Abstract: A moisture control system includes a cabinet having a mullion defining first and second compartments and openings within the mullion to provide selective communication between the compartments. An evaporator is disposed in the first compartment. A cooling bank is disposed in the second compartment in selective thermal communication with the evaporator, and includes cooling and condensing portions separated by a dividing member, and a fluid collector disposed proximate the condensing portion. A first cooling fan is disposed proximate the evaporator and configured to direct air across the evaporator and through the first compartment. A second cooling fan is disposed proximate the cooling bank and operable between an evaporator position in fluid communication with the evaporator and the cooling bank, and a bank position in fluid communication with the cooling bank. A panel assembly is disposed proximate the plurality of openings and operable between a plurality of positions.

Abstract: An appliance having a fresh food storage compartment and a freezer compartment. The appliance includes a forced air coil system disposed between the fresh food storage compartment and the freezer compartment and is configured to selectively provide cooling to one or both of the at least one fresh food storage compartment and the at least one freezer compartment. The forced air coil system includes an evaporator fan configured to provide cooling to the food storage compartment, the freezer compartment, or both.

Abstract: A control system for a refrigeration system with dual evaporators is provided. In one embodiment, a control system for a dual evaporator refrigeration system is provided where the evaporators are operated simultaneously to provide for improved temperature and humidity control in a refrigerator appliance. In another embodiment, the control system can also use a linear model that is designed to minimize or remove excess enthalpy from one or more compartments and/or features of the appliance. The control system can also be configured with at least one variable speed compressor that is operated at a speed that will remove excess enthalpy within a desired time period while also operating at an optimized speed for energy efficiency.

Abstract: Apparatus and methodologies are provided to improve the refrigeration system by precisely controlling refrigerator compartment and heat exchanger temperatures through continuous modulation of device speeds or positions to match capacity with instantaneous load. A controller in a refrigerator is configured to provide a plurality of control loops to control various operational aspects of selected components in the refrigerator. A first loop controls the operating speed of a compressor based on temperature of the evaporator or based on the desired speed of an evaporator fan. A second control loop controls speed of an evaporator fan to maintain a prescribed freezer compartment temperature. A third control loop maintains a prescribed temperature in a fresh food compartment. In certain embodiments selected of the control loops may be thermodynamically coupled by way of thermal interaction between the various cooled compartments rather than being electrically coupled.

Abstract: A high-efficiency HVAC system and method of operation, for use in a house or building, having a plurality of components, including flexible, plastic duct tubing forming supply pipes that connect an air handler and a plurality of zones to deliver supply air to the zones and return pipes that connect the air handler and the zones to re-circulate return air; the air handler having a fan assembly powered by a variable blower motor to blow supply air to the zones; a heat pump having a variable compressor powered by a variable compressor motor to direct a working fluid to and from the air handler and a variable fan motor that rotates a fan blade within the heat pump; and a circuit control system for adjusting the variable compressor motor and the variable fan motor in the heat pump and the variable blower motor in the air handler.

Abstract: The filter 3 is extruded to the outside of the casing of the air conditioner along the inner side of an open panel 15 which is provided at the front surface side of an air intake grill 14 and opened/closed at the time of the operation of the air conditioner.

Abstract: A system for decreasing the response time of a vehicle heating ventilation and air conditioning (“HVAC”) system is described. A fan circulates air through a HVAC casing. Circulating air through the HVAC casing creates a high-pressure zone within the HVAC casing. A thermal expansion valve is located outside of the HVAC casing. An outlet port is located on the HVAC casing to allow air to be ported from the high-pressure zone toward the thermal expansion valve. Air ported from the high-pressure zone may be directed toward the thermal expansion valve by a nozzle. The air increases the temperature of the thermal expansion valve and allows additional refrigerant to flow through the thermal expansion valve.

Abstract: An apparatus for storing food is provided that includes a food storage chamber, a cooling device, a scroll-type fan housing with a fan, and a duct that guides cool air from the scroll-type fan housing to the food storage chamber. The scroll-type fan housing may be located to the left or right of the cooling device, and the duct may be located above or below the cooling device and the scroll-type fan housing. Alternatively, the scroll-type fan housing may be located above or below the cooling device, and the duct located on a left or right side of the cooling device and the scroll-type fan housing. These arrangements result in more usable space within the food storage chamber than other conventional arrangements.

