CN110513831B - Control method for improving heating comfort during defrosting and air conditioning system - Google Patents
Control method for improving heating comfort during defrosting and air conditioning system Download PDFInfo
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- CN110513831B CN110513831B CN201910765949.3A CN201910765949A CN110513831B CN 110513831 B CN110513831 B CN 110513831B CN 201910765949 A CN201910765949 A CN 201910765949A CN 110513831 B CN110513831 B CN 110513831B
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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
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/72—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure
- F24F11/74—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity
- F24F11/77—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity by controlling the speed of ventilators
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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
- F24F11/89—Arrangement or mounting of control or safety devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H3/00—Air heaters
- F24H3/02—Air heaters with forced circulation
- F24H3/04—Air heaters with forced circulation the air being in direct contact with the heating medium, e.g. electric heating element
- F24H3/0405—Air heaters with forced circulation the air being in direct contact with the heating medium, e.g. electric heating element using electric energy supply, e.g. the heating medium being a resistive element; Heating by direct contact, i.e. with resistive elements, electrodes and fins being bonded together without additional element in-between
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/20—Arrangement or mounting of control or safety devices
- F24H9/2064—Arrangement or mounting of control or safety devices for air heaters
- F24H9/2071—Arrangement or mounting of control or safety devices for air heaters using electrical energy supply
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Fluid Mechanics (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention provides a control method for improving heating comfort during defrosting, which is used for an air conditioner, wherein the air conditioner comprises an indoor fan, an indoor heat exchanger and an electric auxiliary heating device, and the control method comprises the following steps: acquiring the pipeline temperature T _ in and the indoor environment temperature T _ ao of the heat exchanger in real time from the time when the air conditioner enters a defrosting operation mode; obtaining an indoor dew point temperature T _ d according to the indoor environment temperature T _ ao or the humidity; and controlling the operation modes of the indoor fan and the electric auxiliary heating device according to the size relationship between the pipeline temperature T _ in and the environmental temperature T _ ao as well as the dew point temperature T _ d. According to the invention, the rotation speed of the fan of the indoor unit is adjusted and the operation mode of the electric auxiliary heating device is controlled by judging the temperature of the coil pipe of the indoor unit, so that on one hand, the temperature of the heat exchanger of the indoor unit is not too low when the defrosting operation is carried out, and the heating air-out time is increased; on the other hand, the air outlet temperature of the indoor unit is quickly increased after defrosting is finished, so that the heating effect is improved, and the use comfort of a user is ensured.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to a control method for improving heating comfort during defrosting and an air conditioning system.
Background
When the air conditioner heats at low temperature, the coil pipe of the condenser often generates a frosting phenomenon, and the heating effect of the air conditioner is worse and worse along with the thicker and thicker frost layer, and at the moment, the air conditioner needs to enter a defrosting mode to operate and defrost.
In the prior art, during defrosting operation of the air conditioner, the indoor unit usually stops operating and stops heating, and after defrosting is finished, the indoor unit enters heating operation again. And during the stop operation of the indoor unit, the temperature of the heat exchanger of the indoor unit is reduced, after defrosting is finished, the indoor unit can be operated again only after the temperature of the heat exchanger of the indoor unit is increased again, and electric auxiliary heating is started after the indoor fan is started. Therefore, on one hand, no hot air is blown out from the indoor unit during defrosting, on the other hand, the air outlet temperature is lower in a period after starting after defrosting is finished, the waiting time of the whole process is longer, the heating efficiency is low, the heating effect is poor, and the comfort of users is influenced.
Disclosure of Invention
The invention solves the problems of slow heating air-out temperature rise and poor heating comfort caused by defrosting operation of the air conditioner in the prior art.
