CN202734058U - Air-conditioner indoor unit with fresh air heat recovery device - Google Patents

Air-conditioner indoor unit with fresh air heat recovery device Download PDF

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Publication number
CN202734058U
CN202734058U CN2012203007865U CN201220300786U CN202734058U CN 202734058 U CN202734058 U CN 202734058U CN 2012203007865 U CN2012203007865 U CN 2012203007865U CN 201220300786 U CN201220300786 U CN 201220300786U CN 202734058 U CN202734058 U CN 202734058U
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CN
China
Prior art keywords
wind
new wind
air
wind wheel
heat exchanger
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Expired - Lifetime
Application number
CN2012203007865U
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Chinese (zh)
Inventor
赵夫峰
张智
程志明
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GD Midea Air Conditioning Equipment Co Ltd
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Guangdong Midea Refrigeration Equipment Co Ltd
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Priority to CN2012203007865U priority Critical patent/CN202734058U/en
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Anticipated expiration legal-status Critical
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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
    • F24F12/00—Use of energy recovery systems in air conditioning, ventilation or screening
    • F24F12/001—Use of energy recovery systems in air conditioning, ventilation or screening with heat-exchange between supplied and exhausted air
    • F24F12/006—Use of energy recovery systems in air conditioning, ventilation or screening with heat-exchange between supplied and exhausted air using an air-to-air heat exchanger
    • 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
    • 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
    • F24F3/00—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems
    • F24F3/12—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling
    • F24F3/14—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling by humidification; by dehumidification
    • F24F3/1411—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling by humidification; by dehumidification by absorbing or adsorbing water, e.g. using an hygroscopic desiccant
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F6/00—Air-humidification, e.g. cooling by humidification
    • F24F6/02—Air-humidification, e.g. cooling by humidification by evaporation of water in the air
    • F24F6/04—Air-humidification, e.g. cooling by humidification by evaporation of water in the air using stationary unheated wet elements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F6/00—Air-humidification, e.g. cooling by humidification
    • F24F6/02—Air-humidification, e.g. cooling by humidification by evaporation of water in the air
    • F24F6/08—Air-humidification, e.g. cooling by humidification by evaporation of water in the air using heated wet elements
    • F24F6/10—Air-humidification, e.g. cooling by humidification by evaporation of water in the air using heated wet elements heated electrically
    • 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

Abstract

Disclosed is an air-conditioner indoor unit with a fresh air heat recovery device. The air-conditioner indoor unit with the fresh air heat recovery device comprises a refrigerating and heating device arranged in the indoor unit and the fresh air heat recovery device. The fresh air heat recovery device is arranged at the lower portion of the indoor unit and the refrigerating and heating device is arranged at the upper portion of the indoor unit. The fresh air heat recovery device comprises a heat exchanger core body, an air exhausting wind wheel with an air exhausting motor, a fresh air wind wheel with a fresh air motor, a first filter screen and a second filter screen. The lower portion of the indoor unit is provided with an outdoor fresh air inlet, a fresh air outlet, an indoor air exhausting inlet and an indoor air exhausting outlet. A fresh air pass-way is composed successively of the outdoor fresh air inlet, the first filter screen, an air cleaner, the heat exchanger core body, a humidifying mechanism, a dehumidifying mechanism, the fresh air wind wheel and the fresh air outlet. The air-conditioner indoor unit integrates the fresh air and the heat recovery without alone installation. The air-conditioner indoor unit has the advantages of being healthy, energy-saving and simple to maintain.

