CN113531711B - Dehumidification reheating system and control method thereof - Google Patents
Dehumidification reheating system and control method thereof Download PDFInfo
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- CN113531711B CN113531711B CN202110855786.5A CN202110855786A CN113531711B CN 113531711 B CN113531711 B CN 113531711B CN 202110855786 A CN202110855786 A CN 202110855786A CN 113531711 B CN113531711 B CN 113531711B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
- F24F5/0007—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater cooling apparatus specially adapted for use in air-conditioning
- F24F5/001—Compression cycle type
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/65—Electronic processing for selecting an operating mode
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
- F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/88—Electrical aspects, e.g. circuits
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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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- 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
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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
- 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
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- Air Conditioning Control Device (AREA)
Abstract
The invention relates to a dehumidification reheating system and a control method thereof, wherein the dehumidification reheating system comprises an external machine, an internal machine and a branching box, wherein the external machine comprises a compressor, an oil separator, a four-way valve, an outdoor heat exchanger and a gas-liquid separator; a shell and tube heat exchanger is arranged in the branch box; the inner machine comprises a dehumidification heat exchanger and a reheating heat exchanger; the dehumidification heat exchanger and the reheating heat exchanger are arranged in parallel, and the reheating heat exchanger is close to the air outlet of the internal machine; the shell and tube heat exchanger is respectively connected with the oil separator, the indoor unit and the like, so that the temperature of a refrigerant flowing into the heat exchanger can be increased, the air outlet temperature during dehumidification and reheating is increased, the refrigeration cold feeling is avoided, and the user experience is improved. Moreover, a plurality of same or different types of internal machines can be connected, the requirements of different indoor environments are met, and the indoor air conditioner is very suitable for market popularization.
Description
Technical Field
The invention relates to an air conditioning system and a control method thereof, in particular to a dehumidification reheating system and a control method thereof.
Background
Along with the improvement of the living standard of people, the requirement of people on the comfort of the air conditioner is continuously improved, and the requirements of different people on the air outlet temperature of the air conditioner are different. Most of the existing dehumidification reheating systems are of three-pipe type, namely, an outer machine is connected with an inner machine through three pipelines, so that the inner machine is less in selectivity, inconvenient to install and increased in installation cost. Although there are some dehumidification reheating systems with two pipes, there are disadvantages of low reheating quantity, narrow control range of outlet air temperature, etc. Therefore, a dehumidification reheating system with multiple indoor units, convenient installation and wide air temperature control needs to be provided, and market requirements can be better met.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a dehumidification reheating system and a control method thereof, which can control the air outlet temperature in a larger range when a dehumidification reheating mode is operated, fully meet the requirements of users, ensure that the installation is more convenient, can adapt to different types of internal machines, and are suitable for popularization.
The technical scheme of the invention is as follows:
a dehumidification reheating system comprises an external machine, an internal machine and a branch box, wherein the external machine comprises a compressor, an oil separator, a four-way valve, an outdoor heat exchanger and a gas-liquid separator; a shell and tube heat exchanger is arranged in the branch box; the inner machine comprises a dehumidification heat exchanger and a reheating heat exchanger; the dehumidification heat exchanger and the reheating heat exchanger are arranged in parallel, and the reheating heat exchanger is close to the air outlet of the internal machine;
the air outlet and the air suction port of the compressor are respectively connected with the inlet of the oil separator and the outlet of the gas-liquid separator;
four ports of the four-way valve are respectively connected with the outlet of the oil separator, the first end of the outdoor heat exchanger, the inlet of the gas-liquid separator and the first end of the dehumidifying heat exchanger;
the second end of the dehumidification heat exchanger is connected with the second end of the reheating heat exchanger through a fifth electronic expansion valve;
the first end of the reheating heat exchanger is connected to the second end of the outdoor heat exchanger after sequentially passing through a third electronic expansion valve and a first electronic expansion valve;
and the f1 end of the shell and tube heat exchanger is connected to the outlet of the oil separator after passing through the second electronic expansion valve, the f2 end of the shell and tube heat exchanger is connected to a pipeline between the first electronic expansion valve and the third electronic expansion valve, the f3 end of the shell and tube heat exchanger is connected to the first end of the reheating heat exchanger after passing through the fourth electronic expansion valve, and the f4 end of the shell and tube heat exchanger is connected to a pipeline between the first electronic expansion valve and the third electronic expansion valve after passing through the one-way valve.
