CN115234981A - Air conditioner - Google Patents

Air conditioner Download PDF

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Publication number
CN115234981A
CN115234981A CN202210783190.3A CN202210783190A CN115234981A CN 115234981 A CN115234981 A CN 115234981A CN 202210783190 A CN202210783190 A CN 202210783190A CN 115234981 A CN115234981 A CN 115234981A
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CN
China
Prior art keywords
air
heat exchanger
indoor
outdoor
auxiliary heat
Prior art date
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Granted
Application number
CN202210783190.3A
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Chinese (zh)
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CN115234981B (en
Inventor
朱海滨
张东立
都学敏
杨远强
牛世波
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Qingdao Hisense Hitachi Air Conditioning System Co Ltd
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Qingdao Hisense Hitachi Air Conditioning System Co Ltd
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Priority to CN202210783190.3A priority Critical patent/CN115234981B/en
Publication of CN115234981A publication Critical patent/CN115234981A/en
Application granted granted Critical
Publication of CN115234981B publication Critical patent/CN115234981B/en
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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
    • F24F1/0038—Indoor units, e.g. fan coil units characterised by introduction of outside air to the room in combination with simultaneous exhaustion of inside air
    • 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
    • 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
    • F24F1/0083—Indoor units, e.g. fan coil units with dehumidification means
    • 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
    • F24F11/42—Defrosting; Preventing freezing of outdoor units
    • 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
    • F24F11/62—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
    • 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]
    • Y02B30/56—Heat recovery units

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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 discloses an air conditioning device, wherein an indoor heat exchanger and a first auxiliary heat exchanger are arranged in an indoor air supply duct, an outdoor heat exchanger and a second auxiliary heat exchanger are arranged in an outdoor air exhaust duct, a dehumidifying rotating wheel comprises a dehumidifying area and a regenerating area, one of the dehumidifying area and the regenerating area is positioned in the indoor air supply duct and is positioned at the air outlet side of the first auxiliary heat exchanger and the air inlet side of the indoor heat exchanger, the other one of the dehumidifying area and the regenerating area is positioned in the outdoor air exhaust duct and is positioned at the air outlet side of the second auxiliary heat exchanger and the air inlet side of the outdoor heat exchanger, during heating, the first auxiliary heat exchanger is used as a condenser, the second auxiliary heat exchanger is used as an evaporator, and the part of the dehumidifying rotating wheel positioned in the outdoor air exhaust duct is the dehumidifying area and the part of the dehumidifying rotating wheel positioned in the indoor air supply duct is the regenerating area. The dehumidification rotating wheel is used for absorbing moisture of outdoor air so as to prevent an outdoor evaporator from frosting when the air conditioner heats in winter, and meanwhile, the dehumidification rotating wheel releases the collected moisture and sends the moisture into a room together with outdoor fresh air or indoor return air, so that humidification is realized.

Description

Air conditioner
Technical Field
The invention relates to the technical field of air conditioners, in particular to an air conditioner which can deeply dehumidify in summer and can operate without frost in winter.
Background
When the air conditioner executes a heating mode in winter, the outdoor heat exchanger is used as an evaporator, the indoor heat exchanger is used as a condenser, and the surface of the air conditioner is easy to frost when the evaporation temperature is lower than 0 ℃, so that the heating effect of the air conditioner is seriously influenced by the thickening of a frost layer. The common defrosting mode among the prior art is for defrosting through refrigerating system's switching-over, and the defrosting process needs to utilize the heat of indoor set, consequently because indoor heat exchanger is cold after changing the frost, has short strong cold wind sense, reduces user and uses experience.
The above information disclosed in this background section is only for enhancement of understanding of the background of the application and therefore it may comprise prior art that does not constitute known to a person of ordinary skill in the art.
Disclosure of Invention
The invention provides an air conditioning device, which is characterized in that a dehumidification rotating wheel is used for absorbing moisture of outdoor air so as to ensure that the moisture content of the air entering an outdoor evaporator is extremely low during heating of an air conditioner in winter and avoid frosting of the outdoor evaporator, and meanwhile, the dehumidification rotating wheel releases the collected moisture and sends the moisture into a room along with outdoor fresh air or indoor return air so as to realize humidification.
In order to realize the purpose of the invention, the invention is realized by adopting the following technical scheme:
an air conditioner is composed of indoor air supply channel for circulating indoor air and/or fresh outdoor air, outdoor air exhaust channel for exhausting air, indoor heat exchanger and the first auxiliary heat exchanger in said air supply channel, outdoor heat exchanger and the second auxiliary heat exchanger in said air exhaust channel, and rotary wheel consisting of dehumidifying region and regenerating region.
The dehumidification rotating wheel is used for absorbing moisture of outdoor air so as to ensure that the moisture content of the air entering the outdoor evaporator is extremely low when the air conditioner heats in winter, the outdoor evaporator is prevented from frosting, and meanwhile, the dehumidification rotating wheel releases the collected moisture and sends the moisture into the room along with outdoor fresh air or indoor return air, so that humidification is realized.
In some embodiments of the present application, the indoor supply air duct includes a first air duct and a second air duct;
one end of the first air duct is provided with an indoor air return inlet, the other end of the first air duct is provided with an outdoor fresh air first inlet, and a first air valve used for dividing the first air duct into an indoor first air duct and an outdoor first air duct is arranged in the first air duct;
one end of the second air duct is provided with an indoor air supply outlet, the other end of the second air duct is provided with the outdoor fresh air first inlet, and a second air valve used for dividing the second air duct into an indoor second air duct and an outdoor second air duct is arranged in the second air duct;
the outdoor first air duct and the outdoor second air duct are communicated at one end close to the outdoor fresh air first inlet;
the first auxiliary heat exchanger and a part of the dehumidification rotating wheel are arranged in the outdoor second air channel, and the indoor heat exchanger is arranged in the indoor second air channel.
In some embodiments of the present application, the first air valve is a switchable air valve, and a third air valve is disposed at a position, close to the first air valve, of the outdoor first air duct;
when the first air valve is in a vertical state, the indoor first air channel is isolated from the outdoor first air channel, and the indoor first air channel is communicated with the indoor second air channel;
the first air valve is in a horizontal state, when the third air valve is opened, the indoor first air channel is communicated with the outdoor first air channel, and the indoor first air channel is isolated from the indoor second air channel;
the first air valve is in an inclined state, when the third air valve is closed, the indoor first air channel is isolated from the outdoor first air channel, the indoor first air channel is communicated with the indoor second air channel, and the air return quantity is adjusted by adjusting the opening angle of the first air valve.
In some embodiments of the present application, a compressor, a four-way reversing valve, the outdoor heat exchanger, the second auxiliary heat exchanger, the first auxiliary heat exchanger, and the indoor heat exchanger are sequentially connected to form a heat exchange loop of an air conditioning device;
a first throttling element is arranged on a pipeline between the indoor heat exchanger and the first auxiliary heat exchanger;
the liquid pipe end of the second auxiliary heat exchanger is connected with the first branch and the second branch;
the first branch is connected with the first auxiliary heat exchanger, and a second throttling element is arranged on the first branch;
the second branch is connected to the end of the gas pipe of the first auxiliary heat exchanger, and a first electromagnetic valve is arranged on the second branch;
and the air pipe end of the first auxiliary heat exchanger is connected to the inlet of the compressor through a third branch, and the third branch is provided with an electromagnetic valve.
