CN112923510B - Natural convection type air conditioner, refrigeration control method thereof and storage medium - Google Patents
Natural convection type air conditioner, refrigeration control method thereof and storage medium Download PDFInfo
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- CN112923510B CN112923510B CN201911244418.6A CN201911244418A CN112923510B CN 112923510 B CN112923510 B CN 112923510B CN 201911244418 A CN201911244418 A CN 201911244418A CN 112923510 B CN112923510 B CN 112923510B
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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
- F24F11/62—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
- F24F11/62—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
- F24F11/70—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
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
- F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
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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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- 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
Abstract
The application discloses a natural convection type air conditioner, a refrigeration control method thereof and a storage medium. The refrigeration control method comprises the following steps: responding to a refrigeration instruction of a user to enter a refrigeration mode; in a refrigeration mode, cooling adjustment and heating adjustment are carried out on the heat exchanger in a circulating mode, so that air forms refrigeration airflow through natural convection under the action of temperature difference; the temperature reduction adjustment comprises the steps of gradually reducing the temperature of the heat exchanger to a first preset temperature interval; the temperature rise regulation comprises the step of gradually raising the temperature of the heat exchanger from a first preset temperature interval to a second preset temperature interval, wherein the first preset temperature interval is lower than the frost point temperature, and the second preset temperature interval is higher than the frost point temperature. This application embodiment is through cooling down the regulation and rising temperature regulation to the heat exchanger for the temperature of heat exchanger is below 0 ℃ and cyclic variation more than 0 ℃, carries out abundant heat transfer between the heat exchanger of being convenient for and the air, and then strengthens the heat transfer effect of natural convection, promotes the refrigeration performance of natural convection type air conditioner.
Description
Technical Field
The present disclosure relates to air conditioners, and particularly to a natural convection type air conditioner, a refrigeration control method thereof, and a storage medium.
Background
At present, most of air conditioners adopt a fan to perform heat exchange in a forced convection mode, so that indoor cooling is realized. The characteristic of this kind of cooling at that time is that the amount of wind is great, and the sense of blowing is stronger, probably causes the discomfort of user's use when indoor temperature reduces. And the problem of low refrigerating capacity may exist by completely adopting natural convection heat transfer.
Disclosure of Invention
The application mainly provides a natural convection type air conditioner, a refrigeration control method and a storage medium thereof, and aims to solve the technical problem that the refrigeration capacity of the air conditioner is low.
In order to solve the technical problem, the application adopts a technical scheme that: provided is a refrigeration control method of a natural convection type air conditioner, including: responding to a refrigeration instruction of a user to enter a refrigeration mode; in the refrigeration mode, the heat exchanger is subjected to cooling regulation and heating regulation in a circulating mode, so that air forms refrigeration airflow through natural convection under the action of temperature difference; the temperature reduction adjustment comprises the step of gradually reducing the temperature of the heat exchanger to a first preset temperature interval; the temperature rise adjustment comprises the step of gradually increasing the temperature of the heat exchanger from a first preset temperature interval to a second preset temperature interval, wherein the first preset temperature interval is lower than the frost point temperature, and the second preset temperature interval is higher than the frost point temperature.
In some embodiments, the step of adjusting the temperature of the heat exchanger in a cooling mode and the step of adjusting the temperature of the heat exchanger in a circulating manner includes: and adjusting the temperature of the heat exchanger by adjusting the operating frequency of a compressor connected with the heat exchanger and/or the opening of a throttle valve on a refrigerant passage connected with the heat exchanger.
In some embodiments, the cooling adjustment causes frost to form on the heat exchanger surface, and the warming adjustment causes the frost on the heat exchanger surface to melt to form flowing defrosting water.
In some embodiments, the minimum value of the first preset temperature interval is equal to a first preset temperature minus a first temperature tolerance, and the maximum value of the first preset temperature interval is equal to the first preset temperature plus the first temperature tolerance; the minimum value of the second preset temperature interval is equal to the second preset temperature minus a second temperature tolerance, and the maximum value of the second preset temperature interval is equal to the second preset temperature plus the second temperature tolerance.
In some embodiments, before the temperature-lowering adjustment is completed and the temperature-raising adjustment is started, the heat exchanger is further subjected to a first temperature-keeping operation, so that a difference between the temperature of the refrigerant gas flow and the first preset temperature is less than or equal to a first preset difference.
In some embodiments, said step of operating said heat exchanger at a first hold temperature such that the difference between the temperature of said refrigerant gas stream and said first preset temperature is less than or equal to a first preset difference comprises: acquiring the temperature of the heat exchanger and the temperature of the refrigerating airflow; and responding to the temperature of the heat exchanger in the first preset temperature range, and performing first heat preservation operation on the heat exchanger until the difference between the obtained temperature of the refrigerating airflow and the first preset temperature is smaller than or equal to the first preset difference.
In some embodiments, said step of operating said heat exchanger at a first hold temperature such that the difference between the temperature of said refrigerant gas stream and said first preset temperature is less than or equal to a first preset difference comprises: acquiring first preset time and second preset time; and carrying out first heat preservation operation on the heat exchanger between the first preset time and the second preset time.
