CN112212471A - Air conditioning system and compressor control method thereof - Google Patents
Air conditioning system and compressor control method thereof Download PDFInfo
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- CN112212471A CN112212471A CN201910616012.XA CN201910616012A CN112212471A CN 112212471 A CN112212471 A CN 112212471A CN 201910616012 A CN201910616012 A CN 201910616012A CN 112212471 A CN112212471 A CN 112212471A
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- 238000004378 air conditioning Methods 0.000 title claims abstract description 166
- 238000000034 method Methods 0.000 title claims abstract description 50
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 43
- 238000006243 chemical reaction Methods 0.000 claims description 23
- 238000001704 evaporation Methods 0.000 claims description 6
- 230000005494 condensation Effects 0.000 claims description 5
- 238000009833 condensation Methods 0.000 claims description 5
- 230000008020 evaporation Effects 0.000 claims description 5
- 238000004364 calculation method Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 7
- 239000003507 refrigerant Substances 0.000 description 4
- 238000001514 detection method Methods 0.000 description 3
- 238000006467 substitution reaction Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 1
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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
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
- F25B49/022—Compressor control arrangements
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Abstract
The invention belongs to the technical field of heat exchange, and particularly relates to an air conditioning system and a compressor control method thereof. The invention aims to solve the problem that the existing air-conditioning system has low energy efficiency under partial working conditions due to the fact that the control mode of the existing air-conditioning system to a plurality of compressors is poor. Therefore, the air conditioning system comprises the fixed-frequency compressor and the variable-frequency compressor which are connected in parallel, so that the air conditioning system can better adapt to different working conditions; the compressor control method of the present invention includes: detecting the actual capacity percentage of the inverter compressor under the condition that the inverter compressor operates alone; when the actual capacity percentage of the variable-frequency compressor reaches a first preset variable-frequency capacity percentage, acquiring the actual load demand percentage of the compressor of the air conditioning system; according to the actual load demand percentage of the compressor of the air conditioning system, the fixed-frequency compressor is selectively operated according to different capacity percentages, so that the air conditioning system can be effectively ensured to be efficiently operated under any working condition.
Description
Technical Field
The invention belongs to the technical field of heat exchange, and particularly relates to an air conditioning system and a compressor control method thereof.
Background
Along with the continuous improvement of living standard of people, people also put forward higher and higher requirements on living environment. In order to maintain a comfortable ambient temperature, an air conditioner has become an indispensable equipment in human life. Generally, an air conditioner includes an indoor unit, an outdoor unit, and a circulation loop for connecting the indoor unit and the outdoor unit, wherein a refrigerant in the air conditioner continuously exchanges heat between the outdoor unit and the indoor unit through the circulation loop, thereby achieving an effect of changing a room temperature. Meanwhile, the refrigerant can be realized only by the aid of the auxiliary action of the compressor in the gas-liquid change process, so that the conventional air conditioner is provided with the compressor; especially for some large air conditioning systems, in order to effectively ensure the efficient operation of the air conditioning system, many air conditioning systems are often provided with a plurality of compressors. The existing air conditioning system usually directly controls a plurality of compressors to operate simultaneously, and different control is not carried out on different compressors according to the operating condition of the air conditioning system, so that the problem that the energy efficiency of the existing multi-compressor air conditioning system is low under partial working conditions is caused.
Accordingly, there is a need in the art for a new air conditioning system and a compressor control method thereof to solve the above problems.
Disclosure of Invention
In order to solve the above problems in the prior art, that is, to solve the problem that the energy efficiency of an air conditioning system is low under partial working conditions due to the poor control method of the existing air conditioning system on a plurality of compressors, the present invention provides a compressor control method for an air conditioning system, wherein the air conditioning system comprises a fixed frequency compressor and an inverter compressor which are connected in parallel, and the compressor control method comprises: detecting an actual capacity percentage of the inverter compressor under the condition that the inverter compressor is operated alone; when the actual capacity percentage of the variable-frequency compressor reaches a first preset variable-frequency capacity percentage, acquiring the actual load demand percentage of the compressor of the air conditioning system; selectively operating the fixed frequency compressor at different capacity percentages based on an actual load demand percentage of a compressor of the air conditioning system.
In the above preferred technical solution of the compressor control method for an air conditioning system, the step of selectively operating the fixed-frequency compressor at different capacity percentages according to the actual load demand percentage of the compressor of the air conditioning system includes: comparing the actual load demand percentage of the compressor of the air conditioning system with a first preset demand percentage; and if the actual load demand percentage of the compressor of the air conditioning system is greater than or equal to the first preset demand percentage, enabling the fixed-frequency compressor to operate at a first preset frequency capacity percentage.
