CN113074410B - Refrigeration control method for long-piping multi-split air conditioner - Google Patents
Refrigeration control method for long-piping multi-split air conditioner Download PDFInfo
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- CN113074410B CN113074410B CN202110464263.8A CN202110464263A CN113074410B CN 113074410 B CN113074410 B CN 113074410B CN 202110464263 A CN202110464263 A CN 202110464263A CN 113074410 B CN113074410 B CN 113074410B
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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
- F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
- F24F1/0003—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station characterised by a split arrangement, wherein parts of the air-conditioning system, e.g. evaporator and condenser, are in separately located units
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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
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
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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
- F24F11/70—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
- F24F11/00—Control or safety arrangements
- F24F11/88—Electrical aspects, e.g. 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
- 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
- F24F2140/10—Pressure
- F24F2140/12—Heat-exchange fluid pressure
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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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- Combustion & Propulsion (AREA)
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- General Engineering & Computer Science (AREA)
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- Physics & Mathematics (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Thermal Sciences (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention relates to a long-piping multi-split air conditioner refrigeration control method, wherein the multi-split air conditioner comprises an outdoor unit and a plurality of indoor units, and the outdoor unit is connected with each indoor unit through a long-piping liquid pipe and a long-piping air pipe; the outdoor unit comprises a compressor; a low pressure sensor and an air suction temperature sensor are arranged on an air suction port of the compressor; an environment temperature sensor is arranged in the outdoor unit; a central disc temperature sensor is respectively arranged in each indoor unit; the low-pressure sensor, the air suction temperature sensor, the environment temperature sensor and the middle disc temperature sensor are all connected with the unit controller; therefore, the output of the indoor unit can be adjusted according to the conditions of the indoor unit and the outdoor unit of the system, the problems of inconsistent output of the indoor unit and the outdoor unit of the long-piping multi-split air conditioner and the like are effectively solved, and the use comfort is improved.
Description
Technical Field
The invention relates to a control method of an air conditioning system, in particular to a multi-split air conditioner refrigeration control method, and specifically relates to a long-piping multi-split air conditioner refrigeration control method.
Background
The variable frequency multi-split air conditioner can adjust the output power of the outdoor unit according to the refrigerating capacity requirement of the indoor unit, so that the refrigerating system can stably and efficiently run while meeting the requirement of a user. However, under some conditions, the internal and external units are connected by pipes having a considerable length. In this case, a part of the output power of the outdoor unit is consumed to overcome the resistance of the long piping, and the amount of cooling energy transmitted to the indoor unit is insufficient, thereby affecting the sufficient effect of the air conditioning system.
At present, when a general multi-split air conditioning system refrigerates, target low-pressure control is generally adopted, namely, the output of a compressor is adjusted according to a system low-pressure value acquired by an outdoor low-pressure sensor. In this case, the problem of consumption of long piping and large differential pressure between both ends of the piping are not considered, and the low pressure value of the outdoor unit may reach the control target, but the pressure difference between the indoor unit and the outdoor unit may cause the phenomenon that the actual indoor unit pressure is still high (and thus the refrigerant temperature is high), and the refrigeration effect is poor, and the like, thereby greatly affecting the use comfort.
Therefore, improvements are urgently needed so as to better improve the use comfort and meet the market demand.
Disclosure of Invention
The invention aims to provide a refrigeration control method of a long-piping multi-split air conditioner, aiming at the defects of the prior art, which can adjust the output of an internal machine according to the conditions of the internal machine and the external machine of a system, effectively solves the problems of inconsistent output of the internal machine and the external machine of the long-piping multi-split air conditioner and the like, and improves the use comfort.
