CN101876475A - Method and system for controlling central air-conditioning - Google Patents
Method and system for controlling central air-conditioning Download PDFInfo
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- CN101876475A CN101876475A CN 201010185261 CN201010185261A CN101876475A CN 101876475 A CN101876475 A CN 101876475A CN 201010185261 CN201010185261 CN 201010185261 CN 201010185261 A CN201010185261 A CN 201010185261A CN 101876475 A CN101876475 A CN 101876475A
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Abstract
The invention relates to a central air-conditioning and provides a method for controlling the central air-conditioning. The method comprises the following steps of: arranging an variable frequency compressor and a constant frequency compressor in parallel in the central air-conditioning; when the air-conditioning energy requirement is lower than the output energy of the constant frequency compressor at the beginning of starting the central air-conditioning, only starting the variable frequency compressor; and when the output power needs to be increased and the energy requirement of the air-conditioning is higher than the output energy of the variable frequency compressor, starting the constant frequency compressor after the variable frequency compressor runs to the highest frequency. The invention also provides a variable frequency and constant frequency combined central air-conditioning system. The method for controlling the central air-conditioning solves the technical problems of low output power of an variable frequency air-conditioning, low refrigeration and heating speed of the central air-conditioning, frequent startup and shutdown around a target temperature, large grid impact, incapability of realizing an air-conditioning water heater system, high manufacturing cost and the like, thereby providing a more convenient and more comfortable living environment for users.
Description
Technical field
The present invention relates to central air-conditioning, specially refer to a kind of control method and system of the central air-conditioning with frequency conversion, fixed combination frequently.
Background technology
Central air conditioner system is made up of cold and heat source system and air handling system.Refrigeration system provides institute's chilling requirement for air handling system, in order to offset the refrigeration duty of indoor environment; Heating provides in order to offset the heat of indoor environment thermic load for air handling system.Refrigeration system is the vital part of central air conditioner system, wherein, refrigeration compressor is the core and the heart of refrigeration system, and it adopts kind, the method for operation, version etc. directly to influence the economy that central air conditioner system is in operation, high efficiency, reasonability.
Existing central air-conditioning has the following disadvantages:
1, adopt invariable frequency compressor under specific rotation speeds, to work, not only cooling and warming speed is slow, and near cooling and warming temperature set-point (target temperature) frequent start-stop, cause fluctuate in the service area big (about 4 ℃), the temperature control comfortableness is relatively poor, and the loss of frequent starting increase electric energy, its service life is shortened in the wearing and tearing of aggravation moving component.
When 2, the invariable frequency compressor on-load directly starts, not only electrical network is impacted greatlyyer, cause falling of electrical network terminal voltage and cause the flicker of consumer.
3, fixed central air-conditioning frequently can not be realized air-conditioning water heater system too slowly because of regulating temperature.
4, variable-frequency central air conditioner, unit are only used a DC frequency-changeable compressor, owing to be subjected to also corresponding being restricted of power output of the whole unit of separate unit compressor displacement quantitative limitation (present maximum is 6P just), can not satisfy the demand; If unit uses many DC frequency-changeable compressors, then cooling and warming and electrical control are just very complicated, and manufacturing and maintenance cost are higher, are difficult for being accepted by market.
Therefore, to have above-mentioned problem be the technical problem that needs to be resolved hurrily in the industry to existing central air-conditioning.
Summary of the invention
Main purpose of the present invention provides a kind of with the frequency conversion control method and the system of the central air-conditioning of combination frequently surely, is intended to solve that existing central air-conditioning cooling and warming speed is slow, frequent start-stop, electrical network impact big and manufacturing cost high-technology problem near the target temperature.
Technical scheme provided by the invention is: a kind of control method of central air-conditioning may further comprise the steps:
Frequency-changeable compressor and invariable frequency compressor are arranged in parallel in central air-conditioning;
When just starting, when the air conditioner energy demand is exported energy less than invariable frequency compressor, only open frequency-changeable compressor;
In needs rising power output, when air conditioner energy demand during greater than frequency-changeable compressor output energy, allow frequency-changeable compressor run to highest frequency after, open invariable frequency compressor again.
Preferably, also comprise step: after opening invariable frequency compressor, when air conditioner energy need be exported energy less than invariable frequency compressor, close invariable frequency compressor.