In some embodiments of the present application, the air conditioning device has an internal circulation refrigeration deep dehumidification mode and an internal circulation refrigeration normal dehumidification mode;
in the internal circulation refrigeration deep dehumidification mode, the first auxiliary heat exchanger is used as an evaporator, the second auxiliary heat exchanger is used as a condenser, the part of the dehumidification rotating wheel, which is positioned in the outdoor second air channel, is an adsorption area, and indoor return air sequentially flows through the indoor return air inlet, the first air channel, the first auxiliary heat exchanger, the dehumidification rotating wheel, the second air channel and the indoor heat exchanger to the indoor air supply outlet;
in the internal circulation refrigeration common dehumidification mode, the first auxiliary heat exchanger and the dehumidification rotary wheel are closed, the second auxiliary heat exchanger is used as a condenser, and indoor return air sequentially flows through the indoor return air inlet, the indoor first air duct, the indoor second air duct, the indoor heat exchanger and the indoor air supply outlet.
In some embodiments of the present application, when dsa1 is not greater than dset-nq/ρ G, the air conditioning apparatus executes the internal circulation refrigeration normal dehumidification mode, otherwise executes the internal circulation refrigeration deep dehumidification mode, wherein dsa1 is a moisture content at an indoor air supply port, dset is a moisture content of indoor air, n is an indoor number of people, q is a human body moisture content, ρ is an air density, and G is an air supply amount.
In some embodiments of the application, when the air conditioning device executes the internal circulation refrigeration normal dehumidification mode, if dsa1 is detected to be larger than or equal to dset-nq/ρ G + alpha, alpha is a set constant, the compressor is increased in frequency, then the system judges once at intervals, and when the frequency of the compressor is increased to Fmax and dsa1 is larger than or equal to dset-nq/ρ G + alpha, the air conditioning device is switched into the internal circulation refrigeration deep dehumidification mode;
when the air conditioning device executes the internal circulation refrigeration deep dehumidification mode, the system judges that dsa1 is less than or equal to dset-nq/rho G-beta, beta is a set constant, and if the dsa1 is less than or equal to dset-nq/rho G-beta, the system maintains the current state; if not, the compressor is upscaled and the first throttling element is turned down.
In some embodiments of the present application, the air conditioning apparatus has a fresh air cooling and dehumidifying mode, the first auxiliary heat exchanger serves as an evaporator, the second auxiliary heat exchanger serves as a condenser, and a portion of the dehumidifying wheel located in the outdoor second air duct is an adsorption region;
the first throttling element and the second throttling element perform throttling decompression, and the first electromagnetic valve and the second electromagnetic valve are opened;
the indoor air return inlet and the first air valve are closed, and outdoor fresh air sequentially flows through the first outdoor fresh air inlet, the first auxiliary heat exchanger, the dehumidification rotating wheel, the second air channel and the indoor heat exchanger to the indoor air supply outlet.
In some embodiments of the present application, when the air conditioning apparatus executes the fresh air cooling and dehumidifying mode, the system determines a relationship between a current outdoor moisture content dout and an indoor required moisture content dsa2, where dsa2= dset-q/ρ Gr, dset is the moisture content of indoor air, q is a human body moisture content, ρ is an air density, and Gr is a fresh air volume required by each indoor person;
if dout-dsa2 is less than m, and m is a set constant, the dehumidifying rotating wheel is closed, otherwise, the dehumidifying rotating wheel is opened;
and after the dehumidification rotating wheel is closed, the system judges once every a period of time, if dsa2 is not more than dset-gamma and gamma is a set constant, the current state is maintained, otherwise, the compressor is increased in frequency, when the compressor is increased in frequency to Fmax and dsa2 is more than dset-q/rho Gr, the dehumidification rotating wheel is opened, the first air valve moves to an inclined state, and indoor return air and outdoor fresh air are mixed.
In some embodiments of the present application, when an air conditioning apparatus performs heating, it is determined whether there is a risk of frosting in the outdoor heat exchanger through a relationship between a liquid pipe refrigerant temperature of the outdoor heat exchanger and a dew point temperature of an air inlet side of the outdoor heat exchanger, and it is determined whether there is a risk of frosting in the second auxiliary heat exchanger through a relationship between a liquid pipe refrigerant temperature of the second auxiliary heat exchanger and a dew point temperature of an air inlet side of the second auxiliary heat exchanger;
if the outdoor heat exchanger and/or the second auxiliary heat exchanger has a frosting risk, the first electromagnetic valve is opened, the second throttling element is closed, a third throttling element is arranged on a pipeline between the outdoor heat exchanger and the second auxiliary heat exchanger, throttling depressurization is carried out by the third throttling element, the second auxiliary heat exchanger serves as a condenser and operates for a period of time until the frosting risk of the outdoor heat exchanger and/or the second auxiliary heat exchanger is eliminated, and then the second auxiliary heat exchanger is switched to an evaporator state.
Compared with the prior art, the invention has the advantages and positive effects that:
in summer dehumidification, the air supply moisture content of the fresh air is controlled by an optimization control method, so that the fresh air bears all latent heat loads;
the fresh air or the indoor air can be humidified by utilizing the moisture in the outdoor air in winter, and throttling elements at different positions can be controlled to act according to different modes, so that different effects are realized;
when the heating operation is carried out in winter, the frosting of the outdoor heat exchanger can be prevented by adjusting the state of the second auxiliary heat exchanger and optimizing the control method, so that the continuous heating operation without frosting is realized.
Other features and advantages of the present invention will become more apparent from the following detailed description of the invention when taken in conjunction with the accompanying drawings.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural view of an air conditioning apparatus according to an embodiment;
FIG. 2 is a schematic view of an air path of the air conditioner according to the embodiment during the internal circulation of the indoor air;
FIG. 3 is a schematic diagram of an air path of the air conditioner according to the embodiment during deep internal circulation of indoor air;
FIG. 4 is a schematic diagram of an air path of the air conditioner according to the embodiment during fresh air;
FIG. 5 is a schematic diagram of an air path of the air conditioning apparatus according to the embodiment during air mixing;
fig. 6 is a diagram illustrating the switching of relevant components of the air conditioning apparatus according to the embodiment in each cooling mode in summer;
fig. 7 is a diagram illustrating switching of relevant components of the air conditioner in each heating mode in winter according to the embodiment;
fig. 8 is a control method of the air conditioner according to the embodiment under the circulation of normal dehumidification and deep dehumidification in summer;
FIG. 9 is a control method of an air conditioning apparatus in a summer fresh air dehumidification mode according to an embodiment;
fig. 10 is a control method of an air conditioner according to an embodiment when heating and frost formation are prevented in winter;
reference numerals:
01-indoor air return opening, 02-indoor air supply opening, 03-outdoor fresh air first inlet, 04-outdoor fresh air second inlet, 05-outdoor air outlet, 06-indoor air supply duct, 61-first air duct, 611-indoor first air duct, 612-outdoor first air duct, 62-second air duct, 621-indoor second air duct, 622-outdoor second air duct, 07-outdoor air exhaust duct, 71-outdoor air exhaust upper air duct, 72-outdoor air exhaust lower air duct, 08-first air valve, 09-second air valve, 10-third air valve, 11-compressor, 12-four-way reversing valve, 13-outdoor heat exchanger, 14-indoor heat exchanger, 15-first auxiliary heat exchanger, 16-second auxiliary heat exchanger, 17-first throttling element, 18-second throttling element, 19-third throttling element, 20-first electromagnetic valve, 21-second electromagnetic valve, 22-first branch, 23-second branch, 24-third branch, 25-first temperature and humidity sensor, 26-second temperature sensor, 27-temperature sensor, 29-temperature sensor, 30-humidity sensor, 29-temperature sensor, 30-temperature sensor, and dehumidification sensor.
