CN112361473A - Air conditioning system combining multi-split air conditioner and cold and hot water unit and control method thereof - Google Patents
Air conditioning system combining multi-split air conditioner and cold and hot water unit and control method thereof Download PDFInfo
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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
- 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
- F24F3/065—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 a plurality of evaporators or condensers
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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
- F24F11/64—Electronic processing using pre-stored data
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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
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/86—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling compressors within refrigeration or heat pump circuits
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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
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
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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
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
- F24F2110/12—Temperature of the outside air
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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
- F24F2140/00—Control inputs relating to system states
- F24F2140/20—Heat-exchange fluid temperature
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Abstract
The invention relates to an air conditioning system combining a multi-split air conditioner and a cold and hot water unit and a control method thereof, wherein the multi-split air conditioner comprises an outdoor unit and a plurality of indoor units; a water-fluorine heat exchanger is arranged in the cold and hot water unit; liquid pipes of the indoor units and liquid pipes of the water-fluorine heat exchanger are converged and then connected to a liquid pipe stop valve of the outdoor unit; the air pipes in the rooms and the air pipes of the water-fluorine heat exchanger are converged and then connected to an air pipe stop valve of the outdoor unit; a liquid pipe end of each indoor unit is provided with a first electronic expansion valve; and a second electronic expansion valve is arranged at the liquid pipe end of the water-fluorine heat exchanger. The invention can adjust the rotation speed of the compressor and the electronic expansion valves of the multi-split air conditioner and the cold and hot water units by detecting the temperature of the liquid pipe and the air pipe and the temperature of the outlet water and the return water, thereby realizing the simultaneous operation of the two units, exerting the respective characteristics and fully meeting the requirements of users.
Description
Technical Field
The invention relates to air conditioning equipment and a control method thereof, in particular to a combined air conditioner and a control method thereof, and specifically relates to an air conditioning system combining a multi-split air conditioner and a cold and hot water unit and a control method thereof.
Background
The multi-split air-cooled module cold and hot water unit is two common air conditioning systems at present, the basic principles of the multi-split air-cooled module cold and hot water unit are the same, most parts of products are the same, but due to different heat transfer media, manufacturers can separately develop and manufacture the two products, and resource waste is caused to a certain extent.
At present, although there are products combining the two units, the multi-split unit and the cold and hot water unit cannot be used simultaneously, and the requirements of users are difficult to meet.
Therefore, improvements are needed to better meet the needs of the market.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides an air conditioning system combining a multi-split air conditioner and a cold and hot water unit and a control method thereof, which can organically combine the multi-split air conditioner and the cold and hot water unit, enable the multi-split air conditioner and the cold and hot water unit to be used simultaneously, give full play to respective characteristics and meet the requirements of users.
The technical scheme of the invention is as follows:
an air conditioning system combining a multi-split air conditioner and a cold and hot water unit, wherein the multi-split air conditioner comprises an outdoor unit and a plurality of indoor units; a water-fluorine heat exchanger is arranged in the cold and hot water unit; liquid pipes of the indoor units and liquid pipes of the water-fluorine heat exchanger are converged and then connected to a liquid pipe stop valve of the outdoor unit; the air pipes in the rooms and the air pipes of the water-fluorine heat exchanger are converged and then connected to an air pipe stop valve of the outdoor unit; the liquid pipe end of each indoor unit is respectively provided with a first electronic expansion valve; and a second electronic expansion valve is arranged at the liquid pipe end of the water-fluorine heat exchanger.
Further, an environment temperature sensor is arranged on the outdoor unit; a liquid pipe end of each indoor unit is respectively provided with a first temperature sensor; the air pipe end of each indoor unit is provided with a second temperature sensor; a third temperature sensor is respectively arranged at an air return inlet of each indoor unit; a fourth temperature sensor is arranged at the liquid pipe end of the water-fluorine heat exchanger; a fifth temperature sensor is arranged at the gas pipe end of the water-fluorine heat exchanger; a sixth temperature sensor is arranged on a water outlet pipe of the cold and hot water unit; and a seventh temperature sensor is arranged on a water return pipe of the cold and hot water unit.