Preferably, described allow frequency-changeable compressor run to highest frequency after, the step of opening invariable frequency compressor again is specially: delay time a period of time after frequency-changeable compressor runs to highest frequency, open invariable frequency compressor again.
Preferably, when air conditioner energy need be exported energy less than invariable frequency compressor, close preceding time-delay a period of time of described invariable frequency compressor.
Adopt the linear regulation frequency when preferably, described frequency-changeable compressor increases energy.
Preferably, described when air conditioner energy demand during greater than frequency-changeable compressor output energy, allow frequency-changeable compressor run to highest frequency after, open again in the step of invariable frequency compressor, open the frequency that invariable frequency compressor reduces frequency-changeable compressor simultaneously.
The present invention also provides a kind of frequency conversion central air conditioner system of combination frequently surely, comprise control system and the compressor that is connected successively, condenser, expansion valve, evaporimeter, wherein, described compressor is the hybrid compressor that at least one frequency-changeable compressor and at least one invariable frequency compressor are connected by parallel way;
When just starting, when the air conditioner energy demand is exported energy less than invariable frequency compressor, only open frequency-changeable compressor;
In needs rising power output, when air conditioner energy demand during greater than frequency-changeable compressor output energy, allow frequency-changeable compressor run to highest frequency after, open invariable frequency compressor again;
After opening invariable frequency compressor, when air conditioner energy need be exported energy less than invariable frequency compressor, close invariable frequency compressor.
Preferably, described frequency-changeable compressor, invariable frequency compressor are connected in series an oil eliminator and a check valve respectively.
Preferably, described hybrid compressor is that a frequency-changeable compressor and a plurality of invariable frequency compressor are connected in parallel.
Preferably, described condenser is outdoor air-cooled heat exchanger, and described evaporimeter is outdoor oil-to-water heat exchanger.
Preferably, the output of described hybrid compressor is connected with a cross valve, and described cross valve, outdoor air-cooled heat exchanger, an expansion valve, outdoor oil-to-water heat exchanger couple together by circular pattern.
Preferably, supply with described outdoor oil-to-water heat exchanger by water as cold and hot exchange media, the water that will carry out after the cold and hot exchange by a water pump is transported to indoor air-cooled heat exchanger, and the water that comes out from this indoor air-cooled heat exchanger flow to a described outdoor oil-to-water heat exchanger or a tank.
Preferably, described outdoor oil-to-water heat exchanger is connected with a hot water apparatus by a valve.
Preferably, described hot water apparatus comprises the container of stored hot water and can carry out the running water pipe that water temperature is regulated.
Compared with prior art, the present invention is applied to frequency-changeable compressor and invariable frequency compressor combination in the central air-conditioning, have variable-frequency central air conditioner and the fixed advantage that central air-conditioning had frequently simultaneously, realize the complementation on the technical advantage separately, make this frequency conversion surely frequently hybrid central air-conditioning solved that the convertible frequency air-conditioner power output is low, central air-conditioning cooling and warming speed is slow, near the target temperature frequent start-stop, electrical network impact big, can not realize air-conditioning water heater system and manufacturing cost high-technology problem, thereby provide convenient and more comfortable living environment to the user.
Description of drawings
Fig. 1 is the flow chart of preferred embodiment method of the present invention;
Fig. 2 is for the present invention becomes, the fixed curve map of control frequently;
Fig. 3 is preferred embodiments of the present invention system connection diagram;
Fig. 4 is a preferred embodiments software control flow chart of the present invention.
The realization of the object of the invention, functional characteristics and advantage will be in conjunction with the embodiments, are described further with reference to accompanying drawing.
The specific embodiment
The tradition compressor of air conditioner relies on it constantly " to open, stop " to adjust indoor temperature, and one is opened one and caused room temperature sometimes hot and sometimes cold easily between stopping, and consumes more electric energy.Convertible frequency air-conditioner then relies on the speed of compressor of air conditioner rotating speed to reach the purpose of control room temperature, and the room temperature fluctuation is little, power consumption is few, and its comfort level improves greatly.The core of convertible frequency air-conditioner is a frequency converter.Frequency converter is realized the automatic adjusting of motor operation frequency by the conversion to electric current, the fixedly mains frequency of 50Hz is changed into the change frequency of 30-130Hz; Simultaneously, also make the supply voltage scope reach 142-270V, thoroughly solved owing to the line voltage shakiness causes the inoperable difficult problem of air-conditioner.The present invention combines frequency-changeable compressor and invariable frequency compressor can remedy separately deficiency.
Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
As shown in Figure 1, a kind of preferred embodiments of control method of central air-conditioning may further comprise the steps:
Step S10: frequency-changeable compressor and invariable frequency compressor are arranged in parallel in central air-conditioning, help controlling respectively frequency-changeable compressor and invariable frequency compressor like this.
Step S20: when just starting, when the air conditioner energy demand is exported energy less than invariable frequency compressor, only open frequency-changeable compressor; Because the frequency-changeable compressor starting load is wanted steadily, starting current is little simultaneously, and electrical network impacts less, in addition, when just opening air-conditioning or the cold air that needs, hot gas not for a long time, only open frequency-changeable compressor institute's energy requirement just can be provided;
Step S30: in needs rising power output, when air conditioner energy demand during greater than frequency-changeable compressor output energy, allow frequency-changeable compressor run to highest frequency after, open invariable frequency compressor again; After opening air-conditioning, need to be increased to higher power, surpass under the peak power situation of frequency-changeable compressor.
Preferably, also can include step S40: after opening invariable frequency compressor, when air conditioner energy need be exported energy less than invariable frequency compressor, close invariable frequency compressor; The power of air-conditioning output is big and be higher than the peak power of frequency-changeable compressor after the step S30, at this moment reduces energy output if desired, only need close one or more invariable frequency compressors and get final product, and is controlled the variation of institute's energy requirement again by frequency-changeable compressor.
Preferably, after frequency-changeable compressor runs to highest frequency, delay time a period of time, open invariable frequency compressor again.As shown in Figure 2, time T 1 is for frequency-changeable compressor runs to highest frequency, and at this moment delay time 3 minutes (T1+3) opens invariable frequency compressor more again when waiting for pressure stability.
Preferably, when air conditioner energy need be exported energy less than invariable frequency compressor, before closing invariable frequency compressor, delay time a period of time.As shown in Figure 2, invariable frequency compressor is closed in operation when T2, but system can close invariable frequency compressor after (T2+3) in 3 minutes by automatic time delay again, can effectively prevent the invariable frequency compressor frequent start-stop like this, cause fluctuate in the service area big (about 4 ℃), the temperature control comfortableness is relatively poor, and frequent starting increases the loss of electric energy, the wearing and tearing of aggravation moving component, the service life of shortening invariable frequency compressor.
Preferably, above-mentioned frequency-changeable compressor adopts the linear regulation frequency when increasing energy, can increase power output at leisure, makes temperature slowly raise or reduces, and can not allow the people feel to neglect heat and neglect cold.
Preferably, when air conditioner energy demand during greater than frequency-changeable compressor output energy, allow frequency-changeable compressor run to highest frequency after, open invariable frequency compressor again, reduce the frequency of frequency-changeable compressor when opening invariable frequency compressor, can make full use of the power output of invariable frequency compressor.
As shown in Figure 3, the present invention also provides a kind of frequency conversion central air conditioner system of combination frequently surely, comprise control system and devices such as the compressor that is connected successively, condenser, expansion valve, evaporimeter, throttling arrangement, wherein, described compressor is the hybrid compressor that at least one frequency-changeable compressor 2 and at least one invariable frequency compressor 1 are connected by parallel way.It is control like this by software: when just starting, when the air conditioner energy demand is exported energy less than invariable frequency compressor, only open frequency-changeable compressor; In needs rising power output, when air conditioner energy demand during greater than frequency-changeable compressor output energy, allow frequency-changeable compressor run to highest frequency after, open invariable frequency compressor again; After opening invariable frequency compressor, when air conditioner energy need be exported energy less than invariable frequency compressor, close invariable frequency compressor.Can separate or mix two kinds of different compressors of control like this and realize described function.
Preferably, above-mentioned frequency-changeable compressor 2, invariable frequency compressor 1 are connected in series an oil eliminator 3 and a check valve 4 respectively, make frequency-changeable compressor 2 and invariable frequency compressor 1 can distinguish separating oil, help like this controlling respectively, oil eliminator 3 can leave the oil content that mixes, because system is provided with a plurality of compressors, in order to prevent the compressor coolant backflow, adds check valve in the oil eliminator rear end of each compressor.