The technical scheme of the invention is as follows:
a long-piping multi-split air-conditioning refrigeration control method is characterized in that the multi-split air-conditioning refrigeration control method comprises an outdoor unit and a plurality of indoor units, wherein the outdoor unit is connected with each indoor unit through a long-piping liquid pipe and a long-piping air pipe; the outdoor unit comprises a compressor; a low pressure sensor and an air suction temperature sensor are arranged on an air suction port of the compressor; an environment temperature sensor is arranged in the outdoor unit; a central disc temperature sensor is respectively arranged in each indoor unit; the low-pressure sensor, the air suction temperature sensor, the environment temperature sensor and the middle disc temperature sensor are all connected with the unit controller; the control method comprises the following steps:
1) the unit is started, the refrigeration mode is operated,
2) acquiring the temperature Ti of the central panel of each indoor unit in real time through a central panel temperature sensor, and calculating the average central panel temperature Ti-ave and the saturation pressure Pi corresponding to the Ti-ave;
acquiring the outdoor environment temperature To in real time through an outdoor environment temperature sensor;
acquiring the suction temperature Tc of an outdoor unit compressor in real time through a suction temperature sensor;
acquiring outdoor suction pressure Pc in real time through a low-pressure sensor;
3) calculating the pressure difference delta P and the temperature difference delta T: Δ P = Pc-Pi; Δ T = Tc-Tiave;
4) selecting a preset target low-pressure range adopted currently according to the pressure difference and the temperature difference:
if the delta T is larger than or equal to Ts2 or the delta P is larger than or equal to Ps2, selecting a preset target low-voltage range K3 from the current target low-voltage range;
if Ts1 is more than or equal to delta T and less than Ts2 and Ps1 is more than or equal to delta P and less than Ps2, selecting a preset target low-pressure range K2 from the current target low-pressure range;
if the delta T is less than Ts1 and the delta P is less than Ps1, selecting a preset target low-pressure range K1 from the current target low-pressure range;
wherein, Ps1 and Ps2 are both preset target pressure difference, and Ps2 is less than or equal to Ps 1; ts1 and Ts2 are both preset target temperature differences, and Ts1 is less than or equal to Ts 2;
5) selecting a target low-voltage interval (Knia, Knib) within a current target low-voltage range Kn according To the outdoor environment temperature To, wherein n is a subscript of 1-3 and corresponds To a preset target low-voltage range K1-K3; i is subscript 1-5 and corresponds to an ambient temperature interval; wherein K1ia is more than or equal to K2ia is more than or equal to K3ia, K1ib is more than or equal to K2ib is more than or equal to K3 ib;
6) controlling the output of the compressor according to the relationship between Pc and the current target low-pressure range:
when Pc is larger than Knib, increasing the rotating speed delta r 1/t on the current basis until the frequency of the compressor reaches the current outputtable upper limit value Rmax; wherein t is a control period;
when Knia is not less than Pc and not more than Knib, the frequency of the compressor keeps the current frequency;
when Pc < Knia, the compressor frequency is reduced by the rotating speed delta r 2/t on the current basis until the compressor frequency reaches the lower limit value Rmin which can be output currently.
Further, in the step 4), the K1 is set as follows:
when To is less than or equal To 15 ℃, K1 is (K11 a, K11 b);
when the temperature is more than 15 ℃ and To is less than or equal To 25 ℃, K1 is (K12 a, K12 b);
when the temperature To is more than 25 ℃ and less than or equal To 35 ℃, K1 is (K13 a, K13 b);
when the temperature is more than 35 ℃ and To is less than or equal To 45 ℃, K1 is (K14 a, K14 b);
when To > 45 ℃, K1 is (K15 a, K15 b).
Further, in the step 4), the K2 is set as follows:
when To is less than or equal To 15 ℃, K2 is (K21 a, K21 b);
when the temperature is more than 15 ℃ and To is less than or equal To 25 ℃, K2 is (K22 a, K22 b);
when To is more than 25 ℃ and less than or equal To 35 ℃, K2 is (K23 a, K23 b);
when the temperature is more than 35 ℃ and To is less than or equal To 45 ℃, K2 is (K24 a, K24 b);
when To > 45 ℃, K2 is (K25 a, K25 b).
Further, in the step 4), the K3 is set as follows:
when To is less than or equal To 15 ℃, K3 is (K31 a, K31 b);
when the temperature is more than 15 ℃ and To is less than or equal To 25 ℃, K3 is (K32 a, K32 b);
when the temperature is more than 25 ℃ and To is less than or equal To 35 ℃, K3 is (K33 a, K33 b);
when the temperature is more than 35 ℃ and To is less than or equal To 45 ℃, K3 is (K34 a, K34 b);
when To > 45 ℃, K3 is (K35 a, K35 b).
