CN110470031B - Control method for air conditioner indoor unit and air conditioner indoor unit - Google Patents
Control method for air conditioner indoor unit and air conditioner indoor unit Download PDFInfo
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- CN110470031B CN110470031B CN201910696196.5A CN201910696196A CN110470031B CN 110470031 B CN110470031 B CN 110470031B CN 201910696196 A CN201910696196 A CN 201910696196A CN 110470031 B CN110470031 B CN 110470031B
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- 238000000034 method Methods 0.000 title claims abstract description 31
- 238000010438 heat treatment Methods 0.000 claims abstract description 13
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 7
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 36
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 18
- 239000001569 carbon dioxide Substances 0.000 claims description 18
- 238000004378 air conditioning Methods 0.000 claims description 11
- 238000005057 refrigeration Methods 0.000 claims description 8
- 239000003507 refrigerant Substances 0.000 claims description 3
- 238000001816 cooling Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000009423 ventilation Methods 0.000 description 2
- 238000004590 computer program 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
- F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
- F24F1/0007—Indoor units, e.g. fan coil units
- F24F1/0018—Indoor units, e.g. fan coil units characterised by fans
- F24F1/0033—Indoor units, e.g. fan coil units characterised by fans having two or more fans
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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
- F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
- F24F1/0007—Indoor units, e.g. fan coil units
- F24F1/0035—Indoor units, e.g. fan coil units characterised by introduction of outside air to the room
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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
- F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
- F24F1/0007—Indoor units, e.g. fan coil units
- F24F1/0059—Indoor units, e.g. fan coil units characterised by heat exchangers
- F24F1/0063—Indoor units, e.g. fan coil units characterised by heat exchangers by the mounting or arrangement of the heat exchangers
-
- 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
-
- 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
-
- 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
- F24F2110/12—Temperature of the outside air
-
- 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
- F24F2110/50—Air quality properties
- F24F2110/65—Concentration of specific substances or contaminants
- F24F2110/70—Carbon dioxide
-
- 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)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Thermal Sciences (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention provides a control method for an air conditioner indoor unit and the air conditioner indoor unit. The indoor unit of the air conditioner comprises a first air supply fan, a second air supply fan, a first heat exchanger, a second heat exchanger and a fresh air device, wherein the first heat exchanger and the second heat exchanger are respectively arranged on an air inlet flow path of the first air supply fan and an air inlet flow path of the second air supply fan, and the fresh air device guides outdoor air to the upstream of the second heat exchanger. The control method comprises the following steps: acquiring an outdoor environment temperature and an indoor environment temperature; determining whether the indoor ambient temperature is closer to a user desired temperature than the outdoor ambient temperature; if so, starting the fresh air device, and enabling the temperature of the second heat exchanger to be lower than that of the first heat exchanger when the first heat exchanger and the second heat exchanger are in a refrigerating state; when the first heat exchanger and the second heat exchanger are in a heating state, the temperature of the second heat exchanger is higher than that of the first heat exchanger, so that outdoor air can be subjected to sufficient heat exchange, and the temperature difference of air flow blown out from the first air outlet and the second air outlet is reduced.
Description
Technical Field
The invention relates to the field of air conditioning, in particular to a control method for an air conditioner indoor unit and the air conditioner indoor unit.
Background
In order to avoid the problem of air quality such as excessive carbon dioxide concentration caused by poor ventilation in the indoor environment, a fresh air device communicated with the outdoor environment is usually added in the indoor unit to introduce the outdoor air into the indoor environment. However, the existing air conditioner indoor unit with the fresh air device has the technical problem that the temperature difference exists between the outdoor air temperature and the sensible temperature to cause discomfort of a user. In view of the above, there is a need for a control method for an air conditioning indoor unit having a fresh air device and an air conditioning indoor unit that can supply air comfortably.
Disclosure of Invention
An object of the first aspect of the present invention is to provide a control method for an air conditioner indoor unit having a fresh air device, which can supply air comfortably.
It is a further object of the first aspect of the invention to reduce the temperature difference between the airflows from the first and second air supply fans.