In some embodiments, before the temperature-raising adjustment is completed and the temperature-lowering adjustment is started, the heat exchanger is further subjected to a second soak operation so that a difference between the temperature of the refrigerant gas flow and the second preset temperature is greater than or equal to a second preset difference.
In some embodiments, said step of subjecting said heat exchanger to a second soak operation such that the difference between the temperature of said refrigerant gas stream and said second preset temperature is greater than or equal to a second preset difference comprises: acquiring the temperature of the heat exchanger and the temperature of the refrigerating airflow; and responding to the temperature of the heat exchanger in the second preset temperature interval, and carrying out second heat preservation operation on the heat exchanger until the difference between the obtained temperature of the refrigerating airflow and the second preset temperature is larger than or equal to the second preset difference.
In some embodiments, the step of operating the heat exchanger for a second hold warm operation such that the difference between the temperature of the refrigerant gas stream and the second predetermined temperature is greater than or equal to a second predetermined difference comprises: acquiring third preset time and fourth preset time; and carrying out second heat preservation operation on the heat exchanger between the third preset time and the fourth preset time.
In some embodiments, the first predetermined temperature is equal to or greater than-5 ℃ and equal to or less than-2 ℃, the second predetermined temperature is equal to or greater than 2 ℃ and equal to or less than 5 ℃, the first predetermined difference is equal to or greater than 0 ℃ and equal to or less than 3 ℃, and the second predetermined difference is equal to or greater than 2 ℃ and equal to or less than 5 ℃.
In order to solve the above technical problem, another technical solution adopted by the present application is: there is provided a natural convection type air conditioner comprising a processor and a memory connected to each other, the memory storing a computer program which, when executed by the processor, implements the steps of the refrigeration control method as described hereinbefore.
In order to solve the above technical problem, the present application adopts another technical solution: a storage medium is provided having stored thereon program data which, when executed by a processor, carry out the steps of the refrigeration control method as described hereinbefore.
The beneficial effect of this application is: the present application discloses a natural convection type air conditioner, a refrigeration control method thereof, and a storage medium, which are distinguished from the state of the art. This application embodiment is through cooling down the regulation and rising temperature regulation to the heat exchanger to make the temperature of heat exchanger below 0 ℃ and cyclic variation more than 0 ℃, can make the heat exchanger be in the process of frosting and changing frost always, and then make the heat exchanger and the air that contacts with the heat exchanger between the difference in temperature great, be convenient for carry out abundant heat transfer between heat exchanger and the air, and then strengthen the heat transfer effect of natural convection, promote the refrigeration performance of natural convection type air conditioner.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative efforts, wherein:
FIG. 1 is a schematic flow diagram of a refrigeration control method provided herein;
FIG. 2 is a schematic flow chart illustrating a first operation of maintaining the temperature of the heat exchanger according to an embodiment of the present disclosure;
FIG. 3 is a schematic flow chart illustrating a first heat-preserving operation performed on a heat exchanger according to another embodiment of the present application;
FIG. 4 is a schematic flow chart illustrating a second soak operation performed on the heat exchanger according to an embodiment of the present disclosure;
FIG. 5 is a schematic flow chart illustrating a second soak operation performed on the heat exchanger according to another embodiment of the present application;
FIG. 6 is a schematic flow chart illustrating a refrigeration control method according to an embodiment of the present application;
fig. 7 is a diagram showing effects of controlling the natural convection type air conditioner using the refrigeration control method of fig. 6;
FIG. 8 is a schematic structural diagram of an embodiment of a storage medium provided in the present application;
fig. 9 is a schematic structural diagram of an embodiment of a natural convection type air conditioner provided in the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The terms "first", "second" and "third" in the embodiments of the present application are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," or "third" may explicitly or implicitly include at least one of the feature. In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless explicitly specified otherwise. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.
Because the temperature difference exists in the fluid, the density of the fluid in each part is different, and the density of the fluid with high temperature is small and is increased inevitably; the fluid with low temperature has large density and is necessarily reduced, thereby causing the flow inside the fluid to be natural convection. This heat transfer phenomenon, which is caused by the fluid flowing due to the internal temperature difference of the fluid without the action of external mechanical force, is called natural convection heat transfer. The application provides a refrigeration control method of a natural convection type air conditioner, which is used for the natural convection type air conditioner. The natural convection type air conditioner is an air conditioner that realizes air supply by using a temperature difference between air. Because no external mechanical force is used, the silencing effect is better, and energy can be saved.
Referring to fig. 1, fig. 1 is a schematic flow chart of a refrigeration control method provided in the present application. Specifically, the refrigeration control method includes:
step S101: and responding to a refrigeration command of a user to enter a refrigeration mode.
A refrigeration control is arranged on a remote control device or a control panel of the natural convection type air conditioner, and when a user triggers a refrigeration instruction based on the refrigeration control, the natural convection type air conditioner responds to the refrigeration instruction to enter a refrigeration mode.
Step S102: in a refrigeration mode, cooling and heating regulation are carried out on the heat exchanger in a circulating mode, so that air forms refrigeration airflow through natural convection under the action of temperature difference; the temperature reduction regulation comprises the steps of gradually reducing the temperature of the heat exchanger to a first preset temperature interval; the temperature rise regulation comprises the step of gradually raising the temperature of the heat exchanger from a first preset temperature interval to a second preset temperature interval, wherein the first preset temperature interval is lower than the frost point temperature, and the second preset temperature interval is higher than the frost point temperature.