The invention has the beneficial effects that:
the invention has the advantages of reasonable design, clear logic, convenient control, intelligent adjustment, real-time control and the like, can adjust the output of the indoor unit according to the conditions of the indoor unit and the outdoor unit of the system, effectively solves the problems of inconsistent output of the indoor unit and the outdoor unit of the long-piping multi-split air conditioner and the like, and improves the use comfort.
Drawings
FIG. 1 is a schematic diagram of the system architecture of the present invention.
Wherein: 1-long piping liquid pipe; 2-long piping air pipe; 3-indoor electronic expansion valve; 4-a mid-pan temperature sensor; 5-an indoor unit; 6-an outdoor unit; 7-a compressor; 8-a low pressure sensor; 9-a suction temperature sensor; 10-outdoor heat exchange; 11-ambient temperature sensor; 12-a controller.
Detailed Description
The invention is further described below with reference to the figures and examples.
As shown in fig. 1.
A long-piping multi-split air conditioner system includes an outdoor unit 6 and a plurality of indoor units 5.
The outdoor unit 6 and each indoor unit 5 are connected to each other through a long piping liquid pipe 1 and a long piping gas pipe 2. The outdoor unit 6 includes a compressor 7, an outdoor unit heat exchanger 10, a controller 12, and the like. The suction port of the compressor 7 is provided with a low pressure sensor 8 and a suction temperature sensor 9, and can detect outdoor suction pressure and compressor suction temperature. The outdoor unit 6 is also provided with an ambient temperature sensor 11 for detecting an outdoor ambient temperature.
And an indoor electronic expansion valve 3 is respectively arranged in each indoor unit 5 to meet the requirement of refrigeration operation. Meanwhile, a central disc temperature sensor 4 is also arranged in each indoor unit 5 and can detect the temperature of the central disc of the indoor unit.
And the low-voltage sensor 8, the air suction temperature sensor 9, the ambient temperature sensor 11 and the central disc temperature sensor 4 are electrically connected with the unit controller 12, and can acquire and process detection signals in real time.
The invention relates to a long-piping multi-split air-conditioning refrigeration control method, which judges the resistance loss condition in a long-piping by detecting the difference between the average center plate temperature of an indoor unit and the suction temperature of an outdoor unit and the difference between the saturation pressure corresponding to the average center plate temperature of the indoor unit and the outdoor suction pressure in real time and comparing the difference with a preset value. And selecting a proper preset target low-pressure range according to the difference value, and adjusting the rotating speed of the compressor according to the difference value, so that the output power of the compressor is changed, the pressure loss of a pipeline is compensated, and the refrigeration effect is prevented from being influenced. The control method comprises the following steps:
1) the unit is started, the refrigeration mode is operated,
2) acquiring the temperature Ti of the central panel of each indoor unit in real time through a central panel temperature sensor, and calculating the average central panel temperature Ti-ave and the saturation pressure Pi corresponding to the Ti-ave;
acquiring the outdoor environment temperature To in real time through an outdoor environment temperature sensor;
acquiring the suction temperature Tc of an outdoor unit compressor in real time through a suction temperature sensor;
acquiring outdoor suction pressure Pc in real time through a low-pressure sensor;
3) calculating the pressure difference delta P and the temperature difference delta T: Δ P = Pc-Pi; Δ T = Tc-Tiave;
4) selecting a preset target low-pressure range adopted currently according to the pressure difference and the temperature difference:
if the delta T is larger than or equal to Ts2 or the delta P is larger than or equal to Ps2, selecting a preset target low-voltage range K3 from the current target low-voltage range;
if Ts1 is more than or equal to delta T and less than Ts2 and Ps1 is more than or equal to delta P and less than Ps2, selecting a preset target low-pressure range K2 from the current target low-pressure range;
if the delta T is less than Ts1 and the delta P is less than Ps1, selecting a preset target low-pressure range K1 from the current target low-pressure range;
wherein, Ps1 and Ps2 are both preset target pressure difference, and Ps2 is less than or equal to Ps 1; ts1 and Ts2 are both preset target temperature differences, and Ts1 is less than or equal to Ts 2;
5) selecting a target low-voltage interval (Knia, Knib) within a current target low-voltage range Kn according To the outdoor environment temperature To, wherein n is a subscript of 1-3 and corresponds To a preset target low-voltage range K1-K3; i is subscript 1-5 and corresponds to an ambient temperature interval; wherein K1ia is more than or equal to K2ia is more than or equal to K3ia, K1ib is more than or equal to K2ib is more than or equal to K3 ib;
6) controlling the output of the compressor according to the relationship between Pc and the current target low-pressure range:
when Pc is larger than Knib, increasing the rotating speed delta r 1/t on the current basis until the frequency of the compressor reaches the current outputtable upper limit value Rmax; wherein t is a control period;
when Knia is not less than Pc and not more than Knib, the frequency of the compressor keeps the current frequency;
when Pc < Knia, the compressor frequency is reduced by the rotating speed delta r 2/t on the current basis until the compressor frequency reaches the lower limit value Rmin which can be output currently.
