CN113669939A - Air conditioning system and control method - Google Patents
Air conditioning system and control method Download PDFInfo
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- CN113669939A CN113669939A CN202110931361.8A CN202110931361A CN113669939A CN 113669939 A CN113669939 A CN 113669939A CN 202110931361 A CN202110931361 A CN 202110931361A CN 113669939 A CN113669939 A CN 113669939A
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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
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/20709—Modifications to facilitate cooling, ventilating, or heating for server racks or cabinets; for data centers, e.g. 19-inch computer racks
- H05K7/208—Liquid cooling with phase change
- H05K7/20827—Liquid cooling with phase change within rooms for removing heat from cabinets, e.g. air conditioning devices
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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
- F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
- F25B2313/023—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple indoor units
- F25B2313/0233—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple indoor units in parallel arrangements
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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
- F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
- F25B2313/023—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple indoor units
- F25B2313/0233—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple indoor units in parallel arrangements
- F25B2313/02331—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple indoor units in parallel arrangements during cooling
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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
- F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
- F25B2313/023—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple indoor units
- F25B2313/0233—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple indoor units in parallel arrangements
- F25B2313/02333—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple indoor units in parallel arrangements during dehumidification
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- Mechanical Engineering (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention relates to the technical field of air conditioners, in particular to an air conditioning system and a control method. This air conditioning system includes: compressor, outdoor heat exchanger, first expansion valve and the indoor heat exchanger subassembly that is linked together in proper order, indoor heat exchanger subassembly includes: a first indoor heat exchanger and a second indoor heat exchanger which are arranged between the first expansion valve and the compressor in parallel; the first end of the first indoor heat exchanger is communicated with the first end of the second indoor heat exchanger through a second expansion valve, and the second end of the first indoor heat exchanger is communicated with the second end of the second indoor heat exchanger through a first electromagnetic valve; the second end of the second indoor heat exchanger is communicated with the second end of the outdoor heat exchanger through a second electromagnetic valve; the first expansion valve is communicated with the first end of the second indoor heat exchanger through a first one-way valve; in summary, the invention adopts the switch combination between the electromagnetic valve and the expansion valve, and can realize normal refrigeration operation and constant temperature dehumidification.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to an air conditioning system and a control method.
Background
At present, in the field of machine room air conditioning, a variable frequency air conditioning system can adjust the refrigerating capacity output of a refrigerating unit according to the heat load of a data center, so that load matching is realized, and the constant temperature and humidity requirements of a data machine room are met. However, since the data center has high requirements for indoor temperature and humidity accuracy, a room air conditioner requiring cooling output throughout the year needs to frequently cope with the fluctuation of heat load and humidity load.
The problem that the indoor humidity is too high or too low easily occurs when the humidity of the data center is controlled improperly, condensed water is easily generated when the humidity is too high, static electricity is easily generated when the humidity is too low, and the safe operation of data center equipment can be seriously threatened under the two conditions; in the south, cold weather is very easy to occur, the indoor humidity of a data center is too high due to the enclosing structure of the data center or moisture invading through doors and windows, and the dehumidification capacity of a machine room air conditioner needs to be increased, so that the evaporation temperature is too low, and the indoor air supply temperature fluctuation is too large; particularly, under the condition of high humidity and low load of a data center, the operation of the air conditioner in the machine room has a contradiction phenomenon: the unit is matched with low-load output, the dehumidification capacity is reduced, and the indoor wet load cannot be reduced, namely the problem of light-load dehumidification is solved; increasing the dehumidification capacity meets the requirement of indoor humidity, which can exceed the requirement of heat load, resulting in too large indoor temperature drop.
Disclosure of Invention
The invention aims to provide an air conditioning system and a control method, and aims to solve the technical problem that the air conditioning system in the prior art cannot realize constant-temperature dehumidification indoors.
Technical scheme (I)
To achieve the above object, a first aspect of the present invention provides an air conditioning system comprising: compressor, outdoor heat exchanger, first expansion valve and the indoor heat exchanger subassembly that is linked together in proper order, the indoor heat exchanger subassembly includes: and the first indoor heat exchanger and the second indoor heat exchanger are arranged between the first expansion valve and the compressor in parallel.