Wherein, the frost point temperature refers to the temperature of the air when the air is cooled to saturation under the condition that the water vapor content and the air pressure are not changed. That is, the frost point temperature depends on the moisture content and the air pressure of the current environment, and thus, the frost point temperature may be 0 ℃, 0 ℃ or more, or 0 ℃ or less. For convenience of description, in the present embodiment, the frost point temperature at standard atmospheric pressure, i.e., 0 ℃. The cooling air flow refers to air flow supplied by a natural convection type air conditioner.
In the cooling mode, the natural convection type air conditioner performs cooling adjustment and heating adjustment on the heat exchanger so that the temperature of the heat exchanger is cyclically changed between below 0 ℃ and above 0 ℃, so that when the temperature of the heat exchanger is below 0 ℃, frost is condensed on the surface of the heat exchanger, and when the temperature of the heat exchanger is above 0 ℃, the frost condensed on the surface of the heat exchanger is melted to form defrosting water.
This application embodiment is through cooling down the regulation and rising temperature regulation to the heat exchanger to make the temperature of heat exchanger below 0 ℃ and cyclic variation more than 0 ℃, can make the heat exchanger be in the process of frosting and changing frost always, and then make the heat exchanger and the air that contacts with the heat exchanger between the difference in temperature great, be convenient for carry out abundant heat transfer between heat exchanger and the air, and then strengthen the heat transfer effect of natural convection, promote the refrigeration performance of natural convection type air conditioner.
The minimum value of the first preset temperature interval is equal to the first preset temperature minus a first temperature tolerance, and the maximum value of the first preset temperature interval is equal to the first preset temperature plus the first temperature tolerance. The minimum value of the second preset temperature interval is equal to the second preset temperature minus a second temperature tolerance, and the maximum value of the second preset temperature interval is equal to the second preset temperature plus the second temperature tolerance. The first preset temperature, the second preset temperature, the first temperature tolerance, and the second temperature tolerance are previously stored inside the natural convection type air conditioner. In order to improve the refrigeration temperature difference and simultaneously consider the frost blocking time, the first preset temperature can be set to be more than or equal to minus 5 ℃ and less than or equal to minus 2 ℃. For example, the first preset temperature may be set to-5 ℃, -4.5 ℃, -4 ℃, -3.5 ℃, -3 ℃, -2.5 ℃, or-2 ℃ or the like. In order to increase the refrigeration temperature difference while considering the defrosting time, the second preset temperature may be set to be 2 ℃ or higher and 5 ℃ or lower. For example, the second preset temperature may be set to 2 ℃, 2.5 ℃, 3 ℃, 3.5 ℃, 4 ℃, 4.5 ℃ or 5 ℃ or the like. In order to improve the control precision, the first temperature tolerance is greater than or equal to 0 ℃ and less than or equal to 1 ℃, and the second temperature tolerance is greater than or equal to 0 ℃ and less than or equal to 1 ℃. For example, the first temperature tolerance and the second temperature tolerance may be set to 0 ℃, 0.1 ℃, 0.2 ℃, 0.3 ℃, 0.4 ℃, 0.5 ℃, 0.6 ℃, 0.7 ℃, 0.8 ℃, 0.9 ℃ or 1 ℃ or the like. The first temperature tolerance and the second temperature tolerance may be equal or different in size, and the embodiment of the present invention is not particularly limited.
In some embodiments, in the cooling mode, the step of adjusting the temperature of the heat exchanger in a circulating manner includes: the temperature of the heat exchanger is adjusted by adjusting the operating frequency of the compressor connected to the heat exchanger.
In particular, when the natural convection type air conditioner is a home air conditioner, the temperature of the heat exchanger may be adjusted by adjusting the operating frequency of the compressor. Wherein, when the operation frequency of the compressor is increased, the circulation amount of the refrigerant is increased, and the temperature of the heat exchanger is decreased. When the operating frequency of the compressor is lowered, the circulation amount of the refrigerant is decreased, and the temperature of the heat exchanger is increased. Therefore, the present embodiment can adjust the temperature of the heat exchanger by adjusting the operating frequency of the compressor.
In another embodiment, the step of adjusting the temperature of the heat exchanger in a cooling mode in a cyclic manner includes: the temperature of the heat exchanger is adjusted by adjusting the opening of a throttle valve on a refrigerant passage connected with the heat exchanger.
Specifically, when the natural convection type air conditioner is a central air conditioner, the temperature of the heat exchanger may be adjusted by adjusting the opening degree of a throttle valve on a refrigerant passage connected to the heat exchanger. Wherein, when the opening degree of the throttle valve is smaller, the flowing speed of the refrigerant is faster, and the temperature of the heat exchanger is lower. When the opening degree of the throttle valve is larger, the flowing speed of the refrigerant is slower, and the temperature of the heat exchanger is higher. Therefore, the temperature of the heat exchanger can be adjusted by adjusting the opening degree of the throttle valve on the refrigerant passage connected with the heat exchanger.