Abstract: A refrigerator is provided. The refrigerator comprises: a main body; at least one freezing chamber disposed in the main body and comprising at least one quick-freezing chamber; a freezing evaporator disposed in the main body and behind the at least one freezing chamber, and spaced apart from the at least one freezing chamber via a freezing air duct cover plate; a freezing fan corresponding to the at least one freezing chamber and a quick-freezing fan corresponding to the at least one quick-freezing chamber, being disposed above the freezing evaporator respectively and configured to blow cold air generated by the freezing evaporator into the at least one freezing chamber and the at least one quick-freezing chamber respectively; and a controller configured to control the freezing fan and the quick-freezing fan, wherein the controller controls the quick-freezing fan to quick-freeze the at least one quick-freezing chamber when needed.

Abstract: A mobile refrigeration cabinet that includes a refrigerated section, a non-refrigerated section that has an aperture in a side thereof, and an opening between the refrigerated and non-refrigerated section. The aperture allows access to the non-refrigerated section. The cabinet may include a movable tray disposed in the non-refrigerated section that is movable through the aperture, and a refrigeration system removably mounted on the movable tray. A biasing system is configured to engage the movable tray so as to bias the refrigeration system towards the opening between the refrigerated section and the non-refrigerated section such that a portion of the refrigeration system sealingly engages the opening.

Abstract: The present disclosure relates to systems and methods for creating and maintaining modified and controlled atmospheres (MA/CA) in a rigid sealable container having at least one refrigeration unit with an integrated oxygen reduction means. The refrigeration unit provides the necessary ambient atmosphere movement for the oxygen reduction means, such as a hydrogen fuel cell. The systems and methods are useful in the, storage, transport, distribution, processing and packaging of fresh perishables with a focus on altering the natural gaseous environment around the perishables such that fresh shelf-life is extended. The systems may operate in a power generation/power production mode, such that the fuel cells maintain the MA/CA environment while providing both primary and back-up power.

Abstract: A refrigerator, in which a main body includes a refrigerating chamber and a freezing chamber. A cold air generation chamber for the freezing chamber is provided on an uppermost part of the main body, communicates with the freezing chamber, and houses a freezing chamber evaporator. A cold air generation chamber for the refrigerating chamber is provided separate from the cold air generation chamber for the freezing chamber and houses a refrigerating chamber evaporator.

Abstract: The present invention provides a refrigerator including an outer casing, an inner casing mounted inside the outer casing to define a refrigerating chamber and a freezing chamber, an evaporator installed between the outer casing and the inner casing to supply cool air, a separate room positioned in any one of the refrigerating chamber and the freezing chamber, and a passage for gliding the cool air generated by the evaporator directly to the separate room. In this configuration, the cooling efficiency of the separate room can be improved.

Abstract: A heat exchanger door system includes a heat exchanger and a first rotatable member, proximate to the heat exchanger, that rotates about an axis of rotation. The system includes a first door member rolled around the rotatable member and movable from a rolled position to an unrolled position in which the first door member covers more of the heat exchanger than when the door member is in the rolled position.

Abstract: An air conditioner is provided. The air conditioner includes: an indoor device installed at indoor; an outdoor device connected to the indoor device using a refrigerant pipe; a ventilation unit for exchanging heat of outdoor air and indoor air while ventilating indoor air and outdoor air; and a guidance duct for communicating the ventilation unit and an air inhalation portion of the outdoor device in order to guide indoor air exhausted from the ventilation unit to an air inhalation portion faulted in the outdoor device. Therefore, the number of ventilation holes to form in an outer wall of a building can be minimized, a construction cost can be reduced, and performance of the air conditioner can be improved.

Abstract: A refrigerator includes an air guide that is provided with a defrost water hole and that is inclined toward the defrost water hole. The air guide guides cold air discharged from the cold air fan to a guide duct and also guides, to the defrost water hole, defrost water generated at the cold air fan.

Abstract: The present disclosure relates to a refrigerator having a temperature changing room, including a body including a freezer and a separate cold room; doors adapted to open and close the freezer and the cold room; and the temperature changing room in the cold room to maintain a low temperature state to keep an item stored therein fresh, wherein a rear surface of the temperature changing room communicates with a rear surface of an inner case of the body in contact with the temperature changing room, and the temperature changing room has a cool air supplier adapted to supply cool air directly to an interior thereof from an evaporator behind the rear surface of the inner case of the body through a communicating structure thereof.