An object of the second aspect of the present invention is to provide an indoor unit of an air conditioner having a fresh air device.
According to a first aspect of the present invention, a control method for an air conditioning indoor unit is provided, where the air conditioning indoor unit includes a first air supply fan and a second air supply fan, a first heat exchanger and a second heat exchanger respectively disposed on air inlet flow paths of the first air supply fan and the second air supply fan, and a fresh air device for guiding outdoor air to an upstream of the second heat exchanger; the control method is characterized by comprising the following steps:
acquiring an outdoor environment temperature and an indoor environment temperature;
determining whether the indoor ambient temperature is closer to a user desired temperature than the outdoor ambient temperature;
if so, starting the fresh air device, and enabling the temperature of the second heat exchanger to be lower than that of the first heat exchanger when the first heat exchanger and the second heat exchanger are in a refrigeration state; and when the first heat exchanger and the second heat exchanger are in a heating state, the temperature of the second heat exchanger is higher than that of the first heat exchanger.
Optionally, the control method further includes:
if the outdoor environment temperature is closer to the user expected temperature than the indoor environment temperature, starting the fresh air device, and enabling the temperature of the first heat exchanger to be lower than that of the second heat exchanger when the first heat exchanger and the second heat exchanger are in a refrigeration state; and when the first heat exchanger and the second heat exchanger are in a heating state, the temperature of the first heat exchanger is higher than that of the second heat exchanger.
Optionally, the temperature difference between the first heat exchanger and the second heat exchanger is 40% -60% of the temperature difference between the outdoor environment temperature and the indoor environment temperature.
Optionally, the first air supply fan and the second air supply fan have the same rotation speed.
Optionally, the step of determining whether the indoor ambient temperature is closer to a user desired temperature than the outdoor ambient temperature comprises:
acquiring working states of the first heat exchanger and the second heat exchanger;
if the first heat exchanger and the second heat exchanger are in a refrigerating state, judging whether the outdoor environment temperature is greater than the indoor environment temperature, if so, the indoor environment temperature is closer to the user expected temperature than the outdoor environment temperature;
and if the first heat exchanger and the second heat exchanger are in a heating state, judging whether the outdoor environment temperature is lower than the indoor environment temperature, and if so, comparing the indoor environment temperature with the outdoor environment temperature to be closer to the user expected temperature.
Optionally, the step of determining whether the indoor ambient temperature is closer to a user desired temperature than the outdoor ambient temperature comprises:
acquiring the user expected temperature;
judging whether the temperature difference between the indoor environment temperature and the user expected temperature is less than or equal to the temperature difference between the outdoor environment temperature and the user expected temperature;
if so, the indoor ambient temperature is closer to the user desired temperature than the outdoor ambient temperature.
Optionally, the control method further includes:
acquiring the carbon dioxide concentration of the indoor environment;
judging whether the concentration of the carbon dioxide is greater than or equal to a preset concentration threshold value;
if yes, the fresh air device is started.
Optionally, the control method further includes:
acquiring an air quality index of an outdoor environment;
judging whether the air quality index is less than or equal to a preset quality threshold value or not;
if yes, starting the fresh air device; and/or
After the fresh air device is started, acquiring the concentration of carbon dioxide in the indoor environment;
judging whether the concentration of the carbon dioxide is smaller than the preset concentration threshold value;
if yes, the fresh air device is closed.
According to a second aspect of the present invention, there is also provided an indoor unit of an air conditioner, comprising a first air supply fan, a second air supply fan, a first heat exchanger and a second heat exchanger respectively disposed on air inlet flow paths of the first air supply fan and the second air supply fan, a fresh air device for guiding outdoor air to an upstream of the second heat exchanger, and a controller, wherein the controller is configured to execute any one of the above control methods.
Optionally, the first heat exchanger and the second heat exchanger are connected in parallel between the compressor and the outdoor heat exchanger; and is
And a flow valve is arranged between the first heat exchanger and/or the second heat exchanger and the outdoor heat exchanger so as to adjust the flow ratio of the refrigerant in the first heat exchanger and the second heat exchanger and further adjust the temperature of the first heat exchanger and the second heat exchanger.