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.
In the description of the present application, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the referred device or element must have a particular orientation, be constructed in a particular orientation, and be operated, and thus should not be construed as limiting the present application.
The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, the meaning of "a plurality" is two or more unless otherwise specified.
In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in this application will be understood to be a specific case for those of ordinary skill in the art.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature "on," "above" and "over" the second feature may include the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
The following disclosure provides many different embodiments or examples for implementing different features of the invention. To simplify the disclosure of the present invention, the components and arrangements of specific examples are described below. Of course, they are merely examples and are not intended to limit the present invention. Moreover, the present invention may repeat reference numerals and/or reference letters in the various examples, which have been repeated for purposes of simplicity and clarity and do not in themselves dictate a relationship between the various embodiments and/or configurations discussed. In addition, the present invention provides examples of various specific processes and materials, but one of ordinary skill in the art may recognize applications of other processes and/or uses of other materials.
The air conditioner performs a refrigeration cycle of the air conditioner by using a compressor, a condenser, an expansion valve, and an evaporator. The refrigeration cycle includes a series of processes involving compression, condensation, expansion, and evaporation to cool or heat an indoor space.
The low-temperature and low-pressure refrigerant enters the compressor, the compressor compresses the refrigerant gas in a high-temperature and high-pressure state, and the compressed refrigerant gas is discharged. The discharged refrigerant gas flows into the condenser. The condenser condenses the compressed refrigerant into a liquid phase, and heat is released to the surrounding environment through the condensation process.
The expansion valve expands the high-temperature and high-pressure liquid-phase refrigerant condensed in the condenser into a low-pressure liquid-phase refrigerant. The evaporator evaporates the refrigerant expanded in the expansion valve, and returns the refrigerant gas in a low-temperature and low-pressure state to the compressor. The evaporator can achieve a cooling effect by heat-exchanging with a material to be cooled using latent heat of evaporation of a refrigerant. The air conditioner can adjust the temperature of the indoor space throughout the cycle.
The outdoor unit of the air conditioner refers to a portion of a refrigeration cycle including a compressor and an outdoor heat exchanger, the indoor unit of the air conditioner includes an indoor heat exchanger, and an expansion valve may be provided in the indoor unit or the outdoor unit.
The indoor heat exchanger and the outdoor heat exchanger serve as a condenser or an evaporator. When the indoor heat exchanger serves as a condenser, the air conditioner performs a heating mode; when the indoor heat exchanger is used as an evaporator, the air conditioner performs a cooling mode.
The indoor heat exchanger and the outdoor heat exchanger are switched to be used as a condenser or an evaporator, a four-way valve is generally adopted, and specific reference is made to the arrangement of a conventional air conditioner, which is not described herein again.
The refrigeration working principle of the air conditioner is as follows: the compressor works to enable the interior of the indoor heat exchanger (in the indoor unit, the evaporator at the moment) to be in an ultralow pressure state, liquid refrigerant in the indoor heat exchanger is rapidly evaporated to absorb heat, air blown out by the indoor fan is cooled by the coil pipe of the indoor heat exchanger to become cold air to be blown into a room, the evaporated and vaporized refrigerant is compressed by the compressor, is condensed into liquid in a high-pressure environment in the outdoor heat exchanger (in the outdoor unit, the condenser at the moment) to release heat, and the heat is dissipated into the atmosphere through the outdoor fan, so that the refrigeration effect is achieved by circulation.
The heating working principle of the air conditioner is as follows: the gaseous refrigerant is pressurized by the compressor to become high-temperature and high-pressure gas, and the high-temperature and high-pressure gas enters the indoor heat exchanger (the condenser at the moment), is condensed, liquefied and released heat to become liquid, and simultaneously heats indoor air, so that the aim of increasing the indoor temperature is fulfilled. The liquid refrigerant is decompressed by the throttling device, enters the outdoor heat exchanger (an evaporator at the moment), is evaporated, gasified and absorbs heat to form gas, absorbs heat of outdoor air (the outdoor air becomes cooler) to form gaseous refrigerant, and enters the compressor again to start the next cycle.
Referring to fig. 1, the air conditioning apparatus in the present application includes an indoor supply air duct 06 and an outdoor exhaust air duct 07. The indoor air supply duct 06 is used for indoor internal circulation return air and/or outdoor fresh air supply, namely, the indoor air supply duct 06 can realize indoor air circulation and outdoor fresh air introduction as required. The outdoor exhaust duct 07 is used for outdoor exhaust and performs heat exchange with an outdoor heat exchanger 13 provided in the outdoor exhaust duct 07.
An indoor heat exchanger 14, a first auxiliary heat exchanger 15, and a blower 29 are provided in the indoor air supply duct 06, and an outdoor heat exchanger 13, a second auxiliary heat exchanger 16, and a blower 30 are provided in the outdoor air discharge duct 07.
The compressor 11, the four-way reversing valve 12, the throttling element, the outdoor heat exchanger 13, the second auxiliary heat exchanger 16, the first auxiliary heat exchanger 15 and the indoor heat exchanger 14 are sequentially connected to form a heat exchange loop of the air conditioning device, the throttling element is arranged on different pipeline positions as required, and plays different roles in different operation modes, and details are described below.
The air conditioning apparatus further includes a desiccant rotor 31 including a desiccant region and a regeneration region, one of the desiccant region and the regeneration region being located in the indoor supply air duct 06 and located on the air outlet side of the first auxiliary heat exchanger 15 and the air inlet side of the indoor heat exchanger 14, and the other being located in the outdoor exhaust air duct 07 and located on the air outlet side of the second auxiliary heat exchanger 16 and the air inlet side of the outdoor heat exchanger 13.
The desiccant rotor 31 is made of a moisture absorbent material, and in the desiccant region, when the temperature is lower than the reheat temperature, the desiccant rotor 31 can absorb moisture in the air; on the regeneration zone, the desiccant rotor 31 can release adsorbed moisture when the temperature is higher than the regeneration temperature.
It is understood that, as the desiccant rotor 31 rotates, the desiccant and regeneration areas circulate in the indoor supply air path 06 and the outdoor discharge air path 07.
When the air conditioner is used for heating in winter, the indoor heat exchanger 14 is used as a condenser, the outdoor heat exchanger 13 is used as an evaporator, and the surface of the outdoor heat exchanger 13 is easy to frost, so that the heat exchange efficiency of the air conditioner is influenced. This application is through adding the heat exchanger 16 is assisted to establish dehumidification runner 31 and second in outdoor heat exchanger 13's air inlet side, absorbs the moisture in the air, guarantees that the air that flows to outdoor heat exchanger 13 is dry low temperature air, has just so solved outdoor heat exchanger 13 and has frosted the problem easily winter. Specifically, the first auxiliary heat exchanger 15 serves as a condenser, the second auxiliary heat exchanger 16 serves as an evaporator, the portion of the dehumidifying rotor 31 located in the outdoor exhaust air duct 07 serves as a dehumidifying region, the portion of the dehumidifying rotor 31 located in the indoor air supply duct 06 serves as a regenerating region, outdoor air flows into the outdoor exhaust air duct 07 and flows through the second auxiliary heat exchanger 16, at this time, the second auxiliary heat exchanger 16 serves as an evaporator, the air temperature is reduced, the air passes through the adsorbing region of the dehumidifying rotor 31, the adsorbing region absorbs moisture in the air, the moisture content of the air is reduced, the air passes through the outdoor heat exchanger 13 to be cooled again, and finally the air is discharged out of the outdoor exhaust air duct 07.
