CN111219858B - Multistage electric auxiliary heating water multi-connected air conditioner cold air prevention control method and system and air conditioner - Google Patents
Multistage electric auxiliary heating water multi-connected air conditioner cold air prevention control method and system and air conditioner Download PDFInfo
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- CN111219858B CN111219858B CN202010012038.6A CN202010012038A CN111219858B CN 111219858 B CN111219858 B CN 111219858B CN 202010012038 A CN202010012038 A CN 202010012038A CN 111219858 B CN111219858 B CN 111219858B
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- 230000002265 prevention Effects 0.000 title claims abstract description 43
- 238000000034 method Methods 0.000 title claims abstract description 38
- 239000008236 heating water Substances 0.000 title claims abstract description 17
- 238000010438 heat treatment Methods 0.000 claims abstract description 73
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 33
- 230000007613 environmental effect Effects 0.000 claims description 7
- 238000012544 monitoring process Methods 0.000 claims description 4
- 238000005057 refrigeration Methods 0.000 claims description 4
- 238000007664 blowing Methods 0.000 abstract description 8
- 238000004378 air conditioning Methods 0.000 description 9
- 230000008878 coupling Effects 0.000 description 4
- 238000010168 coupling process Methods 0.000 description 4
- 238000005859 coupling reaction Methods 0.000 description 4
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 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
- F24F11/65—Electronic processing for selecting an operating mode
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2140/00—Control inputs relating to system states
- F24F2140/20—Heat-exchange fluid temperature
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2221/00—Details or features not otherwise provided for
- F24F2221/34—Heater, e.g. gas burner, electric air heater
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- Air Conditioning Control Device (AREA)
Abstract
The invention relates to a multi-stage electric auxiliary heating water multi-connected air conditioner cold air prevention control method, which controls electric auxiliary heating to realize cold air-free operation adjustment of heating startup by detecting the pipe temperature and the ambient temperature of an indoor unit of an air conditioner and entering a cold air prevention operation mode according to the pipe temperature and the ambient temperature of the indoor unit of the air conditioner. The control method for preventing cold wind of the multistage electric-assisted water multi-connected air conditioner can realize cold wind-free operation regulation during heating startup, has better heating comfort, thoroughly solves the problem of cold wind blowing under the heating working condition, and also provides a system for preventing cold wind of the multistage electric-assisted water multi-connected air conditioner, which is used for realizing the control method for preventing cold wind of the multistage electric-assisted water multi-connected air conditioner; and an air conditioner having the multistage electrically-assisted hot water multi-connected air conditioner cold air prevention system is provided.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to a control method for preventing cold wind of a multi-stage electric auxiliary heating water multi-connected air conditioner; the system is used for realizing the control method of preventing cold wind of the multi-stage electric auxiliary heating water multi-connected air conditioner; and an air conditioner having the multistage electrically-assisted hot water multi-connected air conditioner cold air prevention system is provided.
Background
The function of traditional air conditioner family formula water machine is ageing relatively, and interior outer quick-witted can not link, just carries out refrigeration or heating through providing a fixed temperature, and the travelling comfort is relatively poor, and the bad habit of using causes the emergence of above-mentioned condition more easily especially. The water multi-connected air conditioner has the advantages that the water multi-connected air conditioner can realize the water machine with linkage of the internal machine and the external machine according to the air conditioning requirement of indoor rooms of users, has stronger product competitiveness than the traditional air conditioner household water machine which cannot be linked, has comfortable air conditioning capacity which can be compared with the fluorine multi-connected air conditioner, is more and more favored, and has high matching ratio, comfortable floor heating and the like.
The existing water multi-connected central air conditioner is more in service condition by installing a water multi-connected carrying air disc, mainly comprises an external unit, a cold and hot water generator, a terminal device and a water pipeline system, and is additionally provided with a host and a sub-disc for control communication when carrying a fan coil, so that an upgrading system of the traditional household central air conditioner is formed. The control idea of the main body refrigerating and heating process of the water multi-connected central air conditioner is as follows: the running water temperature required to be provided is calculated according to the target room temperature set by the room air plate, and the running water temperature is periodically adjusted up and down according to the room temperature difference between the room temperature and the target room temperature, so that the accurate temperature control effect after the stable stage is achieved, and the comfort is guaranteed. However, the cold wind prevention operation detection exists in the process of the unit which is just started and restarted after the unit is stopped at a temperature point, and the traditional cold wind prevention operation is generally controlled whether to enter or exit the cold wind prevention operation or not by simply detecting whether the temperature value of the pipe reaches a certain set temperature value or not. However, in practical use, the control method causes problems of untimely startup and long waiting time of users.