Furthermore, each indoor unit can be independently opened and closed, and the temperature can be independently set; the cold and hot water unit can be independently opened and closed, and the outlet water temperature is set.
A control method of an air conditioning system combining a multi-split air conditioner and a cold and hot water unit comprises the following steps that an indoor unit and the cold and hot water unit are in an operating state:
1) adjusting the rotating speed of the compressor;
1.1) starting an outdoor unit, and starting an indoor unit as required;
1.1.1) detecting each indoor unit through a respective third temperature sensor to obtain the return air temperature Tir (n) of each indoor unit; detecting an ambient temperature To by an ambient temperature sensor;
1.1.2) calculating the temperature difference delta Ti (n) = tis (n) -Tir (n) of each indoor unit, wherein: tis (n) is the set temperature of each indoor unit;
1.1.3) determining the energy demand coefficient alpha (n) of each indoor unit according to delta Ti (n):
in a system refrigeration mode: Δ ti (n) < -5 ℃, α (n) = 1; Δ ti (n) < -3 ℃, α (n) = 0.8; Δ ti (n) < -1 ℃, α (n) = 0.5; Δ ti (n) ≥ 0 ℃, α (n) = 0;
in a system heating mode: Δ ti (n) > 5 ℃, α (n) = 1.1; Δ ti (n) > 3 ℃, α (n) = 0.9; Δ ti (n) > 1 ℃, α (n) = 0.6; delta Ti (n) is less than or equal to 0 ℃, and alpha (n) = 0;
1.1.4) computing system corresponding can need to be: total of Qi = Qi (1) × α (1) + Qi (2) × α (2) … + Qi (n) × α (n); wherein: qi (1).. Qi (n) is the rated refrigerating capacity of each indoor unit;
1.2) starting an outdoor unit, and starting a cold and hot water unit;
1.2.1) the water temperature Tl of the cold and hot water unit is detected by a sixth temperature sensor; detecting the temperature Tr of the inlet water through a seventh temperature sensor;
1.2.2) calculating the water temperature difference delta Tc = Tcs-Tl, and delta Tc = Tl-Tr |; wherein: tcs is the outlet water set temperature;
1.2.3) determining the energy demand coefficient beta of the cold and hot water machine according to the delta Tc:
in a refrigeration mode, delta Tc is less than-5 ℃, and beta = 1.2; -Tc < 3 ℃, β = 1; -1 ℃ Δ Tc, (. beta. =1 Δ Tc')/5; Δ Tc ≥ 0 ℃, β =0.5 × Δ Tc'/5; delta Tc is more than or equal to 2 ℃, and beta = 0;
in a heating mode, delta Tc is more than 5 ℃, and beta = 1.3; Δ Tc > 3 ℃, β = 1.1; Δ Tc > 1 ℃, β =0.9 Δ Tc'/5; Δ Tc ≦ 0 ℃, β =0.6 × Δ Tc'/5; Δ Tc ≦ 2 ℃, β = 0;
1.2.4) calculating the corresponding energy requirements of the cold and hot water unit as follows: qc total = Qc × β; wherein Qc is the rated refrigerating capacity of the cold and hot water unit;
1.2) calculating the total output Qo of the system:
during cooling operation, Qo = (Qi total + Qc total) (To + 10)/45;
qo = (Qi total + Qc total) (41-To)/34 during heating operation;
1.3) the system controller adjusts the rotating speed R = Qo/gamma of the compressor according to Qo; wherein gamma is the output corresponding to each rotation of the compressor;
2) the control method of the first electronic expansion valve of each indoor unit and the second electronic expansion valve of the cold and hot water unit comprises the following steps:
2.1) in the cooling mode,
2.1.1) the initial opening degree of the first electronic expansion valve of each indoor unit and the initial opening degree of the second electronic expansion valve of the cold and hot water unit are both P0= 150;
2.1.2) each indoor unit detects the liquid pipe temperature Til (n) and the air pipe temperature Tig (n) through a first temperature sensor and a second temperature sensor respectively; the cold and hot water unit detects the liquid pipe temperature Tcl and the gas pipe temperature Tcg of the water-fluorine heat exchanger through a fourth temperature sensor and a fifth temperature sensor respectively;