Under the condition that the heat exchanger and the fresh air device both work, when the indoor environment temperature is closer to the temperature expected by a user than the outdoor environment temperature, the heat exchange efficiency of the second heat exchanger is higher than that of the first heat exchanger, so that the outdoor air can be subjected to sufficient heat exchange, the temperature difference of airflow blown out from the first air outlet and the second air outlet is reduced, and the user can be prevented from feeling discomfort caused by the temperature difference between the outdoor air and the indoor air.
Furthermore, when the outdoor environment temperature is closer to the user expected temperature than the indoor environment temperature, the heat exchange efficiency of the first heat exchanger is higher than that of the second heat exchanger, the refrigerating and heating efficiency of the indoor unit is improved, the temperature difference of air flows blown out of the first air outlet and the second air outlet is reduced, and the user experience is improved.
The above and other objects, advantages and features of the present invention will become more apparent to those skilled in the art from the following detailed description of specific embodiments thereof, taken in conjunction with the accompanying drawings.
Drawings
Some specific embodiments of the invention will be described in detail hereinafter by way of example and not by way of limitation with reference to the accompanying drawings. The same reference numbers in the drawings identify the same or similar elements or components. Those skilled in the art will appreciate that the drawings are not necessarily drawn to scale. In the drawings:
fig. 1 is a schematic cross-sectional view of an air conditioning indoor unit according to an embodiment of the present invention;
FIG. 2 is a schematic block diagram of a refrigeration system according to one embodiment of the present invention;
fig. 3 is a flowchart of a control method for an indoor unit of an air conditioner according to an embodiment of the present invention;
fig. 4 is a detailed flowchart of a control method for an air conditioning indoor unit according to a preferred embodiment of the present invention.
Detailed Description
Fig. 1 is a schematic cross-sectional view of an air conditioning indoor unit according to one embodiment of the present invention. Referring to fig. 1, the indoor unit 100 of the air conditioner may include a casing 110, a first supply fan 120, a second supply fan 130, a refrigeration system 140, a fresh air device, and a controller (not shown) storing a computer program.
The casing 110 may be provided with a casing inlet 111 for air to flow into, and a first outlet 112 and a second outlet 113 for air to flow out. The housing air inlet 111 may be opened at a rear wall of the housing 110, and the first air outlet 112 may be opened at a front wall of the housing 110.
The first and second air supply fans 120 and 130 may be disposed in the cabinet 110 and configured to draw air from the surrounding environment of the cabinet air inlet 111 and force the air to flow toward the first and second air outlets 112 and 113, respectively.
The first and second air supply fans 120 and 130 may be the same in type. The first and second blower fans 120 and 130 may be both centrifugal fans to increase the amount of air supplied to the indoor unit 100.
Fig. 2 is a schematic block diagram of a refrigeration system 140 according to one embodiment of the present invention. Referring to fig. 1 and 2, the refrigeration system 140 may include a compressor 141, an outdoor heat exchanger 142, first and second heat exchangers 144a and 144b connected in parallel between the compressor 141 and the outdoor heat exchanger 142, first and second capillary tubes 143a and 143b connected in series with the first and second heat exchangers 144a and 144b, respectively, and a flow valve 145 disposed between the first and second heat exchangers 144a and 144b and the outdoor heat exchanger 142. Wherein the compressor 141 and the outdoor heat exchanger 142 are disposed in an outdoor environment.
The first heat exchanger 144a and the second heat exchanger 144b are respectively disposed on the intake air flow paths of the first air supply fan 120 and the second air supply fan 130, and exchange heat with air flowing therethrough to change the temperature of the air flowing therethrough into heat exchange air. The heat exchange area of the first heat exchanger 144a and the second heat exchanger 144b may be the same.