In order to solve the above problems, a first aspect of the present invention provides a control method for improving heating comfort during defrosting, which is used for an air conditioner, where the air conditioner includes an indoor fan, an indoor heat exchanger, and an electric auxiliary heating device, and the control method includes:
acquiring the pipeline temperature T _ in and the indoor environment temperature T _ ao of the heat exchanger in real time from the time when the air conditioner enters a defrosting operation mode, and acquiring the indoor dew point temperature T _ d according to the indoor environment temperature T _ ao or humidity;
and controlling the operation modes of the indoor fan and the electric auxiliary heating device according to the size relationship between the pipeline temperature T _ in and the environmental temperature T _ ao as well as the dew point temperature T _ d.
According to the invention, the rotation speed of the fan of the indoor unit is adjusted and the operation mode of the electric auxiliary heating device is controlled by judging the temperature of the coil pipe of the indoor unit, so that on one hand, the temperature of the heat exchanger of the indoor unit is not too low when the defrosting operation is carried out, and the heating air-out time is increased; on the other hand, the air outlet temperature of the indoor unit is quickly increased after defrosting is finished, so that the heating effect is improved, and the use comfort of a user is ensured.
Further, during defrosting operation of the air conditioner, if T _ in is greater than T _ ao, the indoor fan is controlled to maintain a user set state, and the electric auxiliary heating device is controlled to be started;
if T _ d is more than T _ in and less than or equal to T _ ao, controlling the indoor fan to enter a low-wind-gear operation mode, and controlling the electric auxiliary heating device to enter a low-heat mode;
and if the T _ in is less than or equal to the T _ d, controlling the indoor fan to stop running and closing the electric auxiliary heating device.
Further, after defrosting of the air conditioner is completed and the air conditioner enters a heating mode, if T _ d is more than T _ in and less than or equal to T _ ao, the indoor fan is controlled to enter a low-wind-gear operation mode, and the electric auxiliary heating device is controlled to enter a low-heat mode;
and if T _ in is larger than T _ ao, controlling the indoor fan to enter a user set state or a state before defrosting operation, and starting the electric auxiliary heating device to enter a normal judgment mode.
Further, the low-heat mode of the electric auxiliary heating device is that the electric auxiliary heating device is intermittently started.
Further, the low-heat mode of the electric auxiliary heating device is to reduce the input power of the electric auxiliary heating device.
Further, the time interval for acquiring the pipeline temperature T _ in and the indoor environment temperature T _ ao of the heat exchanger in real time is 3-10 s.
In a second aspect of the present invention, there is provided an air conditioner control system, which employs the above control method, and includes: the acquisition module is used for acquiring the pipeline temperature and the indoor environment temperature of the heat exchanger in real time after the air conditioner enters a defrosting operation mode; the calculation module is used for calculating the indoor dew point temperature according to the indoor environment temperature or humidity; the judging module is used for comparing the pipeline temperature with the environment temperature and the dew point temperature; and the control module is used for controlling the operation modes of the indoor fan and the electric auxiliary heating device according to the comparison result.
The invention provides an air conditioner, which comprises an indoor fan, an indoor heat exchanger and an electric auxiliary heating device and is characterized by comprising the air conditioner control system, wherein the electric auxiliary heating device is arranged between the indoor fan and the indoor heat exchanger or arranged on one side of the indoor heat exchanger, which is far away from the indoor fan.
Further, the air conditioner comprises an outdoor unit, and the outdoor unit comprises a compressor, a four-way reversing valve and an outdoor heat exchanger.
The invention has the beneficial effects that: according to the invention, the rotation speed of the fan of the indoor unit is adjusted and the operation mode of the electric auxiliary heating device is controlled by judging the temperature of the coil pipe of the indoor unit, so that on one hand, the temperature of the heat exchanger of the indoor unit is not too low when the defrosting operation is carried out, and the heating air-out time is increased; on the other hand, the air outlet temperature of the indoor unit is quickly increased after defrosting is finished, so that the heating effect is improved, and the use comfort of a user is ensured. The invention can prevent abnormal sound and potential safety hazard caused by condensation generated by the heat exchanger of the indoor unit by combining the judgment condition of the dew point temperature.