The first end of the first indoor heat exchanger is communicated with the first end of the second indoor heat exchanger through a second expansion valve, and the second end of the first indoor heat exchanger is communicated with the second end of the second indoor heat exchanger through a first electromagnetic valve;
the second end of the second indoor heat exchanger is communicated with the second end of the outdoor heat exchanger through a second electromagnetic valve; and the first expansion valve is communicated with the first end of the second indoor heat exchanger through a first one-way valve.
As one of the alternatives of the technical scheme, the compressor is communicated with the outdoor heat exchanger through a four-way valve.
As an alternative of the present technical solution, the compressor is further communicated with the second indoor heat exchanger through a second check valve.
As one of the alternatives of the present technical solution, the light-load dehumidification and refrigeration system further includes an inner fan facing the indoor heat exchanger assembly, and wind generated by the inner fan flows to the second indoor heat exchanger through the first indoor heat exchanger.
As one of the alternatives of the technical scheme, the light-load dehumidification cooling system further comprises an external fan facing the outdoor heat exchanger.
In order to achieve the above object, a second aspect of the present invention provides an air conditioning system control method, including:
in a constant-temperature dehumidification mode, the first electromagnetic valve is closed, and the second electromagnetic valve is opened, so that the first indoor unit heat exchanger is used as an evaporator and used for refrigerating and dehumidifying indoor air; the second indoor heat exchanger is used as an outdoor heat exchanger and operates in parallel with the outdoor evaporator, is used as an outdoor heat exchanger of the air conditioning system, and is used for secondarily heating cold air from the first indoor heat exchanger;
and in the refrigeration mode, the first electromagnetic valve is opened, and the second electromagnetic valve is closed, so that the first indoor heat exchanger and the second indoor heat exchanger run in parallel to serve as an evaporator of the air conditioning system.
As one of the alternatives of the present technical solution, the method further includes: and in the heating mode, the second electromagnetic valve is closed, the port D of the four-way valve is controlled to be communicated with the port E, and the port C of the four-way valve is controlled to be communicated with the port S, so that the first indoor heat exchanger and the second indoor heat exchanger run in parallel to serve as a condenser of the air conditioning system.
As one of the alternatives of the technical scheme, in the constant-temperature dehumidification mode, the first electromagnetic valve is closed, and the second electromagnetic valve is opened, so that the first indoor unit heat exchanger is used as an evaporator and is used for refrigerating and dehumidifying indoor air; the second indoor heat exchanger is used as an outdoor heat exchanger and operates in parallel with the outdoor evaporator, is used as an outdoor heat exchanger of the air conditioning system, and is used for carrying out secondary heating on cold air from the first indoor heat exchanger, and the steps specifically comprise:
closing the first electromagnetic valve, opening the second electromagnetic valve to make a part of high-temperature and high-pressure refrigerant gas discharged by the compressor enter the outdoor heat exchanger for condensation and liquefaction and then become high-pressure and medium-temperature refrigerant liquid, and then throttling, depressurizing and cooling by the first expansion valve; the other part of high-temperature and high-pressure refrigerant gas enters a second indoor heat exchanger through a second electromagnetic valve for condensation and liquefaction so as to perform indoor heating operation, is throttled, depressurized and cooled through a second expansion valve, is merged with the refrigerant throttled by a first expansion valve and then enters a first indoor heat exchanger for evaporation, so that the indoor air is refrigerated and dehumidified.
As one alternative of this technical solution, in the cooling mode, the opening of the first electromagnetic valve and the closing of the second electromagnetic valve allow the first indoor heat exchanger and the second indoor heat exchanger to operate in parallel, and the step of serving as the evaporator of the air conditioning system includes:
the first electromagnetic valve is opened, the second electromagnetic valve is closed, so that high-temperature and high-pressure refrigerant gas discharged by the compressor enters the outdoor heat exchanger to be condensed and liquefied and then is changed into high-pressure and medium-temperature refrigerant liquid, then the high-pressure and high-temperature refrigerant liquid is throttled, decompressed and cooled by the first expansion valve, at the moment, one part of the refrigerant enters the first indoor heat exchanger to be evaporated and vaporized, and the other part of the refrigerant enters the second indoor heat exchanger to be evaporated and vaporized by the first one-way valve, so that indoor air is refrigerated.