The flow valve 145 may be a three-way valve, and is respectively communicated with the first capillary tube 143a, the second capillary tube 143b, and the outdoor heat exchanger 142, so as to adjust the refrigerant flow ratio in the first heat exchanger 144a and the second heat exchanger 144b, and further adjust the temperature of the first heat exchanger 144a and the second heat exchanger 144 b. The flow valve 145 may also be a two-way valve, which is connected in series between the first capillary tube 143a and the outdoor heat exchanger 142 or between the second capillary tube 143b and the outdoor heat exchanger 142.
The fresh air device may include a fresh air duct 151 having a fresh air inlet and a fresh air outlet, and a fresh air impeller 152 disposed in the fresh air duct 151, wherein the fresh air inlet may communicate with the outdoor environment through a fresh air duct 160, and the fresh air impeller 152 may be configured to suck outdoor air through the fresh air inlet and cause the outdoor air to flow to the upstream of the first heat exchanger 144a and the second heat exchanger 144b through the fresh air duct 151, thereby exchanging heat with the first heat exchanger 144a and the second heat exchanger 144 b.
In some embodiments, the fresh air duct 151 may be configured to direct the outdoor air upstream of the second heat exchanger 144 b. That is, the distance between the fresh air outlet of the fresh air duct 151 and the fan inlet of the first air supply fan 120 may be greater than the distance between the fresh air outlet of the fresh air duct and the fan inlet of the second air supply fan 130. In other words, the flow path of the outdoor air into the first supply fan 120 is longer than the flow path into the second supply fan 130.
In some embodiments, the first blower fan 120, the second blower fan 130 and the fresh air device may be disposed in the casing 110 from top to bottom. The indoor unit 100 may further include an air guide cover plate 170, and the air guide cover plate 170 is disposed at a rear side of the rear wall of the cabinet 110 and communicates with a fresh air outlet of the fresh air device and a bottom area of the cabinet air inlet 111 to guide outdoor air to an upstream of the second heat exchanger 144 b.
In other embodiments, the first air supply fan 120, the second air supply fan 130 and the fresh air device may be disposed in the casing 110 from bottom to top. In this embodiment, the air guiding cover plate 170 may be disposed to communicate with the fresh air outlet of the fresh air device and the top area of the air inlet 111 of the casing.
In still other embodiments, the first supply fan 120, the second supply fan 130 and the fresh air device may be disposed in the casing 110 in sequence along a horizontal direction. In this embodiment, the air guiding cover plate 170 may be configured to communicate with the fresh air outlet of the fresh air device and the area of the housing inlet 111 near the second air supply fan 130.
In still other embodiments, a fresh air device may be disposed between the first and second supply fans 120, 130. In this embodiment, the air guiding cover plate 170 may be configured to connect the fresh air outlet of the fresh air device and the casing air inlet 111 on two sides of the fresh air outlet.
In particular, in the event that both the heat exchanger and the fresh air device are operating and the indoor ambient temperature is closer to the user desired temperature than the outdoor ambient temperature, the controller may be configured to adjust the temperature of the first heat exchanger 144a and/or the second heat exchanger 144b to make the temperature of the second heat exchanger 144b lower than the temperature of the first heat exchanger 144a when the first heat exchanger 144a and the second heat exchanger 144b are in the cooling state; the temperature of the first heat exchanger 144a and/or the second heat exchanger 144b is adjusted such that the temperature of the second heat exchanger 144b is higher than the temperature of the first heat exchanger 144a when the first heat exchanger 144a and the second heat exchanger 144b are in the heating state. The approach to the user desired temperature may be an approach to the user desired temperature trend (colder or hotter), or may be an approach to the user set temperature value.
Under the condition that the heat exchanger and the fresh air device both work, when the indoor environment temperature is closer to the temperature expected by a user than the outdoor environment temperature, the heat exchange efficiency of the second heat exchanger 144b is higher than that of the first heat exchanger 144a, so that the outdoor air can be fully exchanged heat, the temperature difference of air flows blown out of the first air outlet and the second air outlet is reduced, and the user is prevented from feeling discomfort caused by the temperature difference between the outdoor air and the indoor air.