In another embodiment, a fan may be further disposed in the natural convection type air conditioner to assist air supply by the fan, and the temperature of the heat exchanger may be adjusted by adjusting the rotation speed of the fan.
In other embodiments, the temperature of the heat exchanger may also be changed in other types of manners, and the embodiments of the present application are not particularly limited.
It can be understood that, not only the operating frequency of the compressor or the opening of the throttle valve can be controlled individually to control the temperature of the heat exchanger, but also two or more of the above manners can be combined to control the temperature of the heat exchanger, so as to shorten the adjusting time of the temperature of the heat exchanger and improve the adjusting efficiency of the heat exchanger.
Further, the frosting is formed on the surface of the heat exchanger through temperature reduction adjustment, and the flowing defrosting water is formed through melting the frosting on the surface of the heat exchanger through temperature rise adjustment.
Specifically, in the cooling adjustment process, the natural convection type air conditioner firstly adjusts the temperature of the heat exchanger to reduce the temperature of the heat exchanger to below 0 ℃, and at the moment, when water vapor in the air meets the heat exchanger with the surface temperature below 0 ℃, the water vapor can be condensed on the surface of the heat exchanger to form frost. Then, in the temperature rise adjusting process, the temperature of the heat exchanger is gradually increased to enable the temperature of the heat exchanger to be increased to be higher than 0 ℃, at the moment, frost condensed on the surface of the heat exchanger can be melted, and when the volume of melted defrosting water reaches a certain value, the defrosting water can flow under the action of gravity to form flowing defrosting water. This embodiment is through forming the flowing defrosting water, and the in-process that flows at the defrosting water can play the effect of pulling the promotion to the flow of air, and then promotes the heat transfer effect of natural convection type air conditioner.
Further, in this embodiment, before the temperature-decreasing adjustment is completed and the temperature-increasing adjustment is started, the heat exchanger is further subjected to a first temperature-maintaining operation, so that a difference between the temperature of the refrigerant airflow and the first preset temperature is smaller than or equal to a first preset difference.
When the difference between the temperature of the cooling air flow and the temperature of the heat exchanger is smaller than or equal to the first preset difference, it indicates that frost condensed on the outer surface of the heat exchanger has a large influence on the heat exchanger, and at this time, a defrosting operation is required. The size of the first preset difference value may be obtained according to experimental analysis, or may be set according to experience, and the application is not particularly limited.
In this embodiment, the first preset difference may be set to be greater than or equal to 0 ℃ and less than or equal to 3 ℃. For example, the first predetermined difference may be 0 ℃, 0.5 ℃, 1 ℃, 1.5 ℃, 2 ℃, 2.5 ℃ or 3 ℃.
In some embodiments, the conditioning process may be controlled by sensing the temperature of the heat exchanger and the temperature of the refrigerant gas stream. Specifically, referring to fig. 2, fig. 2 is a schematic flow chart illustrating a first heat preservation operation performed on a heat exchanger according to an embodiment of the present application. In this embodiment, the step of performing the first temperature keeping operation on the heat exchanger so that the difference between the temperature of the refrigerant airflow and the first preset temperature is smaller than or equal to the first preset difference comprises:
step S201: the temperature of the heat exchanger and the temperature of the refrigerant gas flow are obtained.
Specifically, a temperature sensor corresponding to the heat exchanger and a temperature sensor corresponding to the air outlet are provided inside the natural convection type air conditioner, the temperature sensor corresponding to the heat exchanger is used to detect the temperature of the heat exchanger, and the temperature sensor corresponding to the air outlet is used to detect the temperature of the cooling airflow.
In some embodiments, the natural convection type air conditioner may obtain the temperature of the heat exchanger and the temperature of the cooling air flow in real time, so that the detection result is more accurate. In another embodiment, the natural convection type air conditioner may also periodically detect the temperature of the heat exchanger and the temperature of the refrigerant air flow at a predetermined frequency, and the embodiment of the present application is not particularly limited.
Step S202: and responding to the temperature of the heat exchanger in a first preset temperature interval, and performing first heat preservation operation on the heat exchanger until the difference between the obtained temperature of the refrigerating airflow and the first preset temperature is smaller than or equal to a first preset difference.
In step S202, if the temperature of the heat exchanger detected by the temperature sensor corresponding to the heat exchanger is not within the first preset temperature interval, it indicates that the temperature of the heat exchanger has not reached the optimal frosting temperature yet, which indicates that the heat exchanger is still in the cooling adjustment process, and at this time, the cooling adjustment of the heat exchanger is continued, so that the temperature of the heat exchanger is continuously decreased.
If the temperature of the heat exchanger detected by the temperature sensor corresponding to the heat exchanger is within the first preset temperature interval, the temperature of the heat exchanger reaches the optimal frosting temperature. And when the temperature of the heat exchanger is reduced, the thickness of frost condensed on the outer surface of the heat exchanger is gradually increased along with the extension of the heat exchange time, the air quantity of the natural convection type air conditioner is gradually reduced due to the increase of the thickness of the frost, the heat exchange quantity of the heat exchanger is reduced, and at the moment, the temperature of the refrigerating airflow is continuously reduced until the difference between the temperature of the refrigerating airflow and the temperature of the heat exchanger is smaller than or equal to a first preset difference.