The second auxiliary heat exchanger 16 pre-cools the outdoor air in winter, and the cooled air is changed into dry low-temperature air through the dehumidification rotating wheel 31, so that the possibility of frosting of the outdoor heat exchanger 13 is further reduced. The second auxiliary heat exchanger 16 is provided to prevent this from occurring because if the outdoor air is not so low in winter and is not pre-cooled by the second auxiliary heat exchanger 16, there is a possibility that frost may be generated by the outdoor heat exchanger 13 even if the air becomes dry by the desiccant rotor 31.
In the process, the first auxiliary heat exchanger 15 is used as a condenser, radiates heat, heats the dehumidifying rotating wheel 31 close to the first auxiliary heat exchanger, releases moisture in the regeneration area, and sends the moisture to the room along the indoor air supply duct 06 along with air flow, so as to achieve the purpose of indoor humidification.
When the air conditioning device heats in winter, the first auxiliary heat exchanger 15 is mainly used for preheating the air flowing through the dehumidifying rotating wheel 31 in the indoor air supply duct 06, so that the moisture in the regeneration area of the dehumidifying rotating wheel 31 is released, and indoor humidification is realized; the second auxiliary heat exchanger 16 mainly functions to pre-cool the air passing through the outdoor heat exchanger 13, and the auxiliary desiccant rotor 31 absorbs moisture to ensure that the air passing through the outdoor heat exchanger 13 is dry low-temperature air, so as to prevent the outdoor heat exchanger 13 from frosting during heating in winter.
The air conditioner in this application can realize heating simultaneously winter and prevent frosting and indoor humidification, can realize indoor dehumidification in summer, through carrying out optimal design to indoor air supply wind channel 06 and outdoor air exhaust wind channel 07, the layout of supplementary blast gate, throttling element and refrigerant pipeline, can realize that summer inner loop refrigeration is ordinary to be dehumidified, summer inner loop refrigeration degree of depth dehumidification, summer new trend refrigeration dehumidification, summer thoughtlessly wind refrigeration dehumidification, winter inner loop heats the humidification, winter new trend heats the humidification, winter thoughtlessly wind heats functions such as humidification, and, under each mode of heating in winter, can also effectively prevent frosting of outdoor heat exchanger 13 and second supplementary heat exchanger 16, realize air conditioner's the continuous heating operation of not frosting.
The air path design of the air conditioner of the present application is as follows with reference to fig. 1:
the indoor air supply duct 06 comprises a first duct 61 and a second duct 62, one end of the first duct 61 is provided with an indoor air return opening 01, the other end of the first duct 61 is provided with an outdoor fresh air first inlet 03, and a first air valve 08 used for dividing the first duct 61 into an indoor first duct 611 and an outdoor first duct 612 is arranged in the first duct 61.
One end of the second air duct 62 is provided with an indoor air supply outlet 02, the other end is provided with a first outdoor fresh air inlet 03, and a second air valve 09 for dividing the second air duct 62 into an indoor second air duct 621 and an outdoor second air duct 622 is arranged in the second air duct 62.
The outdoor first air duct 612 and the outdoor second air duct 622 are communicated at one end close to the first inlet 03 for fresh outdoor air, a first auxiliary heat exchanger 15 and a part of the desiccant rotor 31 are arranged in the outdoor second air duct 622, and an indoor heat exchanger 14 is arranged in the indoor second air duct 621.
The first air valve 08 is a switchable air valve, and the outdoor first air duct 612 is provided with a third air valve 10 at a position close to the first air valve 08.
When the first air valve 08 is in a vertical state, the indoor first air duct 611 is isolated from the outdoor first air duct 612, the indoor first air duct 611 is communicated with the indoor second air duct 621, referring to fig. 2, at the moment, indoor air can circulate indoors, the outdoor fresh air first inlet 03 is closed, the indoor air flows into the indoor first air duct 611 through the indoor air return opening 02 under the action of the air blower 29 and then flows into the indoor second air duct 621, and flows into the indoor air duct 621 again after passing through the indoor heat exchanger 14 to exchange heat, and then flows into the indoor air again through the indoor air supply opening 02 to achieve heating or cooling of the indoor air.
When the first air valve 08 is in a horizontal state and the third air valve 10 is opened, the indoor first air duct 611 is communicated with the outdoor first air duct 612, the indoor first air duct 611 is isolated from the indoor second air duct 621, referring to fig. 3, at this time, the indoor air can be subjected to deep indoor circulation, the outdoor fresh air first inlet 03 is closed, the indoor air passes through the indoor first air duct 611, the outdoor first air duct 612, the outdoor second air duct 622, the first auxiliary heat exchanger 15, the desiccant wheel 31, the indoor second air duct 621, the indoor heat exchanger 14 to the indoor air supply outlet 02 in sequence through the indoor air return opening 01 under the action of the blower 29, so that the temperature of the indoor air is raised or lowered, in addition, during cooling in summer, the indoor air is circulated and dehumidified by passing through the first auxiliary heat exchanger 15 and the desiccant wheel 31, and during heating in winter, the indoor air is humidified by passing through the first auxiliary heat exchanger 15 and the desiccant wheel 31.
When the first air valve 08 is in a horizontal state, the indoor air return opening 01 is closed, and the first outdoor fresh air inlet 03 and the indoor air supply opening 02 are opened, referring to fig. 4, the air conditioning device can introduce fresh air into the room, at this time, the outdoor air enters the second outdoor air channel 622 through the first outdoor fresh air inlet 03 under the action of the air feeder 29, flows through the first auxiliary heat exchanger 15 and the dehumidifying rotating wheel 31, and then flows into the room through the second indoor air channel 621 and the indoor heat exchanger 14, so that the temperature rise or the temperature reduction of the introduced fresh air in the room is realized, and the dehumidification in summer and the humidification in winter are realized.
When the first air valve 08 is in an inclined state and the third air valve 10 is closed, the indoor first air duct 611 is isolated from the outdoor first air duct 612, the indoor first air duct 611 is communicated with the indoor second air duct 621, referring to fig. 5, at the moment, the indoor air return opening 01, the outdoor fresh air first inlet 03 and the indoor air supply opening 02 are all opened, the air conditioning device can introduce fresh air into the room and simultaneously can perform internal circulation of indoor air, air mixing is achieved, and the return air volume is adjusted by adjusting the opening angle of the first air valve 08.
With continued reference to fig. 1, the outdoor exhaust duct 07 room includes an outdoor exhaust upper duct 71 and an outdoor exhaust lower duct 72, the outdoor exhaust upper duct 71 is located below the second duct 62, one end of the outdoor exhaust upper duct 71 is provided with an outdoor fresh air second inlet 04, one end of the outdoor exhaust lower duct 72 is provided with an outdoor exhaust outlet 05, the other end of the outdoor exhaust upper duct 71 is communicated with the other end of the outdoor exhaust lower duct 72, the outdoor exhaust upper duct 71 is provided with a second auxiliary heat exchanger 16 and a part of the desiccant wheel 31, and the outdoor exhaust lower duct 72 is provided with an outdoor heat exchanger 13 and an exhaust fan 30.
The arrangement of the air duct is convenient for the arrangement of each outdoor heat exchanger and the dehumidifying rotating wheel, and the structure is compact.