Further, in the case where both the heat exchanger and the fresh air device are operating and the outdoor ambient temperature is closer to the user's desired temperature than the indoor ambient temperature, the controller may be configured to adjust the temperature of the first heat exchanger 144a and/or the second heat exchanger 144b to make the temperature of the first heat exchanger 144a lower than the temperature of the second heat exchanger 144b when the first heat exchanger 144a and the second heat exchanger 144b are in the cooling state; when the first heat exchanger 144a and the second heat exchanger 144b are in a heating state, the temperature of the first heat exchanger 144a and/or the second heat exchanger 144b is adjusted to make the temperature of the first heat exchanger 144a higher than that of the second heat exchanger 144b, so that the cooling and heating efficiency of the indoor unit is improved, the temperature difference of airflows blown out from the first air outlet and the second air outlet is further reduced, and the user experience is improved.
In the present invention, the temperature of the first heat exchanger 144a and the second heat exchanger 144b can be adjusted at the same time when the fresh air device is turned on, or after the fresh air device is turned on for a period of time.
Indoor ambient temperature can be for user's body feeling temperature to carry out accurate ground temperature regulation to the outdoor air that introduces, and then improve user experience.
In some embodiments, the temperature difference between the first heat exchanger 144a and the second heat exchanger 144b may be 40% to 60%, for example, 40%, 50%, or 60%, of the temperature difference between the outdoor environment temperature and the indoor environment temperature, so as to reduce the temperature difference between the airflows blown out from the first air outlet and the second air outlet while sufficiently exchanging heat with the outdoor air. In the present invention, the temperature difference is an absolute value of the subtraction of two temperatures.
In some embodiments, the rotation speeds of the first air supply fan and the second air supply fan may be the same, so that the air flow volumes blown out by the first air outlet and the second air outlet are the same, and the air supply comfort level is improved. In other embodiments, the ratio of the rotation speeds of the first air supply fan and the second air supply fan may be adjusted according to a user's desired temperature.
In some embodiments, whether the indoor ambient temperature is closer to the user desired temperature than the outdoor ambient temperature may be determined according to the operating states of the first and second heat exchangers 144a and 144b, and the outdoor ambient temperature and the indoor ambient temperature.
When the first and second heat exchangers 144a and 144b are in the cooling state and the outdoor ambient temperature is greater than the indoor ambient temperature, or when the first and second heat exchangers 144a and 144b are in the heating state and the outdoor ambient temperature is less than the indoor ambient temperature, the indoor ambient temperature is closer to the user desired temperature than the outdoor ambient temperature; otherwise, the outdoor ambient temperature is closer to the user desired temperature than the indoor ambient temperature.
In other embodiments, whether the indoor ambient temperature is closer to the user desired temperature than the outdoor ambient temperature may be determined according to the desired temperature value set by the user, and the outdoor ambient temperature and the indoor ambient temperature.
When the temperature difference between the indoor environment temperature and the user desired temperature is less than or equal to the temperature difference between the outdoor environment temperature and the user desired temperature, the indoor environment temperature is closer to the user desired temperature than the outdoor environment temperature; otherwise, the outdoor ambient temperature is closer to the user desired temperature than the indoor ambient temperature.
In some embodiments, the controller may be configured to activate the fresh air device based on a carbon dioxide concentration of the indoor environment. Specifically, when the carbon dioxide concentration of the indoor environment is greater than or equal to the preset concentration threshold value, the fresh air device is started to ventilate the indoor environment. The predetermined concentration threshold may be 800-1000 PPM, such as 800PPM, 900PPM, or 1000 PPM.
The controller may be further configured to activate the fresh air device based on an air quality index of the outdoor environment based on the carbon dioxide concentration of the indoor environment to prevent the indoor environment from being contaminated. Specifically, when the carbon dioxide concentration of the indoor environment is greater than or equal to a preset concentration threshold value and the air quality index of the outdoor environment is less than or equal to a preset quality threshold value, the fresh air device is started. The air quality index may be determined according to GB 3095-2012. The predetermined quality threshold may be 50 to 100, such as 50, 70, 80 or 100.