Drawings
FIG. 1 is a control flow chart of a control method of the present invention;
FIG. 2 is a system diagram of the control system of the present invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
The invention provides a control method of an air conditioner, and fig. 1 is a control flow chart of the control method for improving heating comfort during defrosting, which is used for the air conditioner, wherein the air conditioner comprises an indoor fan, an indoor heat exchanger and an electric auxiliary heating device, and the method comprises the following steps:
when the air conditioner meets defrosting conditions, the air conditioner enters a defrosting operation mode, and at the moment, the pipeline temperature T _ in and the indoor environment temperature T _ ao of the heat exchanger begin to be acquired in real time; preferably, the time interval for acquiring the pipeline temperature T _ in of the heat exchanger and the indoor environment temperature T _ ao in real time is 3-10s, and further preferably 5 s. In addition, an indoor dew point temperature T _ d is obtained according to the indoor environment temperature T _ ao or humidity, and can be calculated according to a Marglas empirical formula or a dew point humidity, and the indoor dew point temperature T _ d is always smaller than the indoor environment temperature T _ ao in a general case.
The invention controls the operation modes of the indoor fan and the electric auxiliary heating device according to the change of the pipeline temperature T _ in, particularly the control mode is as follows,
during defrosting operation of the air conditioner:
if T _ in is larger than T _ ao, controlling the indoor fan to maintain a user set state (namely, a state before defrosting operation is kept), controlling the electric auxiliary heating device to be started, and if the current electric auxiliary heating device is started, keeping the current electric auxiliary heating device to be started; the pipeline temperature T _ in is generally higher than the indoor environment temperature T _ ao at the moment of entering defrosting operation before the defrosting operation, the pipeline temperature T _ in is continuously reduced due to the operation refrigeration mode of the air conditioner unit in the defrosting operation process, and the indoor fan still can achieve the heating effect when the T _ in is larger than the T _ ao, so that the indoor fan is controlled to maintain the user set state at the moment, the electric auxiliary heating device is controlled to be started, the heating air-out time can be prolonged, and the indoor continuous heating can be ensured;
if T _ d is more than T _ in and less than or equal to T _ ao, controlling the indoor fan to enter a low-wind-gear operation mode (if the current low-wind-gear operation mode is adopted, the current state is kept), and controlling the electric auxiliary heating device to enter a low-heat mode; the low-heat mode of the electric auxiliary heat device comprises that the electric auxiliary heat device is intermittently started or the input power of the electric auxiliary heat device is reduced, preferably, the time interval of the intermittent starting of the electric auxiliary heat device is 30s for starting and 10s for closing, and if the electric auxiliary heat device is an adjustable power device, 50% load input power of the electric auxiliary heat device can be directly reduced, so that the low-heat mode of the electric auxiliary heat device is realized; the reason is that on one hand, in order to prevent the temperature T _ in of the pipeline from continuously decreasing, the electric auxiliary heating device needs to be continuously started, and on the other hand, the electric auxiliary heating device enters a low-heat mode to prevent the local temperature from being overhigh, so that the injection molding part of the air conditioner is prevented from being burnt;
if T _ in is less than or equal to T _ d, the temperature of the pipeline of the indoor heat exchanger is reduced to be lower than the dew point temperature, at the moment, the indoor fan is controlled to stop running, and the electric auxiliary heating device is closed; this is because when T _ in is less than the dew point temperature T _ d, condensation may be formed by water in the air, and condensation may be generated on the surface of the heat exchanger, so as to prevent the condensation from occurring on the heat exchanger and being blown to the electric auxiliary heating device by the blower or blown out from the air outlet, which causes abnormal sound and potential safety hazard and affects the comfort level of the user, and therefore, the indoor blower and the electric auxiliary heating device need to be turned off at this time.