In a preferred embodiment of the above compressor control method for an air conditioning system, after the step of operating the fixed-frequency compressor at the first preset frequency capacity percentage, the compressor control method further includes: acquiring the actual load demand percentage of the compressor of the air conditioning system again; comparing the obtained actual load demand percentage of the compressor of the air conditioning system with the first preset demand percentage; if the actual load demand percentage of the compressor of the air conditioning system is still greater than or equal to the first preset demand percentage, increasing the actual capacity percentage of the fixed-frequency compressor and repeatedly executing the obtaining and comparing steps until the actual capacity percentage of the fixed-frequency compressor is increased to a second preset capacity percentage; and/or if the actual compressor load demand percentage of the air conditioning system is less than the first preset demand percentage, stopping the fixed frequency compressor.
In a preferred embodiment of the above compressor control method for an air conditioning system, after the actual capacity percentage of the fixed-frequency compressor is increased to the second preset frequency capacity percentage, the compressor control method further includes: acquiring the actual load demand percentage of the compressor of the air conditioning system again; comparing the actual compressor load demand percentage of the air conditioning system obtained again with the first preset demand percentage; if the actual load demand percentage of the compressor of the air conditioning system obtained again is still larger than or equal to the first preset demand percentage, the actual capacity percentage of the inverter compressor is increased to a second preset inverter capacity percentage; and/or if the actual compressor load demand percentage of the air conditioning system is less than the first preset demand percentage, stopping the fixed frequency compressor.
In a preferred technical solution of the above compressor control method for an air conditioning system, after the step of "increasing the actual capacity percentage of the inverter compressor to a second preset inverter capacity percentage", the compressor control method further includes: further acquiring the actual load demand percentage of a compressor of the air conditioning system; comparing the further acquired actual load demand percentage of the compressor of the air conditioning system with a second preset demand percentage; and selectively controlling the fixed-frequency compressor and the variable-frequency compressor to work cooperatively according to the comparison result.
In a preferred embodiment of the above compressor control method for an air conditioning system, the step of selectively controlling the fixed-frequency compressor and the inverter compressor to cooperatively operate according to the comparison result includes: if the further acquired actual load demand percentage of the compressor of the air conditioning system is larger than or equal to the second preset demand percentage, enabling the fixed-frequency compressor to run at full load; and/or if the further acquired compressor actual load demand percentage of the air conditioning system is smaller than the second preset demand percentage, enabling the fixed-frequency compressor and the variable-frequency compressor to operate at the current capacity percentage.
In a preferred technical solution of the above compressor control method for an air conditioning system, the percentage of the actual load demand of the compressor of the air conditioning system is equal to the difference between the actual water temperature and the target water temperature of the air conditioning system divided by the starting temperature difference of the compressor; and/or the actual capacity percentage of the inverter compressor is equal to a first frequency conversion coefficient multiplied by the current evaporating temperature of the inverter compressor plus a second frequency conversion coefficient multiplied by the current condensing temperature of the inverter compressor plus a third frequency conversion coefficient multiplied by the current operating current of the inverter compressor; wherein the first, second and third frequency conversion coefficients are determined by a model of the inverter compressor; and/or the actual capacity percentage of the fixed-frequency compressor is equal to a first fixed-frequency coefficient multiplied by the current evaporation temperature of the fixed-frequency compressor plus a second fixed-frequency coefficient multiplied by the current condensation temperature of the fixed-frequency compressor plus a third fixed-frequency coefficient multiplied by the current operation current of the fixed-frequency compressor; wherein the first fixed frequency coefficient, the second fixed frequency coefficient and the third fixed frequency coefficient are determined by the model of the fixed frequency compressor.
In a preferable embodiment of the above compressor control method for an air conditioning system, the first preset percentage of variable frequency capacity is 50%.
In a preferred embodiment of the above compressor control method for an air conditioning system, the first preset demand percentage is 50%; and/or the first preset percentage of frequency capability is 25%.
In a preferred embodiment of the above compressor control method for an air conditioning system, the second preset frequency capacity percentage is 75%; and/or the second preset percent variable frequency capability is 75%; and/or the second preset percentage of frequency capability is 10%.