The upper limit value Rmax, the lower limit value Rmin and the control period t of the compressor are all preset manually and can be adjusted according to actual conditions.
In the step 4), the K1 is set as follows:
when To is less than or equal To 15 ℃, K1 is (K11 a, K11 b);
when the temperature is more than 15 ℃ and To is less than or equal To 25 ℃, K1 is (K12 a, K12 b);
when the temperature To is more than 25 ℃ and less than or equal To 35 ℃, K1 is (K13 a, K13 b);
when the temperature is more than 35 ℃ and To is less than or equal To 45 ℃, K1 is (K14 a, K14 b);
when To > 45 ℃, K1 is (K15 a, K15 b).
The K2 is set as follows:
when To is less than or equal To 15 ℃, K2 is (K21 a, K21 b);
when the temperature is more than 15 ℃ and To is less than or equal To 25 ℃, K2 is (K22 a, K22 b);
when To is more than 25 ℃ and less than or equal To 35 ℃, K2 is (K23 a, K23 b);
when the temperature is more than 35 ℃ and To is less than or equal To 45 ℃, K2 is (K24 a, K24 b);
when To > 45 ℃, K2 is (K25 a, K25 b).
The K3 is set as follows:
when To is less than or equal To 15 ℃, K3 is (K31 a, K31 b);
when the temperature is more than 15 ℃ and To is less than or equal To 25 ℃, K3 is (K32 a, K32 b);
when the temperature is more than 25 ℃ and To is less than or equal To 35 ℃, K3 is (K33 a, K33 b);
when the temperature is more than 35 ℃ and To is less than or equal To 45 ℃, K3 is (K34 a, K34 b);
when To > 45 ℃, K3 is (K35 a, K35 b).
The control method has the advantages of intelligent adjustment, real-time control and the like, can properly solve the problems of inconsistent output of the internal machine and the external machine when the multi-split long pipe is installed, and the like, and improves the use comfort.
The parts not involved in the present invention are the same as or can be implemented using the prior art.