In the simplified diagrams of the air paths shown in fig. 2 to 5, the air paths on the outdoor side are the same, that is, the outdoor air enters the outdoor air upper air duct 71 through the outdoor fresh air second inlet 04 under the action of the exhaust fan 30, enters the outdoor air lower air duct 72 through the second auxiliary heat exchanger 16 and the desiccant rotor 31, then flows through the outdoor heat exchanger 13, and finally is discharged from the outdoor air outlet 05, so that heat exchange with the outdoor heat exchanger 13 is completed, and frost formation of the outdoor heat exchanger 13 can be effectively avoided during heating in winter.
The specific refrigerant pipeline of the air conditioning device is set as shown in fig. 1, on the basis that a compressor 11, a four-way reversing valve 12, an outdoor heat exchanger 13, a second auxiliary heat exchanger 16, a first auxiliary heat exchanger 15 and an indoor heat exchanger 14 are sequentially connected, a first throttling element 17 is arranged on a pipeline between the indoor heat exchanger 14 and the first auxiliary heat exchanger 15, a liquid pipe end of the second auxiliary heat exchanger 16 is connected with a first branch 22 and a second branch 23, the first branch 22 is connected into the first auxiliary heat exchanger 15, a second throttling element 18 is arranged on the first branch 22, the second branch 23 is connected into an air pipe end of the first auxiliary heat exchanger 15, a first electromagnetic valve 20 is arranged on the second branch 23, an air pipe end of the first auxiliary heat exchanger 15 is connected into an inlet of the compressor 11 through a third branch 24, a second electromagnetic valve 21 is arranged on the third branch 24, and a third throttling element 19 is arranged on a pipeline between the outdoor heat exchanger 13 and the second auxiliary heat exchanger 16.
In the following, the refrigerant flow path of the air conditioner in each operation mode will be briefly described, fig. 6 shows the switching of relevant components of the air conditioner in each cooling mode in summer, and fig. 7 shows the switching of relevant components of the air conditioner in each heating mode in winter.
Summer internal circulation refrigeration common dehumidification mode: as shown in fig. 2, which is not described again, the first throttling element 17 performs a throttling and pressure reducing function, the second throttling element 18 is closed, the third throttling element 19 is fully clamped, the first electromagnetic valve 20 is opened, the second electromagnetic valve 21 is closed, at this time, the first auxiliary heat exchanger 15 and the dehumidifying rotary wheel 31 are closed, the indoor heat exchanger 14 serves as an evaporator, the outdoor heat exchanger 13 and the second auxiliary heat exchanger 16 serve as condensers, the high-temperature and high-pressure refrigerant gas discharged from the compressor 11 passes through the four-way reversing valve 12, at this time, the four-way reversing valve 12 is in a refrigerating state, so that the refrigerant gas flows to the outdoor heat exchanger 13 and the second auxiliary heat exchanger 16, releases heat in the outdoor heat exchanger 13 and the second auxiliary heat exchanger 16 to become a low-temperature and high-pressure gas-liquid two-phase refrigerant, then flows to the first throttling element 20, then to the first throttling element 17, throttled and reduced pressure in the first throttling element 17 to become a low-temperature and low-pressure refrigerant liquid-state refrigerant, and then flows to the indoor heat exchanger 14, heat of the indoor air is evaporated and absorbed outside the indoor heat exchanger 14 to become a low-temperature and low-pressure refrigerant gas-state, and then flows to the compressor 12 again to complete a cycle. In the process, the indoor return air can be cooled and dehumidified once through the indoor heat exchanger 14.
Summer internal circulation refrigeration deep dehumidification mode: as shown in fig. 3, it is not described again, the second throttling element 18 plays a role of throttling and depressurizing, the first throttling element 17 and the third throttling element 19 are fully opened, the first electromagnetic valve 20 and the second electromagnetic valve 21 are closed, at this time, the indoor heat exchanger 14 and the first auxiliary heat exchanger 15 serve as evaporators, the outdoor heat exchanger 13 and the second auxiliary heat exchanger 16 serve as condensers, the desiccant wheel 31 is opened, the high-temperature and high-pressure refrigerant gas discharged from the compressor 11 passes through the four-way reversing valve 12, at this time, the four-way reversing valve 12 is in a refrigeration state, so the refrigerant gas flows to the outdoor heat exchanger 13 and the second auxiliary heat exchanger 16 first, releases heat to become a low-temperature gas-liquid two-phase refrigerant in the outdoor heat exchanger 13 and the second auxiliary heat exchanger 16, then is divided into two paths, one path flows to the second throttling element 18 through the first branch path 22, is throttled and depressurized into a low-temperature and low-pressure liquid refrigerant in the second throttling element 18, then enters the first auxiliary heat exchanger 15, then is merged with the other path, flows to the first branch path 23 to the first electromagnetic valve 20, then flows to the first throttling element 17, and flows to the low-temperature and then flows to the indoor heat exchanger 17, and the low-temperature-pressure refrigerant gas-liquid refrigerant flows to the indoor heat exchanger 14 again, and then flows to the indoor heat exchanger 14, and then to complete the low-temperature-liquid refrigerant cycle refrigerant. In the process, the indoor return air passes through the first auxiliary heat exchanger 15, the desiccant rotor 31 and the indoor heat exchanger 14 for three times of temperature reduction and dehumidification.
Summer fresh air refrigeration mode: as shown in fig. 4, which is not described again, the first throttling element 17 and the second throttling element 18 play a role in throttling and depressurizing, the third throttling element 19 is fully opened, the first electromagnetic valve 20 and the second electromagnetic valve 21 are opened, at this time, the indoor heat exchanger 14 and the first auxiliary heat exchanger 15 serve as evaporators, the outdoor heat exchanger 13 and the second auxiliary heat exchanger 16 serve as condensers, the dehumidifying rotating wheel 31 is opened, the high-temperature and high-pressure refrigerant gas discharged by the compressor 11 passes through the four-way reversing valve 12, at this time, the four-way reversing valve 12 is in a refrigerating state, so that the refrigerant gas flows to the outdoor heat exchanger 13 and the second auxiliary heat exchanger 16 first, releases heat in the outdoor heat exchanger 13 and the second auxiliary heat exchanger 16 to become low-temperature and high-pressure gas-liquid two-phase refrigerant, and then is divided into two paths, one path flows to the second throttling element 18 through the first branch path 22, is throttled and depressurized in the second throttling element 18 to become low-temperature and low-pressure liquid refrigerant, then enters the first auxiliary heat exchanger 15, and then directly returns to the inlet of the compressor 11 through the third branch path 24; the other path of refrigerant flows to the first electromagnetic valve 20 through the second branch 23, then reaches the first throttling element 17, is throttled and depressurized in the first throttling element 17 to become low-temperature and low-pressure liquid refrigerant, then flows into the indoor heat exchanger 14, evaporates and absorbs heat of air outside the pipe in the indoor heat exchanger 14, then becomes low-temperature and low-pressure gaseous refrigerant, flows to the four-way reversing valve 12 again, finally returns to the compressor 11, and completes a refrigeration cycle. In this process, the fresh air introduced from the outdoor passes through the first auxiliary heat exchanger 15, the desiccant rotor 31 and the indoor heat exchanger 14 for the third cooling and dehumidification.