As one of the alternatives of the present technical solution, in the heating mode, the second electromagnetic valve is closed, and the port D of the four-way valve is controlled to be communicated with the port E, and the port C is controlled to be communicated with the port S, so that the first indoor heat exchanger and the second indoor heat exchanger operate in parallel, and the step of serving as the condenser of the air conditioning system specifically includes:
closing the second electromagnetic valve, controlling the connection between the port D and the port E of the four-way valve and the connection between the port C and the port S, so that part of the high-temperature and high-pressure refrigerant gas discharged by the compressor enters the first indoor heat exchanger for condensation and liquefaction; the other part of the refrigerant enters a second indoor heat exchanger through a second one-way valve for condensation and liquefaction, then enters a second expansion valve for throttling, pressure reducing and temperature reducing, then is converged with the liquid refrigerant flowing out through the first indoor heat exchanger, then enters a first expansion valve for throttling, pressure reducing and temperature reducing, and finally enters an outdoor heat exchanger for evaporation and vaporization and then returns to a compressor.
As one of the alternatives of the present technical solution, the method further includes: in the constant temperature dehumidification mode, if the current indoor heat load value is detected to be larger than the preset heat load value or the current indoor cold load value is detected to be larger than the preset cold load value, the opening degree value of the first expansion valve and the opening degree value of the second expansion valve are determined so as to redistribute the refrigerant quantity flowing through the second indoor heat exchanger and the refrigerant quantity flowing through the outdoor heat exchanger.
As one of the alternatives of the present technical solution, the method further includes: and if the absolute value of the difference value between the humidity of the air outlet of the current air conditioning system and the humidity of the air return inlet is detected to be far larger than the upper limit value of the preset humidity value range, controlling the first expansion valve to be closed so as to carry out the maximum indoor dehumidification operation.
As one of the alternatives of the present technical solution, the method further includes: and if the absolute value of the difference value between the humidity of the air outlet of the current air conditioning system and the humidity of the air return inlet is detected to be within the preset humidity value range, the first electromagnetic valve is opened, and the second electromagnetic valve is closed, so that the current mode is switched to the refrigeration mode.
(II) advantageous effects
Compared with the prior art, the invention has the following beneficial effects:
the invention provides an air conditioning system and a control method, wherein the air conditioning system comprises: the method comprises the following steps: compressor, outdoor heat exchanger, first expansion valve and the indoor heat exchanger subassembly that is linked together in proper order, the indoor heat exchanger subassembly includes: a first indoor heat exchanger and a second indoor heat exchanger arranged in parallel between the first expansion valve and the compressor; the first end of the first indoor heat exchanger is communicated with the first end of the second indoor heat exchanger through a second expansion valve, and the second end of the first indoor heat exchanger is communicated with the second end of the second indoor heat exchanger through a first electromagnetic valve; the second end of the second indoor heat exchanger is communicated with the second end of the outdoor heat exchanger through a second electromagnetic valve; the first expansion valve is communicated with the first end of the second indoor heat exchanger through a first one-way valve; in summary, on one hand, the normal refrigeration operation and constant temperature dehumidification can be realized by adopting the switch combination between the electromagnetic valve and the expansion valve; on the other hand, through the switching of different modes, can realize that the second indoor heat exchanger is connected in parallel operation with first indoor heat exchanger, outdoor heat exchanger respectively to effectively reduce the flow resistance of refrigerant, promote heat exchange efficiency.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious for a person skilled in the art that other drawings can be obtained according to the drawings without inventive exercise, wherein:
fig. 1 is a schematic structural diagram showing an air conditioning system according to one embodiment of the present invention;
fig. 2 is a schematic structural view showing an air conditioning system according to another embodiment of the present invention.
In the figure: 1. a compressor; 2. an outdoor heat exchanger; 3. a first expansion valve; 4. a first indoor heat exchanger; 5. a second indoor heat exchanger; 6. a second expansion valve; 7. a first solenoid valve; 8. a second solenoid valve; 9. a second one-way valve; 10. a four-way valve; 11. a first check valve; 12. an inner fan; 13. an outer fan.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
The invention is described in further detail below with reference to the following figures and detailed description:
in order to solve the technical problem that the air conditioning system in the prior art cannot realize constant temperature dehumidification indoors, as shown in fig. 1 and 2, the invention provides an air conditioning system and a control method, comprising the following steps: the compressor 1, the outdoor heat exchanger 2, the first expansion valve 3, and the indoor heat exchanger assembly, which are sequentially communicated, preferably, further include an external fan 13 facing the outdoor heat exchanger 2.