As can be understood by those skilled in the art, in the technical solution of the present invention, the air conditioning system of the present invention includes a fixed frequency compressor and an inverter compressor connected in parallel, and the compressor control method of the present invention includes: detecting an actual capacity percentage of the inverter compressor under the condition that the inverter compressor is operated alone; when the actual capacity percentage of the variable-frequency compressor reaches a first preset variable-frequency capacity percentage, acquiring the actual load demand percentage of the compressor of the air conditioning system; selectively operating the fixed frequency compressor at different capacity percentages based on an actual load demand percentage of a compressor of the air conditioning system. It should be noted that, when the inverter compressor operates at a partial load, the energy efficiency of the inverter compressor is high, and the energy saving effect is obvious, and when the inverter compressor operates at a high load or at a full load, the energy efficiency of the inverter compressor and the energy efficiency of the fixed-frequency compressor are almost not greatly different; therefore, the air conditioning system can better adapt to different working conditions by combining the fixed-frequency compressor and the variable-frequency compressor. Specifically, the air conditioning system is under the working condition of low-load operation in most working time, and the energy efficiency of the inverter compressor is high when the inverter compressor operates at partial load, so that the air conditioning system can control the inverter compressor to operate alone firstly, so that the energy efficiency of the air conditioning system is effectively improved under the condition of low load; under the condition that the actual capacity percentage of the variable frequency compressor reaches the first preset variable frequency capacity percentage, the air conditioning system can judge whether the single variable frequency compressor is enough to meet the heat exchange requirement of a user according to the actual load requirement percentage of the compressor of the air conditioning system, and under the condition that the single variable frequency compressor cannot meet the requirement of the user, the air conditioning system controls the fixed frequency compressor to operate, so that the air conditioning system can be effectively operated efficiently under any working condition.
Drawings
FIG. 1 is a flow chart of the main steps of the compressor control method of the present invention;
fig. 2 is a flowchart illustrating the detailed steps of a preferred embodiment of the compressor control method of the present invention.
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. For example, although the steps of the method of the present invention are described herein in a particular order, these orders are not limiting, and one skilled in the art may perform the steps in a different order without departing from the underlying principles of the invention.
Specifically, the air conditioning system comprises an indoor unit, an outdoor unit and a main circulation loop arranged between the indoor unit and the outdoor unit, wherein a fixed-frequency compressor and a variable-frequency compressor are arranged on the main circulation loop in a parallel connection mode; meanwhile, the air conditioning system is also provided with a heat exchange water path, and the main circulation loop is connected with the heat exchange water path, so that the refrigerant in the main circulation loop can exchange heat with the water in the heat exchange water path, and further exchange heat with the indoor air through the heat exchange water path. It can be understood by those skilled in the art that the present invention does not limit the specific number and type of the fixed frequency compressor and the variable frequency compressor, and the skilled person can set the number and type according to the actual use requirement. In addition, the invention does not limit the specific structure of the air conditioning system, and technicians can set the specific structure of the air conditioning system according to actual use requirements, as long as the air conditioning system comprises a fixed-frequency compressor and an inverter compressor which are connected in parallel.
Further, the air conditioning system of the present invention further includes a controller, where the controller is capable of acquiring detection data of each detection element, for example, acquiring detection data of a temperature sensor disposed on the heat exchange water path to acquire a water temperature in the heat exchange water path; and the controller can also control the operation of the air conditioning system, for example, control the actual operation capacity of the fixed-frequency compressor, control the actual operation capacity and operation frequency of the inverter compressor, and the like. Of course, it can be understood by those skilled in the art that the present invention does not limit the specific structure and model of the controller, and the controller may be the original controller of the air conditioning system, or may be a controller separately configured to execute the compressor control method of the present invention, and the structure and model of the controller can be set by those skilled in the art according to the actual use requirement.
Referring first to fig. 1, a flow chart of main steps of a compressor control method according to the present invention is shown. As shown in fig. 1, based on the air conditioning system described in the above embodiment, the compressor control method of the present invention mainly includes the following steps:
s1: detecting the actual capacity percentage of the inverter compressor under the condition that the inverter compressor operates alone;
s2: when the actual capacity percentage of the variable-frequency compressor reaches a first preset variable-frequency capacity percentage, acquiring the actual load demand percentage of the compressor of the air conditioning system;
s3: the fixed frequency compressor is selectively operated at different capacity percentages based on the actual load demand percentage of the compressor of the air conditioning system.
Further, in step S1, the controller may control the inverter compressor to operate prior to the fixed frequency compressor so as to detect an actual capacity percentage of the inverter compressor in case that the inverter compressor operates alone; because the inverter compressor has high energy efficiency and obvious energy-saving effect when running under partial load, the controller can firstly control the inverter compressor to run so as to effectively ensure that the air-conditioning system can ensure high energy efficiency under the condition of low load. The technical personnel in the field can understand that the invention does not limit the initial actual capacity of the inverter compressor when starting, and the technical personnel can set the capacity according to the actual use requirement; meanwhile, the invention does not limit the control mode of the inverter compressor after starting, and technicians can set the compressor control method of the inverter compressor according to actual use requirements.
