CN113883699A - Control method for reducing starting refrigerant sound of air conditioning system and air conditioning system - Google Patents
Control method for reducing starting refrigerant sound of air conditioning system and air conditioning system Download PDFInfo
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- CN113883699A CN113883699A CN202111143182.4A CN202111143182A CN113883699A CN 113883699 A CN113883699 A CN 113883699A CN 202111143182 A CN202111143182 A CN 202111143182A CN 113883699 A CN113883699 A CN 113883699A
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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
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/41—Defrosting; Preventing freezing
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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
- F24F11/54—Control or safety arrangements characterised by user interfaces or communication using one central controller connected to several sub-controllers
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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
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- 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
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- 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
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- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
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Abstract
The invention relates to a control method for reducing starting refrigerant sound of an air conditioning system and the air conditioning system. The air conditioning system comprises at least one indoor unit, and when any indoor unit receives a starting signal, the control method for reducing the starting refrigerant sound of the air conditioning system executes the following steps: detecting the indoor environment temperature Tai of the indoor unit; acquiring an indoor environment temperature correction coefficient t and an evaporator volume correction coefficient V of the indoor unit based on the measured indoor environment temperature Tai; acquiring a compressor parameter f related to the rotating speed of the compressor; calculating a starting reference opening P1 of an expansion valve of an indoor unit based on the compressor parameter f, the evaporator volume correction coefficient V and the indoor environment temperature correction coefficient t; during the start-up of the indoor unit, the expansion valve is opened at a start-up reference opening degree P1. The starting reference opening degree of the expansion valve obtained by the method is more reasonable, so that the refrigerant can more quickly enter a stable state after the air conditioning system is started, and the aim of starting in a mute manner is fulfilled.
Description
Technical Field
The invention relates to the field of air conditioners, in particular to a control method for reducing starting refrigerant sound of an air conditioning system and the air conditioning system.
Background
Air conditioning systems generally refer to devices that manually adjust and control parameters such as temperature, humidity, and flow rate of the environment in a conditioned space (e.g., a building or structure). An air conditioning system generally includes an indoor unit installed in a conditioned space and an outdoor unit disposed outdoors. An indoor unit. One indoor unit may be provided, or a plurality of indoor units connected in parallel may be provided. A primary refrigerant air conditioning system in which one outdoor unit is connected to two or more indoor units via a pipe, and the outdoor side employs an air-cooled heat exchange form and the indoor side employs a direct evaporation heat exchange form is called a multi-split system or a multi-split central air conditioning system (also called a "one-split-multiple" air conditioning system). The multi-split system includes, but is not limited to, a variable refrigerant or refrigerant flow multi-split system, such as a variable frequency multi-split system.
When the air conditioning system is in a start-up operation, a refrigerant noise (referred to as "start-up refrigerant noise") is likely to be excessively large because the state of the refrigerant that has just started to circulate through the system is unstable. In particular, in the multi-split system, when the refrigerant needs to be distributed among the plurality of indoor units, an unstable refrigerant state is easily generated, and a start refrigerant sound which is easily complained by a user is generated.
The chinese invention patent CN108224689B discloses a technical solution for solving the noise generated by the standby indoor unit of a multi-connected air conditioning system in a heating mode. Specifically, the technical solution first needs to obtain the operation time of the heating mode, and when the operation time is greater than a time threshold, the opening degrees of the expansion valves corresponding to all the indoor units in the standby state are controlled to be adjusted to a reference opening degree, and then the opening degree of the expansion valve corresponding to each indoor unit in the standby state is adjusted based on the target parameter. However, this technical solution cannot overcome the problem of starting the refrigerant sound.
Accordingly, there is a need in the art for a new solution to the above problems.
Disclosure of Invention
In order to solve the above-mentioned problems in the prior art, that is, to solve the technical problem in the prior art that an air conditioning system generates a large noise of a starting refrigerant when being started, the present invention provides a control method for reducing the noise of the starting refrigerant of the air conditioning system, wherein the air conditioning system includes at least one indoor unit, and when any one of the indoor units receives a starting signal, the control method performs the following steps:
detecting the indoor environment temperature Tai of the indoor unit;
acquiring an indoor environment temperature correction coefficient t and an evaporator volume correction coefficient V of the indoor unit based on the measured indoor environment temperature Tai;
acquiring a compressor parameter f related to the rotating speed of the compressor;
calculating a starting reference opening degree P1 of an expansion valve of the indoor unit based on the compressor parameter f, the evaporator volume correction coefficient V, and the indoor ambient temperature correction coefficient t;
during the start-up of the indoor unit, the expansion valve is opened at the start-up reference opening degree P1.