The controller may be configured to turn off the fresh air device and stop ventilating the indoor environment when the concentration of carbon dioxide in the indoor environment is less than a preset concentration threshold.
Fig. 3 is a flowchart of a control method for an air conditioning indoor unit according to an embodiment of the present invention. Referring to fig. 3, the control method for the air conditioning indoor unit 100 performed by the controller according to any one of the above embodiments of the present invention may include the steps of:
step S302: and acquiring the outdoor ambient temperature and the indoor ambient temperature.
Step S304: it is determined whether the indoor ambient temperature is closer to the user desired temperature than the outdoor ambient temperature.
Step S306: if so, the fresh air device is started, the temperature of the second heat exchanger 144b is lower than that of the first heat exchanger 144a when the first heat exchanger 144a and the second heat exchanger 144b are in a refrigerating state, and the temperature of the second heat exchanger 144b is higher than that of the first heat exchanger 144a when the first heat exchanger 144a and the second heat exchanger 144b are in a heating state, so that the outdoor air can be subjected to sufficient heat exchange, the temperature difference of the air flow blown out from the first air outlet and the second air outlet is reduced, and the user can be prevented from feeling discomfort caused by the temperature difference between the outdoor air and the indoor air.
Fig. 4 is a detailed flowchart of a control method for an indoor unit of an air conditioner in accordance with a preferred embodiment of the present invention. Referring to fig. 4, the control method for the indoor unit 100 of an air conditioner of the present invention may include the following detailed steps:
step S402: and acquiring the carbon dioxide concentration of the indoor environment.
Step S404: and judging whether the carbon dioxide concentration of the indoor environment is greater than or equal to a preset concentration threshold value or not. If yes, go to step S406; if not, the process returns to step S402. In this step, the predetermined concentration threshold may be 800 to 1000 PPM.
Step S406: an air quality index of an outdoor environment is obtained. In this step, the air quality index may be determined according to GB 3095-2012.
Step S408: and judging whether the air quality index of the outdoor environment is less than or equal to a preset quality threshold value. If yes, go to step S410; if not, the process returns to step S402. In this step, the predetermined quality threshold may be 50 to 100.
Step S410: the indoor ambient temperature, the outdoor ambient temperature, and the operating states of the first heat exchanger 144a and the second heat exchanger 144b are acquired.
Step S412: it is determined whether the first heat exchanger 144a and the second heat exchanger 144b cool. If yes, go to step S414; if not, go to step S416.
Step S414: and judging whether the outdoor environment temperature is greater than the indoor environment temperature. If yes, go to step S418; if not, go to step S420.
Step S416: and judging whether the outdoor environment temperature is lower than the indoor environment temperature. If yes, go to step S420; if not, go to step S418.
Step S418: the fresh air device is started, and the temperature of the first heat exchanger 144a and/or the second heat exchanger 144b is adjusted to make the temperature of the second heat exchanger 144b lower than the temperature of the first heat exchanger 144 a.
Step S420: the fresh air device is started, and the temperature of the first heat exchanger 144a and/or the second heat exchanger 144b is adjusted to make the temperature of the second heat exchanger 144b higher than that of the first heat exchanger 144 a. Step S422 is performed.
Step S422: and acquiring the carbon dioxide concentration of the indoor environment.
Step S424: and judging whether the concentration of the carbon dioxide in the indoor environment is less than a preset concentration threshold value. If yes, go to step S426; if not, the process returns to step S422.
Step S426: and closing the fresh air device to stop ventilating the indoor environment, returning to the step S402 and starting the next ventilation cycle.
Thus, it should be appreciated by those skilled in the art that while a number of exemplary embodiments of the invention have been illustrated and described in detail herein, many other variations or modifications consistent with the principles of the invention may be directly determined or derived from the disclosure of the present invention without departing from the spirit and scope of the invention. Accordingly, the scope of the invention should be understood and interpreted to cover all such other variations or modifications.