Further, in step S2, first, it should be noted that, after the inverter compressor is started to operate, according to an operation requirement of the air conditioning system, the controller may perform adjustment control on an actual capacity of the inverter compressor, and when a heat exchange requirement of the air conditioning system is strong, an initial actual capacity of the inverter compressor is often difficult to meet the operation requirement of the air conditioning system, and at this time, the controller may increase the actual capacity of the inverter compressor. When the actual capacity percentage of the inverter compressor reaches a first preset inverter capacity percentage, the controller acquires the actual load demand percentage of the compressor of the air conditioning system, so that the controller can judge whether the inverter compressor is used alone enough to meet the heat exchange demand of a user according to the actual load demand percentage of the compressor of the air conditioning system. It is understood that a skilled person may set the specific value of the first preset percentage of the frequency conversion capability at will according to actual use requirements, and preferably, the first preset percentage of the frequency conversion capability is fifty percent. In addition, it should be noted that, the present invention does not set any limitation on the specific way of acquiring the actual load demand percentage of the compressor by the controller, and a technician may set the specific acquisition way according to the actual use demand, as long as the controller can judge the load demand of the air conditioning system on the compressor according to the actual load demand percentage of the compressor.
Further, in step S3, the controller can selectively operate the fixed frequency compressor at different capacity percentages based on an actual compressor load demand percentage of the air conditioning system. It can be understood that, the controller can judge whether the inverter compressor is used alone by the air conditioning system to meet the heat exchange requirement of a user when the actual capacity percentage of the inverter compressor reaches the first preset inverter capacity percentage according to the actual load demand percentage of the compressor of the air conditioning system, and the controller controls the fixed-frequency compressor to operate according to different capacity percentages under the condition that the inverter compressor is used alone to fail to meet the requirement of the user, so that the air conditioning system can be effectively ensured to operate efficiently under any working condition. It should be noted that, the present invention does not limit the specific determination method used in this step, for example, the controller may compare the actual load demand percentage of the compressor of the air conditioning system with the preset demand percentage, or may substitute the actual load demand percentage of the compressor of the air conditioning system into a relational expression for determination, and a technician may set the specific determination method according to the actual use demand.
Referring now to fig. 2, a flowchart illustrating the steps of a preferred embodiment of the compressor control method of the present invention is shown. As shown in fig. 2, based on the air conditioning system described in the foregoing embodiment, a preferred embodiment of the compressor control method of the present invention specifically includes the following steps:
s101: detecting the actual capacity percentage of the inverter compressor under the condition that the inverter compressor operates alone;
s102: judging whether the actual capacity percentage of the inverter compressor is greater than or equal to fifty percent; if yes, executing step S105; if not, executing step S103;
s103: judging whether the difference value between the actual water temperature and the target water temperature is equal to zero or not; if yes, executing step S104; if not, executing step S101 again;
s104: stopping the variable frequency compressor;
s105: acquiring the actual load demand percentage of a compressor of an air conditioning system;
s106: determining whether the compressor actual load demand percentage is greater than or equal to fifty percent; if yes, go to step S108; if not, executing step S107;
s107: keeping the variable frequency compressor running at fifty percent of capacity;
s108: operating the fixed frequency compressor at twenty-five percent capacity;
s109: acquiring the actual load demand percentage of the compressor of the air conditioning system again;
s110: determining whether the compressor actual load demand percentage is greater than or equal to fifty percent; if yes, executing step S111; if not, go to step S122;
s111: operating a fixed frequency compressor at fifty percent capacity;
s112: acquiring the actual load demand percentage of the compressor of the air conditioning system again;
s113: determining whether the compressor actual load demand percentage is greater than or equal to fifty percent; if yes, go to step S114; if not, go to step S122;
s114: operating the fixed frequency compressor at seventy-five percent capacity;
s115: acquiring the actual load demand percentage of the compressor of the air conditioning system again;
s116: determining whether the compressor actual load demand percentage is greater than or equal to fifty percent; if so, go to step S117; if not, go to step S122;
s117: operating the inverter compressor at seventy-five percent capacity;
s118: acquiring the actual load demand percentage of the compressor of the air conditioning system again;
s119: judging whether the actual load demand percentage of the compressor is more than or equal to ten percent; if yes, go to step S120; if not, go to step S121;
s120: operating the fixed frequency compressor at full load;
s121: operating both the variable frequency compressor and the fixed frequency compressor at the current capacity percentage;
s122: the fixed-frequency compressor is stopped.
Further, in step S101, when the air conditioning system is started, the controller may control the inverter compressor to start before the fixed-frequency compressor, so as to effectively ensure that the air conditioning system also has high energy efficiency during low-load operation; in the case where the inverter compressor is operated alone, the controller can detect an actual capacity percentage of the inverter compressor. It should be noted that, through recent statistical data, it is found that the time of the full load operation of the air conditioning system usually only accounts for 1.4% of the total operation time when calculated according to the european algorithm, and the proportion of the time of the full load operation of the air conditioning system to the total operation time when calculated according to the american algorithm is less than 0.5%; therefore, the air conditioning system needs to control the operation conditions of different compressors according to the load condition of the air conditioning system, so that the energy efficiency of the air conditioning system is effectively improved, and the air conditioning system can be effectively ensured to keep high energy efficiency under various working conditions. In addition, it should be noted that, the present invention does not limit the initial capacity percentage of the inverter compressor at the time of starting, and the technician can set the initial capacity percentage according to the actual use requirement.