The inventor notices that when an indoor unit or some indoor units of the air conditioning system are started in the development process of the air conditioning system, if the opening degree of the expansion valve, the operation parameters of the compressor and the actual working conditions are not matched, the refrigerant before reaching the expansion valve of the indoor unit is not sufficiently liquefied, and then great noise of the starting refrigerant is generated. Based on the above, in order to reduce the noise of the starting refrigerant, when any indoor unit receives the starting signal, the indoor environment temperature Tai of the indoor unit is detected; obtaining an indoor environment temperature modification coefficient t and an evaporator volume modification coefficient V of the indoor unit based on the indoor environment temperature Tai, and also obtaining a compressor parameter f related to the rotating speed of the compressor; then calculating a starting reference opening P1 of an expansion valve of the indoor unit based on the compressor parameter f, the indoor environment temperature modification coefficient t and the evaporator volume correction coefficient V; in the starting process of the indoor unit, the opening degree of the expansion valve is controlled by the starting reference opening degree P1, so that the opening degree of the expansion valve can be ensured to be matched with the operation parameters and the actual working conditions of the compressor. In other words, the starting reference opening degree of the expansion valve obtained by the method is more reasonable, so that the system refrigerant can more quickly enter a stable state after the air conditioning system is started, and the aim of starting in a mute manner is fulfilled.
In a preferred embodiment of the control method for reducing the starting refrigerant sound of the air conditioning system, the starting reference opening P1 is calculated by using the following formula:
P1＝f×V×t。
the calculation of the start reference opening degree P1 by the calculation formula is simple, and therefore, the calculation load of the controller of the air conditioning system can be reduced.
In the above preferred technical solution of the control method for reducing the starting refrigerant sound of the air conditioning system, the control method further includes obtaining a rated power of the air conditioning system; the step of obtaining an indoor ambient temperature correction coefficient t and an evaporator volume correction coefficient V of the indoor unit based on the measured indoor ambient temperature Tai includes: and acquiring the indoor environment temperature correction coefficient t and the evaporator volume correction coefficient V of the indoor unit based on the indoor environment temperature Tai and the rated power. The rated power not only corresponds to the refrigerating capacity of the air conditioning system, but also determines the volume of the evaporator of the indoor unit. Therefore, when the indoor environment temperature correction coefficient t and the evaporator volume correction coefficient V are determined, the result obtained by taking the indoor environment temperature Tai and the rated power of the air conditioning system into consideration is more practical and accurate.
In a preferred embodiment of the control method for reducing the starting refrigerant noise of the air conditioning system, the step of obtaining the indoor environment temperature correction coefficient t and the evaporator volume correction coefficient V of the indoor unit based on the indoor environment temperature Tai and the rated power includes: and acquiring the evaporator volume correction coefficient V and the indoor environment temperature correction coefficient t through a lookup table based on the indoor environment temperature Tai and the rated power. The method for directly searching the evaporator volume correction coefficient V and the indoor environment temperature correction coefficient t on the pre-prepared lookup table is simpler and quicker.
In a preferred technical solution of the control method for reducing the starting refrigerant sound of the air conditioning system, the lookup table is pre-stored in a controller of the air conditioning system. The direct storage of the look-up table in the controller facilitates the reading of the controller.
In a preferred embodiment of the control method for reducing the starting refrigerant noise of the air conditioning system, the compressor parameter f includes any one of a compressor rotation speed, a compressor displacement, and a compressor frequency. These parameters are related to the compressor speed and therefore can be used to calculate the starting reference opening degree of the expansion valve.
In a preferred technical solution of the control method for reducing the starting refrigerant sound of the air conditioning system, the air conditioning system is a multi-split system including a plurality of indoor units connected in parallel. The multi-split air conditioner system comprises a plurality of indoor units, a plurality of indoor units and a plurality of control methods for controlling the multi-split air conditioner system, wherein the indoor units are connected with the control methods in a split mode, and the control methods are connected with the indoor units in a split mode.