Further, the branch box is connected with the external machine and the internal machine through stop valves.
Further, the branch box is arranged inside or outside the outer unit.
Further, the inner machine is multiple; the structure of each internal machine and the connection mode of the internal machine and the branch box and the external machine are the same.
A control method of a dehumidification and reheating system comprises the following steps:
1) In the cooling mode, the air conditioner is operated,
the first electronic expansion valve is opened to control the flow; the second electronic expansion valve is closed; the third electronic expansion valve is opened to play a throttling role; the fourth electronic expansion valve is closed; the fifth electronic expansion valve is fully opened;
detecting an air outlet temperature T3 and an air inlet temperature T1 through temperature sensors arranged at two ends of a dehumidification heat exchanger, and calculating the superheat degree P = T3-T1 of an inner machine;
if P1 is more than or equal to P and less than or equal to P2, the opening of the third electronic expansion valve is unchanged; if P is larger than P2, the opening of the third electronic expansion valve is opened greatly, and the third electronic expansion valve is adjusted once every 1 minute; if P is more than P1, the opening of the third electronic expansion valve is small, and the third electronic expansion valve is adjusted once every 1 minute; wherein P1 and P2 are set superheat degrees, and P1 is less than P2;
2) A dehumidification reheating mode in which the refrigerant is dehumidified,
the first electronic expansion valve is opened to control the flow; the second electronic expansion valve is opened to play a role in limiting the flow; closing the third electronic expansion valve; the fourth electronic expansion valve is fully opened; the fifth electronic expansion valve is opened to play a throttling role;
detecting an outlet air temperature T3 and an inlet air temperature T1 through temperature sensors arranged at two ends of the dehumidifying heat exchanger, and calculating the superheat degree P = T3-T1 of the inner machine;
if P1 is more than or equal to P and less than or equal to P2, the opening of the fifth electronic expansion valve is unchanged; if P is larger than P2, the opening of the fifth electronic expansion valve is opened greatly, and the fifth electronic expansion valve is adjusted once every 1 minute; if P is more than P1, the opening of the fifth electronic expansion valve is reduced, and the fifth electronic expansion valve is adjusted once every 1 minute;
if T3 is less than or equal to W1, the opening degree of the second electronic expansion valve is increased; if T3 is larger than or equal to W2, the opening degree of the second electronic expansion valve is reduced; adjusting every 1 minute; wherein W1 and W2 are set temperatures, and W1 is less than W2;
3) In the heating mode, the heating device is arranged,
the first electronic expansion valve is opened to play a throttling role; the second electronic expansion valve is closed; the third electronic expansion valve is opened to a fixed opening degree; the fourth electronic expansion valve is closed; the fifth electronic expansion valve is fully opened;
detecting the exhaust temperature Tp through a temperature sensor arranged at the exhaust port of the compressor;
if Tp is more than or equal to W3 and less than or equal to W4, the first electronic expansion valve keeps the current opening unchanged; if Tp is larger than W4, the opening of the first electronic expansion valve is opened greatly; if Tp is less than W3, the opening of the first electronic expansion valve is small; every 1 minute; wherein W3 and W4 are set temperatures, and W3 is less than W4.
The invention has the beneficial effects that:
the invention can realize the dehumidification and reheating functions by connecting the two pipes, and is convenient to install and control. Moreover, when the dehumidification and reheating operation mode is adopted, the air outlet temperature can be controlled in a larger range, the requirements of users are fully met, meanwhile, a plurality of identical or different types of internal machines can be connected, the requirements of different indoor environments are met, and the dehumidification and reheating operation mode is very suitable for market popularization.
Drawings
FIG. 1 is a schematic diagram of the system architecture of the present invention.
Fig. 2 is a schematic view of the refrigerant flow in the cooling mode.