The patent No. CN106839318A discloses a method and a controller for controlling a floor air conditioner to prevent cold wind, and a floor air conditioner for controlling the blowing condition of cold wind by controlling the angle of an indoor unit air deflector. Patent number CN107355952A discloses a method and device for controlling cold air prevention of an air conditioner, and the method and device for controlling cold air prevention of an air conditioner by acquiring the temperature of indoor environment and the temperature of an indoor coil; determining cold-proof air temperature according to indoor environment temperature; and when the temperature of the indoor coil pipe is greater than or equal to the cold-proof air temperature, controlling the indoor fan to start air supply. These patents improve the problem of blowing cold air by controlling the air supply angle and the air supply temperature, but these control methods still cannot fundamentally solve the problem of waiting for the user at the initial startup stage.
Disclosure of Invention
The invention aims to overcome the problems of the prior art and provides a control method for preventing cold wind of a multi-stage electric-assisted water multi-connected air conditioner, the control method can realize the cold wind-free operation regulation during the heating starting, has better heating comfort and thoroughly solves the problem of cold wind blowing under the heating working condition, and the invention also provides a multi-stage electric-assisted water multi-connected air conditioner cold wind prevention system for realizing the control method for preventing cold wind of the multi-stage electric-assisted water multi-connected air conditioner; and an air conditioner having the multistage electrically-assisted hot water multi-connected air conditioner cold air prevention system is provided.
In order to achieve the purpose, the invention adopts the following scheme:
the control method of the multistage electric auxiliary heating water multi-connected air conditioner cold air prevention comprises the steps of detecting the pipe temperature and the ambient temperature of an indoor unit of an air conditioner, entering a cold air prevention operation mode according to the pipe temperature and the ambient temperature of the indoor unit of the air conditioner, and controlling electric auxiliary heating to achieve cold air-free operation adjustment of heating starting.
Further, the specific steps of controlling the electric auxiliary heating to realize the heating start-up cold-wind-free operation regulation by detecting the pipe temperature and the ambient temperature of the air-conditioning indoor unit and entering the cold-wind-proof operation mode according to the pipe temperature and the ambient temperature of the air-conditioning indoor unit are as follows:
s1, detecting whether a heating requirement exists or not;
s2, if yes, detecting the pipe temperature of the indoor unit of the air conditioner, and recording the pipe temperature as a pipe temperature value K;
s3, operating according to a windshield set by a user;
s4, monitoring the environmental temperature;
s5, judging whether the environmental temperature is greater than 5 ℃;
s6, if yes, entering a primary cold air prevention operation mode, and controlling electric auxiliary heating to realize cold air-free operation adjustment of heating startup;
and S7, if not, entering an advanced cold air prevention operation mode, and controlling electric auxiliary heating to realize cold air-free operation adjustment of heating starting.
Further, the specific steps of entering the primary cold air prevention operation mode and controlling the electric auxiliary heating to realize the cold air-free operation adjustment during the heating startup are as follows:
s61, when the temperature value K of the pipe meets 35 ℃ and is higher than K; the electric auxiliary heat is turned off;
s62, when the temperature value K of the pipe meets the condition that K is more than or equal to 20 ℃ at the temperature of 35 ℃; the electric auxiliary heat is started at the first stage, and the pipe temperature of the indoor unit of the air conditioner is detected back until the electric auxiliary heat is closed;
s63, when the temperature K of the pipe meets the condition that K is less than or equal to 20 ℃; and (4) turning on the second stage by the electric auxiliary heat, and returning to detect the pipe temperature of the indoor unit of the air conditioner until the electric auxiliary heat is turned off.
Further, the specific steps of entering the advanced cold air prevention operation mode and controlling the electric auxiliary heating to realize the heating startup cold air-free operation regulation are as follows:
s71, when the temperature value K of the pipe meets 35 ℃ and is higher than K; the electric auxiliary heat is turned off;
s72, when the temperature value K of the pipe meets the condition that K is more than or equal to 20 ℃ at the temperature of 35 ℃; the electric auxiliary heat is started at the second stage, and the pipe temperature of the indoor unit of the air conditioner is detected back until the electric auxiliary heat is closed;
s73, when the temperature K of the pipe meets the condition that K is less than or equal to 20 ℃; and the electric auxiliary heat is started for three stages, and the pipe temperature of the indoor unit of the air conditioner is returned to be detected until the electric auxiliary heat is closed.