In order to solve the above problems in the prior art, that is, to solve the technical problem of generating a large noise of the starting refrigerant when the air conditioning system is started in the prior art, the present invention further provides an air conditioning system, wherein the air conditioning system includes at least one indoor unit, and when each indoor unit is started, the starting refrigerant sound of the indoor unit is reduced by using any one of the above control methods for reducing the starting refrigerant sound of the air conditioning system. The air conditioning system can realize mute start through the control method for reducing the starting refrigerant sound of the air conditioning system, thereby improving the satisfaction degree of users.
In a preferred technical solution of the above air conditioning system, the air conditioning system is a multi-split system including a plurality of the indoor units connected in parallel. The multi-split air-conditioning system can generate more remarkable mute starting effect by using any one of the control methods for reducing the starting refrigerant sound of the air-conditioning system.
In a preferred embodiment of the above air conditioning system, the air conditioning system has cooling and heating operation modes. The control method for reducing the starting refrigerant sound of the air conditioning system can achieve the effect of mute starting no matter the air conditioning system is started in the heating operation mode or the cooling operation mode.
Drawings
Preferred embodiments of the present invention are described below with reference to the accompanying drawings, in which:
FIG. 1 is a system schematic of an embodiment of an air conditioning system of the present invention;
FIG. 2 is a flow chart of a control method for reducing the starting refrigerant noise of the air conditioning system according to the present invention;
fig. 3 is a flowchart of a control method for reducing a start refrigerant sound of an air conditioning system according to an embodiment of the present invention.
List of reference numerals:
1. an air conditioning system; 11. an outdoor unit; 111. a compressor; 111a, compressor heating belt; 112a, an exhaust pipe; 112b, liquid pipe; 112c, a gas pipe; 112d, an air suction pipe; 113. a high voltage protection switch; 114. an oil separator; 115. an oil return capillary tube; 116. a one-way valve; 117. a high pressure sensor; 118. an outdoor heat exchanger; 119. a high pressure reservoir; 119a, a high-pressure reservoir heating belt; 120. drying the filter; 121. a liquid viewing mirror; 122. a liquid pipe stop valve; 123. an air pipe stop valve; 124. a gas-liquid separator; 125. a low pressure sensor; 126. a hot defrosting bypass pipeline; 127. a hot defrosting stop valve; 128. an outdoor balanced bypass line; 129. an outdoor bypass electromagnetic valve; 21. an indoor unit; 21a, a first indoor unit; 21b, a second indoor unit; 21c, a third indoor unit; 211a, a first indoor heat exchanger; 211b, a second indoor heat exchanger; 211c, a third indoor heat exchanger; 212a, a first expansion valve; 212b, a second expansion valve; 212c, a third expansion valve; 213a, a first indoor solenoid valve; 213b, a second indoor solenoid valve; 213c, a third indoor solenoid valve.
Detailed Description
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and are not intended to limit the scope of the present invention.
In order to solve the technical problem that the air conditioning system generates large starting refrigerant noise when being started in the prior art, the invention provides a control method for reducing the starting refrigerant noise of the air conditioning system, wherein the air conditioning system comprises at least one indoor unit, and when any indoor unit receives a starting signal, the control method executes the following steps:
detecting the indoor environment temperature Tai of the indoor unit (step S1);
acquiring an indoor environment temperature correction coefficient t and an evaporator volume correction coefficient V of the indoor unit based on the measured indoor environment temperature Tai (step S2);
acquiring a compressor parameter f related to the rotation speed of the compressor (step S3);
calculating a starting reference opening degree P1 of an expansion valve of the indoor unit based on the compressor parameter f, the evaporator volume correction coefficient V, and the indoor ambient temperature correction coefficient t (step S4);
during the start-up of the indoor unit, the expansion valve is opened at the start-up reference opening degree P1 (step S5).