Claims (4)
1. A long-piping multi-split air-conditioning refrigeration control method is characterized in that the multi-split air-conditioning refrigeration control method comprises an outdoor unit and a plurality of indoor units, wherein the outdoor unit is connected with each indoor unit through a long-piping liquid pipe and a long-piping air pipe; the outdoor unit comprises a compressor; a low pressure sensor and an air suction temperature sensor are arranged on an air suction port of the compressor; an environment temperature sensor is arranged in the outdoor unit; a central disc temperature sensor is respectively arranged in each indoor unit; the low-pressure sensor, the air suction temperature sensor, the environment temperature sensor and the middle disc temperature sensor are all connected with the unit controller; the control method comprises the following steps:
1) the unit is started, the refrigeration mode is operated,
2) acquiring the temperature Ti of the central panel of each indoor unit in real time through a central panel temperature sensor, and calculating the average central panel temperature Ti-ave and the saturation pressure Pi corresponding to the Ti-ave;
acquiring the outdoor environment temperature To in real time through an outdoor environment temperature sensor;
acquiring the suction temperature Tc of an outdoor unit compressor in real time through a suction temperature sensor;
acquiring outdoor suction pressure Pc in real time through a low-pressure sensor;
3) calculating the pressure difference delta P and the temperature difference delta T: Δ P = Pc-Pi; Δ T = Tc-Tiave;
4) selecting a preset target low-pressure range adopted currently according to the pressure difference and the temperature difference:
if the delta T is larger than or equal to Ts2 or the delta P is larger than or equal to Ps2, selecting a preset target low-voltage range K3 from the current target low-voltage range;
if Ts1 is more than or equal to delta T and less than Ts2 and Ps1 is more than or equal to delta P and less than Ps2, selecting a preset target low-pressure range K2 from the current target low-pressure range;
if the delta T is less than Ts1 and the delta P is less than Ps1, selecting a preset target low-pressure range K1 from the current target low-pressure range;
wherein, Ps1 and Ps2 are both preset target pressure difference, and Ps2 is less than or equal to Ps 1; ts1 and Ts2 are both preset target temperature differences, and Ts1 is less than or equal to Ts 2;
5) selecting a target low-voltage interval (Knia, Knib) within a current target low-voltage range Kn according To the outdoor environment temperature To, wherein n is a subscript of 1-3 and corresponds To a preset target low-voltage range K1-K3; i is subscript 1-5 and corresponds to an ambient temperature interval; wherein K1ia is more than or equal to K2ia is more than or equal to K3ia, K1ib is more than or equal to K2ib is more than or equal to K3 ib;
6) controlling the output of the compressor according to the relationship between Pc and the current target low-pressure range:
when Pc is larger than Knib, increasing the rotating speed delta r 1/t on the current basis until the frequency of the compressor reaches the current outputtable upper limit value Rmax; wherein t is a control period;
when Knia is not less than Pc and not more than Knib, the frequency of the compressor keeps the current frequency;
when Pc < Knia, the compressor frequency is reduced by the rotating speed delta r 2/t on the current basis until the compressor frequency reaches the lower limit value Rmin which can be output currently.
2. The cooling control method for a long-piping multi-split air conditioner according to claim 1, wherein in the step 4), the K1 is set as follows:
when To is less than or equal To 15 ℃, K1 is (K11 a, K11 b);
when the temperature is more than 15 ℃ and To is less than or equal To 25 ℃, K1 is (K12 a, K12 b);
when the temperature To is more than 25 ℃ and less than or equal To 35 ℃, K1 is (K13 a, K13 b);
when the temperature is more than 35 ℃ and To is less than or equal To 45 ℃, K1 is (K14 a, K14 b);
when To > 45 ℃, K1 is (K15 a, K15 b).
3. The cooling control method for a long-piping multi-split air conditioner according to claim 1, wherein in the step 4), the K2 is set as follows:
when To is less than or equal To 15 ℃, K2 is (K21 a, K21 b);
when the temperature is more than 15 ℃ and To is less than or equal To 25 ℃, K2 is (K22 a, K22 b);
when To is more than 25 ℃ and less than or equal To 35 ℃, K2 is (K23 a, K23 b);
when the temperature is more than 35 ℃ and To is less than or equal To 45 ℃, K2 is (K24 a, K24 b);
when To > 45 ℃, K2 is (K25 a, K25 b).
4. The cooling control method for a long-piping multi-split air conditioner according to claim 1, wherein in the step 4), the K3 is set as follows:
when To is less than or equal To 15 ℃, K3 is (K31 a, K31 b);
when the temperature is more than 15 ℃ and To is less than or equal To 25 ℃, K3 is (K32 a, K32 b);
when the temperature is more than 25 ℃ and To is less than or equal To 35 ℃, K3 is (K33 a, K33 b);
when the temperature is more than 35 ℃ and To is less than or equal To 45 ℃, K3 is (K34 a, K34 b);
when To > 45 ℃, K3 is (K35 a, K35 b).
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