Fig. 3 is a schematic diagram of the refrigerant flow direction in the dehumidification-reheat mode.
Fig. 4 is a schematic view of the flow of refrigerant in the heating mode.
Wherein, 1, a compressor; 2-an oil separator; 3-a four-way valve; 4-outdoor heat exchanger; 5-a first electronic expansion valve; 6-a second electronic expansion valve; 7-gas-liquid separator; 8-shell and tube heat exchangers; 9-a one-way valve; 10-a fourth electronic expansion valve; 11-a third electronic expansion valve; 12-a dehumidifying heat exchanger; 13-a fifth electronic expansion valve; 14-a reheat heat exchanger; 100-an outdoor unit; 200-a divergence box; 301-inner machine I; 302-inner machine II. The arrows indicate the refrigerant flow direction.
Detailed Description
The invention is further described below with reference to the drawings and examples.
As shown in fig. 1.
A dehumidification reheating system comprises an outer machine 100, an inner machine I301, an inner machine II302 and a branch box 200. The structures of the inner unit I301 and the inner unit II302 and the connection manner between the inner unit I and the outer unit 100 and the branch box 200 are the same, and therefore, the description of the system structure and the control method in this embodiment takes the inner unit I as an example.
The outdoor unit includes a compressor 1, an oil separator 2, a four-way valve 3, an outdoor heat exchanger 4, and a gas-liquid separator 7, etc.
A shell and tube heat exchanger 8, a third electronic expansion valve 11, a fourth electronic expansion valve 10 and the like are arranged in the branch box 200. The shell and tube heat exchanger 8 includes four ports: f1, f2, f3 and f4. Wherein, the phases f1 and f4 are communicated, and the phases f2 and f3 are communicated, so that the refrigerant exchanges heat in the shell and tube heat exchanger.
The inner machines I301 each include a dehumidification heat exchanger 12, a reheat heat exchanger 14, and a fifth electronic expansion valve 13. This dehumidification heat exchanger 12 and reheat heat exchanger 14 mutual parallel arrangement, just reheat heat exchanger 14 is close to the indoor set air outlet makes it can be under indoor fan's effect, makes indoor air pass through in proper order dehumidification heat exchanger and reheat heat exchanger realize the dehumidification reheat effect.
The refrigerant circulation circuit of the system comprises the following connections:
the air outlet and the air suction port of the compressor 1 are respectively connected with the inlet of the oil separator 2 and the outlet of the gas-liquid separator;
four ports of the four-way valve 3 are respectively connected with the outlet of the oil separator 2, the first end of the outdoor heat exchanger 4, the inlet of the gas-liquid separator 7 and the first end of the dehumidifying heat exchanger 12;
a second end of the dehumidification heat exchanger 12 is connected with a second end of the reheat heat exchanger 14 through a fifth electronic expansion valve 13;
a first end of the reheating heat exchanger 14 passes through a third electronic expansion valve 11 and a first electronic expansion valve 5 in sequence and then is connected to a second end of the outdoor heat exchanger 4;
the f1 end of the shell and tube heat exchanger 8 is connected to the outlet of the oil separator 2 after passing through a second electronic expansion valve 6;
f2 of the shell and tube heat exchanger 8 is connected to the pipe between the first electronic expansion valve 5 and the third electronic expansion valve 11;
the f3 end of the shell and tube heat exchanger 8 passes through a fourth electronic expansion valve 10 and then is connected with the first end of the reheating heat exchanger 14;
and the f4 end of the shell and tube heat exchanger 8 is connected to a pipeline between the first electronic expansion valve 5 and the third electronic expansion valve 11 after passing through the one-way valve 9.
The branch box 100 can be connected with the outdoor unit 100 and the indoor unit through stop valves, so that the installation is more convenient.
The branch box 200 is disposed outside the outdoor unit 100, and is convenient to connect. Alternatively, the branch box 200 may be disposed in the outdoor unit 100, so that the system structure is more compact and convenient to install.
The invention can be connected with more than two internal machines at the same time, and can also be connected with other types of internal machines, such as a common internal machine only comprising a single heat exchanger, and the like, and is connected with the branch box through two pipes so as to meet the requirements of different environments.