Abstract: A heating, venting, and air conditioning (HVAC) system for a vehicle according to the principles of the present disclosure includes a blower, an evaporator, a heater core, and a single door. The blower is operable to blow air. The evaporator is positioned downstream from the blower and is operable to cool air flowing through the evaporator. The heater core is positioned downstream from the evaporator and is operable to heat air flowing through the heater core. The single door is positioned downstream from the heater core and is rotatable to control airflow through the heater core and to direct airflow to at least one of a first outlet and a second outlet.

Abstract: A showcase in which a cooling fan is provided on a cooling room side and a cooling fan motor is provided on a machine room side, wherein attaching and detaching the cooling fan can be facilitated. The showcase has a display room provided over an insulating wall and the machine room provided under the insulating wall. The machine room has a top plate, with a portion of the top plate being raised above a remaining portion of the top plate. A compressor and a condenser of a cooling unit are disposed in the machine room. The cooling room is provided in the insulating wall and an evaporator and the cooling fan of the cooling unit are disposed in the cooling room. The cooling fan motor is disposed in the machine room to drive the cooling fan. The cooling fan motor is detachably attached, from a lateral direction, to the top plate of the machine room at the raised portion.

Abstract: A refrigeration system includes an airflow system which eliminates the traditional air tower in the freezer area by utilizing at least one air outlet formed between a freezer cavity area and a fresh food cavity area. The air outlet is configured to permit at least a portion of a cooled air stream generated by a fan of an evaporator assembly and circulated in the freezer cavity area to flow into the fresh food cavity area through the air outlet. The refrigeration system also includes at least one air return formed between the evaporator assembly and the fresh food cavity area. The air return is configured such that air from the fresh food cavity area flows into the evaporator assembly through the air return.

Abstract: A refrigerator having a freezer compartment and a refrigerator compartment that circulates a plurality of individual refrigerating cycles using a plurality of compressors so as to individually cool the freezer compartment and the refrigerator compartment. The refrigerator includes a plurality of compressors, a plurality of condensers, a plurality of expansion valves, and a plurality of evaporators. One of the plurality of condensers is disposed in a machine compartment and the other condenser is disposed outside the machine compartment so that a heat dissipation effect of the machine compartment may be improved and arrangement availability may be increased. Also, the refrigerator includes a plurality of compressors, a dual path condenser, a plurality of expansion valves, and a plurality of evaporators. The dual path condenser may have a plurality of individual condensation paths.

Abstract: A refrigerator includes a body, first and second storage compartments and a machine compartment formed in the body, a blower fan disposed in the machine compartment, first and second refrigerating units comprising first and second compressors to compress first and second refrigerants, respectively, first and second condensers to condense the first and second refrigerants, respectively, first and second expansion valves to expand the first and second refrigerants, respectively, and first and second evaporators to evaporate the first and second refrigerants, respectively, the first and second refrigerating units supplying cold air to the first and storage compartments, respectively. The first compressor, the second compressor, and the first condenser are disposed in the machine compartment and are cooled by forcible flow of air caused by the blower fan, and the second condenser is disposed outside the machine compartment and is cooled by natural convection of air.

Abstract: Embodiments of the invention provide an air conditioning unit that includes an intake vent, an exhaust vent, a return vent, a supply vent, and an economizer assembly including a sliding damper and a partition. The partition includes an opening through which air can flow from the return vent to the supply vent during a mechanical cooling mode. The sliding damper includes a vertical panel capable of moving vertically to close the intake vent and the exhaust vent during the mechanical cooling mode and an angled panel capable of closing the opening in the partition in order to enter an economizer mode.

Abstract: A refrigerator includes a cabinet having a plurality of storage compartments and a cold air generating compartment provided in an upper portion of the cabinet. The cold air generating compartment is in communication with the plurality of the storage compartments and houses a plurality of evaporators, with each evaporator corresponding to a particular storage compartment in the cabinet.

Abstract: A modular chiller for an aircraft galley beverage cart compartment is disclosed characterized by a cassette that inserts into the galley compartment above the beverage cart and houses an air return duct, a heat exchanger, a fan, and an air supply outlet. The chiller further includes a control valve for controlling the amount of air passing through the heat exchanger, and an electronic control box for control over the chiller, where the cassette is disposed between the beverage cart and a galley work deck.