The indoor heat exchanger assembly includes: a first indoor heat exchanger 4 and a second indoor heat exchanger 5 disposed in parallel between the first expansion valve 3 and the compressor 1, in a specific embodiment, the first indoor heat exchanger 4 and the second indoor heat exchanger 5 may be two ends used in the same space, and preferably, a one-driving-two or one-driving-multiple household central air conditioner may be used; further, an inner fan 12 facing the indoor heat exchanger assembly is further included, and wind emitted by the inner fan 12 flows to the second indoor heat exchanger 5 through the first indoor heat exchanger 4.
A first end of the first indoor heat exchanger 4 is communicated with a first end of the second indoor heat exchanger 5 through a second expansion valve 6, and a second end of the first indoor heat exchanger 4 is communicated with a second end of the second indoor heat exchanger 5 through a first electromagnetic valve 7;
the second end of the second indoor heat exchanger 5 is communicated with the second end of the outdoor heat exchanger 2 through a second electromagnetic valve 8; the first expansion valve 3 communicates with a first end of the second indoor heat exchanger 5 through a first check valve 11.
In a constant-temperature dehumidification mode, the first electromagnetic valve 7 is closed, and the second electromagnetic valve 8 is opened, so that the first indoor unit heat exchanger is used as an evaporator and used for refrigerating and dehumidifying indoor air; the second indoor heat exchanger 5 is used as the outdoor heat exchanger 2 and operates in parallel with the outdoor evaporator, is used as the outdoor heat exchanger 2 of the air conditioning system, and is used for carrying out secondary heating on cold air from the first indoor heat exchanger 4; through the matching of the structures, constant-temperature dehumidification can be realized on the premise of no additional electricity consumption of electric heating, so that energy is effectively saved; in the cooling mode, the first electromagnetic valve 7 is opened, and the second electromagnetic valve 8 is closed, so that the first indoor heat exchanger 4 and the second indoor heat exchanger 5 run in parallel to be used as an evaporator of the air conditioning system; in summary, on one hand, the normal refrigeration operation and constant temperature dehumidification can be realized by adopting the switch combination between the electromagnetic valve and the expansion valve; on the other hand, the second indoor heat exchanger 5 can be respectively connected with the first indoor heat exchanger 4 and the outdoor heat exchanger 2 in parallel to operate through switching of different modes, so that the flow resistance of the refrigerant is effectively reduced, and the heat exchange efficiency is improved; in addition, as shown in fig. 1, in the present embodiment, by eliminating the design of the four-way valve 10, on one hand, heat leakage between cold and hot refrigerant liquids can be effectively avoided, and on the other hand, internal leakage of the liquid refrigerant in the four-way valve 10 can be effectively avoided; in addition, because the switch states of the first electromagnetic valve 7 and the second electromagnetic valve 8 are mutually exclusive, the switch states of the two electromagnetic valves can be controlled by only one relay, the cost of the controller is saved, and the control function is simplified.
According to an embodiment of the present invention, in order to realize the heat pump function, as shown in fig. 2, the compressor 1 is further communicated with the outdoor heat exchanger 2 through a four-way valve 10, and the compressor 1 is further communicated with the second indoor heat exchanger 5 through a second one-way valve 9; specifically, as shown in fig. 2, in the present embodiment, a manner of connecting the second check valves 9 in parallel to two ends of the first electromagnetic valve 7 is adopted to realize bidirectional circulation of the electromagnetic valve, so as to avoid a problem of high cost caused by providing the electromagnetic valve for bidirectional circulation, and when the present embodiment is in the heating mode, a part of the high-temperature and high-pressure refrigerant discharged from the compressor 1 enters the second indoor heat exchanger 5 through the second check valve 9, and another part of the high-temperature and high-pressure refrigerant directly enters the first evaporator connected in parallel to the second indoor heat exchanger 5.