Preferably, the hybrid compressor that frequency-changeable compressor 2 and invariable frequency compressor 1 are formed is that a frequency-changeable compressor 2 and a plurality of invariable frequency compressor 1 are connected in parallel, only need a frequency-changeable compressor 2 just passable, avoided the installation of a plurality of frequency-changeable compressors 2 and control to get up difficult like this.
Preferably, above-mentioned condenser is outdoor air-cooled heat exchanger 9, and above-mentioned evaporimeter is outdoor oil-to-water heat exchanger 11; The output of above-mentioned hybrid compressor is connected with cross valve 7, and this cross valve 7, outdoor air-cooled heat exchanger 9, expansion valve 10, outdoor oil-to-water heat exchanger 11 couple together by circular pattern, makes refrigerant backflow utilization capable of circulation.Condenser among the present invention, evaporimeter and traditional condenser, evaporimeter are distinguished to some extent, but are fit to the use of central air conditioning.
Preferably, supply with described outdoor oil-to-water heat exchanger 11 by water as cold and hot exchange media, the water that will carry out after the cold and hot exchange by a water pump 12 is transported to indoor air-cooled heat exchanger 13, and the water that comes out from this indoor air-cooled heat exchanger 13 flow to a described outdoor oil-to-water heat exchanger 11 or a tank water storage; Cold and hot exchange media water is underground water or running water, underground water relatively more suitable use the cool in summer and warm in winter.
Preferably, described outdoor oil-to-water heat exchanger 11 is connected with a hot water apparatus 15 by a valve 14, if in refrigeration the time, and valve-off 14, the water by indoor air-cooled heat exchanger 13 is back to confession repetitive cycling utilization in underground water or the tank; If in heating, open valve 14, the water by indoor air-cooled heat exchanger flow to hot water apparatus 15 and uses hot water for the user.
Preferably, above-mentioned hot water apparatus 15 comprises the container of stored hot water and can carry out the running water pipe that water temperature is regulated, and the user can water temperature as required set, and mixes the adjusting temperature by running water pipe control cold water with hot water in the container.
Also wait the compressor operation situation of monitoring at compressor delivery outlet installation high-pressure switch, exhaust gas temperature sensor, need take to fall the frequency-changeable compressor frequency earlier when checking hypertonia, if pressure is also too high, the method for stopping compressor reduces system pressure.In the operation, relative frequency-changeable compressor should be followed and decide frequency and close the principle of afterwards opening earlier, prevent frequency-changeable compressor because of system pressure too high and unstable startup fail.
The course of work of the present invention: oil storage tank 6 directly or by an oil return solenoid valve 8 provides oil to frequency-changeable compressor 2 and a plurality of invariable frequency compressor 1, compressor is compressed into the saturated gas of HTHP (as: ammonia or fluorine Lyons etc.) with a refrigerant in it, between the output of compressor and oil storage tank 6, be provided with pressure balance magnetic valve 5 and prevent that pressure is excessive, behind oil eliminator 3 Oil-gas Separation and check valve 4, be transported to cross valve 7 and control.
If refrigeration, a valve opening cross valve 7 makes refrigerant pass through outdoor air-cooled heat exchanger 9 coolings, make a refrigerant be condensed into high-pressure sub-cooled liquid, the high pressure supercooled liquid enters into the in-tube evaporation heat absorption of crawling of outdoor oil-to-water heat exchanger 11 again through expansion valve 10 step-downs, carry out heat exchange by underground water or running water as secondary refrigerant, by water pump cold water is delivered to a plurality of indoor air-cooled heat exchangers 13 after the heat exchange, the blower fan coil of indoor air-cooled heat exchanger 13 and indoor air carry out heat exchange, carry out passing through the throttling arrangement throttling before the heat exchange, after coil in the indoor air-cooled heat exchanger carries out heat exchange with air, by air blast cold air is blowed in the air in room again.Be back in underground water or the tank through the water after the heat exchange, in the process of refrigerastion all valve-off 14 prevent that cold water from entering into hot water apparatus.Get back to compressor by becoming low-pressure steam after the refrigerant heat exchange in the coil of evaporimeter (outdoor oil-to-water heat exchanger) through cross valve 7, compressed the recycling like this process of refrigerastion of just having finished again by compressor.