Further, after the step of S2, the control method further includes:
and S21, if not, the unit continuously performs standby or refrigeration operation.
Furthermore, the pipe temperature of the indoor unit of the air conditioner is the average value of the temperatures of the upper part, the middle part and the lower part of the heat exchange pipe of the air disc.
Further, the pipe temperature of the air-conditioning indoor unit is detected by a temperature sensor.
Further, the electric auxiliary heat can be opened at least two stages, and the higher the opening stage number is, the larger the heating power is.
The invention also provides a multistage electric auxiliary heating cold air prevention system for the water multi-connected air conditioner, which is used for realizing the multistage electric auxiliary heating cold air prevention control method for the water multi-connected air conditioner.
And the air conditioner comprises the multistage electric auxiliary heating water multi-connected air conditioner cold air prevention system.
Compared with the prior art, the invention has the following advantages:
according to the multi-stage electric auxiliary heating water multi-connected air conditioner cold air prevention control method, whether different environment temperatures and pipe temperatures of the indoor units of the air conditioners reach preset pipe temperature values corresponding to different electric auxiliary heating levels or not is monitored according to the environment temperatures and the pipe temperatures of the indoor units of the air conditioners, a cold air prevention operation mode is entered, the electric auxiliary heating starting level is controlled, multi-condition coupling control is achieved, cold air-free operation adjustment of heating starting is achieved, heating comfort is better, and the problem of cold air blowing under the heating working condition is thoroughly solved.
Drawings
The present application will be described in further detail with reference to the following drawings and detailed description.
Fig. 1 is a control flow chart of a control method for preventing cold wind of a multi-stage electric auxiliary heating water multi-connected air conditioner of the invention.
Detailed Description
The present application is further described in conjunction with the following examples.
Example 1:
the invention also provides a multistage electric auxiliary heating cold air prevention system for the water multi-connected air conditioner, which is used for realizing the multistage electric auxiliary heating cold air prevention control method for the water multi-connected air conditioner. The multi-stage electric auxiliary heating water multi-connected air conditioner cold air preventing system comprises electric auxiliary heating, an air conditioner indoor unit, a temperature sensor, a compressor, an air conditioner outdoor unit and a throttling device. The electric auxiliary heat can be opened at least two stages, and the higher the opening stage number is, the higher the heating power is. The number of the electric auxiliary heat stages is not limited, two stages, three stages, four stages, five stages and the like can be started, and in the invention, the electric auxiliary heat can be started at three stages. The air conditioner indoor unit comprises an air disc heat exchange pipe. The temperature sensors are arranged on the upper part, the middle part and the lower part of the air disc heat exchange tube and used for detecting the tube temperature of the indoor unit of the air conditioner and the ambient temperature. This multistage electric-assisted hot water allies oneself with air conditioner prevents cold wind's system can be according to the pipe temperature of ambient temperature and air conditioning indoor set, and whether the pipe temperature of monitoring different ambient temperatures and air conditioning indoor set reaches the electric heat level of assisting that preset pipe temperature value corresponds different, gets into cold wind operation mode of preventing, and the control electricity is assisted hot and is opened the grade, realizes the multi-condition coupling control, realizes heating the start and does not have cold wind operation regulation, and it is better to heat the travelling comfort, thoroughly solves the cold wind problem of blowing under the heating operating mode.
Example 2:
referring to fig. 1, the method for controlling the multi-stage electric-assisted hot water multi-connected air conditioner to prevent cold wind is implemented by using the multi-stage electric-assisted hot water multi-connected air conditioner cold wind prevention system, and the method controls the electric-assisted hot water to realize the heating startup cold wind-free operation regulation by detecting the pipe temperature and the ambient temperature of the indoor unit of the air conditioner and entering a cold wind prevention operation mode according to the pipe temperature and the ambient temperature of the indoor unit of the air conditioner.