Further, in step S102, since the actual capacity percentage of the inverter compressor is less than fifty percent, the energy efficiency of the inverter compressor is usually significantly higher than that of the fixed-frequency compressor; therefore, after the inverter compressor is started to operate, the controller can judge whether the actual capacity percentage of the inverter compressor is greater than or equal to fifty percent so as to judge whether the controller should increase the actual capacity percentage of the inverter compressor or should start the fixed frequency compressor. It can be understood by those skilled in the art that, although the percentage of the first preset frequency conversion capability in the preferred embodiment is fifty percent, it is obvious that the specific value of the percentage of the first preset frequency conversion capability can be set by those skilled in the art according to the actual use requirement. In addition, it should be noted that, a technician may set a calculation manner of an actual capacity percentage of the inverter compressor according to an actual use requirement, as an embodiment, the calculation manner of the actual capacity percentage of the inverter compressor is as follows:
Qa*100％＝k1*Tev+k2*Tco+k3*Ac
wherein k1 is a first frequency conversion coefficient, k2 is a second frequency conversion coefficient, k3 is a third frequency conversion coefficient, and the first frequency conversion coefficient, the second frequency conversion coefficient and the third frequency conversion coefficient are all determined by the specific model of the inverter compressor; tev is the current evaporation temperature of the variable frequency compressor, and the unit is; tco is the current condensation temperature of the variable frequency compressor, and the unit is; a. thecThe unit of the current running current of the variable frequency compressor is A.
It should be noted that, a technician needs to determine specific values of the first frequency conversion coefficient, the second frequency conversion coefficient and the third frequency conversion coefficient according to a specific model of the inverter compressor; meanwhile, the invention does not limit the concrete mode of the controller for acquiring the current evaporation temperature, the current condensation temperature and the current running current of the inverter compressor, and technicians can set the modes according to actual use requirements. In addition, it should be noted that the actual capacity percentage of the fixed-frequency compressor may also be calculated by referring to the above calculation formula, and a technician only needs to replace the parameters in the above calculation formula with the corresponding parameters of the fixed-frequency compressor; meanwhile, the three coefficients involved in the above calculation formula also need to be determined according to the specific model of the fixed-frequency compressor.
Further, if the actual capacity percentage of the inverter compressor does not reach fifty percent, step S103 is executed, that is, the controller may obtain the actual water temperature of the heat exchange water path, calculate a difference between the actual water temperature and the target water temperature set by the user, and determine whether the difference is equal to zero, that is, whether the actual water temperature of the heat exchange water path is equal to the target water temperature set by the user. If the actual water temperature of the heat exchange water path is equal to the target water temperature set by the user, the fact that the air conditioning system can meet the heat exchange requirement of the user is indicated, and the water temperature in the heat exchange water path cannot be rapidly reduced due to the large specific heat capacity of water; in this case, step S104 is executed, that is, the controller controls the inverter compressor to stop, so as to maintain the heat exchange effect by using the residual heat in the heat exchange water path, thereby effectively achieving the energy saving effect. If the actual water temperature of the heat exchange water channel is not equal to the target water temperature set by the user, the fact that the air conditioning system does not meet the heat exchange requirement of the user is indicated, and the water in the heat exchange water channel needs to further exchange heat with a refrigerant; in this case, the controller may perform step S101 again after changing the operation parameters of the inverter compressor. For example, the controller may further increase the actual capacity percentage of the inverter compressor, and as an embodiment, the controller may control the actual capacity percentage of the inverter compressor according to a difference between the actual water temperature and the target water temperature. Specifically, the controller may control a change amplitude of an actual capacity percentage of the inverter compressor and a time during which the inverter compressor continues to operate at each capacity percentage by a difference between the actual water temperature and the target water temperature, where a specific control logic is: the larger the difference between the actual water temperature and the target water temperature is, the faster the lifting speed of the actual capacity percentage of the inverter compressor is, and the shorter the continuous operation time of the inverter compressor under the relatively lower actual capacity percentage is; conversely, the smaller the difference between the actual water temperature and the target water temperature, the slower the increasing speed of the actual capacity percentage of the inverter compressor, and the longer the operation duration of the inverter compressor at the relatively lower actual capacity percentage. It should be noted that, in the entire compressor control method of the present invention, the controller may adopt the control logic when adjusting the actual capacity percentages of the inverter compressor and the fixed-frequency compressor, and of course, the control logic is not limited, and a technician may set the specific control logic according to actual use requirements.