2.1.3) calculating: the intermediate temperature tim (n) = (til (n)) + tig (n))/2 of each indoor unit heat exchanger;
the intermediate temperature Tcm = (Tcl + Tcg)/2 of a water-fluorine heat exchanger of a cold-hot water unit;
2.1.4) calculating the average air pipe temperature Tga = (Tig (1) + Tig (2) + … Tig (n) + Tcg)/(n + 1) of each indoor machine heat exchanger and cold and hot water machine set water fluorine heat exchanger;
2.1.5) calculating the air pipe temperature difference delta Tg = Tgg-Tga of each indoor unit or cold and hot water unit; wherein, Tgg is Tig (n) or Tcg;
2.1.6) determining the opening variation quantity delta P1 of the electronic expansion valve according to delta Tg: Δ P1 > 5 ℃, Δ P1= + 12; Δ P1 > 3 ℃, Δ P1= + 8; Δ P1 > 1 ℃, Δ P1= + 4; delta P1 is more than or equal to-1 ℃ and less than or equal to 1 ℃, and delta P1= 0; delta P1 < -1 ℃ and delta P1= 4; delta P1 is lower than-3 ℃, and delta P1 is = 8; delta P1 < -5 ℃, delta P1= 12;
2.1.7) calculating the difference value delta Tgl = Tgg-Tll between the air pipe temperature and the liquid pipe temperature of each indoor unit or cold and hot water unit; wherein, Tgg is Tig (n) or Tcg, Tll is Til (n) or Tcl;
2.1.8) determining the variation quantity delta P2 of the opening of the electronic expansion valve according to delta Tgl: Δ Tgl > 8 ℃ and Δ P2= + 12; Δ Tgl > 5 ℃ and Δ P2= + 8; Δ Tgl > 3 ℃ and Δ P2= + 4; delta Tgl is more than or equal to 2 and less than or equal to 3 ℃, and delta P2= 0; delta Tgl is less than 2 ℃, and delta P2= -4; delta Tgl is less than 1 ℃, and delta P2= -8;
2.1.9) adjusting the opening degree P = P0 +/delta P1 +/delta P2 of the first electronic expansion valve of each indoor unit and/or the second electronic expansion valve of the water cooling and heating machine; the adjusting period is 40S;
2.2) heating mode;
2.2.1) the initial opening degree of the first electronic expansion valve of each indoor unit and the initial opening degree of the second electronic expansion valve of the cold and hot water unit are both P0= 400;
2.2.2) calculating: the intermediate temperature tim (n) = (til (n)) + tig (n))/2 of each indoor unit heat exchanger;
the intermediate temperature Tcm = (Tcl + Tcg)/2 of a water-fluorine heat exchanger of a cold-hot water unit;
2.2.3) calculating the average intermediate temperature Tma = (Tim (1) + Tim (2) + … Tim (n) + Tcm)/(n + 1) of each indoor machine heat exchanger and the water-fluorine heat exchanger of the cold and hot water machine set;
2.2.4) calculating the intermediate temperature difference value delta Tm = Tmm-Tma of each indoor machine heat exchanger or the water-fluorine heat exchanger of the cold and hot water unit; wherein Tm is Tim (n) or Tcm;
2.2.5) determining the opening variation quantity delta P3 of the electronic expansion valve according to the delta Tm: delta Tm is more than 5 ℃, and delta P3= -12; delta Tm is more than 3 ℃, and delta P3= -8; delta Tm is more than 1 ℃, and delta P3= -4; delta Tm is more than or equal to 1 ℃ and less than or equal to 1 ℃, and delta P3= 0; Δ Tm < -1 ℃ and Δ P3= + 4;
△Tm＜-3℃，△P3=+8；△Tm＜-5℃，△P3=+12；
2.2.6) adjusting the opening degree of a first electronic expansion valve of each indoor unit and/or a second electronic expansion valve of a cold and hot water unit to P = P0 +. DELTA.P 3; the conditioning period was 40S.
The invention has the beneficial effects that:
the multi-split air conditioner is reasonable in design and convenient to control, can organically combine the multi-split air conditioner and the cold and hot water unit, enables the multi-split air conditioner and the cold and hot water unit to be used simultaneously, exerts respective characteristics and fully meets the requirements of users.