Winter internal circulation heating and humidifying mode: that is, in the winter internal cycle 1 shown in the table of fig. 7, the air path is shown as fig. 3, which is not described again, the second throttling element 18 plays a role of throttling and depressurizing, the first throttling element 17 and the third throttling element 19 are fully opened, the first electromagnetic valve 20 and the second electromagnetic valve 21 are closed, at this time, the indoor heat exchanger 14 and the first auxiliary heat exchanger 15 serve as condensers, the outdoor heat exchanger 13 and the second auxiliary heat exchanger 16 serve as evaporators, the dehumidifying rotary wheel 31 is opened, the high-temperature and high-pressure refrigerant gas discharged from the compressor 11 passes through the four-way reversing valve 12, at this time, the four-way reversing valve 12 is in a heating state, the high-temperature and high-pressure refrigerant gas flows to the indoor heat exchanger 14 first, is thermally converted into a low-temperature and high-pressure gas-liquid two-phase refrigerant in the indoor heat exchanger 14, then flows to the first throttling element 17, then flows to the first auxiliary heat exchanger 15, is thermally converted into a low-temperature and high-pressure liquid-phase refrigerant in the first auxiliary heat exchanger 15, then flows to the second throttling element 18 through the first branch 22, the second throttling element 18, the low-temperature and low-pressure refrigerant gas-phase refrigerant is returned to the outdoor heat exchanger 19, and finally, the outdoor heat exchanger 11 passes through the third throttling element 11. In this process, the indoor air is heated and humidified by the first auxiliary heat exchanger 15, the desiccant rotor 31, and the indoor heat exchanger 14.
Winter internal circulation heating mode: that is, in the winter internal cycle 2 in the table of fig. 7, the air path is as shown in fig. 2, which is not described again, the first throttling element 17 plays a role of throttling and reducing pressure, the second throttling element 18 is fully closed, the third throttling element 19 is fully opened, the first electromagnetic valve 20 is opened, the second electromagnetic valve 21 is closed, at this time, the indoor heat exchanger 14 serves as a condenser, the first auxiliary heat exchanger 15 is closed, the outdoor heat exchanger 13 and the second auxiliary heat exchanger 16 serve as evaporators, the high-temperature and high-pressure refrigerant gas discharged from the compressor 11 passes through the four-way reversing valve 12, at this time, the four-way reversing valve 12 is in a heating state, the high-temperature and high-pressure refrigerant gas flows to the indoor heat exchanger 14 first, is thermally converted into a low-temperature and high-pressure gas-liquid two-phase refrigerant in the indoor heat exchanger 14, then flows to the first throttling element 17, is throttled and reduced pressure in the first throttling element 17 to become a low-temperature and low-pressure refrigerant, then flows into the second auxiliary heat exchanger 16 through the second branch 23 and the first electromagnetic valve 20, heat exchanger 16 absorbs heat from the outside of the pipe, and becomes a low-temperature and low-pressure gas refrigerant, passes through the third throttling element 19 again, and returns to the outdoor heat exchanger 11 to complete the once cycle. In this process, the indoor air is warmed through the indoor heat exchanger 14.
Winter fresh air heating mode: the air path is shown in fig. 4, which is not described again, the second throttling element 18 plays a role of throttling and depressurizing, the first throttling element 17 and the third throttling element 19 are fully opened, the first electromagnetic valve 20 and the second electromagnetic valve 21 are closed, at this time, the indoor heat exchanger 14 and the first auxiliary heat exchanger 15 serve as condensers, the outdoor heat exchanger 13 and the second auxiliary heat exchanger 16 serve as evaporators, the dehumidifying rotating wheel 31 is opened, the high-temperature and high-pressure refrigerant gas discharged by the compressor 11 passes through the four-way reversing valve 12, at this time, the four-way reversing valve 12 is in a heating state, the high-temperature and high-pressure refrigerant gas flows through the indoor heat exchanger 14, the first throttling element 17 and the first auxiliary heat exchanger 15 in sequence, is throttled by the second throttling element 18 and then flows to the second auxiliary heat exchanger 16 and the outdoor heat exchanger 13, and finally returns to the compressor 11 through the four-way reversing valve 12. In the process, the outdoor fresh air is heated and humidified by the first auxiliary heat exchanger 15, the dehumidification rotating wheel 31 and the indoor heat exchanger 14.
Winter mixed air heating mode: as shown in fig. 5, the air path is not described again, the second throttling element 18 plays a role of throttling and depressurizing, the first throttling element 17 and the third throttling element 19 are fully opened, the first electromagnetic valve 20 and the second electromagnetic valve 21 are closed, at this time, the indoor heat exchanger 14 and the first auxiliary heat exchanger 15 serve as condensers, the outdoor heat exchanger 13 and the second auxiliary heat exchanger 16 serve as evaporators, the desiccant wheel 31 is opened, and the refrigerant discharged from the compressor 11 sequentially flows through the four-way reversing valve 12, the indoor heat exchanger 14, the first throttling element 17, the first auxiliary heat exchanger 15, the second throttling element 18, the second auxiliary heat exchanger 16, the outdoor heat exchanger 13, and then returns to the compressor 11 through the four-way reversing valve 12. In the process, the temperature rise and humidification of the indoor air are realized.
The air conditioning device also has a defrosting function in each mode of heating in winter, the frosting of the outdoor heat exchanger is prevented, when the frosting prevention instruction is executed under the heating of the internal circulation 1 in winter, the heating of fresh air and the heating of mixed air, the third throttling element 19 plays a role in throttling and pressure reduction, the first throttling element 17 and the second throttling element are fully opened 18, the opening of the air valve and the electromagnetic valve is in the corresponding main mode, and the refrigerant flow path is not described any more.
When the air conditioning device executes the anti-frosting instruction under the heating of the winter internal cycle 2, the third throttling element 19 plays a role in throttling and pressure reduction, the first throttling element 17 is fully opened, the second throttling element 18 is fully closed, the opening of the air valve and the electromagnetic valve is the same as that of the winter internal cycle 2, and the refrigerant flow path is not described again.
When the air conditioner performs the general dehumidification of the summer internal circulation refrigeration and the deep dehumidification of the summer internal circulation refrigeration, the control method is as follows, and refer to fig. 8:
step 1, starting up in summer;
step 2, firstly, judging whether the indoor current humidity meets the human body comfort area, and simultaneously, judging that the indoor current humidity meets the following two conditions to be in the human body comfort area:
the method has the following steps that 1, the sensible temperature AT is less than or equal to 30 ℃ and the relative humidity is less than or equal to 70%;
condition 2, whether the moisture content dsa1 at the indoor air supply outlet 02 is smaller than the indoor required humidity dxq, dxq = dset-nq/rho G, dset is the moisture content of indoor air, n is the number of indoor people, q is the human body moisture content G, rho is the air density, and G is the air supply quantity m 3 /h；
If dsa1 is less than or equal to dset-nq/rho G, the air conditioning device executes an internal circulation refrigeration common dehumidification mode and enters the step 3;
if dsa1 is larger than dset-nq/rho G, the air conditioning device executes an internal circulation refrigeration deep dehumidification mode and enters the step 5;
step 3, entering a summer internal circulation refrigeration common dehumidification mode;
step 4, if dsa1 is detected to be larger than or equal to dset-nq/rho G + alpha, alpha is a set constant, for example, the value is 1, the frequency of the compressor is increased, then the system judges once at intervals, when the frequency of the compressor is increased to Fmax and dsa1 is larger than or equal to dset-nq/rho G + alpha, namely dsa1 still does not decrease, the indoor humidity load is larger, and at the moment, the air conditioning device is switched into an internal circulation refrigeration deep dehumidification mode;
step 5, entering a summer internal circulation refrigeration deep dehumidification mode;
the system judges that dsa1 is less than or equal to dset-nq/rho G-beta, beta is a set constant, and if the beta is satisfied, the system maintains the current state; if not, the compressor is raised and the first throttling element 17 is closed, more refrigerant is allowed to flow through the second throttling element 18, then it is determined at intervals whether Tsa is less than a set temperature (for example, 18 ℃) or not, if yes, the first throttling element 17 may be closed at this time to avoid a cold wind feeling.