Description

Air conditioner room unit with new wind-heat recovery
Technical field
The utility model relates to a kind of air-conditioner, particularly a kind of air conditioner room unit with new wind-heat recovery.
Background technology
Along with living standard improves gradually, people are also more and more higher to the comfortableness requirement of living environment, and air-conditioner is commonly used.Yet traditional air-conditioner is the air themperature of regulating in the enclosed environment, people can only breathing less and less arrive ozone unconsciously, the air ambient of long-term sealing makes pernicious gas and biological pollutant can not get reasonable conversion and dilution, carbon dioxide, VOC equal size severe overweight, indoor air quality worsens, the health of people of live and work is affected in air conditioning area thereby make, " air conditioner disease " that appearance it has often been said, therefore, the supply of the air quality of air conditioning area, new wind has caused people's concern.
China national quality supervision and test epidemic disease office, the Ministry of Public Health, State Environmental Protection Administration have issued GB/T18883-2002 IAQ standard on November 9th, 2002, stipulate that wherein minimum fresh air requirmente is everyone per hour 30 cubic metres.Released in the market part with the air conditioner room unit of new wind, there is following shortcoming in this air-conditioner: 1) owing to not possessing heat reclamation device, directly introduce new wind, the energy consumption of air-conditioner increases, 2) resh air requirement is little, can't satisfy people's normal life requirement.Also there is in addition independent new wind total-heat exchanger to satisfy the requirement of air conditioner surroundings resh air requirement, can the recovery section energy.But this new wind total-heat exchanger does not generally have air cleaning, humidification and dehumidification function, and needs independent installation of ceiling, and its installation difficulty, mounting cost, maintenance be corresponding increase all.
Chinese patent literature CN1687656A discloses a kind of fresh air heat recovery method and device thereof on October 26th, 2005, the method is provided with fresh flue and the exhausting duct of mutually isolating with air duct board, and a side that is positioned at exhausting duct at air duct board at least is with the liquid-soaked layer, during refrigeration by micro liquid in the liquid-soaked layer and/or its surface flow to realize the heat exchange between new wind and the air draft; When heating directly by the temperature difference between fresh flue and the exhausting duct to realize the heat exchange between new wind and the air draft.This device comprises wind path wall, fresh inlet, new wind outlet, air draft import, wind exhausting outlet, fresh flue and exhausting duct, also comprise liquid-inlet, cloth liquid structure, liquid-inlet links to each other with cloth liquid structure, and is positioned at a side of exhausting duct with the liquid-soaked layer at described air duct board at least.This fresh air heat recovery method and apparatus structure more complicated thereof.
The utility model content
The purpose of this utility model aims to provide a kind of simple and reasonable, new wind of collection and recuperation of heat is integrated, health energy-saving, need not install separately, safeguard the air conditioner room unit that the new wind-heat of simple band reclaims, to overcome weak point of the prior art.
A kind of air conditioner room unit with new wind-heat recovery by this purpose design, comprise the refrigeration and the heating combined equipment that are arranged in the indoor set, its architectural feature is also to comprise new wind-heat retracting device, this new wind-heat retracting device is arranged on the bottom of indoor set, and refrigeration and heating combined equipment are arranged on the top of indoor set;
New wind-heat retracting device comprises heat exchanger core, with the air draft wind wheel of motor exhaust, with new wind wind wheel, the first screen pack, second screen pack of new wind turbine,
The bottom of indoor set is provided with outdoor new wind entrance, new wind air outlet slit, indoor exhaust wind air intake vent and indoor exhaust wind air outlet slit;
Wherein, the outdoor new wind entrance that sets gradually, the first screen pack, heat exchanger core, new wind wind wheel and new wind air outlet slit form new wind passage;
The indoor exhaust wind air intake vent that sets gradually, the second screen pack, heat exchanger core, air draft wind wheel and indoor exhaust wind air outlet slit form air exhaust passage.
Described new wind-heat retracting device also comprises air purifier, humidification mechanism and desiccant body, and the outdoor new wind entrance that sets gradually, the first screen pack, air purifier, heat exchanger core, humidification mechanism, desiccant body, new wind wind wheel and new wind air outlet slit form new wind passage.