Drawings
FIG. 1 is a schematic diagram of the system architecture of the present invention.
Wherein: 1-an outdoor unit; 2-an indoor unit; 4-a first electronic expansion valve; 5-a first temperature sensor; 6-a second temperature sensor; 7-a third temperature sensor; 8-indoor heat exchanger; 9-a cold and hot water unit; 10-a second electronic expansion valve; 11-a fourth temperature sensor; 12-a fifth temperature sensor; 13-a sixth temperature sensor; 14-a seventh temperature sensor; 15-ambient temperature sensor.
Detailed Description
The invention is further described below with reference to the figures and examples.
As shown in fig. 1.
An air conditioning system combining a multi-split air conditioner and a cold and hot water unit. The multi-split air conditioner comprises an outdoor unit 1 and a plurality of indoor units 2. And a water-fluorine heat exchanger is arranged in the cold and hot water unit 9. And liquid pipes of the indoor units 2 and liquid pipes of the water-fluorine heat exchanger are converged and then connected to a liquid pipe stop valve of the outdoor unit 1. And air pipes of the indoor units 2 and air pipes of the water-fluorine heat exchanger are converged and then connected to an air pipe stop valve of the outdoor unit 1. A first electronic expansion valve 4 is arranged at the liquid pipe end of each indoor unit 2. And a second electronic expansion valve 10 is arranged at the liquid pipe end of the water-fluorine heat exchanger.
The outdoor unit 1 is provided with an ambient temperature sensor 15 capable of detecting the temperature of the outdoor environment. The liquid pipe end of each indoor unit 2 is provided with a first temperature sensor 5, which can detect the temperature of each indoor unit liquid pipe. The air pipe end of each indoor unit 2 is provided with a second temperature sensor 6, which can detect the temperature of the air pipe of each indoor unit. A third temperature sensor 7 is provided at the return air inlet of each indoor unit 2, and can detect the return air temperature. And a fourth temperature sensor 11 is arranged at the liquid pipe end of the water-fluorine heat exchanger and can detect the temperature of the liquid pipe. And a fifth temperature sensor 12 is arranged at the gas pipe end of the water-fluorine heat exchanger and can detect the gas pipe temperature. And a sixth temperature sensor 13 is arranged on a water outlet pipe of the cold and hot water unit 9 and can detect the temperature of the outlet water. And a seventh temperature sensor 14 is arranged on a water return pipe of the cold and hot water unit 9 and can detect the water return temperature.
Each indoor unit 2 can be independently opened and closed, and the temperature can be independently set. The cold and hot water unit 9 can also be opened and closed independently, and the outlet water temperature is set.
The operation modes of the indoor units and the cold and hot water units are the same, namely, all cooling or all heating.
The control method of the air conditioning system combining the multi-split air conditioner and the cold and hot water unit comprises the following steps that the related indoor unit and the related cold and hot water unit are both in a running state:
1) adjusting the rotating speed of the compressor;
1.1) starting an outdoor unit, and starting an indoor unit as required;
1.1.1) detecting each indoor unit through a respective third temperature sensor to obtain the return air temperature Tir (n) of each indoor unit; detecting an ambient temperature To by an ambient temperature sensor;
1.1.2) calculating the temperature difference delta Ti (n) = tis (n) -Tir (n) of each indoor unit, wherein: tis (n) is the set temperature of each indoor unit;
1.1.3) determining the energy demand coefficient alpha (n) of each indoor unit according to delta Ti (n):
in a system refrigeration mode: Δ ti (n) < -5 ℃, α (n) = 1; Δ ti (n) < -3 ℃, α (n) = 0.8; Δ ti (n) < -1 ℃, α (n) = 0.5; Δ ti (n) ≥ 0 ℃, α (n) = 0;
in a system heating mode: Δ ti (n) > 5 ℃, α (n) = 1.1; Δ ti (n) > 3 ℃, α (n) = 0.9; Δ ti (n) > 1 ℃, α (n) = 0.6; delta Ti (n) is less than or equal to 0 ℃, and alpha (n) = 0;