Abstract: A freezer for a product includes a housing having a sidewall defining a chamber in the housing, and an inlet and an outlet in communication with the chamber; and a pair of pistons operatively associated with the housing and in communication with the chamber, the pair of pistons operable out of phase with each other for oscillating a gas flow within the chamber. A method is also provided for reducing a temperature of a product in a freezer.

Abstract: According to an embodiment, a refrigeration system that cools a compartment includes a compressor, a condenser, a condenser fan, a condenser fan motor, an evaporator, an evaporator fan, an evaporator fan motor, and tubing adapted to transport refrigerant through the refrigeration system in a circulation order from the compressor to the condenser to the evaporator and back to the compressor again. The evaporator fan may be positioned in an air inlet path to the evaporator. The evaporator fan motor may be outside a chilled air circuit of the evaporator.

Abstract: A refrigerator, in which an evaporator and a cold air fan are horizontally arranged in a cold air generating compartment positioned at an upper portion of the refrigerator. The evaporator and the cold air fan extend along a depth of the refrigerator in forward and rearward directions of the refrigerator.

Abstract: A refrigerating apparatus (100), particularly for home use, is proposed.

Abstract: A mass transit vehicle including a cabin mounted to a frame and including a roof and a passenger zone defining a passenger zone length, an air cleaning unit including an air cleaner housing mounted to the roof, an air cleaning device disposed within the housing, an inlet upstream of the air cleaning device, and an outlet downstream of the air cleaning device, and a duct system disposed within the cabin and extending substantially along the passenger zone length. The air cleaning unit is operable to draw in air through the inlet, through the air cleaning device, and discharge a flow of cleaned air out of the outlet, and the duct system is in fluid communication with the outlet and operable to receive the flow of cleaned air from the outlet and direct the flow of cleaned air to the cabin substantially evenly along the passenger zone length.

Abstract: A reciprocating refrigerant compressor system is disclosed. The compressor system includes a cylinder, a piston disposed within the cylinder, at least one fluid passageway, and an actuator. The piston is movable between a bottom dead center (BDC) and a top dead center (TDC) position. The fluid passageway is disposed within the cylinder between the BDC and TDC position and defined by one or more apertures. The actuator is in operative communication with the aperture and is responsive to an environmental condition external to the compressor system to at least partially close the aperture.

Abstract: A centrifugal fan mounted in an air conditioner has the following relationship: outer diameter of a side plate of the centrifugal fan>outer diameter of the blade rear-edge part on side-plate side>diameter of the blade rear-edge part on main plate side>outer diameter of the main plate. In the centrifugal fan, the blade rear-edge part is positioned inside from a straight line connecting the connection point between the blade rear-edge part and the main plate, to the connection point between the blade rear-edge part and the side plate, as viewed from the rotation axis. The blade rear-edge part has a shape such that the distance from the rotation axis becomes larger from the main plate toward the side plate.

Abstract: An exemplary server system includes a server cabinet, two rows of racks arranged in the server cabinet, a number of servers mounted in the racks and a heat dissipating device. The server cabinet includes two side plates parallel to each other. The servers of each row are evenly distributed between the side plates. A channel is defined between the two rows of racks. The heat dissipating device includes an air conditioner arranged over the racks for generating cooling air and an air guiding mechanism. The air conditioner defines a number of apertures facing the passage. The guiding mechanism includes a number of tubes received in the passage and respectively coupled to the apertures of the air conditioner. Each of the tubes defines a number of air outlets for exhausting the cooling air towards the servers.

Abstract: A container data center includes a container and a number of racks containing a number of computer servers. The racks divide the container into a first space and a second space. The container further includes a heat dissipation system including a first portion. The first portion includes a first intake communicating with the first space, an evaporator, and a first outlet communicating with the second space. The evaporator cools the airflow coming from the first space through the first intake, and the first outlet exhaust the cooled airflow to the second space.

Abstract: An air conditioner includes a body installed at an outdoor space, and an air discharge tube to guide cold air discharged from the body to an indoor space. An evaporator and a condenser are installed in the body. The evaporator is disposed at a higher level than the condenser. Accordingly, it possible to transfer condensed water generated from the evaporator to the condenser by gravity.