FIG. 1 is a system schematic of an embodiment of the air conditioning system of the present invention. As shown in fig. 1, in one or more embodiments, the air conditioning system 1 is a multi-split system, and includes an outdoor unit 11 and three indoor units 21. The three indoor units 21 may be arranged in the same or different configurations according to actual needs. Alternatively, the air conditioning system 1 may be provided with two, four or another suitable number of indoor units. In this embodiment, the air conditioning system 1 has a cooling function. Alternatively, the air conditioning system 1 may also have a heating function.
As shown in fig. 1, in one or more embodiments, the outdoor unit 11 mainly includes a compressor 111, an outdoor heat exchanger 118, a high pressure accumulator 119, and a gas-liquid separator 124; the indoor units 21 include a first indoor unit 21a, a second indoor unit 21b, and a third indoor unit 21c connected in parallel. The first indoor unit 21a includes a first indoor heat exchanger 211a, a first expansion valve 212a, and a first indoor solenoid valve 213 a; the second indoor unit 21b includes a second indoor heat exchanger 211b, a second expansion valve 212b, and a second indoor solenoid valve 213 b; the third indoor unit 21c includes a third indoor heat exchanger 211c, a third expansion valve 212c, and a third indoor solenoid valve 213 c. The compressor 111 has a discharge port and a suction port (not shown). The discharge port of the compressor 111 is connected to the input end of the outdoor heat exchanger 118 through a discharge pipe 112 a; the output end of the outdoor heat exchanger 118 is connected to the high-pressure reservoir 119, the expansion valve of each indoor unit 21, and the indoor heat exchanger in this order through the liquid pipe 112 b; each indoor heat exchanger is connected to an inlet port of the gas-liquid separator 124 through a gas pipe 112c, and an outlet port of the gas-liquid separator 124 is connected to an inlet port of the compressor 111 through a suction pipe 112d, thereby being interconnected to form a refrigeration cycle allowing a refrigerant to flow therein.
As shown in FIG. 1, in one or more embodiments, the compressor 111 is an inverter compressor. Alternatively, the compressor 111 may include two or more compressors in parallel. These compressors may be all inverter compressors or may include some inverter compressors. In one or more embodiments, a high pressure protection switch 113 is disposed on the discharge line 112a near the discharge of the compressor 111 to provide shutdown protection when the discharge pressure of the compressor 111 is too high. In one or more embodiments, an oil separator 114 is disposed on the gas discharge pipe 112a, wherein a gas input end of the oil separator 114 is connected to a gas discharge port of the compressor 111; the gas output of the oil separator 114 is connected to the input of the outdoor heat exchanger 118 through the gas discharge pipe 112 a; the oil return discharge end of the oil separator 114 is connected to an oil return capillary tube 115 and is connected to the suction port of the compressor 111 through a pipe so as to return the lubricating oil to the compressor 111 in time. In one or more embodiments, a compressor heating belt 111a is provided at the bottom of the compressor 111 to preheat the compressor 111 when needed. In one or more embodiments, a check valve 116 for preventing the refrigerant from flowing backwards and a high pressure sensor 117 for detecting the discharge pressure of the compressor 111 are further disposed on the discharge pipe 112a, and both the check valve 116 and the pressure sensor 117 are located downstream of the gas output end of the oil separator 114.
As shown in fig. 1, in one or more embodiments, the outdoor heat exchanger 118 may be, but is not limited to, a finned coil heat exchanger or a plate heat exchanger, and is equipped with an outdoor heat exchanger fan (not shown). The high pressure accumulator 119 may receive the liquid refrigerant condensed by the outdoor heat exchanger 118 to adjust and ensure a refrigerant circulation amount in the refrigeration system. In one or more embodiments, a high pressure accumulator heating belt 119a is provided on the high pressure accumulator 119 to preheat the liquid refrigerant, ensuring accurate supply of the refrigerant. A dry filter 120, a sight glass 121, and a liquid pipe shutoff valve 122 are also connected in series in this order to the liquid pipe 112b downstream of the high-pressure accumulator 119. The desiccant filter 120 dries moisture in the liquid refrigerant, the liquid viewing mirror 121 is used to observe the flow condition of the liquid refrigerant and detect the water content in the refrigerant, and the liquid tube stop valve 122 is provided to assist in temporarily storing the refrigerant in the refrigeration cycle circuit outside the room, so as to facilitate the disassembly, assembly, maintenance and repair of the multi-split refrigeration and freezing unit 1. In one or more embodiments, corresponding first, second, and third indoor solenoid valves 213a, 213b, and 213c are further provided at positions of the liquid pipe 112b upstream of the first, second, and third expansion valves 212a, 212b, and 212c, respectively, to control the liquid refrigerant to flow into the corresponding first, second, and third indoor units 21a, 21b, and 21 c.