Above-mentioned embodiment is through setting up temperature sensor in the natural convection type air conditioner to utilize temperature sensor to monitor the temperature of natural convection type air conditioner, can make the heat exchanger carry out automated regulation, and then make the natural convection type air conditioner more intelligent, regulate and control more accurately.
In another embodiment, it is also possible to use the calculated time during which the heat exchanger is working for controlling the regulation process. Referring to fig. 3, fig. 3 is a schematic flow chart illustrating a first heat preservation operation performed on a heat exchanger according to another embodiment of the present application. In this embodiment, the step of performing the first temperature keeping operation on the heat exchanger so that the difference between the temperature of the refrigerant airflow and the first preset temperature is smaller than or equal to the first preset difference comprises:
step S301: and acquiring first preset time and second preset time.
Specifically, the first preset time and the second preset time may be preset within the natural convection type air conditioner. Because under the condition that the structure and the heat exchange efficiency of the air conditioner are fixed, the time for cooling the heat exchanger to reach the first preset temperature in a certain range can be obtained through experimental analysis, and the time is set as the first preset time. And the time for which the heat exchanger is kept warm so that the difference between the temperature of the refrigerant gas flow and the first preset temperature is less than or equal to the first preset difference can be obtained through experimental analysis, and the time is set as the second preset time.
Step S302: and carrying out first heat preservation operation on the heat exchanger between the first preset time and the second preset time.
In step S302, when the natural convection type air conditioner enters the cooling mode, the natural convection type air conditioner first performs cooling adjustment on the heat exchanger, and simultaneously records the time of the heat exchanger operation. Before the time for detecting the work of the heat exchanger is equal to the first preset time, the heat exchanger is in a cooling adjusting process, and the temperature of the heat exchanger is continuously reduced. When the working time of the heat exchanger is equal to the first preset time, the cooling adjustment process of the heat exchanger is completed, first heat preservation operation is carried out on the heat exchanger between the first preset time and the second preset time so that the temperature of the heat exchanger is kept unchanged, and the heat preservation time of the heat exchanger is equal to the difference value between the second preset time and the second preset time.
In this embodiment, a ratio of the first preset time to the second preset time may be set to 1: 3. Experiments prove that when the ratio of the first preset time to the second preset time is 1:3, a better refrigerating effect can be obtained. In other optional embodiments, the ratio between the first preset time and the second preset time may also be set to be 1:2, 2:5, and the like, and the embodiment of the present application is not particularly limited.
According to the embodiment, the cooling adjusting time and the heat preservation adjusting time of the heat exchanger are preset in the natural convection type air conditioner, so that the structural complexity and the control complexity of the natural convection type air conditioner can be reduced, and the production cost of the natural convection type air conditioner is further reduced.
Further, in this embodiment, before the temperature-raising adjustment is completed and the temperature-lowering adjustment is started, the heat exchanger is further subjected to a second temperature-keeping operation, so that a difference between the temperature of the refrigerant airflow and a second preset temperature is greater than or equal to a second preset difference.
In particular, when the difference between the temperature of the refrigerating air flow and the temperature of the heat exchanger is greater than or equal to a second preset difference, it is indicated that the frost condensed on the outer surface of the heat exchanger has substantially completely dissolved. The second preset difference value may be obtained through experimental analysis or set according to experience, and is not specifically limited in the present application.
In this embodiment, the second preset difference may be set to be greater than or equal to 2 ℃ and less than or equal to 5 ℃. For example, the second predetermined difference may be 2 ℃, 2.5 ℃, 3 ℃, 3.5 ℃, 4 ℃, 4.5 ℃ or 5 ℃ or the like.
In some embodiments, the conditioning process may be controlled by sensing the temperature of the heat exchanger and the temperature of the refrigerant gas stream. Specifically, please refer to fig. 4, fig. 4 is a schematic flow chart illustrating a second heat-preserving operation performed on a heat exchanger according to an embodiment of the present disclosure. In this embodiment, the step of performing the second keeping warm operation on the heat exchanger so that the difference between the temperature of the refrigerant gas flow and the second preset temperature is greater than or equal to the second preset difference comprises:
step S401: the temperature of the heat exchanger and the temperature of the refrigerant gas flow are obtained.
Specifically, a temperature sensor corresponding to the heat exchanger and a temperature sensor corresponding to the air outlet are provided inside the natural convection type air conditioner, the temperature sensor corresponding to the heat exchanger is used for detecting the temperature of the heat exchanger, and the temperature sensor corresponding to the air outlet is used for detecting the temperature of the refrigerating air flow.
In some embodiments, the natural convection type air conditioner may obtain the temperature of the heat exchanger and the temperature of the cooling air flow in real time, so that the detection result is more accurate. In another embodiment, the natural convection type air conditioner may also periodically detect the temperature of the heat exchanger and the temperature of the refrigerant air flow at a predetermined frequency, and the embodiment of the present application is not particularly limited.
Step S402: and responding to the temperature of the heat exchanger in a second preset temperature interval, and carrying out second heat preservation operation on the heat exchanger until the difference value between the obtained temperature of the refrigerating airflow and the second preset temperature is larger than or equal to the second preset difference value.