Abstract: A refrigerator using a non-azeotropic refrigerant mixture (NARM) and a control method thereof. The refrigerator reduces the rotational speed of a freezing chamber fan or stopping the freezing chamber fan for a designated time, and/or increasing the rotational speed of a compressor in a simultaneous freezing/refrigerating operation mode of an NARM cycle as compared to a freezing operation mode, and may thus decrease evaporation latent heat of a refrigerant consumed by a freezing chamber evaporator and relatively increase evaporation latent heat of the refrigerant usable in a refrigerating chamber evaporator without increase in a charging amount of the refrigerant, thereby preventing over-charging due to increase in the charging amount of the refrigerant and reducing cycling loss.

Abstract: The present disclosure relates to the cooling of electric and/or electronic components, in particular to an electric and/or electronic system with a cabinet, which includes a cabinet housing including a first aperture for receiving a stream of cooling air. The cabinet housing includes a second aperture for releasing the cooling air thereafter in an operating state of the cabinet. At least two modules, which each include a guiding structure with an inlet and an outlet, are provided in the cabinet. The at least two modules are arranged in the cabinet housing such that a branch of the major portion of cooling air flowing through the first aperture of the cabinet housing is enabled to flow into each module via the inlet guided by the guiding structure through the dedicated module to the outlet and thereafter through the second aperture out of the cabinet housing.

Abstract: Disclosed herein is a refrigerator including: a cabinet configured to define a storage space; a barrier configured to divide the storage space into a refrigerating compartment and a freezing compartment and having an heat insulator therein; a depression part formed to be depressed in the barrier for the freezing compartment and configured to accommodate an evaporator and a blowing unit; and a barrier cover configured to shield the depression part for the freezing compartment, wherein the depression part includes an evaporator accommodating part configured to accommodate the evaporator, a blowing unit accommodating part formed to be stepped on a upper side of the evaporator accommodating part and configured to accommodate the blowing unit.

Abstract: A cooling system for a machine room of a refrigerator is provided. More particularly, a cooling system for a machine room of a refrigerator is provided, which is capable of cooling the machine room of the refrigerator using a smaller blowing fan in a nacelle-shaped or nacelle duct, which can acquire more air than using conventional fan blades, remarkably reducing noise of the fan and ensuring sufficient space, thereby efficiently cooling the compressor and the condenser installed in the machine room. The apparatus for cooling a machine room of a refrigerator may include a compressor installed in the machine room, a condenser installed in the machine room and connected to the compressor via a connection pipe, and a nacelle duct installed in the machine room that cools the compressor and the condenser by blowing air, the nacelle duct having a central opening.

Abstract: A refrigeration cabinet has an insulated body comprising a rectangular base with an upstanding front wall, rear wall and end walls interconnecting the front wall and rear wall. The body forms an open-topped product chamber. A clear glass or clear plastics lid is mounted by hinges at a top of the rear wall to close the product chamber whilst at the same time allow customers to view chilled or frozen merchandise on display within the product chamber. At one end of the body a refrigeration unit is provided for generating a climate control cold air stream for circulation through the product chamber in order to maintain the merchandise in the product chamber in a chilled or frozen condition as required.

Abstract: A refrigerator includes a first storage chamber, a second storage chamber spatially-separated from the first storage chamber, a first refrigeration cycle system to cool the first storage chamber using a first refrigeration cycle, and a second refrigeration cycle system installed to be separated from the first refrigeration cycle system to cool the second storage chamber using a second refrigeration cycle in an independent manner from the first refrigeration cycle. The first and second storage chambers maintain first and second target temperatures, respectively. The first and second refrigeration cycle systems circulate different kinds of refrigerants to cool the first and second storage chambers, respectively.

Abstract: A fan motor assembly and a refrigerator having the same are provided. The fan motor assembly may include a cover plate having a cool air suction opening formed therein, and at least one cool air duct flow path formed at an inner side wall of the refrigerator. A blower may be provided at an interior side of the cover plate to direct cool air into the at least one cool air duct flow path.

Abstract: A refrigerator is provided. The refrigerator may include two compressors and two condensers disposed in a machinery compartment. The refrigerator may employ a single fan, also provided in the machinery compartment, to blow air to the two compressors and the two condensers.

Abstract: Provided is a refrigerator. The refrigerator includes a storage space, a barrier main body, an insulator, an evaporator, a fan motor assembly, a barrier cover, and a cooling-air passage. The storage space includes a freezer compartment and a refrigerator compartment. The barrier main body defines the freezer compartment and the refrigerator compartment. The insulator is disposed at a side of the barrier main body to insulate the refrigerator compartment from the freezer compartment. The evaporator is disposed at a side of the insulator to generate cooling air. The fan motor assembly is disposed at an upper side of the evaporator to provide a driving force for circulating cooling air. The barrier cover is configured to cover sides of the evaporator and the fan motor assembly. The cooling-air passage is defined between the insulator and the barrier cover to allow a flow of cooling air generated by the evaporator.