When the air conditioning system shown in fig. 1 is applied, if it is detected that the user switches to the constant temperature dehumidification mode, the first electromagnetic valve 7 is closed, and the second electromagnetic valve 8 is opened, so that the first indoor unit heat exchanger is used as an evaporator for performing cooling and dehumidification operations on indoor air; the second indoor heat exchanger 5 is used as the outdoor heat exchanger 2 and operates in parallel with the outdoor evaporator, is used as the outdoor heat exchanger 2 of the air conditioning system, and is used for carrying out secondary heating on cold air from the first indoor heat exchanger 4; the first expansion valve 3 and the second expansion valve 6 can automatically adjust the opening according to the control logic of the mode, so that the dehumidification capacity can be quickly adjusted, and even the outer fan 13 can be closed to save electric energy; the refrigerant flow process is as follows, wherein the middle brackets indicate parallel branches:
the specific working process is as follows: when the first electromagnetic valve 7 is closed and the second electromagnetic valve 8 is opened, the exhaust port of the compressor 1 discharges high-temperature and high-pressure refrigerant gas, wherein a part of the high-temperature and high-pressure refrigerant gas enters the outdoor heat exchanger 2 to be condensed and liquefied to be changed into high-pressure and medium-temperature refrigerant liquid, and then the high-temperature and high-pressure refrigerant liquid is throttled, depressurized and cooled by the first expansion valve 3; the other part of high-temperature and high-pressure refrigerant gas enters a second indoor heat exchanger 5 through a second electromagnetic valve 8 for condensation and liquefaction so as to carry out heating operation indoors, is throttled, depressurized and cooled through a second expansion valve 6, is converged with the refrigerant throttled by a first expansion valve 3 and then enters a first indoor heat exchanger 4 for evaporation so as to refrigerate and dehumidify the indoor air, and finally returns to the compressor 1; if the absolute value of the difference value between the humidity of the air outlet of the current air conditioning system and the humidity of the air return inlet is detected to be far larger than the upper limit value of the preset humidity value range, controlling the first expansion valve 3 to be closed so as to carry out the maximum indoor dehumidification operation; in conclusion, the maximum dehumidification can be realized through the structural matching, and meanwhile, the fluctuation of the indoor air temperature is not large, so that the light-load constant-temperature dehumidification effect is realized.
When the air conditioning system shown in fig. 2 is applied, if it is detected that the user switches to the constant temperature dehumidification mode, the first electromagnetic valve 7 is closed, the second electromagnetic valve 8 is opened, and the port D of the four-way valve 10 is controlled to be communicated with the port C and the port E is controlled to be communicated with the port S, so that the first indoor unit heat exchanger is used as an evaporator for performing cooling and dehumidification operations on indoor air; the second indoor heat exchanger 5 is operated as the outdoor heat exchanger 2 in parallel with the outdoor evaporator, as the outdoor heat exchanger 2 of the air conditioning system, and is used for secondarily heating the cold air from the first indoor heat exchanger 4, wherein the first expansion valve 3 and the second expansion valve 6 can automatically adjust the opening degree according to the control logic of the present mode, the refrigerant flowing process is as follows, wherein, the brackets in the middle indicate the parallel branch:
the specific working process is as follows: when the first electromagnetic valve 7 is closed and the second electromagnetic valve 8 is opened, the exhaust port of the compressor 1 discharges high-temperature and high-pressure refrigerant gas, wherein a part of the high-temperature and high-pressure refrigerant gas enters the outdoor heat exchanger 2 to be condensed and liquefied to be changed into high-pressure and medium-temperature refrigerant liquid, and then the high-temperature and high-pressure refrigerant liquid is throttled, depressurized and cooled by the first expansion valve 3; the other part of the high-temperature and high-pressure refrigerant gas enters the second indoor heat exchanger 5 through the second electromagnetic valve 8 to be condensed and liquefied so as to heat the indoor space, is throttled, depressurized and cooled through the second expansion valve 6, is merged with the refrigerant throttled by the first expansion valve 3, enters the first indoor heat exchanger 4 to be evaporated and vaporized so as to refrigerate and dehumidify the indoor air, and finally returns to the compressor 1.
According to an embodiment of the invention, the method further comprises: in the constant temperature dehumidification mode, if it is detected that the current indoor heat load value is greater than the preset heat load value or the current indoor cold load value is greater than the preset cold load value, the opening degree value of the first expansion valve 3 and the opening degree value of the second expansion valve 6 are determined to redistribute the amount of the refrigerant flowing through the second indoor heat exchanger 5 and the amount of the refrigerant flowing through the outdoor heat exchanger 2.