As shown in fig. 1, in one or more embodiments, the first expansion valve 212a, the second expansion valve 212b, and the third expansion valve 212c are thermostatic expansion valves. Alternatively, the first expansion valve 212a, the second expansion valve 212b, and the third expansion valve 212c may also be electronic expansion valves, or other suitable expansion valves. The first, second, and third indoor heat exchangers 211a, 211b, and 211c include, but are not limited to, fin-and-coil heat exchangers or plate heat exchangers, and are provided with corresponding indoor heat exchanger fans (not shown in the drawings). The gas pipe 112c is further provided with a gas pipe shutoff valve 123 to assist the refrigerant in the refrigeration cycle circuit to be temporarily stored outside the room in cooperation with the liquid pipe shutoff valve 122.
As shown in fig. 1, in one or more embodiments, a low pressure sensor 125 is further disposed on the suction pipe 112d for detecting a suction pressure of the compressor 111. In one or more embodiments, a hot defrosting bypass pipeline 126 is connected in parallel between the gas output end close to the oil-gas separator 114 and the output end of each indoor heat exchanger, and a hot defrosting stop valve 127 is arranged on the hot defrosting bypass pipeline 126, so that when the corresponding indoor heat exchanger needs defrosting, the hot defrosting stop valve 127 is opened, and the high-temperature and high-pressure gaseous refrigerant output from the exhaust port of the compressor 111 is allowed to be directly conveyed to the corresponding indoor heat exchanger through the hot defrosting bypass pipeline 126 for defrosting treatment. In one or more embodiments, an outdoor balance bypass line 128 is connected in parallel between the exhaust pipe 112a and the suction pipe 112d, and an outdoor bypass solenoid valve 129 is disposed on the outdoor balance bypass line 128.
When the air conditioning unit 1 receives a cooling instruction, the compressor 111 starts to start, and the refrigerant (for example, R410a) is compressed by the compressor 111 and then enters the outdoor heat exchanger 113 (which serves as a condenser) through the discharge pipe 112a in the form of high-temperature and high-pressure gas. In the outdoor heat exchanger 113, the high-temperature and high-pressure gas refrigerant is condensed into a high-temperature and high-pressure liquid refrigerant by transferring heat to an air flow caused by the outdoor heat exchanger fan. The high-temperature and high-pressure liquid refrigerant flows through the high-pressure accumulator 119, the dry filter 120, the liquid level indicator 121, and the liquid pipe shutoff valve 122 in this order, and flows to the expansion valve of the corresponding indoor unit 21. In the expansion valve, the high-temperature and high-pressure liquid refrigerant is throttled to a low-temperature and low-pressure liquid refrigerant, and then distributed to the corresponding indoor heat exchangers (one or more of the first, second, and third indoor heat exchangers 211a, 211b, and 211 c). The low-temperature low-pressure liquid refrigerant is evaporated into a low-temperature low-pressure gas refrigerant by absorbing heat of the indoor air, and the corresponding indoor air is cooled. The low-temperature and low-pressure gaseous refrigerant exits the corresponding indoor heat exchanger, passes through the corresponding gas pipe 112c and the gas pipe shutoff valve 123, and then enters the gas-liquid separator 124. The gas-liquid separated refrigerant gas is sucked into the compressor 111 through the suction port. A complete refrigeration cycle is completed and such refrigeration cycle can be performed without interruption in order to achieve the target refrigeration temperature.
The following describes in detail a control method for reducing the refrigerant noise for starting the air conditioning system according to the present invention based on the air conditioning unit 1. It should be noted that the control method of the present invention can also be used for other suitable refrigeration equipment.
Fig. 2 is a flowchart of a control method for reducing the starting refrigerant noise of the air conditioning system according to the present invention. As shown in fig. 2, when any one of the indoor units receives the start signal, the control method for reducing the start refrigerant sound of the air conditioning system starts and executes the following steps: step S1, step S2, step S3, step S4, and step S5.