After the air conditioner finishes defrosting and enters a heating mode:
if T _ d is more than T _ in and less than or equal to T _ ao, controlling the indoor fan to enter a low-wind-gear operation mode, and controlling the electric auxiliary heating device to enter a low-heat mode; the reason is that after defrosting is finished and the heating mode is entered, the temperature T _ in of the pipeline is gradually increased, when T _ in is larger than T _ d, the indoor fan operates in a low wind gear mode, the electric auxiliary heating device operates in a low heat mode, and the air outlet temperature can be further increased;
if T _ in is larger than T _ ao, the pipeline temperature is larger than the indoor environment temperature, the control of detecting the pipeline temperature T _ in and the indoor environment temperature T _ ao is quitted, a conventional heating mode is recovered, the indoor fan is controlled to enter a user set state or a state before defrosting operation, the electric auxiliary heating device is started to enter a conventional judgment mode, and the conventional judgment mode refers to judgment of whether the electric auxiliary heating device is started or not in the conventional heating mode of the air conditioner.
The control method disclosed by the invention discloses a specific operation standard, and has strong operability and good universality; the control method of the invention realizes that the indoor fan and the electric auxiliary heating device are closed in a delayed way after the air conditioner enters the defrosting operation, increases the heating air-out time, avoids the heat shock caused by the defrosting and refrigerating operation, and in addition, the indoor fan and the electric auxiliary heating device are opened in advance after the air conditioner exits the defrosting operation, improves the air-out temperature, and reduces the heating waiting time of users, thereby integrally improving the heating effect of the air conditioner and ensuring the comfort of the users.
The invention also provides an air conditioner defrosting control system, which comprises: the acquisition module is used for acquiring the pipeline temperature T _ in and the indoor environment temperature T _ ao of the heat exchanger in real time after the air conditioner enters a defrosting operation mode; the calculation module is used for calculating the indoor dew point temperature T _ d according to the indoor environment temperature T _ ao or the humidity; the judging module is used for comparing the pipeline temperature T _ in with the environment temperature T _ ao and the dew point temperature T _ d; and the control module is used for controlling the operation modes of the indoor fan and the electric auxiliary heating device according to the comparison result.
As shown in fig. 2, the present invention further provides an air conditioner, the air conditioner includes an outdoor unit 1 and one or more indoor units 2, the indoor unit 2 includes an indoor fan 2-1, an indoor heat exchanger 2-2, and an electric auxiliary heating device 2-3, the electric auxiliary heating device 2-3 is disposed between the indoor fan 2-1 and the indoor heat exchanger 2-2, and is preferably disposed on a side of the indoor heat exchanger 2-2 away from the indoor fan 2-1. The indoor heat exchanger 2-2 is provided with a sensor 2-4 for detecting the temperature of the pipeline, and the indoor unit 2 is also provided with a sensor 2-5 for detecting the ambient temperature. The outdoor unit comprises a compressor 1-1, a four-way reversing valve 1-2 and an outdoor heat exchanger 1-3.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (8)
1. A control method for improving heating comfort during defrosting is used for an air conditioner, wherein the air conditioner comprises an indoor fan, an indoor heat exchanger and an electric auxiliary heating device, and is characterized in that the control method comprises the following steps: acquiring the pipeline temperature T _ in and the indoor environment temperature T _ ao of the heat exchanger in real time from the time when the air conditioner enters a defrosting operation mode, and acquiring the indoor dew point temperature T _ d according to the indoor environment temperature T _ ao or humidity;
controlling the operation modes of the indoor fan and the electric auxiliary heating device according to the size relationship among the pipeline temperature T _ in, the environment temperature T _ ao and the dew point temperature T _ d;
during defrosting operation of the air conditioner, if T _ in is larger than T _ ao, controlling the indoor fan to maintain a user set state, and controlling the electric auxiliary heating device to be started;
if T _ d is more than T _ in and less than or equal to T _ ao, controlling the indoor fan to enter a low-wind-gear operation mode, and controlling the electric auxiliary heating device to enter a low-heat mode;
and if the T _ in is less than or equal to the T _ d, controlling the indoor fan to stop running and closing the electric auxiliary heating device.