Specifically, if it is detected that the current indoor thermal load value is greater than the preset thermal load value, the opening degree of the second expansion valve 6 is decreased, so that the high-temperature and high-pressure refrigerant gas flowing through the second indoor heat exchanger 5 is decreased, and the amount of reheating to the indoor space is decreased, and at this time, the cold load generated by the first indoor heat exchanger 4 is appropriately increased, so that the difference value between the current indoor thermal load value and the preset thermal load value is matched; in summary, with the design of the present invention, the amount of refrigerant flowing through the second indoor heat exchanger 5 and the amount of refrigerant flowing through the outdoor heat exchanger 2 can be redistributed by adjusting the opening degree of the first expansion valve 3 and the opening degree of the second expansion valve 6, thereby adjusting the amount of reheat generated by the second indoor heat exchanger 5.
According to an embodiment of the present invention, if it is detected that the absolute value of the difference between the current outlet humidity and the current return air humidity of the air conditioning system falls within the preset humidity range, the first solenoid valve 7 is opened, and the second solenoid valve 8 is closed, so as to switch the current mode to the cooling mode.
The working process of the specific refrigeration mode is as follows:
when the air conditioning system shown in fig. 1 is applied, the first electromagnetic valve 7 is opened, and the second electromagnetic valve 8 is closed, so that the first indoor heat exchanger 4 and the second indoor heat exchanger 5 operate in parallel to serve as evaporators of the air conditioning system, and the first expansion valve 3 and the second expansion valve 6 can automatically adjust the opening degrees according to the control logic of the present mode; the refrigerant flow process is as follows, wherein the middle brackets indicate parallel branches:
the specific working process is as follows: after the first electromagnetic valve 7 is opened and the second electromagnetic valve 8 is closed, the high-temperature and high-pressure refrigerant gas is discharged from the exhaust port of the compressor 1, then the high-temperature and high-pressure refrigerant gas enters the outdoor heat exchanger 2 to be condensed and liquefied to become high-pressure and medium-temperature refrigerant liquid, and then the high-pressure and medium-temperature refrigerant liquid is throttled, decompressed and cooled by the first expansion valve 3, at the moment, a part of refrigerant enters the first indoor heat exchanger 4 to be evaporated and vaporized, and the other part of refrigerant enters the second indoor heat exchanger 5 to be evaporated and vaporized by the first check valve 11 to refrigerate the indoor air and finally returns to the compressor 1.
When the air conditioning system shown in fig. 2 is applied, the first solenoid valve 7 is opened, the second solenoid valve 8 is closed, and the port D of the four-way valve 10 is controlled to be communicated with the port C, and the port E is controlled to be communicated with the port S, so that the first indoor heat exchanger 4 and the second indoor heat exchanger 5 run in parallel to serve as evaporators of the air conditioning system, and the first expansion valve 3 and the second expansion valve 6 can automatically adjust the opening degrees according to the control logic of the present mode; the refrigerant flow process is as follows, wherein the middle brackets indicate parallel branches:
the specific working process is as follows: after the first electromagnetic valve 7 is opened and the second electromagnetic valve 8 is closed, the high-temperature and high-pressure refrigerant gas is discharged from the exhaust port of the compressor 1, then the high-temperature and high-pressure refrigerant gas enters the outdoor heat exchanger 2 to be condensed and liquefied to become high-pressure and medium-temperature refrigerant liquid, and then the high-pressure and medium-temperature refrigerant liquid is throttled, decompressed and cooled by the first expansion valve 3, at the moment, a part of refrigerant enters the first indoor heat exchanger 4 to be evaporated and vaporized, and the other part of refrigerant enters the second indoor heat exchanger 5 to be evaporated and vaporized by the first check valve 11 to refrigerate the indoor air and finally returns to the compressor 1.
According to an embodiment of the invention, the method further comprises: in the heating mode, the second electromagnetic valve 8 is closed, the port D of the four-way valve 10 is controlled to be communicated with the port E, and the port C is controlled to be communicated with the port S, so that the first indoor heat exchanger 4 and the second indoor heat exchanger 5 run in parallel to serve as a condenser of the air conditioning system, wherein the state of the electromagnetic valve A is irrelevant, and preferably, the first electromagnetic valve 7 is closed, so that electric energy is saved, and the opening degrees of the first expansion valve 3 and the second expansion valve 6 are automatically adjusted according to the control logic of the mode; the refrigerant flow process is as follows, wherein the middle brackets indicate parallel branches:
the specific working process is as follows: closing the second electromagnetic valve 8, controlling the connection between the port D and the port E of the four-way valve 10, and controlling the connection between the port C and the port S, and then allowing a part of the high-temperature and high-pressure refrigerant gas discharged from the compressor 1 to enter the first indoor heat exchanger 4 for condensation and liquefaction; the other part of the refrigerant enters the second indoor heat exchanger 5 through the second one-way valve 9 for condensation and liquefaction, enters the second expansion valve 6 for throttling, pressure reducing and temperature reducing, then joins with the liquid refrigerant flowing out through the first indoor heat exchanger 4, enters the first expansion valve 3 for throttling, pressure reducing and temperature reducing, finally enters the outdoor heat exchanger 2 for evaporation and vaporization, and then returns to the compressor 1.