In step S402, if the temperature of the heat exchanger detected by the temperature sensor corresponding to the heat exchanger is not in the second preset temperature interval, it indicates that the temperature of the heat exchanger has not reached the optimal defrosting temperature, which indicates that the heat exchanger is still in the temperature-raising adjusting process, and at this time, the temperature-raising adjustment of the heat exchanger is continued, so that the temperature of the heat exchanger continues to be raised.
And if the temperature of the heat exchanger detected by the temperature sensor corresponding to the heat exchanger is in the second preset temperature interval, the temperature of the heat exchanger reaches the optimal defrosting temperature. And when the temperature rise adjustment process of the heat exchanger is finished, keeping the temperature of the heat exchanger unchanged, gradually melting the frost condensed on the outer surface of the heat exchanger along with the extension of the heat exchange time, gradually reducing the thickness of the frost to gradually increase the air volume of the natural convection type air conditioner, increasing the heat exchange volume of the heat exchanger, and continuously increasing the temperature of the refrigerating airflow until the difference between the temperature of the refrigerating airflow and the temperature of the heat exchanger is greater than or equal to a second preset temperature.
Above-mentioned embodiment is through setting up temperature sensor in the natural convection type air conditioner to utilize temperature sensor to monitor the temperature of natural convection type air conditioner, can make the heat exchanger carry out automated regulation, and then make the natural convection type air conditioner more intelligent, regulate and control more accurately.
In another embodiment, it is also possible to use the calculated time during which the heat exchanger is working for controlling the regulation process. Referring to fig. 5, fig. 5 is a schematic flow chart illustrating a second heat-preserving operation performed on a heat exchanger according to another embodiment of the present application. In this embodiment, the step of performing the second keeping warm operation on the heat exchanger so that the difference between the temperature of the refrigerant airflow and the second preset temperature is greater than or equal to a second preset difference comprises:
step S501: and acquiring third preset time and fourth preset time.
Specifically, the third preset time and the fourth preset time may be preset within the natural convection type air conditioner. Under the condition that the structure and the heat exchange efficiency of the air conditioner are fixed, the time for the heat exchanger to heat from the first preset temperature to the second preset temperature in a certain range can be obtained through experimental analysis, and the time is set as the third preset time. And the time for which the heat exchanger is kept warm so that the difference between the temperature of the refrigerant gas flow and the second preset temperature is greater than or equal to the second preset difference can be obtained through experimental analysis, and the time is set as the fourth preset time.
Step S502: and carrying out second heat preservation operation on the heat exchanger between the third preset time and the fourth preset time.
In step S502, when the heat exchanger of the natural convection type air conditioner needs to be defrosted, the natural convection type air conditioner first performs temperature rise adjustment on the heat exchanger, and simultaneously records the time of temperature rise operation of the heat exchanger. And before the detected working time of the heat exchanger is equal to the third preset time, the heat exchanger is in a temperature rise adjusting process, and the temperature of the heat exchanger is continuously increased. And when the working time of the heat exchanger is equal to the third preset time, the temperature rise adjusting process of the heat exchanger is completed, and second heat preservation operation is carried out on the heat exchanger between the third preset time and the fourth preset time so as to keep the temperature of the heat exchanger unchanged, wherein the heat preservation time length is equal to the difference value between the fourth preset time and the third preset time.
In this embodiment, the ratio between the third preset time and the fourth preset time may be set to be 1: 3. Experiments prove that when the ratio of the third preset time to the fourth preset time is 1:3, a better refrigerating effect can be obtained. In other optional embodiments, the ratio between the third preset time and the fourth preset time may also be set to be 1:2, 2:5, and the like, and the embodiment of the present application is not particularly limited.
According to the embodiment, the temperature rise adjusting time and the heat preservation adjusting time of the heat exchanger are preset in the natural convection type air conditioner, so that the structural complexity and the control complexity of the natural convection type air conditioner can be reduced, and the production cost of the natural convection type air conditioner is further reduced.
In a specific application scenario, a refrigeration control method in the present application is described in detail by taking a manner of controlling an operating frequency of a compressor as an example. Referring to fig. 6 and 7, fig. 6 is a schematic flowchart illustrating a specific flow of a refrigeration control method according to an embodiment of the present application, and fig. 7 is a diagram illustrating an effect of controlling a natural convection type air conditioner by using the refrigeration control method in fig. 6. The natural convection type air conditioner is internally and preliminarily provided with a first preset temperature, a second preset temperature, a first preset difference value and a second preset difference value, wherein the first preset temperature is-5 ℃, the second preset temperature is 5 ℃, the first temperature tolerance is 0 ℃, the second temperature tolerance is 0 ℃, the first preset difference value is more than or equal to 0 ℃ and less than or equal to 3 ℃, and the second preset difference value is more than or equal to 2 ℃ and less than or equal to 5 ℃. The refrigeration control method of the natural convection type air conditioner specifically comprises the following steps:
firstly, when the time is 0min, the natural convection type air conditioner receives a refrigeration instruction and responds to the refrigeration instruction of a user to enter a refrigeration mode. And when the temperature of the heat exchanger reaches below 0 ℃, the subzero temperature enables the outer surface of the heat exchanger to start frosting. And when the operation is carried out for 5min, the temperature of the heat exchanger reaches the first preset temperature of-5 ℃, the temperature of the heat exchanger is positioned in the first preset temperature range, and the temperature reduction and adjustment of the heat exchanger are finished. At this time, the heat exchanger is subjected to a first heat-retaining operation, and the temperature of the heat exchanger is maintained constant while maintaining the frequency of the compressor constant. Within 5-15 min, the thickness of frost condensed on the outer surface of the heat exchanger is gradually increased along with the extension of the heat exchange time, the air quantity of the natural convection type air conditioner is gradually reduced due to the increase of the thickness of the frost, the heat exchange quantity of the heat exchanger is reduced, at the moment, the temperature of the refrigerating airflow is continuously reduced, when the temperature of the refrigerating airflow is detected to be reduced to-4 ℃, the temperature difference between the refrigerating airflow and the heat exchanger is 1 ℃, the frosting process is completed within a first preset difference range.