In step S1, the indoor ambient temperature Tai at which the indoor unit is located is detected. For example, the indoor ambient temperature Tai is detected in real time by a temperature sensor disposed in the room to be measured or directly on the indoor unit. In one or more embodiments, the temperature sensor may detect the indoor ambient temperature Tai once every 10 seconds or other suitable time period. The indoor ambient temperature Tai is the dry bulb temperature. Alternatively, the temperature sensor may be a wet bulb temperature sensor, so the measured indoor ambient temperature is the wet bulb temperature. After obtaining the indoor ambient temperature Tai, the control method proceeds to step S2, where the indoor ambient temperature correction coefficient t and the evaporator volume correction coefficient V of the indoor unit are obtained based on the measured indoor ambient temperature Tai. The indoor environment temperature correction coefficient t is related to the indoor environment temperature, and the indoor environment temperature can be either the dry bulb temperature or the wet bulb temperature. The evaporator volume correction factor V is related to parameters such as the heat exchange area of the evaporator, the power of the air conditioning system, and the like. The indoor environment temperature correction coefficient t and the evaporator volume correction coefficient V of the indoor unit can be determined through experiments.
In step S3, a compressor parameter f relating to the compressor rotation speed is acquired. The compressor parameters f related to the compressor speed include, but are not limited to, the compressor speed, the discharge capacity of the compressor, and the compressor frequency. After obtaining the compressor parameter f, the indoor environment temperature correction coefficient t, and the evaporator volume correction coefficient V, the control method proceeds to step S4, where a starting reference opening P1 of the expansion valve of the indoor unit is calculated based on the compressor parameter f, the indoor environment temperature correction coefficient t, and the evaporator volume correction coefficient V, for example, using a calculation formula of P1 being f × V × t. Finally, in step S5, the expansion valve is controlled at the start reference opening degree P1 during the start of the indoor unit.
It should be noted that, unless explicitly indicated to the contrary, the steps of the control method described above are not limited to the order of execution, and for example, some steps may be executed simultaneously or sequentially.
Fig. 3 is a flowchart of a control method for reducing a start refrigerant sound of an air conditioning system according to an embodiment of the present invention. As shown in fig. 3, the control method for reducing the start refrigerant sound of the air conditioning system is started after the indoor unit receives the start signal. In step S1a, the indoor ambient temperature Tai where the indoor unit is located is detected, and the rated power of the air conditioning system is determined. The rated power of the air conditioning system is, for example, 0.6HP (p), 1HP, 2HP, or the like. Then, the control method proceeds to step S2a, where the indoor ambient temperature correction coefficient t and the evaporator volume correction coefficient V of the indoor unit are obtained from the lookup table based on the measured indoor ambient temperature Tai and the determined rated power. The look-up table may be determined experimentally in advance and stored in a controller or other storage device of the air conditioning system. The controller may directly look up the look-up table when performing the above method. Table 1 below is an example of a look-up table.
For example, as shown in table 1 below, in the cooling mode, when the indoor ambient temperature is less than 30 ℃ and the rated power of the air conditioning system is 0.6HP, the evaporator volume correction coefficient V is 1.5, and the indoor ambient temperature correction coefficient t is also 1.5; when the indoor ambient temperature is equal to or higher than 30 ℃ and the rated power of the air conditioning system is 0.6HP, the evaporator volume correction coefficient V is 1.5, and the indoor ambient temperature correction coefficient t is 2. In the cooling mode, when the indoor ambient temperature is less than 30 ℃ and the rated power of the air conditioning system is 2HP, the evaporator volume correction coefficient V is 2, and the indoor ambient temperature correction coefficient t is 1.5; when the indoor ambient temperature is 30 ℃ or higher and the rated power of the air conditioning system is 2HP, the evaporator volume correction coefficient V is 2 and the indoor ambient temperature correction coefficient t is also 2.