1.1.4) computing system corresponding can need to be: total of Qi = Qi (1) × α (1) + Qi (2) × α (2) … + Qi (n) × α (n); wherein: qi (1) ·. Qi (n) is a rated refrigerating capacity of each indoor unit, and is set when a product leaves a factory;
1.2) starting an outdoor unit, and starting a cold and hot water unit;
1.2.1) the water temperature Tl of the cold and hot water unit is detected by a sixth temperature sensor; detecting the temperature Tr of the inlet water through a seventh temperature sensor;
1.2.2) calculating the water temperature difference delta Tc = Tcs-Tl, and delta Tc = Tl-Tr |; wherein: tcs is the outlet water set temperature;
1.2.3) determining the energy demand coefficient beta of the cold and hot water machine according to the delta Tc:
in a refrigeration mode, delta Tc is less than-5 ℃, and beta = 1.2; -Tc < 3 ℃, β = 1; -1 ℃ Δ Tc, (. beta. =1 Δ Tc')/5; Δ Tc ≥ 0 ℃, β =0.5 × Δ Tc'/5; delta Tc is more than or equal to 2 ℃, and beta = 0;
in a heating mode, delta Tc is more than 5 ℃, and beta = 1.3; Δ Tc > 3 ℃, β = 1.1; Δ Tc > 1 ℃, β =0.9 Δ Tc'/5; Δ Tc ≦ 0 ℃, β =0.6 × Δ Tc'/5; Δ Tc ≦ 2 ℃, β = 0;
1.2.4) calculating the corresponding energy requirements of the cold and hot water unit as follows: qc total = Qc × β; wherein Qc is the rated refrigerating capacity of the cold and hot water unit and is set when the product leaves a factory;
1.2) calculating the total output Qo of the system:
during cooling operation, Qo = (Qi total + Qc total) (To + 10)/45;
qo = (Qi total + Qc total) (41-To)/34 during heating operation;
1.3) the system controller adjusts the rotating speed R = Qo/gamma of the compressor according to Qo; wherein gamma is the output corresponding to each rotation of the compressor;
2) the control method of the first electronic expansion valve of each indoor unit and the second electronic expansion valve of the cold and hot water unit comprises the following steps:
2.1) in the cooling mode,
2.1.1) the initial opening degree of the first electronic expansion valve of each indoor unit and the initial opening degree of the second electronic expansion valve of the cold and hot water unit are both P0= 150;
2.1.2) each indoor unit detects the liquid pipe temperature Til (n) and the air pipe temperature Tig (n) through a first temperature sensor and a second temperature sensor respectively; the cold and hot water unit detects the liquid pipe temperature Tcl and the gas pipe temperature Tcg of the water-fluorine heat exchanger through a fourth temperature sensor and a fifth temperature sensor respectively;
2.1.3) calculating: the intermediate temperature tim (n) = (til (n)) + tig (n))/2 of each indoor unit heat exchanger;
the intermediate temperature Tcm = (Tcl + Tcg)/2 of a water-fluorine heat exchanger of a cold-hot water unit;
2.1.4) calculating the average air pipe temperature Tga = (Tig (1) + Tig (2) + … Tig (n) + Tcg)/(n + 1) of each indoor machine heat exchanger and cold and hot water machine set water fluorine heat exchanger;
2.1.5) calculating the air pipe temperature difference delta Tg = Tgg-Tga of each indoor unit or cold and hot water unit; wherein, Tgg is Tig (n) or Tcg;
2.1.6) determining the opening variation quantity delta P1 of the electronic expansion valve according to delta Tg: Δ P1 > 5 ℃, Δ P1= + 12; Δ P1 > 3 ℃, Δ P1= + 8; Δ P1 > 1 ℃, Δ P1= + 4; delta P1 is more than or equal to-1 ℃ and less than or equal to 1 ℃, and delta P1= 0; delta P1 < -1 ℃ and delta P1= 4; delta P1 is lower than-3 ℃, and delta P1 is = 8; delta P1 < -5 ℃, delta P1= 12;
2.1.7) calculating the difference value delta Tgl = Tgg-Tll between the air pipe temperature and the liquid pipe temperature of each indoor unit or cold and hot water unit; wherein, Tgg is Tig (n) or Tcg, Tll is Til (n) or Tcl;
2.1.8) determining the variation quantity delta P2 of the opening of the electronic expansion valve according to delta Tgl: Δ Tgl > 8 ℃ and Δ P2= + 12; Δ Tgl > 5 ℃ and Δ P2= + 8; Δ Tgl > 3 ℃ and Δ P2= + 4; delta Tgl is more than or equal to 2 and less than or equal to 3 ℃, and delta P2= 0; delta Tgl is less than 2 ℃, and delta P2= -4; delta Tgl is less than 1 ℃, and delta P2= -8;