And then, heating and adjusting the heat exchanger at 15-20 min, and starting a defrosting process. The frequency of the compressor connected to the heat exchanger is reduced so that the circulation amount of the refrigerant flowing through the heat exchanger is reduced, the temperature of the heat exchanger is gradually increased, the temperature of the refrigerant gas flow is gradually increased, and when the temperature of the heat exchanger reaches above 0 ℃, the above-zero temperature causes the frost condensed on the outer surface of the heat exchanger to start melting. And when the operation is carried out for 20min, the temperature of the heat exchanger reaches the second preset temperature of 5 ℃, the temperature of the heat exchanger is positioned in the second preset temperature range, and the temperature rise adjustment of the heat exchanger is finished. At this time, the heat exchanger is subjected to a second heat-preserving operation, the frequency of the compressor is maintained constant, and the temperature of the heat exchanger is maintained constant. Within 20min-30min, the thickness of the frost layer is gradually reduced along with the extension of the heat exchange time, so that the air volume of the natural convection type air conditioner is gradually reduced, the heat exchange quantity of the heat exchanger is reduced, at the moment, the temperature of the refrigerating airflow is continuously increased, when the temperature of the refrigerating airflow detected by the temperature sensor is increased to 7 ℃, the temperature difference between the refrigerating airflow and the heat exchanger is 2 ℃, and the defrosting process is completed within a second preset difference range.
The refrigeration is performed by the circulation reciprocating.
Referring to fig. 8, fig. 8 is a schematic structural diagram of an embodiment of a storage medium provided in the present application. The storage medium 10 has stored thereon program data 11, and the program data 11, when executed by a processor, is used to implement the cooling control method in the above-described embodiment.
The program data 11 may be stored in a storage medium 10 in the form of a software product including instructions for causing a natural convection air conditioner or processor to perform all or part of the steps of the method described in the various embodiments of the present application.
The storage medium 10 is a medium in computer memory for storing some discrete physical quantity. And the aforementioned storage medium 10 having a storage function includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, an optical disk, or other various media capable of storing the program data 11 codes.
Referring to fig. 9, fig. 9 is a schematic structural diagram of an embodiment of a natural convection type air conditioner provided in the present application. The natural convection type air conditioner 20 includes a processor 22 and a memory 24 connected to each other, and the memory 24 stores a computer program, and when the processor 22 executes the computer program, the cooling control method as described above is implemented.
The processor 22 may also be referred to as a CPU (Central Processing Unit). The processor 22 may be an integrated circuit chip having signal processing capabilities. The processor 22 may also be a general purpose processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
Be different from prior art's condition, this application embodiment is through cooling down the regulation and the regulation of rising temperature to the heat exchanger to make the temperature of heat exchanger below 0 ℃ and cyclic variation more than 0 ℃, can make the heat exchanger be in the process of frosting and defrosting always, and then make the heat exchanger and great with the difference in temperature between the air of heat exchanger contact, be convenient for carry out abundant heat transfer between heat exchanger and the air, and then strengthen the heat transfer effect of natural convection, promote the refrigeration performance of natural convection type air conditioner.
The above description is only an example of the present application and is not intended to limit the scope of the present application, and all modifications of equivalent structures and equivalent processes, which are made by the contents of the specification and the drawings, or which are directly or indirectly applied to other related technical fields, are intended to be included within the scope of the present application.
Claims (11)
1. A refrigeration control method of a natural convection type air conditioner, comprising:
responding to a refrigeration instruction of a user to enter a refrigeration mode;
in the refrigeration mode, the heat exchanger is subjected to cooling regulation and heating regulation in a circulating mode, so that air forms refrigeration airflow through natural convection under the action of temperature difference;
the temperature reduction adjustment comprises the step of gradually reducing the temperature of the heat exchanger to a first preset temperature interval;
the temperature rise regulation comprises the step of gradually raising the temperature of the heat exchanger from a first preset temperature interval to a second preset temperature interval, wherein the first preset temperature interval is lower than the frost point temperature, and the second preset temperature interval is higher than the frost point temperature;
the minimum value of the first preset temperature interval is equal to the first preset temperature minus a first temperature tolerance, and the maximum value of the first preset temperature interval is equal to the first preset temperature plus the first temperature tolerance; the minimum value of the second preset temperature interval is equal to the second preset temperature minus a second temperature tolerance, and the maximum value of the second preset temperature interval is equal to the second preset temperature plus the second temperature tolerance;
and further performing first heat preservation operation on the heat exchanger before the temperature reduction adjustment is completed and the temperature rise adjustment is started so as to keep the temperature of the heat exchanger unchanged, so that the difference between the temperature of the refrigerating airflow and the first preset temperature is smaller than or equal to a first preset difference.