For example, as shown in table 1 below, in the heating mode, when the indoor ambient temperature is less than 15 ℃ and the rated power of the air conditioning system is 0.6HP, the evaporator volume correction coefficient V is 1.5 and the indoor ambient temperature correction coefficient t is 4; when the indoor ambient temperature is 15 ℃ or higher and the rated power of the air conditioning system is 0.6HP, the evaporator volume correction coefficient V is 1.5 and the indoor ambient temperature correction coefficient t is 3. In the heating mode, when the indoor environment temperature is less than 15 ℃ and the rated power of the air conditioning system is 2HP, the evaporator volume correction coefficient V is 2, and the indoor environment temperature correction coefficient t is 4; when the indoor ambient temperature is equal to or greater than 15 ℃ and the rated power of the air conditioning system is 2HP, the evaporator volume correction coefficient V is 2 and the indoor ambient temperature correction coefficient t is 3.
Table 1: lookup table for evaporator volume correction coefficient V and indoor environment temperature correction coefficient t
With continued reference to fig. 3, in step S3a, the compressor speed f is acquired. After obtaining the compressor rotation speed f, the indoor ambient temperature correction coefficient t, and the evaporator volume correction coefficient V, the control method proceeds to step S4a, and calculates a starting reference opening degree P1 of the expansion valve of the indoor unit using the following formula, where P1 is f × V × t. After obtaining the starting reference opening degree P1 of the expansion valve, step S5a is executed, i.e., during the starting process of the indoor unit, the expansion valve is controlled by the starting reference opening degree P1, so as to achieve the purpose of silent starting.
So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.
Claims (10)
1. A control method for reducing the starting refrigerant sound of an air conditioning system is characterized in that the air conditioning system comprises at least one indoor unit, and when any indoor unit receives a starting signal, the control method executes the following steps:
detecting the indoor environment temperature Tai of the indoor unit;
acquiring an indoor environment temperature correction coefficient t and an evaporator volume correction coefficient V of the indoor unit based on the measured indoor environment temperature Tai;
acquiring a compressor parameter f related to the rotating speed of the compressor;
calculating a starting reference opening degree P1 of an expansion valve of the indoor unit based on the compressor parameter f, the evaporator volume correction coefficient V, and the indoor ambient temperature correction coefficient t;
during the start-up of the indoor unit, the expansion valve is controlled at the start-up reference opening degree P1.
2. The control method for reducing the refrigerant sound for starting the air conditioning system as set forth in claim 1, wherein the starting reference opening degree P1 is calculated by using the following calculation formula:
P1＝f×V×t。
3. the control method for reducing the starting refrigerant sound of an air conditioning system according to claim 1 or 2,
the control method further comprises the steps of obtaining rated power of the air conditioning system;
the step of obtaining an indoor ambient temperature correction coefficient t and an evaporator volume correction coefficient V of the indoor unit based on the measured indoor ambient temperature Tai includes: and acquiring the indoor environment temperature correction coefficient t and the evaporator volume correction coefficient V of the indoor unit based on the indoor environment temperature Tai and the rated power.
4. The control method for reducing the startup refrigerant sound of an air conditioning system according to claim 3, wherein the step of obtaining the room ambient temperature correction coefficient t and the evaporator volume correction coefficient V of the indoor unit based on the room ambient temperature Tai and the rated power comprises: and acquiring the evaporator volume correction coefficient V and the indoor environment temperature correction coefficient t through a lookup table based on the indoor environment temperature Tai and the rated power.
5. The control method for reducing startup refrigerant sound of an air conditioning system according to claim 4, wherein the lookup table is pre-stored in a controller of the air conditioning system.
6. The control method for reducing the starting refrigerant noise of the air conditioning system according to claim 1 or 2, wherein the compressor parameter f includes any one of a compressor rotation speed, a compressor discharge capacity, and a compressor frequency.
7. The control method for reducing the startup refrigerant sound of the air conditioning system according to claim 1, wherein the air conditioning system is a multi-split system including a plurality of the indoor units connected in parallel.
8. An air conditioning system, characterized in that the air conditioning system comprises at least one indoor unit, and when each indoor unit is started, the control method for reducing the starting refrigerant sound of the air conditioning system according to any one of claims 1 to 7 is used for reducing the starting refrigerant sound of the indoor unit.
9. The air conditioning system as claimed in claim 8, wherein the air conditioning system is a multi-split system including a plurality of the indoor units connected in parallel.
10. Air conditioning system according to claim 8 or 9, characterized in that it has cooling and heating modes of operation.
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