2.1.9) adjusting the opening degree P = P0 +/delta P1 +/delta P2 of the first electronic expansion valve of each indoor unit and/or the second electronic expansion valve of the water cooling and heating machine; the adjusting period is 40S;
2.2) heating mode;
2.2.1) the initial opening degree of the first electronic expansion valve of each indoor unit and the initial opening degree of the second electronic expansion valve of the cold and hot water unit are both P0= 400;
2.2.2) calculating: the intermediate temperature tim (n) = (til (n)) + tig (n))/2 of each indoor unit heat exchanger;
the intermediate temperature Tcm = (Tcl + Tcg)/2 of a water-fluorine heat exchanger of a cold-hot water unit;
2.2.3) calculating the average intermediate temperature Tma = (Tim (1) + Tim (2) + … Tim (n) + Tcm)/(n + 1) of each indoor machine heat exchanger and the water-fluorine heat exchanger of the cold and hot water machine set;
2.2.4) calculating the intermediate temperature difference value delta Tm = Tmm-Tma of each indoor machine heat exchanger or the water-fluorine heat exchanger of the cold and hot water unit; wherein Tm is Tim (n) or Tcm;
2.2.5) determining the opening variation quantity delta P3 of the electronic expansion valve according to the delta Tm: delta Tm is more than 5 ℃, and delta P3= -12; delta Tm is more than 3 ℃, and delta P3= -8; delta Tm is more than 1 ℃, and delta P3= -4; delta Tm is more than or equal to 1 ℃ and less than or equal to 1 ℃, and delta P3= 0; Δ Tm < -1 ℃ and Δ P3= + 4;
△Tm＜-3℃，△P3=+8；△Tm＜-5℃，△P3=+12；
2.2.6) adjusting the opening degree of a first electronic expansion valve of each indoor unit and/or a second electronic expansion valve of a cold and hot water unit to P = P0 +. DELTA.P 3; the conditioning period was 40S.
The multi-split air conditioner can organically combine the multi-split air conditioner and the cold and hot water unit, and can realize the simultaneous operation of the multi-split air conditioner and the cold and hot water unit, so that the multi-split air conditioner can give play to the respective characteristics and fully meet the requirements of users.
The parts not involved in the present invention are the same as or can be implemented using the prior art.
Claims (4)
1. An air conditioning system combining a multi-split air conditioner and a cold and hot water unit is characterized in that: the multi-split air conditioner comprises an outdoor unit and a plurality of indoor units; a water-fluorine heat exchanger is arranged in the cold and hot water unit; liquid pipes of the indoor units and liquid pipes of the water-fluorine heat exchanger are converged and then connected to a liquid pipe stop valve of the outdoor unit; the air pipes in the rooms and the air pipes of the water-fluorine heat exchanger are converged and then connected to an air pipe stop valve of the outdoor unit; the liquid pipe end of each indoor unit is respectively provided with a first electronic expansion valve; and a second electronic expansion valve is arranged at the liquid pipe end of the water-fluorine heat exchanger.
2. An air conditioning system combined with a multi-split air conditioner and a hot and cold water unit as set forth in claim 1, wherein: an environment temperature sensor is arranged on the outdoor unit; a liquid pipe end of each indoor unit is respectively provided with a first temperature sensor; the air pipe end of each indoor unit is provided with a second temperature sensor; a third temperature sensor is respectively arranged at an air return inlet of each indoor unit; a fourth temperature sensor is arranged at the liquid pipe end of the water-fluorine heat exchanger; a fifth temperature sensor is arranged at the gas pipe end of the water-fluorine heat exchanger; a sixth temperature sensor is arranged on a water outlet pipe of the cold and hot water unit; and a seventh temperature sensor is arranged on a water return pipe of the cold and hot water unit.