When the air conditioner executes the fresh air cooling and dehumidifying mode, the following control method is performed, referring to fig. 9:
step 1, starting up in summer;
step 2, judging that the following conditions are met, and starting a fresh air mode when indoor CO (carbon monoxide) 2 The concentration is more than or equal to B1, the concentration of formaldehyde is more than or equal to B2, or the concentration of PM2.5 is more than or equal to B3, the condition ofOne of the three modes can start a fresh air mode;
and 3, calculating the required air supply moisture content dsa2, dsa2= dset-q/rho Gr, dset is the moisture content of indoor air, q is the human body moisture content g, rho is the air density, and Gr is the required fresh air volume m of each indoor person 3 /h；
Step 4, judging the relation between the current outdoor moisture content dout and the indoor air supply moisture content dsa2, if dout-dsa2 is less than m, m is a set constant, for example, the value is 8g, closing the dehumidifying rotating wheel 31, otherwise, opening the dehumidifying rotating wheel 31;
step 5, after the dehumidification rotating wheel 31 is closed, the system judges once every a period of time, whether dsa2 is less than or equal to dset-gamma is met, gamma is a set constant, for example, a value is 1, if yes, the current state is maintained, otherwise, the compressor is increased in frequency, and when the compressor is increased in frequency to Fmax and still does not meet the condition that dsa2 is less than or equal to dset-gamma, the dehumidification rotating wheel 31 is opened;
step 6, after the dehumidification rotating wheel 31 is started, the frequency of a compressor is firstly reduced to a rated frequency, the system judges whether dsa2 is equal to or less than dset-q/rho Gr once at intervals, if so, the current state is maintained, otherwise, the frequency of the compressor is increased, if not, the dsa2 is equal to or less than dset-q/rho Gr, the moisture content of outdoor fresh air is extremely large, return air needs to be started, the target moisture content is achieved by utilizing mixed air, the step 7 is started, if energy is saved, the dout is judged to be greater than a set humidity value, if the outdoor moisture content is extremely large, the mode is switched to an internal circulation mode, the fresh air is closed, and the step 8 is started;
step 7, opening the first air valve 08 to be at an angle theta degrees, enabling the first air valve 08 to be in an inclined state, judging once every other period of time whether dsa2 is less than or equal to dset-q/rho Gr, and if not, opening the first air valve 08 until dsa2 is less than or equal to dset-q/rho Gr;
and 8, step 8: closing the fresh air mode and opening the internal circulation mode.
When the air conditioner is used for heating in winter, in order to further prevent the outdoor heat exchanger 13 and the second auxiliary heat exchanger 16 from frosting, on the basis of dehumidification by the dehumidification rotating wheel 31, whether the outdoor heat exchanger 13 has a frosting risk is judged according to the relation between the liquid pipe inlet refrigerant temperature of the outdoor heat exchanger 13 and the dew point temperature of the air inlet side of the outdoor heat exchanger 13, and whether the second auxiliary heat exchanger 16 has a frosting risk is judged according to the relation between the liquid pipe inlet refrigerant temperature of the second auxiliary heat exchanger 16 and the dew point temperature of the air inlet side of the second auxiliary heat exchanger 16;
if the outdoor heat exchanger 13 and/or the second auxiliary heat exchanger 16 has a risk of frost formation, the first solenoid valve 08 is opened, the second throttling element 18 is closed, the third throttling element 19 performs throttling and pressure reduction, the second auxiliary heat exchanger 16 functions as a condenser and operates for a period of time until the risk of frost formation is eliminated by the outdoor heat exchanger 13 and/or the second auxiliary heat exchanger 16, and then the second auxiliary heat exchanger 16 is switched to the evaporator state.
Specifically, a first temperature and humidity sensor 25 for detecting temperature and humidity is disposed at an inlet of the second auxiliary heat exchanger 16, and corresponding dew point temperature is calculated, a first temperature sensor 27 for detecting refrigerant temperature is disposed at an inlet liquid pipe of the second auxiliary heat exchanger 16, a second temperature and humidity sensor 26 for detecting temperature and humidity is disposed at an inlet of the outdoor heat exchanger 13, and corresponding dew point temperature is calculated, a second temperature sensor 28 for detecting refrigerant temperature is disposed at an inlet liquid pipe of the outdoor heat exchanger 13, and the control method shown in fig. 10 is performed:
step 1, judging whether the refrigerant temperature at the liquid pipe inlet of the second auxiliary heat exchanger 16 is less than or equal to the dew point temperature at the air inlet side of the second auxiliary heat exchanger 16 and continues for a period of time (for example, 10 minutes), or the refrigerant temperature at the liquid pipe inlet of the outdoor heat exchanger 13 is less than or equal to-t 1 of the dew point temperature at the air inlet side of the outdoor heat exchanger 13, wherein t1 is a set value, for example, 1 ℃, and if yes, indicating that the second auxiliary heat exchanger 16 or the outdoor heat exchanger 13 has a frosting risk, and entering step 2;
step 2, the first electromagnetic valve 20 is opened, the second throttling element 18 is closed, and the third throttling element 19 is opened for corresponding steps;
step 3, the second auxiliary heat exchanger 16 is used as a condenser and is operated for a period of time, such as 10 minutes;
step 4, judging whether the refrigerant temperature of the liquid pipe inlet of the second auxiliary heat exchanger 16 is equal to or more than the dew point temperature + t2 at the air inlet side of the second auxiliary heat exchanger 16, wherein t2 is a set value, such as 1 ℃, the refrigerant temperature of the liquid pipe inlet of the outdoor heat exchanger 13 is equal to or more than the dew point temperature + t3 at the air inlet side of the outdoor heat exchanger 13, t3 is a set value, such as 1 ℃, if yes, the second auxiliary heat exchanger 16 and the outdoor heat exchanger 13 have no frosting risk, and entering the step 5;
in step 5, the first solenoid valve 20 is closed, the second throttling element 18 is opened for a corresponding number of steps, while the third throttling element 19 is fully opened, the second auxiliary heat exchanger 16 acts as an evaporator, thereby preventing the second auxiliary heat exchanger 16 and the outdoor heat exchanger 13 from frosting.
In the foregoing description of embodiments, the particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (10)

1. An air conditioning apparatus, comprising:
the indoor air supply duct is used for indoor internal circulation return air and/or outdoor fresh air supply;
the outdoor air exhaust duct is used for outdoor air exhaust;
the indoor heat exchanger is arranged in the indoor air supply duct;
the outdoor heat exchanger is arranged in the outdoor air exhaust duct;
the first auxiliary heat exchanger is arranged in the indoor air supply duct;
the second auxiliary heat exchanger is arranged in the outdoor air exhaust duct;
the dehumidification rotating wheel comprises a dehumidification area and a regeneration area, one of the dehumidification area and the regeneration area is positioned in the indoor air supply duct and positioned at the air outlet side of the first auxiliary heat exchanger and the air inlet side of the indoor heat exchanger, and the other of the dehumidification area and the regeneration area is positioned in the outdoor air exhaust duct and positioned at the air outlet side of the second auxiliary heat exchanger and the air inlet side of the outdoor heat exchanger;
when the air conditioning device heats, the first auxiliary heat exchanger is used as a condenser, the second auxiliary heat exchanger is used as an evaporator, the part of the dehumidifying rotating wheel, which is positioned in the outdoor air exhaust duct, is a dehumidifying area, and the part of the dehumidifying rotating wheel, which is positioned in the indoor air supply duct, is a regenerating area.