Described heat exchanger core is full heat converter core, the hot core body of Exchange of apparent heat or runner exchanged heat core body.
Described with motor exhaust the air draft wind wheel and be arranged on simultaneously the same side of heat exchanger core with the new wind wind wheel of new wind turbine;
Perhaps, be arranged on a side of heat exchanger core with the air draft wind wheel of motor exhaust; Be arranged on the opposite side of heat exchanger core with the new wind wind wheel of new wind turbine.
Described new wind turbine and motor exhaust are respectively two independently motors; Perhaps, new wind turbine and motor exhaust are same motor.
Described new wind wind wheel is single suction centrifugal wind wheel or double-suction centrifugal pump wind wheel; The air draft wind wheel is single suction centrifugal wind wheel or double-suction centrifugal pump wind wheel.
Described humidification mechanism is ultrasonic humidifier, electrical heating type humidifier or wet film evaporative humidifier.
Described desiccant body is semiconductor refrigeration dehumidifier, cooling dehumidifier or absorbed moisture removing device.
Described refrigeration and heating combined equipment comprise heat exchanger, wind wheel, motor and air outlet, and wherein, wind wheel is through-flow list wind wheel, through-flow multi-wind wheel, centrifugal single wind wheel or centrifugal multi-wind wheel.
Described heat exchanger is fin circular pipe type heat exchanger, fin ellipse tube type heat exchanger or parallel-flow heat exchanger, and wherein, the profile of heat exchanger is in line shape, L shaped, U-shaped, G shape, arc or rolls over shape more.
Described wind wheel is vertically placed, horizontal positioned or slant setting.
The utility model is by adopting new wind-heat retracting device in the bottom of indoor set, perhaps increase again air cleaning, humidification and desiccant body, traditional refrigeration and heating combined equipment are adopted in top at indoor set, not only can realize traditional refrigeration and heat-production functions, and can introduce separately function or the difference in functionality combination such as new wind, air cleaning, humidification and dehumidifying, heat recovery function, thereby realize comfortableness, the health and energy-conservation of room air conditioner.
The utlity model has simple and reasonable, the new wind of collection and recuperation of heat is integrated, health energy-saving, independent simple characteristics of installation and maintenance.
Description of drawings
Fig. 1 is the utility model the first example structure schematic diagram.
Fig. 2 is the utility model the second example structure schematic diagram.
Fig. 3 is the utility model the 3rd example structure schematic diagram.
Fig. 4 is the utility model the 4th example structure schematic diagram.
Among the figure: 1 is outdoor new wind entrance, and 2 is the first screen pack, and 3 is air purifier, 4 is heat exchanger core, and 5 is humidification mechanism, and 6 is desiccant body, 7 is new wind turbine, and 8 is new wind wind wheel, and 9 is new wind air outlet slit, 10 is the indoor exhaust wind air intake vent, and 11 is the second screen pack, and 12 is motor exhaust, 13 are the air draft wind wheel, and 14 is heat exchanger, and 15 is motor, 16 is wind wheel, and 17 is air outlet, and 18 is the indoor exhaust wind air outlet slit.
The specific embodiment
Below in conjunction with drawings and Examples the utility model is further described.
The first embodiment
Referring to Fig. 1, this comprises the refrigeration and heating combined equipment and the new wind-heat retracting device that are arranged in the indoor set, wherein with the air conditioner room unit that new wind-heat reclaims, new wind-heat retracting device is arranged on the bottom of indoor set, and refrigeration and heating combined equipment are arranged on the top of indoor set.
New wind-heat retracting device comprises heat exchanger core 4, with the air draft wind wheel 13 of motor exhaust 12, with new wind wind wheel 8, the first screen pack 2 and second screen pack 11 of new wind turbine 7.The bottom of indoor set is provided with outdoor new wind entrance 1, new wind air outlet slit 9, indoor exhaust wind air intake vent 10 and indoor exhaust wind air outlet slit 18.
Wherein, the outdoor new wind entrance 1 that sets gradually, the first screen pack 2, heat exchanger core 4, new wind wind wheel 8 and new wind air outlet slit 9 form new wind passage; The indoor exhaust wind air intake vent 10 that sets gradually, the second screen pack 11, heat exchanger core 4, air draft wind wheel 13 and indoor exhaust wind air outlet slit 18 form air exhaust passage.
In the present embodiment, described new wind-heat retracting device also comprises air purifier 3, humidification mechanism 5 and desiccant body 6, and the outdoor new wind entrance 1 that sets gradually, the first screen pack 2, air purifier 3, heat exchanger core 4, humidification mechanism 5, desiccant body 6, new wind wind wheel 8 and new wind air outlet slit 9 form new wind passage.