3. An air conditioning system combined with a multi-split air conditioner and a hot and cold water unit as set forth in claim 1, wherein: each indoor unit can be independently opened and closed and independently set temperature; the cold and hot water unit can be independently opened and closed, and the outlet water temperature is set.
4. A method for controlling an air conditioning system in which a multi-split air conditioner and a hot and cold water unit are combined according to any one of claims 1 to 3, comprising: the method comprises the following steps that the related indoor unit and the related cold and hot water unit are both in a running state:
1) adjusting the rotating speed of the compressor;
1.1) starting an outdoor unit, and starting an indoor unit as required;
1.1.1) detecting each indoor unit through a respective third temperature sensor to obtain the return air temperature Tir (n) of each indoor unit; detecting an ambient temperature To by an ambient temperature sensor;
1.1.2) calculating the temperature difference delta Ti (n) = tis (n) -Tir (n) of each indoor unit, wherein: tis (n) is the set temperature of each indoor unit;
1.1.3) determining the energy demand coefficient alpha (n) of each indoor unit according to delta Ti (n):
in a system refrigeration mode: Δ ti (n) < -5 ℃, α (n) = 1; Δ ti (n) < -3 ℃, α (n) = 0.8; Δ ti (n) < -1 ℃, α (n) = 0.5; Δ ti (n) ≥ 0 ℃, α (n) = 0;
in a system heating mode: Δ ti (n) > 5 ℃, α (n) = 1.1; Δ ti (n) > 3 ℃, α (n) = 0.9; Δ ti (n) > 1 ℃, α (n) = 0.6; delta Ti (n) is less than or equal to 0 ℃, and alpha (n) = 0;
1.1.4) computing system corresponding can need to be: total of Qi = Qi (1) × α (1) + Qi (2) × α (2) … + Qi (n) × α (n); wherein: qi (1).. Qi (n) is the rated refrigerating capacity of each indoor unit;
1.2) starting an outdoor unit, and starting a cold and hot water unit;
1.2.1) the water temperature Tl of the cold and hot water unit is detected by a sixth temperature sensor; detecting the temperature Tr of the inlet water through a seventh temperature sensor;
1.2.2) calculating the water temperature difference delta Tc = Tcs-Tl, and delta Tc = Tl-Tr |; wherein: tcs is the outlet water set temperature;
1.2.3) determining the energy demand coefficient beta of the cold and hot water machine according to the delta Tc:
in a refrigeration mode, delta Tc is less than-5 ℃, and beta = 1.2; -Tc < 3 ℃, β = 1; -1 ℃ Δ Tc, (. beta. =1 Δ Tc')/5; Δ Tc ≥ 0 ℃, β =0.5 × Δ Tc'/5; delta Tc is more than or equal to 2 ℃, and beta = 0;
in a heating mode, delta Tc is more than 5 ℃, and beta = 1.3; Δ Tc > 3 ℃, β = 1.1; Δ Tc > 1 ℃, β =0.9 Δ Tc'/5; Δ Tc ≦ 0 ℃, β =0.6 × Δ Tc'/5; Δ Tc ≦ 2 ℃, β = 0;
1.2.4) calculating the corresponding energy requirements of the cold and hot water unit as follows: qc total = Qc × β; wherein Qc is the rated refrigerating capacity of the cold and hot water unit;
1.2) calculating the total output Qo of the system:
during cooling operation, Qo = (Qi total + Qc total) (To + 10)/45;
qo = (Qi total + Qc total) (41-To)/34 during heating operation;
1.3) the system controller adjusts the rotating speed R = Qo/gamma of the compressor according to Qo; wherein gamma is the output corresponding to each rotation of the compressor;
2) the control method of the first electronic expansion valve of each indoor unit and the second electronic expansion valve of the cold and hot water unit comprises the following steps:
2.1) in the cooling mode,
2.1.1) the initial opening degree of the first electronic expansion valve of each indoor unit and the initial opening degree of the second electronic expansion valve of the cold and hot water unit are both P0= 150;