According to the control method for preventing cold wind of the multi-stage electric auxiliary heating water multi-connected air conditioner, whether different environment temperatures and pipe temperatures of the indoor unit of the air conditioner reach preset pipe temperature values corresponding to different electric auxiliary heating levels or not is monitored according to the environment temperatures and the pipe temperatures of the indoor unit of the air conditioner, a cold wind prevention operation mode is entered, the electric auxiliary heating starting level is controlled, multi-condition coupling control is achieved, cold wind-free operation adjustment of a heating starting machine is achieved, heating comfort is better, and the problem of cold wind blowing under a heating working condition is thoroughly solved.
Specifically, the specific steps of controlling the electric auxiliary heating to realize heating starting and cold-air-free operation regulation by detecting the pipe temperature and the ambient temperature of the air-conditioning indoor unit and entering the cold-air-proof operation mode according to the pipe temperature and the ambient temperature of the air-conditioning indoor unit are as follows:
s1, detecting whether a heating demand exists.
S2, if yes, detecting the pipe temperature of the indoor unit of the air conditioner, and recording the pipe temperature as a pipe temperature value K; the pipe temperature of the indoor unit of the air conditioner is detected through a temperature sensor. The pipe temperature of the indoor unit of the air conditioner is the average value of the temperatures of the upper part, the middle part and the lower part of the heat exchange pipe of the air disc.
And S21, if not, the unit continuously performs standby or refrigeration operation.
And S3, operating according to the windshield set by the user.
And S4, monitoring the ambient temperature through an ambient temperature sensor.
S5, judging whether the environmental temperature is higher than 5 ℃.
S6, if the temperature is higher than 5 ℃, entering a primary cold air prevention operation mode, and controlling electric auxiliary heating to realize cold air-free operation adjustment of heating startup; the method comprises the following specific steps:
s61, when the temperature value K of the pipe meets 35 ℃ and is higher than K; the electric assist heat is turned off.
S62, when the temperature value K of the pipe meets the condition that K is more than or equal to 20 ℃ at the temperature of 35 ℃; and (4) starting the first stage of the electric auxiliary heat, and returning to detect the pipe temperature of the indoor unit of the air conditioner until the electric auxiliary heat is closed.
S63, when the temperature K of the pipe meets the condition that K is less than or equal to 20 ℃; and (4) turning on the second stage by the electric auxiliary heat, and returning to detect the pipe temperature of the indoor unit of the air conditioner until the electric auxiliary heat is turned off.
And S7, if not, namely the ambient temperature is less than or equal to 5 ℃, entering a high-grade cold wind prevention operation mode, and controlling electric auxiliary heating to realize cold wind-free operation adjustment of heating startup. The method comprises the following specific steps:
s71, when the temperature value K of the pipe meets 35 ℃ and is higher than K; the electric auxiliary heat is turned off;
s72, when the temperature value K of the pipe meets the condition that K is more than or equal to 20 ℃ at the temperature of 35 ℃; the electric auxiliary heat is started at the second stage, and the pipe temperature of the indoor unit of the air conditioner is detected back until the electric auxiliary heat is closed;
s73, when the temperature K of the pipe meets the condition that K is less than or equal to 20 ℃; and the electric auxiliary heat is started for three stages, and the pipe temperature of the indoor unit of the air conditioner is returned to be detected until the electric auxiliary heat is closed.
Therefore, the control method for preventing cold wind of the multi-stage electric auxiliary heating water multi-connected air conditioner monitors whether different environmental temperatures and pipe temperatures of the indoor air conditioner units reach different electric auxiliary heating levels corresponding to preset pipe temperature values or not according to the environmental temperatures and the pipe temperatures of the indoor air conditioner units, enters a cold wind prevention operation mode, controls the electric auxiliary heating starting levels, realizes multi-condition coupling control, realizes no cold wind operation adjustment during heating starting, has better heating comfort, and thoroughly solves the problem of cold wind blowing under the heating working condition.
Example 3
The invention also provides an air conditioner which comprises the multistage electric auxiliary heating water multi-connected air conditioner cold air prevention system. The air conditioner is provided with the multi-stage electric auxiliary heating water multi-connected air conditioner cold air prevention system, so that cold air-free operation adjustment during heating starting can be realized during starting of the air conditioner, the heating comfort is better, and the overall reliability of the air conditioner is improved.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the protection scope of the present application, and although the present application is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present application without departing from the spirit and scope of the technical solutions of the present application.