Further, in step S105, if the actual capacity percentage of the inverter compressor has reached fifty percent, the controller can obtain the compressor actual load demand percentage of the air conditioning system; it should be noted that, a technician may set a specific calculation method of the actual load demand percentage of the compressor of the air conditioning system according to an actual use demand, and as an embodiment, the calculation method of the actual load demand percentage of the compressor of the air conditioning system is as follows:
m*100％＝(Ta-Tt)/Tdiff
wherein, TaThe actual water temperature of a heat exchange waterway of the air conditioning system is measured in units of; t istThe unit is the target water temperature of the air conditioning system; t isdiffThe temperature difference at the start of the compressor is given in degrees centigrade.
It should be noted that the starting temperature difference of the compressor needs to be set by a technician according to actual use requirements, and meanwhile, when the difference between the actual water temperature and the target water temperature is greater than the starting temperature difference of the compressor, the actual load requirement percentage of the compressor of the air conditioning system is directly determined as 100%.
Further, in step S106, if the controller determines that the actual load demand percentage of the compressor of the air conditioning system is less than fifty percent, it indicates that it is sufficient to only maintain the current capacity percentage of the inverter compressor, that is, to meet the heat exchange demand of the user, in this case, step S107 is executed, that is, the controller controls the inverter compressor to maintain the capacity operation of fifty percent. Meanwhile, if the controller determines that the actual load demand percentage of the compressor of the air conditioning system is greater than or equal to fifty percent, it indicates that the heat exchange demand of the user cannot be met only by maintaining the current capacity percentage of the inverter compressor, in this case, step S108 is executed, that is, the controller controls the start of the fixed-frequency compressor and operates at twenty-five percent of capacity, so as to effectively meet the heat exchange demand of the user. It should be noted that, although the percentage of the first preset requirement is fifty percent in the preferred embodiment, it is obvious for a skilled person to set the specific value of the percentage of the first preset requirement according to the actual use requirement. Meanwhile, although the percentage of the first preset frequency capacity is twenty-five percent in the preferred embodiment, it is obvious for a skilled person to set the specific value of the percentage of the first preset frequency capacity according to the actual use requirement.
Further, after the fixed-frequency compressor operates at twenty-five percent of capacity, step S109 is executed, that is, the controller can obtain the actual load demand percentage of the compressor of the air conditioning system again, so as to determine whether the current heat exchange capacity of the air conditioning system is sufficient to meet the heat exchange demand of the user. In step S110, if the controller determines that the actual load demand percentage of the compressor of the air conditioning system is less than fifty percent, it indicates that the heat exchange capacity of the air conditioning system at this time is sufficient to meet the heat exchange demand of the user, in this case, in order to save energy effectively, step S122 is executed, that is, the controller can control the constant-frequency compressor to stop, and only the inverter compressor is used to participate in heat exchange. If the controller judges that the actual load demand percentage of the compressor of the air conditioning system is greater than or equal to fifty percent, the heat exchange capacity of the air conditioning system at the moment is not enough to meet the heat exchange demand of a user, in this case, step S111 is executed, that is, the controller can control the constant-frequency compressor to operate at the capacity of fifty percent, so as to effectively improve the heat exchange capacity of the air conditioning system.
Further, after the fixed-frequency compressor is operated at fifty percent capacity, step S112 is executed, that is, the controller can obtain the actual compressor load demand percentage of the air conditioning system again, so as to determine whether the current heat exchange capacity of the air conditioning system is sufficient to meet the heat exchange demand of the user. In step S113, if the controller determines that the actual load demand percentage of the compressor of the air conditioning system is less than fifty percent, it indicates that the heat exchange capacity of the air conditioning system at this time is sufficient to meet the heat exchange demand of the user, in this case, in order to save energy effectively, step S122 is executed, that is, the controller can control the constant-frequency compressor to stop, and only the inverter compressor is used to participate in heat exchange. If the controller determines that the actual load demand percentage of the compressor of the air conditioning system is greater than or equal to fifty percent, it indicates that the heat exchange capacity of the air conditioning system at the moment is not enough to meet the heat exchange demand of the user, in this case, step S114 is executed, that is, the controller can control the fixed-frequency compressor to operate at seventy-five percent of capacity, so as to effectively improve the heat exchange capacity of the air conditioning system. It can be understood by those skilled in the art that, although the second preset frequency capacity percentage is seventy-five percent in the preferred embodiment, it is obvious that the specific value of the second preset frequency capacity percentage can be set by those skilled in the art according to the actual use requirement; meanwhile, although the actual capacity percentage of the fixed-frequency compressor is not directly increased from the first preset frequency capacity percentage to the second preset frequency capacity percentage in the preferred embodiment, obviously, a technician may set a specific process for increasing the actual capacity percentage of the fixed-frequency compressor from the first preset frequency capacity percentage to the second preset frequency capacity percentage according to actual use requirements.