2.1.2) each indoor unit detects the liquid pipe temperature Til (n) and the air pipe temperature Tig (n) through a first temperature sensor and a second temperature sensor respectively; the cold and hot water unit detects the liquid pipe temperature Tcl and the gas pipe temperature Tcg of the water-fluorine heat exchanger through a fourth temperature sensor and a fifth temperature sensor respectively;
2.1.3) calculating: the intermediate temperature tim (n) = (til (n)) + tig (n))/2 of each indoor unit heat exchanger;
the intermediate temperature Tcm = (Tcl + Tcg)/2 of a water-fluorine heat exchanger of a cold-hot water unit;
2.1.4) calculating the average air pipe temperature Tga = (Tig (1) + Tig (2) + … Tig (n) + Tcg)/(n + 1) of each indoor machine heat exchanger and cold and hot water machine set water fluorine heat exchanger;
2.1.5) calculating the air pipe temperature difference delta Tg = Tgg-Tga of each indoor unit or cold and hot water unit; wherein, Tgg is Tig (n) or Tcg;
2.1.6) determining the opening variation quantity delta P1 of the electronic expansion valve according to delta Tg: Δ P1 > 5 ℃, Δ P1= + 12; Δ P1 > 3 ℃, Δ P1= + 8; Δ P1 > 1 ℃, Δ P1= + 4; delta P1 is more than or equal to-1 ℃ and less than or equal to 1 ℃, and delta P1= 0; delta P1 < -1 ℃ and delta P1= 4; delta P1 is lower than-3 ℃, and delta P1 is = 8; delta P1 < -5 ℃, delta P1= 12;
2.1.7) calculating the difference value delta Tgl = Tgg-Tll between the air pipe temperature and the liquid pipe temperature of each indoor unit or cold and hot water unit; wherein, Tgg is Tig (n) or Tcg, Tll is Til (n) or Tcl;
2.1.8) determining the variation quantity delta P2 of the opening of the electronic expansion valve according to delta Tgl: Δ Tgl > 8 ℃ and Δ P2= + 12; Δ Tgl > 5 ℃ and Δ P2= + 8; Δ Tgl > 3 ℃ and Δ P2= + 4; delta Tgl is more than or equal to 2 and less than or equal to 3 ℃, and delta P2= 0; delta Tgl is less than 2 ℃, and delta P2= -4; delta Tgl is less than 1 ℃, and delta P2= -8;
2.1.9) adjusting the opening degree P = P0 +/delta P1 +/delta P2 of the first electronic expansion valve of each indoor unit and/or the second electronic expansion valve of the water cooling and heating machine; the adjusting period is 40S;
2.2) heating mode;
2.2.1) the initial opening degree of the first electronic expansion valve of each indoor unit and the initial opening degree of the second electronic expansion valve of the cold and hot water unit are both P0= 400;
2.2.2) calculating: the intermediate temperature tim (n) = (til (n)) + tig (n))/2 of each indoor unit heat exchanger;
the intermediate temperature Tcm = (Tcl + Tcg)/2 of a water-fluorine heat exchanger of a cold-hot water unit;
2.2.3) calculating the average intermediate temperature Tma = (Tim (1) + Tim (2) + … Tim (n) + Tcm)/(n + 1) of each indoor machine heat exchanger and the water-fluorine heat exchanger of the cold and hot water machine set;
2.2.4) calculating the intermediate temperature difference value delta Tm = Tmm-Tma of each indoor machine heat exchanger or the water-fluorine heat exchanger of the cold and hot water unit; wherein Tm is Tim (n) or Tcm;
2.2.5) determining the opening variation quantity delta P3 of the electronic expansion valve according to the delta Tm: delta Tm is more than 5 ℃, and delta P3= -12; delta Tm is more than 3 ℃, and delta P3= -8; delta Tm is more than 1 ℃, and delta P3= -4; delta Tm is more than or equal to 1 ℃ and less than or equal to 1 ℃, and delta P3= 0; Δ Tm < -1 ℃ and Δ P3= + 4;
△Tm＜-3℃，△P3=+8；△Tm＜-5℃，△P3=+12；
2.2.6) adjusting the opening degree of a first electronic expansion valve of each indoor unit and/or a second electronic expansion valve of a cold and hot water unit to P = P0 +. DELTA.P 3; the conditioning period was 40S.
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