If heat, heating in the process valve 14 opens, a valve opening cross valve 7 makes the refrigerant of HTHP carry out heat exchange by outdoor oil-to-water heat exchanger 11 and underground water or running water, the same with refrigeration principle by water pump 12 with delivery to indoor air-cooled heat exchanger 13, current after the heat exchange are back to outdoor oil-to-water heat exchanger 11 and carry out heat exchange, the temperature of water is raise again, the hot water that obtains exports hot water apparatus 15 to through valve 14, regulates temperature for using according to user's needs by running water.The water that outdoor oil-to-water heat exchanger 11 needs constantly to replenish is provided by underground water or running water.If it is just convenient relatively to use running water to install, installs also simple, if use underground water because of the long-term temperature of underground water remains on uniform temperature, can improve system's heating efficiency like this when cold day heats.
The power of air-conditioning output size variation is all carried out according to above-mentioned method step in the process of freezing and heating.
System's (software) control flow, as shown in Figure 4, beginning; Initialization; Read EERPOM (storage chip), system parameter setting is provided with the required temperature parameter in workspace; System carries out the temperature acquisition of workspace; System carries out communication with outside air-conditioning system; System controls and protection work; VFC is carried out in setting according to parameter; Thereby gather the temperature Adjustment System control of service environment again.Carry out the control of software in conjunction with method step of the present invention.
The above only is the preferred embodiments of the present invention; be not so limit claim of the present invention; every equivalent structure or equivalent flow process conversion that utilizes specification of the present invention and accompanying drawing content to be done; or directly or indirectly be used in other relevant technical fields, all in like manner be included in the scope of patent protection of the present invention.
Claims (10)
1. the control method of a central air-conditioning is characterized in that, may further comprise the steps:
Frequency-changeable compressor and invariable frequency compressor are arranged in parallel in central air-conditioning;
When just starting, when the air conditioner energy demand is exported energy less than invariable frequency compressor, only open frequency-changeable compressor;
In needs rising power output, when air conditioner energy demand during greater than frequency-changeable compressor output energy, allow frequency-changeable compressor run to highest frequency after, open invariable frequency compressor again.
2. control method according to claim 1 is characterized in that, also comprises step:
After opening invariable frequency compressor, when air conditioner energy need be exported energy less than invariable frequency compressor, close invariable frequency compressor.
3. control method according to claim 2 is characterized in that, described allow frequency-changeable compressor run to highest frequency after, the step of opening invariable frequency compressor again is specially:
After frequency-changeable compressor runs to highest frequency, delay time a period of time, open invariable frequency compressor again.
4. control method according to claim 3 is characterized in that, closes preceding time-delay a period of time of described invariable frequency compressor.
5. according to claim 3 or 4 described control methods, it is characterized in that, it is described when the air conditioner energy demand is exported energy greater than frequency-changeable compressor, after allowing frequency-changeable compressor run to highest frequency, open again in the step of invariable frequency compressor, open the frequency that invariable frequency compressor reduces frequency-changeable compressor simultaneously.
6. the frequency conversion central air conditioner system of combination frequently surely, comprise control system and the compressor that is connected successively, condenser, expansion valve, evaporimeter, it is characterized in that described compressor is the hybrid compressor that at least one frequency-changeable compressor and at least one invariable frequency compressor are connected by parallel way;
When just starting, when the air conditioner energy demand is exported energy less than invariable frequency compressor, only open frequency-changeable compressor;
In needs rising power output, when air conditioner energy demand during greater than frequency-changeable compressor output energy, allow frequency-changeable compressor run to highest frequency after, open invariable frequency compressor again;
After opening invariable frequency compressor, when air conditioner energy need be exported energy less than invariable frequency compressor, close invariable frequency compressor.
7. central air conditioner system according to claim 6 is characterized in that, described hybrid compressor is that a frequency-changeable compressor and a plurality of invariable frequency compressor are connected in parallel.
8. according to claim 6 or 7 described central air conditioner systems, it is characterized in that described condenser is outdoor air-cooled heat exchanger, described evaporimeter is outdoor oil-to-water heat exchanger; The output of described hybrid compressor is connected with a cross valve, and described cross valve, outdoor air-cooled heat exchanger, an expansion valve, outdoor oil-to-water heat exchanger couple together by circular pattern.
9. central air conditioner system according to claim 8, it is characterized in that, supply with described outdoor oil-to-water heat exchanger by water as cold and hot exchange media, the water that will carry out after the cold and hot exchange by a water pump is transported to indoor air-cooled heat exchanger, and the water that comes out from this indoor air-cooled heat exchanger flow to a described outdoor oil-to-water heat exchanger or a tank.