Claims (8)
1. The control method for preventing cold wind of the multi-stage electric auxiliary heating water multi-connected air conditioner is characterized in that the control method controls electric auxiliary heating to realize cold wind-free operation adjustment of a heating start-up machine by detecting the pipe temperature and the ambient temperature of an indoor unit of the air conditioner and entering a cold wind prevention operation mode according to the pipe temperature and the ambient temperature of the indoor unit of the air conditioner; the method comprises the following specific steps of detecting the pipe temperature and the ambient temperature of the indoor unit of the air conditioner, entering a cold air prevention operation mode according to the pipe temperature and the ambient temperature of the indoor unit of the air conditioner, and controlling electric auxiliary heating to realize heating starting and cold air-free operation regulation:
s1, detecting whether a heating requirement exists or not;
s2, if yes, detecting the pipe temperature of the indoor unit of the air conditioner, and recording the pipe temperature as a pipe temperature value K;
s3, operating according to a windshield set by a user;
s4, monitoring the environmental temperature;
s5, judging whether the environmental temperature is greater than 5 ℃;
s6, if yes, entering a primary cold air prevention operation mode, and controlling electric auxiliary heating to realize cold air-free operation adjustment of heating startup;
s7, if not, entering an advanced cold air prevention operation mode, and controlling electric auxiliary heating to realize cold air-free operation adjustment of the heating startup;
the specific steps of entering the primary cold air prevention operation mode and controlling the electric auxiliary heating to realize the heating startup cold air-free operation regulation are as follows:
s61, when the temperature value K of the pipe meets 35 ℃ and is higher than K; the electric auxiliary heat is turned off;
s62, when the temperature value K of the pipe meets the condition that K is more than or equal to 20 ℃ at the temperature of 35 ℃; the electric auxiliary heat is started at the first stage, and the pipe temperature of the indoor unit of the air conditioner is detected back until the electric auxiliary heat is closed;
s63, when the temperature K of the pipe meets the condition that K is less than or equal to 20 ℃; and (4) turning on the second stage by the electric auxiliary heat, and returning to detect the pipe temperature of the indoor unit of the air conditioner until the electric auxiliary heat is turned off.
2. The method for controlling the multi-stage electric auxiliary heating water multi-connected air conditioner to prevent cold wind according to claim 1, wherein the specific steps of entering the advanced cold wind prevention operation mode and controlling the electric auxiliary heating to realize heating startup cold wind-free operation regulation are as follows:
s71, when the temperature value K of the pipe meets 35 ℃ and is higher than K; the electric auxiliary heat is turned off;
s72, when the temperature value K of the pipe meets the condition that K is more than or equal to 20 ℃ at the temperature of 35 ℃; the electric auxiliary heat is started at the second stage, and the pipe temperature of the indoor unit of the air conditioner is detected back until the electric auxiliary heat is closed;
s73, when the temperature K of the pipe meets the condition that K is less than or equal to 20 ℃; and the electric auxiliary heat is started for three stages, and the pipe temperature of the indoor unit of the air conditioner is returned to be detected until the electric auxiliary heat is closed.
3. The multi-stage electric-assisted hot water multi-connected air conditioner cold air prevention control method as claimed in claim 1, wherein after the step of S2, the control method further comprises:
and S21, if not, the unit continuously performs standby or refrigeration operation.
4. The method as claimed in claim 1, wherein the temperature of the air conditioner indoor unit is an average of the temperatures of the upper, middle and lower portions of the air coil heat exchange tube.
5. The method as claimed in claim 1, wherein the temperature of the indoor unit of the air conditioner is detected by a temperature sensor.
6. The method for controlling the cold air prevention of the multi-stage electric auxiliary heating water multi-connected air conditioner according to claim 1, wherein the electric auxiliary heating can be started in at least two stages, and the higher the number of the starting stages is, the higher the heating power is.
7. The system for preventing cold wind of the multi-stage electric-assisted water multi-connected air conditioner is characterized by being used for realizing the control method for preventing cold wind of the multi-stage electric-assisted water multi-connected air conditioner as claimed in any one of claims 1 to 6.
8. An air conditioner, characterized by comprising a multi-stage electrically-assisted hot water multi-air conditioner cold wind prevention system as set forth in claim 7.
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| CN115468285B (en) * | 2022-08-22 | 2024-09-20 | 珠海格力电器股份有限公司 | Cold air prevention control method and device for floor heating air conditioner and floor heating air conditioner |
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| KR20000056494A (en) * | 1999-02-22 | 2000-09-15 | 구자홍 | Method for controlling driving of the air conditioner with heater |
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