The embodiments in the present description are all described in a progressive manner, and some of the embodiments are mainly described as different from other embodiments, and the same and similar parts among the embodiments can be referred to each other.
It is noted that in the description and claims of the present invention and in the above-mentioned figures, relational terms such as "first" and "second", and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein.
Also, the terms "comprises," "comprising," and "having," as well as any variations thereof or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements explicitly listed, but may include other steps or elements not explicitly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
The foregoing are merely exemplary embodiments of the present invention, which enable those skilled in the art to understand or practice the present invention. Various modifications and changes to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (13)
1. An air conditioning system, comprising: compressor (1), outdoor heat exchanger (2), first expansion valve (3) and indoor heat exchanger subassembly that communicate in proper order, indoor heat exchanger subassembly includes: a first indoor heat exchanger (4) and a second indoor heat exchanger (5) which are arranged in parallel between the first expansion valve (3) and the compressor (1);
a first end of the first indoor heat exchanger (4) is communicated with a first end of the second indoor heat exchanger (5) through a second expansion valve (6), and a second end of the first indoor heat exchanger (4) is communicated with a second end of the second indoor heat exchanger (5) through a first electromagnetic valve (7);
the second end of the second indoor heat exchanger (5) is communicated with the second end of the outdoor heat exchanger (2) through a second electromagnetic valve (8); the first expansion valve (3) is communicated with the first end of the second indoor heat exchanger (5) through a first one-way valve (11).
2. Air conditioning system according to claim 1, characterized in that the compressor (1) is also in communication with the outdoor heat exchanger (2) through a four-way valve (10).
3. Air conditioning system according to claim 2, characterized in that said compressor (1) is in communication with said second indoor heat exchanger (5) also through a second non-return valve (9).
4. The air conditioning system of claim 1, wherein the light load dehumidification refrigeration system further comprises an inner fan (12) facing the indoor heat exchanger assembly, the inner fan (12) emitting wind to the second indoor heat exchanger (5) via the first indoor heat exchanger (4).
5. Air conditioning system according to claim 4, characterized in that it further comprises an external fan (13) directed towards the outdoor heat exchanger (2).
6. A method of controlling an air conditioning system, the method comprising:
in a constant-temperature dehumidification mode, closing the first electromagnetic valve (7), and opening the second electromagnetic valve (8) to use the first indoor unit heat exchanger as an evaporator for refrigerating and dehumidifying indoor air; the second indoor heat exchanger (5) is used as an outdoor heat exchanger (2) and operates in parallel with an outdoor evaporator to serve as the outdoor heat exchanger (2) of the air conditioning system, and is used for secondarily heating cold air from the first indoor heat exchanger (4);
and in the refrigeration mode, the first electromagnetic valve (7) is opened, and the second electromagnetic valve (8) is closed, so that the first indoor heat exchanger (4) and the second indoor heat exchanger (5) are operated in parallel to be used as an evaporator of the air conditioning system.
7. The control method of an air conditioning system according to claim 6, characterized by further comprising: and in the heating mode, the second electromagnetic valve (8) is closed, the port D of the four-way valve (10) is controlled to be communicated with the port E, and the port C of the four-way valve is controlled to be communicated with the port S, so that the first indoor heat exchanger (4) and the second indoor heat exchanger (5) run in parallel to serve as a condenser of the air conditioning system.