10. central air conditioner system according to claim 9 is characterized in that, described outdoor oil-to-water heat exchanger is connected with a hot water apparatus by a valve, and described hot water apparatus comprises the container of stored hot water and can carry out the running water pipe that water temperature is regulated.
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| CN 201010185261 CN101876475A (en) | 2010-05-28 | 2010-05-28 | Method and system for controlling central air-conditioning |
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| CN 201010185261 CN101876475A (en) | 2010-05-28 | 2010-05-28 | Method and system for controlling central air-conditioning |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103032996A (en) * | 2012-12-12 | 2013-04-10 | 宁波奥克斯电气有限公司 | Parallel compressor selection and configuration method for preventing compressor from being frequently started up and shut down |
| CN104074727A (en) * | 2014-06-27 | 2014-10-01 | 柳州富达机械有限公司 | Air compressor unit and control method thereof |
| CN105020853A (en) * | 2015-07-20 | 2015-11-04 | 广东美的暖通设备有限公司 | Heating start control method and system for variable-frequency air conditioner and air conditioner |
| CN107543344A (en) * | 2016-06-27 | 2018-01-05 | 浙江盾安机电科技有限公司 | The control system and control method of convertible frequency air-conditioner |
| CN109237708A (en) * | 2018-08-28 | 2019-01-18 | 青岛海尔空调电子有限公司 | Control method for air-conditioner set |
| CN112212471A (en) * | 2019-07-09 | 2021-01-12 | 青岛海尔空调电子有限公司 | Air conditioning system and compressor control method thereof |
| CN112460772A (en) * | 2020-11-30 | 2021-03-09 | 珠海格力电器股份有限公司 | Air conditioning unit multistage refrigeration method and device, computer equipment and storage medium |
| CN112984713A (en) * | 2021-03-03 | 2021-06-18 | 青岛海信电子设备股份有限公司 | Multi-compressor control method and air conditioning unit |
| CN113251713A (en) * | 2021-06-08 | 2021-08-13 | 广东申菱商用空调设备有限公司 | Capability distribution method, device and system for module unit |
| CN113739357A (en) * | 2021-08-24 | 2021-12-03 | 珠海格力电器股份有限公司 | Efficient machine room control method, device and system and central air conditioner |
| CN113883658A (en) * | 2021-10-22 | 2022-01-04 | 青岛海信日立空调系统有限公司 | Method for judging whether air conditioner is dirty or blocked, air conditioner and cloud platform |
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| CN103032996A (en) * | 2012-12-12 | 2013-04-10 | 宁波奥克斯电气有限公司 | Parallel compressor selection and configuration method for preventing compressor from being frequently started up and shut down |
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| CN105020853A (en) * | 2015-07-20 | 2015-11-04 | 广东美的暖通设备有限公司 | Heating start control method and system for variable-frequency air conditioner and air conditioner |
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| CN109237708A (en) * | 2018-08-28 | 2019-01-18 | 青岛海尔空调电子有限公司 | Control method for air-conditioner set |
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| CN112212471B (en) * | 2019-07-09 | 2022-09-16 | 青岛海尔空调电子有限公司 | Air conditioning system and compressor control method thereof |
| CN112460772A (en) * | 2020-11-30 | 2021-03-09 | 珠海格力电器股份有限公司 | Air conditioning unit multistage refrigeration method and device, computer equipment and storage medium |
| CN112460772B (en) * | 2020-11-30 | 2021-12-14 | 珠海格力电器股份有限公司 | Air conditioning unit multistage refrigeration method and device, computer equipment and storage medium |
| CN112984713A (en) * | 2021-03-03 | 2021-06-18 | 青岛海信电子设备股份有限公司 | Multi-compressor control method and air conditioning unit |
| CN113251713A (en) * | 2021-06-08 | 2021-08-13 | 广东申菱商用空调设备有限公司 | Capability distribution method, device and system for module unit |
| CN113739357A (en) * | 2021-08-24 | 2021-12-03 | 珠海格力电器股份有限公司 | Efficient machine room control method, device and system and central air conditioner |
| CN113883658A (en) * | 2021-10-22 | 2022-01-04 | 青岛海信日立空调系统有限公司 | Method for judging whether air conditioner is dirty or blocked, air conditioner and cloud platform |
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Application publication date: 20101103 |