The invention discloses a control method of a dehumidification reheating system, which comprises the following steps:
1) The cooling mode, as shown in figure 2,
the first electronic expansion valve is opened to control the flow; the second electronic expansion valve is closed; the third electronic expansion valve is opened to play a throttling role; the fourth electronic expansion valve is closed; the fifth electronic expansion valve is fully opened;
detecting an air outlet temperature T3 and an air inlet temperature T1 through temperature sensors arranged at two ends of a dehumidification heat exchanger, and calculating the superheat degree P = T3-T1 of an inner machine;
if P1 is more than or equal to P and less than or equal to P2, the opening of the third electronic expansion valve is unchanged; if P is larger than P2, the opening of the third electronic expansion valve is opened greatly, and the third electronic expansion valve is adjusted once every 1 minute; if P is more than P1, the opening of the third electronic expansion valve is small, and the third electronic expansion valve is adjusted once every 1 minute; wherein P1 and P2 are set superheat degrees, and P1 is less than P2; preferably, P1 is 1 ℃ and P2 is 3 ℃; the opening degree of the third electronic expansion valve is opened or closed in 4 steps each time;
in this mode, the shell and tube heat exchanger does not participate in operation; the refrigerant flow direction is as follows: a compressor exhaust port, an oil separator, a four-way valve, an outdoor heat exchanger, a first electronic expansion valve, a third electronic expansion valve, a reheating heat exchanger, a fifth electronic expansion valve, a dehumidifying heat exchanger, a four-way valve, a gas-liquid separator and a compressor suction port; the reheating heat exchanger and the dehumidifying heat exchanger are both used as evaporators, so that the refrigerating efficiency can be enhanced; meanwhile, the noise generated by the flowing of the refrigerant can be reduced, and the use adaptability is improved;
2) The dehumidification reheat mode, as shown in figure 3,
the first electronic expansion valve is opened to control the flow; the second electronic expansion valve is opened to play a role in limiting the flow; closing the third electronic expansion valve; the fourth electronic expansion valve is fully opened; the fifth electronic expansion valve is opened to play a role in throttling;
detecting an outlet air temperature T3 and an inlet air temperature T1 through temperature sensors arranged at two ends of the dehumidifying heat exchanger, and calculating the superheat degree P = T3-T1 of the inner machine;
if P1 is not less than P and not more than P2, the opening degree of the fifth electronic expansion valve is unchanged; if P is more than P2, opening the opening of the fifth electronic expansion valve, adjusting 4P every time, and adjusting once every 1 minute; if P is less than P1, the opening of the fifth electronic expansion valve is reduced, and the fifth electronic expansion valve is adjusted for 4 steps each time and once every 1 minute;
if T3 is less than or equal to W1, the opening degree of the second electronic expansion valve is increased; if T3 is larger than or equal to W2, the opening degree of the second electronic expansion valve is reduced; adjusting every 1 minute; wherein W1 and W2 are set temperatures, and W1 is less than W2; preferably, W1 is 20 ℃ and W2 is 22 ℃; the initial opening degree of the second electronic expansion valve is 120 steps, and the subsequent opening degree is opened or closed in 4 steps each time;
at this time, the flow direction of the refrigerant is: the compressor exhaust port-oil separator is divided into two paths, wherein one path is as follows: the four-way valve, the outdoor heat exchanger, the first electronic expansion valve, the shell and tube heat exchanger f2f3, and the other path are as follows: a second electronic expansion valve, a shell and tube heat exchanger f1f4, a shell and tube heat exchanger f2f3; after the two paths are combined, the following flow directions are continued: the four-way valve comprises a fourth electronic expansion valve, a reheating heat exchanger, a fifth electronic expansion valve, a dehumidifying heat exchanger, a four-way valve, a gas-liquid separator and a compressor air suction port;
in this mode, on one hand, the dehumidification efficiency can be controlled by adjusting the opening degree of the fifth electronic expansion valve; meanwhile, the temperature of the refrigerant flowing through the reheating heat exchanger can be increased by adjusting the opening degree of the second electronic expansion valve and acting on the heat exchanger of the shell-and-tube heat exchanger, so that the air outlet temperature is increased, and the refrigeration cold feeling is avoided;
3) The heating mode, as shown in figure 4,
