned on a pipeline between an S port of the four-way valve (2) and a suction port of the compressor (1) and is used for preventing a refrigerant of the suction port of the compressor (1) from flowing back to the S port of the four-way valve (2); a fourth connecting point is arranged on a pipeline between the first one-way valve (8) and the suction port of the compressor (1), and the fourth connecting point is connected with a refrigerant outlet of the cold water heat exchanger (6);
and the second one-way valve (9) is positioned on a pipeline between the fourth connecting point and the refrigerant outlet of the cold water heat exchanger (6) and is used for preventing the refrigerant of the fourth connecting point from flowing back to the refrigerant outlet of the cold water heat exchanger (6).
5. The air conditioning assembly as set forth in claim 3, further comprising:
and the first electronic expansion valve (4) is positioned on a pipeline between the third connecting point and a refrigerant inlet of the cold water heat exchanger (6).
6. Air conditioning assembly according to claim 5,
the valve assembly further comprises: the fifth switch valve (10) is positioned on a pipeline between the first inlet (111) and the refrigerant outlet of the hot water heat exchanger (7); a fifth connection point is further arranged on a pipeline between the fifth switch valve (10) and a refrigerant outlet of the hot water heat exchanger (7), and a sixth connection point is further arranged on a pipeline between the third connection point and the first electronic expansion valve (4);
the air conditioning unit further includes: and one end of the second electronic expansion valve (5) is connected with the fifth connecting point, and the other end of the second electronic expansion valve is connected with the sixth connecting point.
7. An air conditioning unit control method applied to the air conditioning unit according to any one of claims 1 to 6, characterized by comprising:
detecting an operation load parameter of the air conditioning unit;
determining the operation mode of the air conditioning unit according to the operation load parameter; wherein the operation modes at least comprise: a cooling mode, a heating mode, a forced cooling mode and a forced hot mode;
and controlling the operation of the air conditioning unit according to the operation mode.
8. The method of claim 7, wherein the operating mode further comprises at least: meanwhile, a refrigeration and heating mode is adopted; before the operation load parameter of the air conditioning unit is detected, the method further comprises the following steps:
and detecting the current operation mode of the air conditioning unit, and triggering the detection of the operation load parameters of the air conditioning unit when the current operation mode is the simultaneous cooling and heating mode.
9. The method of claim 7, wherein the operational load parameters include a rate of change of hot water temperature and a rate of change of cold water temperature; determining the operation mode of the air conditioning unit according to the operation load parameter, wherein the operation mode comprises the following steps:
if the cold water temperature change rate is greater than a preset maximum cold water temperature change rate and the cold water temperature change rate is greater than the hot water temperature change rate within continuous first preset time, determining that the operation mode is a forced cooling mode;
if the hot water temperature change rate is greater than a preset maximum hot water temperature change rate and the hot water temperature change rate is greater than the cold water temperature change rate within a second continuous preset time, determining that the operation mode is a forced hot mode;
determining that the operation mode is the cooling mode or the heating mode if the operation mode is not the strong cooling mode or the forced heating mode.
10. The method of claim 9,
after determining that the operation mode is the strong cooling mode, the method further comprises the following steps: if the cold water temperature change rate is less than or equal to a preset minimum cold water temperature change rate within the first preset time, the forced cooling mode is exited;
after determining that the operation mode is the forced hot mode, the method further comprises the following steps: and if the change rate of the hot water temperature is less than or equal to the preset minimum change rate of the hot water temperature within the second preset time, the forced hot mode is exited.
11. The method of claim 8, wherein controlling operation of the air conditioning unit according to the operating mode comprises:
when the operation mode is the forced cooling mode, controlling a first electromagnetic valve and a second electromagnetic valve to be closed, a third electromagnetic valve and a fourth electromagnetic valve to be opened, a fifth electromagnetic valve to be opened, a first electronic expansion valve to be opened and a second electronic expansion valve to be closed;
when the operation mode is the forced hot mode, controlling the first electromagnetic valve and the second electromagnetic valve to be opened, the third electromagnetic valve and the fourth electromagnetic valve to be closed, the fifth electromagnetic valve to be opened, the first electronic expansion valve to be opened and the second electronic expansion valve to be closed;
when the operation mode is the refrigeration mode, controlling the first solenoid valve, the second solenoid valve, the third solenoid valve, the fourth solenoid valve and the fifth solenoid valve to be closed, opening the first electronic expansion valve and closing the second electronic expansion valve;
when the operation mode is the heating mode, controlling the first solenoid valve, the second solenoid valve, the third solenoid valve, the fourth solenoid valve and the fifth solenoid valve to be closed, the first electronic expansion valve to be closed and the second electronic expansion valve to be opened;
and when the operation mode is the simultaneous cooling and heating mode, the first electromagnetic valve, the second electromagnetic valve, the third electromagnetic valve, the fourth electromagnetic valve and the fifth electromagnetic valve are controlled to be closed, the first electronic expansion valve is opened, and the second electronic expansion valve is opened.
12. A storage medium containing computer-executable instructions for performing the air conditioning pack control method of any of claims 7 to 11 when executed by a computer processor.
CN202111081418.6A 2021-09-15 2021-09-15 Air conditioning unit and control method thereof Pending CN113654265A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
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Application Number Priority Date Filing Date Title
CN202111081418.6A CN113654265A (en) 2021-09-15 2021-09-15 Air conditioning unit and control method thereof

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114110978A (en) * 2021-11-22 2022-03-01 珠海格力节能环保制冷技术研究中心有限公司 Air conditioning system, control method and air conditioning unit
CN114413357A (en) * 2021-12-22 2022-04-29 珠海格力电器股份有限公司 Parameter determination method for four-pipe system for air conditioner and related equipment

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114110978A (en) * 2021-11-22 2022-03-01 珠海格力节能环保制冷技术研究中心有限公司 Air conditioning system, control method and air conditioning unit
CN114413357A (en) * 2021-12-22 2022-04-29 珠海格力电器股份有限公司 Parameter determination method for four-pipe system for air conditioner and related equipment
CN114413357B (en) * 2021-12-22 2023-05-16 珠海格力电器股份有限公司 Parameter determining method and related equipment for four-pipe system for air conditioner

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