Abstract: A refrigerator includes a cabinet having a storage space; a barrier to divide the storage space into a freezing compartment and a refrigerating compartment, filled with a heat insulator, and having a depression part formed on one side surface thereof; an evaporator accommodated in a part of the depression part; a blowing unit accommodated in another part of the depression part corresponding to a upper side of the evaporator; a barrier cover to shield the depression part by covering one side surface of the barrier. The depression part includes an evaporator accommodating part to accommodate the evaporator, a blowing unit accommodating part configured to accommodate the blowing unit, and a cold air passage extended from the blowing unit accommodating part to allow the cold air to be guided into the freezing compartment and to refrigerating compartment. The blowing unit accommodating part is depressed greater than the evaporator accommodating part.

Abstract: A refrigerator and an operating method thereof are disclosed. The refrigerator includes a refrigerator body having a storage chamber defined therein, a refrigeration cycle device for cooling the storage chamber, a thawing box mounted in the storage chamber, the thawing box having a plurality of air jet holes formed therethrough, a thawing heater mounted in the thawing box for heating a stored object in the thawing box, and a blower mounted at the thawing box for introducing cool air from the storage chamber into the thawing box through the air jet holes such that the stored object is cooled by the air and discharging the air out of the thawing box. The thawing box, the thawing heater, and the blower perform not only a thawing function but also a rapid cooling function, thereby manufacturing the refrigerator in a simple structure at low costs and improving spatial utilization of the storage chamber.

Abstract: According to the present invention, a refrigerator comprises: a main body having a storage compartment; a refrigerating cycle apparatus for cooling the storage compartment; a quick cooling body which accommodates beverages inserted therein, and which has a plurality of jet-colliding holes for jet-colliding the cooling air in the storage compartment against the beverages; a quick cooling air blower which enables the cooling air in the storage compartment to flow toward the quick cooling body such that the cooling air in the storage compartment passes through the jet-colliding holes, is jet-collided against the beverages, and is then discharged to the storage compartment; and a quick cooling body moving mechanism mounted in the main body and connected to the quick cooling body to move the quick cooling body, thereby minimizing the quick cooling time of the beverages.

Abstract: The invention provides a mobile container for cooling produce. The container includes a box-like housing and a plenum wall creating a plenum chamber and a treatment zone. Within the treatment zone, produce can be placed. A plurality of openings are located within the plenum wall to allow conditioning air flow to pass between the plenum chamber and the treatment zone. The openings are of a non-uniform size such that the conditioning air passes from the plenum chamber into the treatment zone through the openings in a substantially uniform manner, allowing the produce to be cooled in a substantially uniform manner.

Abstract: An apparatus for freezing a commodity includes a plurality of boxes arranged in two rows with a space formed therebetween. A cover is provided for sealing the space along the two rows of boxes. A plenum is formed between the two rows of boxes with the plurality of boxes being positioned side-by-side. At least one air handler is positioned to pull air through and/or around the plurality of boxes and through ventilation holes in the boxes and/or through spacers positioned underneath adjacent boxes and along a length of the space formed between the two rows. The air may be discharged upwardly, horizontally or downwardly therefrom. The air may be forced through the at least one air handler, along the length of the space formed between the two rows of boxes and through ventilation holes in the boxes and/or through spacers positioned underneath adjacent boxes for evenly freezing a commodity.

Abstract: A multifunctional ventilating fan comprises a machine body, a panel provided with an air inlet and an air outlet. The machine body includes a first area, a second area, and a third area separated by several partition plates. The first area is provided with a first heat exchanger and a ventilating blower. A exhaust port of the ventilating blower is communicated with the outdoor. The second area is provided with a second heat exchanger and a circulating blower. The third area is provided with a compressor. The air inlet of the panel is communicated with the first area to form a first air path. The air inlet of the panel, the first area, the second area and the air outlet of the panel are communicated in turn to form a second air path. A first valve is provided in the second air path for isolating the first area so that a third air path is formed by the air inlet of the panel, the second area and the air outlet of the panel communicated in turn.