2. The control method according to claim 1, wherein after defrosting of the air conditioner is completed and the heating mode is entered, if T _ d is less than T _ in and less than T _ ao, the indoor fan is controlled to enter a low wind shift operation mode, and the electric auxiliary heating device is controlled to enter a low heating mode;
and if T _ in is larger than T _ ao, controlling the indoor fan to enter a user set state or a state before defrosting operation, and starting the electric auxiliary heating device to enter a normal judgment mode.
3. The control method according to claim 1 or 2, wherein the low-heat mode of the electric auxiliary heating apparatus is an intermittent turn-on of the electric auxiliary heating apparatus.
4. The control method according to claim 1 or 2, characterized in that the low-heat mode of the electric auxiliary heating device is to reduce the input power of the electric auxiliary heating device.
5. The control method according to claim 1, wherein the time interval for acquiring the pipe temperature T _ in and the indoor ambient temperature T _ ao of the heat exchanger in real time is 3-10 s.
6. An air conditioning control system characterized by adopting the control method according to any one of claims 1 to 5, the system comprising: the acquisition module is used for acquiring the pipeline temperature and the indoor environment temperature of the heat exchanger in real time after the air conditioner enters a defrosting operation mode; the calculation module is used for calculating the indoor dew point temperature according to the indoor environment temperature or humidity; the judging module is used for comparing the pipeline temperature with the environment temperature and the dew point temperature; the control module is used for controlling the operation modes of the indoor fan and the electric auxiliary heating device according to the comparison result;
the control module is further used for controlling the indoor fan to maintain a user set state and controlling the electric auxiliary heating device to be started if T _ in is larger than T _ ao in the defrosting operation period of the air conditioner; if T _ d is more than T _ in and less than or equal to T _ ao, controlling the indoor fan to enter a low-wind-gear operation mode, and controlling the electric auxiliary heating device to enter a low-heat mode; and if the T _ in is less than or equal to the T _ d, controlling the indoor fan to stop running and closing the electric auxiliary heating device.
7. An air conditioner, the air conditioner includes the indoor fan, the indoor heat exchanger, the electric auxiliary heating device, characterized by, including the air conditioner control system of claim 6, the electric auxiliary heating device is set up between the indoor fan and the indoor heat exchanger, or set up in the indoor heat exchanger and keep away from the side of the indoor fan.
8. The air conditioner of claim 7, wherein the air conditioner comprises an outdoor unit comprising a compressor, a four-way reversing valve, and an outdoor heat exchanger.
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| CN113970165B (en) * | 2020-07-24 | 2022-11-04 | 广东美的制冷设备有限公司 | Air conditioner, radiation control method and device thereof, and computer readable storage medium |
| CN112944594B (en) * | 2021-01-29 | 2023-04-14 | 青岛海尔空调器有限总公司 | Method and device for defrosting control of air conditioner and air conditioner |
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| CN108731205A (en) * | 2018-06-13 | 2018-11-02 | 广东美的制冷设备有限公司 | Progress control method, device, air conditioner and computer readable storage medium |
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| JP2001041533A (en) * | 1999-07-30 | 2001-02-16 | Hitachi Ltd | Air conditioner |
| JP2012117775A (en) * | 2010-12-02 | 2012-06-21 | Mitsubishi Electric Corp | Load side device of freezer/refrigerator |
| CN106524445B (en) * | 2017-01-10 | 2019-03-22 | 美的集团武汉制冷设备有限公司 | A kind of control method of air conditioner, system and air conditioner |
| CN106766007B (en) * | 2017-02-21 | 2020-02-21 | 青岛海尔空调器有限总公司 | Air conditioner and method for improving comfort degree of air conditioner in defrosting process |
| CN108679824A (en) * | 2018-07-23 | 2018-10-19 | 奥克斯空调股份有限公司 | Condensation prevention control method and air conditioner |
| CN109140666A (en) * | 2018-09-03 | 2019-01-04 | 珠海格力电器股份有限公司 | Machine self cleaning method inside and outside a kind of air-conditioning |
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| CN108731205A (en) * | 2018-06-13 | 2018-11-02 | 广东美的制冷设备有限公司 | Progress control method, device, air conditioner and computer readable storage medium |
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