8. The control method of the air conditioning system according to claim 6, characterized in that in the constant temperature dehumidification mode, the first solenoid valve (7) is closed, and the second solenoid valve (8) is opened to use the first indoor unit heat exchanger as an evaporator for performing cooling and dehumidification operations on indoor air; the second indoor heat exchanger (5) is used as an outdoor heat exchanger (2) and operates in parallel with an outdoor evaporator, is used as the outdoor heat exchanger (2) of the air conditioning system, and is used for carrying out secondary heating on cold air from the first indoor heat exchanger (4) and specifically comprises the following steps:
closing the first electromagnetic valve (7), opening the second electromagnetic valve (8) to ensure that part of high-temperature and high-pressure refrigerant gas discharged by the compressor (1) enters the outdoor heat exchanger (2) to be condensed and liquefied to be changed into high-pressure and medium-temperature refrigerant liquid, and then throttling, depressurizing and cooling by the first expansion valve (3); the other part of high-temperature and high-pressure refrigerant gas enters a second indoor heat exchanger (5) through a second electromagnetic valve (8) for condensation and liquefaction so as to heat the indoor air, then is throttled, depressurized and cooled through a second expansion valve (6), is merged with the refrigerant throttled by a first expansion valve (3) and then enters a first indoor heat exchanger (4) for evaporation, so that the indoor air is refrigerated and dehumidified.
9. The control method of an air conditioning system according to claim 8, wherein in the cooling mode, the step of opening the first solenoid valve (7) and closing the second solenoid valve (8) to operate the first indoor heat exchanger (4) and the second indoor heat exchanger (5) in parallel comprises:
the method comprises the steps of opening a first electromagnetic valve (7), closing a second electromagnetic valve (8), enabling high-temperature and high-pressure refrigerant gas discharged by a compressor (1) to enter an outdoor heat exchanger (2) to be condensed and liquefied to be changed into high-pressure and medium-temperature refrigerant liquid, throttling, depressurizing and cooling by a first expansion valve (3), enabling a part of refrigerant to enter a first indoor heat exchanger (4) to be evaporated and vaporized, enabling the other part of refrigerant to enter a second indoor heat exchanger (5) to be evaporated and vaporized by a first one-way valve (11), and refrigerating indoor air.
10. The method for controlling an air conditioning system according to claim 7, wherein in the heating mode, the second solenoid valve (8) is closed, and the port D of the four-way valve (10) is controlled to be communicated with the port E, and the port C is controlled to be communicated with the port S, so that the first indoor heat exchanger (4) and the second indoor heat exchanger (5) are operated in parallel, and the step of serving as a condenser of the air conditioning system specifically comprises:
closing the second electromagnetic valve (8), controlling the connection between a port D and a port E of the four-way valve (10) and the connection between a port C and a port S, so that part of the high-temperature and high-pressure refrigerant gas discharged by the compressor (1) enters the first indoor heat exchanger (4) for condensation and liquefaction; the other part of the refrigerant enters a second indoor heat exchanger (5) through a second one-way valve (9) for condensation and liquefaction, then enters a second expansion valve (6) for throttling, pressure reducing and temperature reducing, then is merged with the liquid refrigerant flowing out through the first indoor heat exchanger (4), then enters a first expansion valve (3) for throttling, pressure reducing and temperature reducing, and finally enters an outdoor heat exchanger (2) for evaporation and vaporization and then returns to the compressor (1).
11. The control method of an air conditioning system according to claim 6, characterized by further comprising: and under the constant-temperature dehumidification mode, if the current indoor heat load value is detected to be larger than the preset heat load value or the current indoor cold load value is detected to be larger than the preset cold load value, determining the opening value of the first expansion valve (3) and the opening value of the second expansion valve (6) so as to redistribute the quantity of the refrigerant flowing through the second indoor heat exchanger (5) and the quantity of the refrigerant flowing through the outdoor heat exchanger (2).
12. The control method of an air conditioning system according to claim 6, characterized by further comprising: and if the absolute value of the difference value between the humidity of the air outlet of the current air conditioning system and the humidity of the air return inlet is detected to be far larger than the upper limit value of the preset humidity value range, controlling the first expansion valve (3) to be closed so as to carry out the maximum indoor dehumidification operation.
13. The control method of an air conditioning system according to claim 6, characterized by further comprising: and if the absolute value of the difference value between the air outlet humidity and the return air inlet humidity of the current air conditioning system is detected to be within the preset humidity value range, the first electromagnetic valve (7) is opened, and the second electromagnetic valve (8) is closed, so that the current mode is switched to the refrigeration mode.
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| CN202110931361.8A CN113669939A (en) | 2021-08-13 | 2021-08-13 | Air conditioning system and control method |
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