2. The air conditioner according to claim 1,
the indoor air supply duct comprises a first air duct and a second air duct;
one end of the first air duct is provided with an indoor air return inlet, the other end of the first air duct is provided with an outdoor fresh air first inlet, and a first air valve used for dividing the first air duct into an indoor first air duct and an outdoor first air duct is arranged in the first air duct;
one end of the second air duct is provided with an indoor air supply outlet, the other end of the second air duct is provided with the outdoor fresh air first inlet, and a second air valve used for dividing the second air duct into an indoor second air duct and an outdoor second air duct is arranged in the second air duct;
the outdoor first air duct and the outdoor second air duct are communicated at one end close to the outdoor fresh air first inlet;
the first auxiliary heat exchanger and a part of the dehumidification rotating wheel are arranged in the outdoor second air channel, and the indoor heat exchanger is arranged in the indoor second air channel.
3. Air conditioning unit according to claim 2,
the first air valve is a switchable air valve, and a third air valve is arranged at the position, close to the first air valve, of the outdoor first air channel;
when the first air valve is in a vertical state, the indoor first air channel is isolated from the outdoor first air channel, and the indoor first air channel is communicated with the indoor second air channel;
the first air valve is in a horizontal state, when the third air valve is opened, the indoor first air channel is communicated with the outdoor first air channel, and the indoor first air channel is isolated from the indoor second air channel;
the first air valve is in an inclined state, when the third air valve is closed, the indoor first air channel is isolated from the outdoor first air channel, the indoor first air channel is communicated with the indoor second air channel, and the air return quantity is adjusted by adjusting the opening angle of the first air valve.
4. An air conditioning apparatus according to claim 3,
the compressor, the four-way reversing valve, the outdoor heat exchanger, the second auxiliary heat exchanger, the first auxiliary heat exchanger and the indoor heat exchanger are sequentially connected to form a heat exchange loop of the air conditioning device;
a first throttling element is arranged on a pipeline between the indoor heat exchanger and the first auxiliary heat exchanger;
the liquid pipe end of the second auxiliary heat exchanger is connected with the first branch and the second branch;
the first branch is connected with the first auxiliary heat exchanger, and a second throttling element is arranged on the first branch;
the second branch is connected to the end of the gas pipe of the first auxiliary heat exchanger, and a first electromagnetic valve is arranged on the second branch;
and the air pipe end of the first auxiliary heat exchanger is connected into the inlet of the compressor through a third branch, and a second electromagnetic valve is arranged on the third branch.
5. Air conditioning unit according to claim 4,
the air conditioning device is provided with an internal circulation refrigeration deep dehumidification mode and an internal circulation refrigeration common dehumidification mode;
in the internal circulation refrigeration deep dehumidification mode, the first auxiliary heat exchanger is used as an evaporator, the second auxiliary heat exchanger is used as a condenser, the part of the dehumidification rotating wheel, which is positioned in the outdoor second air channel, is an adsorption area, and indoor return air sequentially flows through the indoor return air inlet, the first air channel, the first auxiliary heat exchanger, the dehumidification rotating wheel, the second air channel and the indoor heat exchanger to the indoor air supply outlet;
in the internal circulation refrigeration common dehumidification mode, the first auxiliary heat exchanger and the dehumidification rotary wheel are closed, the second auxiliary heat exchanger is used as a condenser, and indoor return air sequentially flows through the indoor return air inlet, the indoor first air duct, the indoor second air duct, the indoor heat exchanger and the indoor air supply outlet.
6. An air conditioning apparatus according to claim 5,
and when dsa1 is less than or equal to dset-nq/rho G, the air conditioning device executes the internal circulation refrigeration common dehumidification mode, otherwise, executes the internal circulation refrigeration deep dehumidification mode, wherein dsa1 is the moisture content of an indoor air supply opening, dset is the moisture content of indoor air, n is the number of indoor people, q is the human body moisture content, rho is air density, and G is air supply quantity.
7. Air conditioning unit according to claim 6,
when the air conditioning device executes the internal circulation refrigeration normal dehumidification mode, if dsa1 is detected to be larger than or equal to dset-nq/rho G + alpha, alpha is a set constant, the compressor is increased in frequency, then the system judges once every period of time, and when the frequency of the compressor is increased to Fmax and dsa1 is larger than or equal to dset-nq/rho G + alpha, the air conditioning device is switched into the internal circulation refrigeration deep dehumidification mode;
when the air conditioning device executes the internal circulation refrigeration deep dehumidification mode, the system judges that dsa1 is less than or equal to dset-nq/rho G-beta, beta is a set constant, and if the dsa1 is less than or equal to dset-nq/rho G-beta, the system maintains the current state; if not, the compressor is upscaled and the first throttling element is turned down.
8. Air conditioning unit according to claim 4,
the air conditioning device has a fresh air refrigeration and dehumidification mode, the first auxiliary heat exchanger is used as an evaporator, the second auxiliary heat exchanger is used as a condenser, and the part of the dehumidification rotating wheel, which is positioned in the outdoor second air channel, is an adsorption area;
the first throttling element and the second throttling element perform throttling depressurization, and the first electromagnetic valve and the second electromagnetic valve are opened;
the indoor air return inlet and the first air valve are closed, and outdoor fresh air sequentially flows through the first outdoor fresh air inlet, the first auxiliary heat exchanger, the dehumidification rotating wheel, the second air channel and the indoor heat exchanger to the indoor air supply outlet.
9. Air conditioning unit according to claim 8,
when the air conditioning device executes the fresh air refrigeration dehumidification mode, the system judges the relation between the current outdoor moisture content dout and the indoor required moisture content dsa2, wherein dsa2= dset-q/rho Gr, dset is the moisture content of indoor air, q is the human body moisture content, rho is air density, and Gr is the required fresh air volume of each indoor person;
if dout-dsa2 is less than m, and m is a set constant, the dehumidifying rotating wheel is closed, otherwise, the dehumidifying rotating wheel is opened;
and after the dehumidification rotating wheel is closed, the system judges once every a period of time, if dsa2 is not more than dset-gamma and gamma is a set constant, the current state is maintained, otherwise, the compressor is increased in frequency, when the compressor is increased in frequency to Fmax and dsa2 is more than dset-q/rho Gr, the dehumidification rotating wheel is opened, the first air valve moves to an inclined state, and indoor return air and outdoor fresh air are mixed.
10. Air conditioning unit according to claim 4,
when the air conditioning device performs heating, judging whether the outdoor heat exchanger has a frosting risk or not according to the relationship between the liquid pipe refrigerant temperature of the outdoor heat exchanger and the dew point temperature of the air inlet side of the outdoor heat exchanger, and judging whether the second auxiliary heat exchanger has the frosting risk or not according to the relationship between the liquid pipe refrigerant temperature of the second auxiliary heat exchanger and the dew point temperature of the air inlet side of the second auxiliary heat exchanger;
if the outdoor heat exchanger and/or the second auxiliary heat exchanger has a frosting risk, the first electromagnetic valve is opened, the second throttling element is closed, a third throttling element is arranged on a pipeline between the outdoor heat exchanger and the second auxiliary heat exchanger, throttling depressurization is carried out by the third throttling element, the second auxiliary heat exchanger serves as a condenser and operates for a period of time until the frosting risk of the outdoor heat exchanger and/or the second auxiliary heat exchanger is eliminated, and then the second auxiliary heat exchanger is switched to an evaporator state.
CN202210783190.3A 2022-07-05 2022-07-05 Air conditioner Active CN115234981B (en)

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