Claims (9)
1. A control method for an air-conditioning indoor unit comprises a first air supply fan, a second air supply fan, a first heat exchanger, a second heat exchanger and a fresh air device, wherein the first heat exchanger and the second heat exchanger are respectively arranged on an air inlet flow path of the first air supply fan and an air inlet flow path of the second air supply fan; the control method is characterized by comprising the following steps:
acquiring an outdoor environment temperature and an indoor environment temperature;
determining whether the indoor ambient temperature is closer to a user desired temperature than the outdoor ambient temperature;
if so, starting the fresh air device, and enabling the temperature of the second heat exchanger to be lower than that of the first heat exchanger when the first heat exchanger and the second heat exchanger are in a refrigeration state; when the first heat exchanger and the second heat exchanger are in a heating state, the temperature of the second heat exchanger is higher than that of the first heat exchanger;
if not, starting the fresh air device, and enabling the temperature of the first heat exchanger to be lower than that of the second heat exchanger when the first heat exchanger and the second heat exchanger are in a refrigeration state; and when the first heat exchanger and the second heat exchanger are in a heating state, the temperature of the first heat exchanger is higher than that of the second heat exchanger.
2. The control method according to claim 1,
the temperature difference between the first heat exchanger and the second heat exchanger is 40-60% of the temperature difference between the outdoor environment temperature and the indoor environment temperature.
3. The control method according to claim 1,
the first air supply fan and the second air supply fan have the same rotating speed.
4. The control method of claim 1, wherein the step of determining whether the indoor ambient temperature is closer to a user desired temperature than the outdoor ambient temperature comprises:
acquiring working states of the first heat exchanger and the second heat exchanger;
if the first heat exchanger and the second heat exchanger are in a refrigerating state, judging whether the outdoor environment temperature is greater than the indoor environment temperature, if so, the indoor environment temperature is closer to the user expected temperature than the outdoor environment temperature;
if the first heat exchanger and the second heat exchanger are in a heating state, whether the outdoor environment temperature is lower than the indoor environment temperature is judged, and if yes, the indoor environment temperature is closer to the user expected temperature than the outdoor environment temperature.
5. The control method of claim 1, wherein the step of determining whether the indoor ambient temperature is closer to a user desired temperature than the outdoor ambient temperature comprises:
acquiring the user expected temperature;
judging whether the temperature difference between the indoor environment temperature and the user expected temperature is less than or equal to the temperature difference between the outdoor environment temperature and the user expected temperature;
if so, the indoor ambient temperature is closer to the user desired temperature than the outdoor ambient temperature.
6. The control method according to claim 1, characterized by further comprising:
acquiring the carbon dioxide concentration of the indoor environment;
judging whether the concentration of the carbon dioxide is greater than or equal to a preset concentration threshold value;
if yes, the fresh air device is started.
7. The control method according to claim 6, characterized by further comprising:
acquiring an air quality index of an outdoor environment;
judging whether the air quality index is less than or equal to a preset quality threshold value or not;
if yes, starting the fresh air device; and/or
After the fresh air device is started, acquiring the concentration of carbon dioxide in the indoor environment;
judging whether the concentration of the carbon dioxide is smaller than the preset concentration threshold value;
if yes, the fresh air device is closed.
8. An indoor unit of an air conditioner, comprising a first air supply fan, a second air supply fan, a first heat exchanger, a second heat exchanger, a fresh air device and a controller, wherein the first heat exchanger and the second heat exchanger are respectively arranged on an air inlet flow path of the first air supply fan and an air inlet flow path of the second air supply fan, the fresh air device guides outdoor air to the upstream of the second heat exchanger, and the controller is configured to execute the control method of any one of claims 1 to 7.
9. An indoor unit of an air conditioner according to claim 8,
the first heat exchanger and the second heat exchanger are connected between the compressor and the outdoor heat exchanger in parallel; and is
And a flow valve is arranged between the first heat exchanger and/or the second heat exchanger and the outdoor heat exchanger so as to adjust the flow ratio of the refrigerant in the first heat exchanger and the second heat exchanger and further adjust the temperature of the first heat exchanger and the second heat exchanger.
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