Refrigeration comprises heat exchanger 14, wind wheel 16, motor 15 and air outlet 17 with heating combined equipment, and wherein, wind wheel 16 is through-flow list wind wheel, through-flow multi-wind wheel, centrifugal single wind wheel or centrifugal multi-wind wheel.In this example, wind wheel 16 is through-flow list wind wheel.
Heat exchanger 14 is fin circular pipe type heat exchanger, fin ellipse tube type heat exchanger or parallel-flow heat exchanger, and wherein, the profile of heat exchanger 14 is in line shape, L shaped, U-shaped, G shape, arc or rolls over shape more.In this example, heat exchanger 14 is the fin circular pipe type heat exchanger of U-shaped.
Wind wheel 16 is vertically placed, horizontal positioned or slant setting.In this example, wind wheel 16 is vertically placed.
Heat exchanger core 4 is full heat converter core, the hot core body of Exchange of apparent heat or runner exchanged heat core body.Adopt full heat converter core and runner exchange core body in the larger area of humidity, carry out sensible heat and recovery of latent heat; Adopt sensible heat exchanger in the area that humidity is less, carry out sensible heat and reclaim.In this example, employing is total-heat exchanger.
With the air draft wind wheel 13 of motor exhaust 12 be arranged on simultaneously the same side of heat exchanger core 4 with the new wind wind wheel 8 of new wind turbine 7; Perhaps, be arranged on a side of heat exchanger core 4 with the air draft wind wheel 13 of motor exhaust 12; Be arranged on the opposite side of heat exchanger core 4 with the new wind wind wheel 8 of new wind turbine 7.In this example, be arranged on the downside of heat exchanger core 4 with the air draft wind wheel 13 of motor exhaust 12, be arranged on the upside of heat exchanger core 4 with the new wind wind wheel 8 of new wind turbine 7.
New wind turbine 7 and motor exhaust 12 are respectively two independently motors; Perhaps, new wind turbine 7 and motor exhaust 12 are same motor.In this example, new wind turbine 7 and motor exhaust 12 are respectively two independently motors.
New wind wind wheel 8 is single suction centrifugal wind wheel or double-suction centrifugal pump wind wheel; Air draft wind wheel 13 is single suction centrifugal wind wheel or double-suction centrifugal pump wind wheel.In this example, new wind wind wheel 8 and air draft wind wheel 13 are the double-suction centrifugal pump wind wheel.
Humidification mechanism 5 is ultrasonic humidifier, electrical heating type humidifier or wet film evaporative humidifier.In this example, humidification mechanism 5 adopts ultrasonic humidifier.
Desiccant body 6 is semiconductor refrigeration dehumidifier, cooling dehumidifier or absorbed moisture removing device.In this example, desiccant body 6 adopts cooling dehumidifier to carry out cooling and dehumidifying
During concrete operation: under the drive of new wind wind wheel 8, outdoor new wind enters heat exchanger core 4, humidification mechanism 5 and desiccant body 6, enters indoor by new wind air outlet slit 9 at last by behind outdoor new wind entrance 1, the first screen pack 2 and the air purifier 3.Under the drive of air draft wind wheel 13, indoor exhaust wind by indoor exhaust wind air intake vent 10, the second screen pack 11, enter heat exchanger core 4, discharge outdoor by indoor exhaust wind air outlet slit 18 at last.At this moment, new wind and air draft are carried out heat recovery by heat exchanger core 4.
When the cooling condition operation is carried out on the top of indoor set, make to enter indoor new air temperature reduction.When the heating condition operation is carried out on the top of indoor set, make to enter indoor new wind rising.Because outdoor new wind has promoted the quality of indoor fresh air through filtering and air cleaning.
The second embodiment
Referring to Fig. 2, in the present embodiment, heat exchanger 14 is in line shape fin ellipse tube type heat exchanger; Wind wheel 16 is up and down two and horizontal positioned, and wind wheel 16 be the through-flow multi-wind wheel, namely pair tubular wine wheels; Motor 15 is two.All the other are not stated part and see the first embodiment, repeat no more.
The 3rd embodiment
Referring to Fig. 3, in the present embodiment, heat exchanger 14 is in line shape fin circular pipe type heat exchanger, and heat exchanger 14 is slant setting, and wind wheel 16 adopts centrifugal wind wheel.
All the other are not stated part and see the first embodiment, repeat no more.
The 4th embodiment
Referring to Fig. 4, in the present embodiment, new wind wind wheel 8 and new wind turbine 7, air draft wind wheel 13 and motor exhaust 12 are arranged on the upside of heat exchanger core 4, and indoor exhaust wind air intake vent 10 is arranged on the below of new wind air outlet slit 9, and indoor exhaust wind air outlet slit 18 is arranged on the top of new wind entrance 1.
All the other are not stated part and see the first embodiment, repeat no more.