Further, after the fixed-frequency compressor operates at seventy-five percent of capacity, step S115 is executed, that is, the controller can obtain the actual load demand percentage of the compressor of the air conditioning system again, so as to determine whether the current heat exchange capacity of the air conditioning system is sufficient to meet the heat exchange demand of the user. In step S116, if the controller determines that the actual load demand percentage of the compressor of the air conditioning system is less than fifty percent, it indicates that the heat exchange capacity of the air conditioning system at this time is sufficient to meet the heat exchange demand of the user, in this case, in order to effectively achieve the energy saving effect, step S122 is executed, that is, the controller can control the constant-frequency compressor to stop, and only use the inverter compressor to participate in heat exchange. If the controller judges that the actual load demand percentage of the compressor of the air conditioning system is still greater than or equal to fifty percent, it indicates that the heat exchange capacity of the air conditioning system at the moment is not enough to meet the heat exchange demand of the user, in this case, step S117 is executed, that is, the controller increases the actual operation capacity of the inverter compressor to seventy-five percent, so as to effectively increase the heat exchange capacity of the air conditioning system. It should be noted that, although the second predetermined percentage of the frequency conversion capability in the preferred embodiment is seventy-five percent, it is obvious to a skilled person that the specific value of the second predetermined percentage of the frequency conversion capability can be set according to the actual use requirement.
Further, after the inverter compressor and the fixed frequency compressor both operate at seventy-five percent of capacity, step S118 is executed, that is, the controller can obtain the actual load demand percentage of the compressor of the air conditioning system again, so as to determine whether the current heat exchange capacity of the air conditioning system is sufficient to meet the heat exchange demand of the user. In step S119, since the inverter compressor and the fixed-frequency compressor are both in the high-load operation state at this time, it indicates that the air conditioning system needs a higher heat exchange capacity to meet the heat exchange requirement of the user, and in this case, in order to effectively ensure the heat exchange effect of the air conditioning system, the controller needs to determine whether the actual load requirement percentage of the compressor of the air conditioning system is greater than or equal to ten percent. If the controller judges that the actual load demand percentage of the compressor of the air conditioning system is less than ten percent, the heat exchange capacity of the air conditioning system at the moment is enough to meet the heat exchange demand of a user, in this case, in order to effectively ensure the high heat exchange capacity of the air conditioning system, step S121 is executed, namely the controller can control the variable frequency compressor and the fixed frequency compressor to operate at the current capacity percentage, and further the heat exchange capacity of the air conditioning system can be effectively ensured to always meet the heat exchange demand of the user. Meanwhile, if the controller judges that the actual load demand percentage of the compressor of the air conditioning system is greater than or equal to ten percent, it indicates that the heat exchange capacity of the air conditioning system at the moment is still insufficient to meet the heat exchange demand of a user, in this case, in order to further improve the heat exchange capacity of the air conditioning system, step S120 is executed, that is, the controller controls the constant-frequency compressor to operate at full load, that is, the actual operation capacity of the constant-frequency compressor is improved to one hundred percent, so as to further improve the heat exchange capacity of the air conditioning system.
It should be noted that, although the second predetermined percentage of demand in the preferred embodiment is ten percent, it is obvious for a skilled person to set the specific value of the second predetermined percentage of demand according to the actual use requirement. In addition, under the condition that the inverter compressor runs at seventy-five percent of capacity and the fixed-frequency compressor runs at full load, if the heat exchange capacity of the air conditioning system is still insufficient to meet the heat exchange requirement of a user, the controller can also control the inverter compressor to run at full load so as to improve the heat exchange capacity of the air conditioning system to the maximum extent.
Finally, it should be noted that the above examples are all preferred embodiments of the present invention, and should not be construed as limiting the scope of the present invention. When the present invention is actually used, a part of the steps may be added or deleted as needed or the order between the different steps may be changed by those skilled in the art. Such variations are not to be regarded as a departure from the spirit and scope of the invention.
So far, the preferred embodiments of the present invention have been described in conjunction with the accompanying drawings, but it is apparent to those skilled in the art that the scope of the present invention is 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 compressor control method for an air conditioning system, wherein the air conditioning system comprises a fixed-frequency compressor and an inverter compressor which are connected in parallel, the compressor control method comprising:
detecting the actual capacity percentage of the inverter compressor under the condition that the inverter compressor operates alone;
when the actual capacity percentage of the variable-frequency compressor reaches a first preset variable-frequency capacity percentage, acquiring the actual load demand percentage of the compressor of the air conditioning system;
selectively operating the fixed frequency compressor at different capacity percentages based on an actual load demand percentage of a compressor of the air conditioning system.