the first electronic expansion valve is opened to play a throttling role; the second electronic expansion valve is closed; the third electronic expansion valve is opened to a fixed opening degree; the fourth electronic expansion valve is closed; the fifth electronic expansion valve is fully opened;
detecting the exhaust temperature Tp through a temperature sensor arranged at the exhaust port of the compressor;
if Tp is more than or equal to W3 and less than or equal to W4, keeping the current opening of the first electronic expansion valve unchanged; if Tp is more than W4, opening the first electronic expansion valve; if Tp is less than W3, the opening of the first electronic expansion valve is small; adjusting every 1 minute; wherein W3 and W4 are set temperatures, and W3 is more than W4; preferably, W3 is 70 ℃, and W4 is 80 ℃; the opening of the first electronic expansion valve is opened or closed in 4 steps each time;
in this mode, the shell and tube heat exchanger does not participate in operation; the refrigerant flow direction is as follows: a compressor exhaust port, an oil separator, a four-way valve, a dehumidification heat exchanger, a fifth electronic expansion valve, a reheat heat exchanger, a third electronic expansion valve, a first electronic expansion valve, an outdoor heater, a four-way valve, a gas-liquid separator and a compressor suction port; the dehumidification heat exchanger and the reheating heat exchanger are both used as condensers, so that the heating efficiency is improved; meanwhile, the noise generated by the flowing of the refrigerant can be reduced, and the use adaptability is improved.
The invention can realize the dehumidification and reheating functions by connecting the two pipes, and is convenient to install and control. Moreover, the problem that reheating capacity of the existing two-pipe system is insufficient is solved, and air outlet temperature can be controlled in a larger range when a dehumidification reheating mode is operated, so that requirements of users are fully met. Meanwhile, a plurality of same or different types of internal machines can be connected, the requirements of different indoor environments are met, and the indoor air conditioner is very suitable for market popularization.
The parts not involved in the present invention are the same as or can be implemented using the prior art.
Claims (5)
1. A dehumidification reheating system comprises an external unit, an internal unit and a branch box, and is characterized in that the external unit comprises a compressor, an oil separator, a four-way valve, an outdoor heat exchanger and a gas-liquid separator; a shell and tube heat exchanger is arranged in the branch box; the indoor unit comprises a dehumidification heat exchanger and a reheating heat exchanger; the dehumidification heat exchanger and the reheating heat exchanger are arranged in parallel, and the reheating heat exchanger is close to the air outlet of the internal machine;
the air outlet and the air suction port of the compressor are respectively connected with the inlet of the oil separator and the outlet of the gas-liquid separator;
four ports of the four-way valve are respectively connected with the outlet of the oil separator, the first end of the outdoor heat exchanger, the inlet of the gas-liquid separator and the first end of the dehumidifying heat exchanger;
the second end of the dehumidification heat exchanger is connected with the second end of the reheating heat exchanger through a fifth electronic expansion valve;
the first end of the reheating heat exchanger is connected to the second end of the outdoor heat exchanger after sequentially passing through a third electronic expansion valve and a first electronic expansion valve;
and the f1 end of the shell and tube heat exchanger is connected to the outlet of the oil separator after passing through a second electronic expansion valve, the f2 end of the shell and tube heat exchanger is connected to a pipeline between the first electronic expansion valve and a third electronic expansion valve, the f3 end of the shell and tube heat exchanger is connected to the first end of the reheating heat exchanger after passing through a fourth electronic expansion valve, and the f4 end of the shell and tube heat exchanger is connected to a pipeline between the first electronic expansion valve and the third electronic expansion valve after passing through a one-way valve.
2. The system of claim 1, wherein the manifold is connected to the outdoor unit and the indoor unit by shut-off valves.
3. The dehumidification and reheat system of claim 1, wherein said manifold is disposed inside or outside said outdoor unit.
4. The dehumidification reheat system of claim 1, wherein said inner unit is plural; the structure of each internal machine and the connection mode of the internal machine and the branch box and the external machine are the same.