Claims (10)

1. air conditioner room unit that reclaims with new wind-heat, comprise the refrigeration and the heating combined equipment that are arranged in the indoor set, it is characterized in that also comprising new wind-heat retracting device, this new wind-heat retracting device is arranged on the bottom of indoor set, and refrigeration and heating combined equipment are arranged on the top of indoor set;
New wind-heat retracting device comprises heat exchanger core (4), with the air draft wind wheel (13) of motor exhaust (12), with new wind wind wheel (8), the first screen pack (2) and second screen pack (11) of new wind turbine (7),
The bottom of indoor set is provided with outdoor new wind entrance (1), new wind air outlet slit (9), indoor exhaust wind air intake vent (10) and indoor exhaust wind air outlet slit (18);
Wherein, the outdoor new wind entrance (1) that sets gradually, the first screen pack (2), heat exchanger core (4), new wind wind wheel (8) and new wind air outlet slit (9) form new wind passage;
The indoor exhaust wind air intake vent (10) that sets gradually, the second screen pack (11), heat exchanger core (4), air draft wind wheel (13) and indoor exhaust wind air outlet slit (18) form air exhaust passage.
2. the air conditioner room unit that reclaims of the new wind-heat of band according to claim 1, it is characterized in that described new wind-heat retracting device also comprises air purifier (3), humidification mechanism (5) and desiccant body (6), the outdoor new wind entrance (1) that sets gradually, the first screen pack (2), air purifier (3), heat exchanger core (4), humidification mechanism (5), desiccant body (6), new wind wind wheel (8) and new wind air outlet slit (9) form new wind passage.
3. the air conditioner room unit of the new wind-heat recovery of band according to claim 1 is characterized in that described heat exchanger core (4) is full heat converter core, the hot core body of Exchange of apparent heat or runner exchanged heat core body.
4. the air conditioner room unit that reclaims of the new wind-heat of band according to claim 1 is characterized in that described air draft wind wheel (13) with motor exhaust (12) and is arranged on simultaneously the same sides of heat exchanger core (4) with the new wind wind wheel (8) of new wind turbine (7);
Perhaps, be arranged on a side of heat exchanger core (4) with the air draft wind wheel (13) of motor exhaust (12); Be arranged on the opposite side of heat exchanger core (4) with the new wind wind wheel (8) of new wind turbine (7).
5. the air conditioner room unit of the new wind-heat recovery of band according to claim 1 is characterized in that described new wind turbine (7) and motor exhaust (12) are respectively two independently motors; Perhaps, new wind turbine (7) and motor exhaust (12) are same motor.
6. the air conditioner room unit of the new wind-heat recovery of band according to claim 1 is characterized in that described new wind wind wheel (8) is single suction centrifugal wind wheel or double-suction centrifugal pump wind wheel; Air draft wind wheel (13) is single suction centrifugal wind wheel or double-suction centrifugal pump wind wheel.
7. the air conditioner room unit of the new wind-heat recovery of band according to claim 1 is characterized in that described humidification mechanism (5) is ultrasonic humidifier, electrical heating type humidifier or wet film evaporative humidifier.
8. the air conditioner room unit of the new wind-heat recovery of band according to claim 1 is characterized in that described desiccant body (6) is semiconductor refrigeration dehumidifier, cooling dehumidifier or absorbed moisture removing device.
9. the air conditioner room unit that reclaims to the new wind-heat of 8 arbitrary described bands according to claim 1 is characterized in that described refrigeration and heating combined equipment comprise heat exchanger (14), wind wheel (16), motor (15) and air outlet (17); Wherein, wind wheel (16) is through-flow list wind wheel, through-flow multi-wind wheel, centrifugal single wind wheel or centrifugal multi-wind wheel, and described wind wheel (16) is vertically placed, horizontal positioned or slant setting.
10. the air conditioner room unit that reclaims of the new wind-heat of band according to claim 9, it is characterized in that described heat exchanger (14) is fin circular pipe type heat exchanger, fin ellipse tube type heat exchanger or parallel-flow heat exchanger, wherein, the profile of heat exchanger (14) is in line shape, L shaped, U-shaped, G shape, arc or rolls over shape more.
CN2012203007865U 2012-06-25 2012-06-25 Air-conditioner indoor unit with fresh air heat recovery device Expired - Lifetime CN202734058U (en)

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