2. The compressor control method of claim 1, wherein the step of selectively operating the fixed frequency compressor at different capacity percentages based on the percentage of actual compressor load demand of the air conditioning system comprises:
comparing the actual load demand percentage of the compressor of the air conditioning system with a first preset demand percentage;
and if the actual load demand percentage of the compressor of the air conditioning system is greater than or equal to the first preset demand percentage, enabling the fixed-frequency compressor to operate at a first preset frequency capacity percentage.
3. The compressor control method of claim 2, wherein after the step of operating the fixed frequency compressor at a first preset frequency capacity percentage, the compressor control method further comprises:
acquiring the actual load demand percentage of the compressor of the air conditioning system again;
comparing the obtained actual load demand percentage of the compressor of the air conditioning system with the first preset demand percentage;
if the actual load demand percentage of the compressor of the air conditioning system is still greater than or equal to the first preset demand percentage, increasing the actual capacity percentage of the fixed-frequency compressor and repeatedly executing the obtaining and comparing steps until the actual capacity percentage of the fixed-frequency compressor is increased to a second preset capacity percentage; and/or
And if the actual load demand percentage of the compressor of the air conditioning system is smaller than the first preset demand percentage, stopping the fixed-frequency compressor.
4. The compressor control method of claim 3, wherein after the actual capacity percentage of the fixed-frequency compressor is increased to the second preset frequency capacity percentage, the compressor control method further comprises:
acquiring the actual load demand percentage of the compressor of the air conditioning system again;
comparing the actual compressor load demand percentage of the air conditioning system obtained again with the first preset demand percentage;
if the actual load demand percentage of the compressor of the air conditioning system obtained again is still larger than or equal to the first preset demand percentage, the actual capacity percentage of the inverter compressor is increased to a second preset inverter capacity percentage; and/or
And if the actual load demand percentage of the compressor of the air conditioning system is smaller than the first preset demand percentage, stopping the fixed-frequency compressor.
5. The compressor control method according to claim 4, wherein after the step of "increasing the actual capacity percentage of the inverter compressor to a second preset inverter capacity percentage", the compressor control method further comprises:
further acquiring the actual load demand percentage of a compressor of the air conditioning system;
comparing the further acquired actual load demand percentage of the compressor of the air conditioning system with a second preset demand percentage;
and selectively controlling the fixed-frequency compressor and the variable-frequency compressor to work cooperatively according to the comparison result.
6. The compressor control method of claim 5, wherein the step of selectively controlling the fixed frequency compressor and the inverter compressor to cooperate according to the comparison result comprises:
if the further acquired actual load demand percentage of the compressor of the air conditioning system is larger than or equal to the second preset demand percentage, enabling the fixed-frequency compressor to run at full load; and/or
And if the further acquired actual load demand percentage of the compressor of the air conditioning system is smaller than the second preset demand percentage, enabling the fixed-frequency compressor and the variable-frequency compressor to operate at the current capacity percentage.
7. The compressor control method according to any one of claims 1 to 6, wherein the compressor actual load demand percentage of the air conditioning system is equal to a difference between an actual water temperature of the air conditioning system and a target water temperature divided by a start-up temperature difference of a compressor; and/or
The actual capacity percentage of the inverter compressor is equal to a first frequency conversion coefficient multiplied by the current evaporation temperature of the inverter compressor plus a second frequency conversion coefficient multiplied by the current condensation temperature of the inverter compressor plus a third frequency conversion coefficient multiplied by the current operating current of the inverter compressor; wherein the first, second and third frequency conversion coefficients are determined by a model of the inverter compressor; and/or
The actual capacity percentage of the fixed-frequency compressor is equal to a first fixed-frequency coefficient multiplied by the current evaporation temperature of the fixed-frequency compressor plus a second fixed-frequency coefficient multiplied by the current condensation temperature of the fixed-frequency compressor plus a third fixed-frequency coefficient multiplied by the current operation current of the fixed-frequency compressor; wherein the first fixed frequency coefficient, the second fixed frequency coefficient and the third fixed frequency coefficient are determined by the model of the fixed frequency compressor.
8. The compressor control method according to any one of claims 1 to 6, wherein the first preset percent variable frequency capacity is 50%.
9. The compressor control method according to any one of claims 2 to 6, wherein the first preset demand percentage is 50%; and/or
The first predetermined percentage of frequency capability is 25%.
10. The compressor control method according to claim 5 or 6, characterized in that the second preset frequency capacity percentage is 75%; and/or
The second preset percent variable frequency capability is 75%; and/or
The second predetermined percentage of frequency capability is 10%.
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