2. The refrigeration control method according to claim 1, wherein the step of performing the temperature-lowering regulation and the temperature-raising regulation of the heat exchanger in a cyclic manner in the refrigeration mode includes:
and adjusting the temperature of the heat exchanger by adjusting the operating frequency of a compressor connected with the heat exchanger and/or the opening of a throttle valve on a refrigerant passage connected with the heat exchanger.
3. The refrigeration control method according to claim 1, wherein the temperature decrease adjustment causes frost to be formed on the surface of the heat exchanger, and the temperature increase adjustment causes the frost on the surface of the heat exchanger to melt to form flowing defrosting water.
4. The refrigeration control method as recited in claim 1 wherein the step of performing a first soak operation on the heat exchanger to maintain the temperature of the heat exchanger constant such that the difference between the temperature of the refrigerant gas stream and the first preset temperature is less than or equal to a first preset difference comprises:
acquiring the temperature of the heat exchanger and the temperature of the refrigerating airflow;
and responding to the temperature of the heat exchanger in the first preset temperature range, and performing first heat preservation operation on the heat exchanger until the difference between the obtained temperature of the refrigerating airflow and the first preset temperature is smaller than or equal to the first preset difference.
5. The refrigeration control method as recited in claim 1 wherein the step of performing a first soak operation on the heat exchanger to maintain the temperature of the heat exchanger constant such that the difference between the temperature of the refrigerant gas stream and the first preset temperature is less than or equal to a first preset difference comprises:
acquiring first preset time and second preset time;
and carrying out first heat preservation operation on the heat exchanger between the first preset time and the second preset time.
6. The refrigeration control method as recited in claim 1, wherein before the temperature-raising adjustment is completed and the temperature-lowering adjustment is started, the heat exchanger is further subjected to a second soak operation to make the temperature of the heat exchanger constant, so that the difference between the temperature of the refrigerant gas flow and the second preset temperature is greater than or equal to a second preset difference.
7. The refrigeration control method as recited in claim 6 wherein the step of performing a second soak operation on the heat exchanger to maintain the temperature of the heat exchanger constant such that the difference between the temperature of the refrigerant gas stream and the second predetermined temperature is greater than or equal to a second predetermined difference comprises:
acquiring the temperature of the heat exchanger and the temperature of the refrigerating airflow;
and responding to the temperature of the heat exchanger in the second preset temperature interval, and carrying out second heat preservation operation on the heat exchanger until the difference between the obtained temperature of the refrigerating airflow and the second preset temperature is larger than or equal to the second preset difference.
8. The refrigeration control method as recited in claim 6 wherein the step of performing a second soak operation on the heat exchanger to maintain the temperature of the heat exchanger constant such that the difference between the temperature of the refrigerant gas stream and the second predetermined temperature is greater than or equal to a second predetermined difference comprises:
acquiring third preset time and fourth preset time;
and carrying out second heat preservation operation on the heat exchanger between the third preset time and the fourth preset time.
9. The refrigeration control method according to claim 6, wherein the first preset temperature is equal to or higher than-5 ℃ and equal to or lower than-2 ℃, the second preset temperature is equal to or higher than 2 ℃ and equal to or lower than 5 ℃, the first preset difference is equal to or higher than 0 ℃ and equal to or lower than 3 ℃, and the second preset difference is equal to or higher than 2 ℃ and equal to or lower than 5 ℃.
10. A natural convection type air conditioner comprising a processor and a memory connected to each other, the memory storing a computer program, the processor implementing the steps of the refrigeration control method according to any one of claims 1 to 9 when executing the computer program.
11. A storage medium having stored thereon program data, the program data being adapted to, when executed by a processor, carry out the steps of a refrigeration control method according to any one of claims 1 to 9.
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Effective date of registration: 20220415 Address after: No.22, Lingang Road, Beijiao Town, Shunde District, Foshan City, Guangdong Province Applicant after: GD MIDEA AIR-CONDITIONING EQUIPMENT Co.,Ltd. Applicant after: GUANGDONG MEIDI WHITE HOUSEHOLD ELECTRICAL APPLIANCE TECHNOLOGY INNOVATION CENTER Co.,Ltd. Applicant after: MIDEA GROUP Co.,Ltd. Address before: 528311 4 Global Innovation Center, industrial road, Beijiao Town, Shunde District, Foshan, Guangdong, China Applicant before: GUANGDONG MEIDI WHITE HOUSEHOLD ELECTRICAL APPLIANCE TECHNOLOGY INNOVATION CENTER Co.,Ltd. Applicant before: Midea Group Co., Ltd |
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