5. A method for controlling a dehumidification reheating system according to any one of claims 1 to 4, comprising the steps of:
1) In the cooling mode, the air conditioner is operated,
the first electronic expansion valve is opened to control the flow; the second electronic expansion valve is closed; the third electronic expansion valve is opened to play a throttling role; the fourth electronic expansion valve is closed; the fifth electronic expansion valve is fully opened;
detecting an air outlet temperature T3 and an air inlet temperature T1 through temperature sensors arranged at two ends of a dehumidification heat exchanger, and calculating the superheat degree P = T3-T1 of an inner machine;
if P1 is more than or equal to P2, the opening of the third electronic expansion valve is unchanged; if P is larger than P2, the opening of the third electronic expansion valve is opened greatly, and the third electronic expansion valve is adjusted once every 1 minute; if P is more than P1, the opening of the third electronic expansion valve is small, and the third electronic expansion valve is adjusted once every 1 minute; wherein P1 and P2 are set superheat degrees, and P1 is less than P2;
2) The dehumidification re-heating mode is adopted,
the first electronic expansion valve is opened to control the flow; the second electronic expansion valve is opened to play a role in limiting the flow; the third electronic expansion valve is closed; the fourth electronic expansion valve is fully opened; the fifth electronic expansion valve is opened to play a throttling role;
detecting an outlet air temperature T3 and an inlet air temperature T1 through temperature sensors arranged at two ends of the dehumidifying heat exchanger, and calculating the superheat degree P = T3-T1 of the inner machine;
if P1 is more than or equal to P and less than or equal to P2, the opening of the fifth electronic expansion valve is unchanged; if P is larger than P2, the opening of the fifth electronic expansion valve is opened greatly, and the fifth electronic expansion valve is adjusted once every 1 minute; if P is more than P1, the opening of the fifth electronic expansion valve is reduced, and the fifth electronic expansion valve is adjusted once every 1 minute;
if T3 is less than or equal to W1, the opening degree of the second electronic expansion valve is increased; if T3 is larger than or equal to W2, the opening degree of the second electronic expansion valve is reduced; adjusting every 1 minute; wherein W1 and W2 are set temperatures, and W1 is less than W2;
3) A heating mode;
the first electronic expansion valve is opened to play a throttling role; the second electronic expansion valve is closed; the third electronic expansion valve is opened to a fixed opening degree; the fourth electronic expansion valve is closed; the fifth electronic expansion valve is fully opened;
detecting the exhaust temperature Tp through a temperature sensor arranged at the exhaust port of the compressor;
if Tp is more than or equal to W3 and less than or equal to W4, keeping the current opening of the first electronic expansion valve unchanged; if Tp is more than W4, opening the first electronic expansion valve; if Tp is less than W3, the opening of the first electronic expansion valve is small; every 1 minute; wherein W3 and W4 are set temperatures, and W3 is less than W4.
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| CN112013474A (en) * | 2019-05-30 | 2020-12-01 | 广东美的制冷设备有限公司 | Air conditioner and control method thereof |
| CN112555982A (en) * | 2021-01-04 | 2021-03-26 | 南京天加环境科技有限公司 | Temperature and humidity double-control air conditioning system |
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2021
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105157117A (en) * | 2015-10-20 | 2015-12-16 | 珠海格力电器股份有限公司 | Air conditioning system and control method thereof |
| CN107192159A (en) * | 2017-07-11 | 2017-09-22 | 南京天加环境科技有限公司 | A kind of cold and hot unit of improved Gas-supplying enthalpy-increasing |
| CN107906778A (en) * | 2017-11-13 | 2018-04-13 | 南京天加环境科技有限公司 | The control system and control method of multi-gang air-conditioner unit air injection enthalpy-increasing jet amount |
| CN112013474A (en) * | 2019-05-30 | 2020-12-01 | 广东美的制冷设备有限公司 | Air conditioner and control method thereof |
| CN112555982A (en) * | 2021-01-04 | 2021-03-26 | 南京天加环境科技有限公司 | Temperature and humidity double-control air conditioning system |
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