Abstract: A heating and/or cooling system for a dwelling, including a heat exchanger that is located indoors, and ducting that directs rejected air to the attic space or outdoors. The heat exchanger is pre-heated and/or pre-cooled with indoor space air, thereby increasing the efficiency of the system. Additionally, a pair of parallel heat exchangers are mounted in the air path of the air handler that forces air in the indoor space of the dwelling. The parallel heat exchangers are connected to conduit through which refrigerant flows between the first heat exchanger, a compressor and an expansion valve. The parallel heat exchangers are mounted in the air path, and because they are heated or cooled to the same extent, they heat or cool the air blowing through them to a greater extent than a conventional heating and cooling system.

Abstract: An indoor unit of an air conditioner is provided. A width of the indoor unit of the air conditioner may be varied based on whether or not the indoor unit of the air conditioner is operated.

Abstract: Fixed part 21 of a shield panel 20 is fixed to a casing 1 in vicinity of a lower edge of an opening 15. In the shield panel 20, a portion of step part 22 adjoining the fixed part 21, flat part 23 and bent part 24 are placed inside the casing 1. Extremity of the bent part 24 is in contact with an inner side surface of the casing 1 in vicinity of an upper end of the opening 15. Thus invasion of flame into the casing 1 through the upper end of the opening 15 is prevented. Besides, gaps as air circulation paths that are formed between side edges of the opening 15 and the flat part 23 of the shield panel 20 provide ventilation in the casing 1 and improve efficiency of cooling electrical components in an electrical component box 10.

Abstract: An outdoor unit of an air conditioner is provided in which a wind whistling sound and a vibration noise due to airflow are reduced. The outdoor unit includes an outdoor heat exchanger, a fan, a motor for driving the fan, and a motor support table for supporting the motor. The fan moves air on the outdoor heat exchanger to promote heat exchange between refrigerant and air. The motor support table (63) is provided with a rectifying member, and the rectifying member deflects air flowing toward the motor support table in a predetermined direction.

Abstract: An air-cooling type chiller is provided. The chiller may include a plurality of fans, and an intermediate device provided between adjacent fans of the plurality of fans. When one of the fans is disabled, air is not drawn in through the disabled fan due to the intermediate device, but instead may pass through a condenser, thereby minimizing degradation in condensing efficiency. The intermediate device may be formed as an auxiliary condenser so that any air drawn in through a disabled fan passes through the auxiliary condenser, also minimizing impact on condensing efficiency.

Abstract: An air conditioner is provided. The air conditioner includes a main body formed by a plurality of members assembled with each other and an air passage along which air introduced into the main body flows. At least one of the member includes a Kimchi lactic bacterium zymogenic material formed on a portion of the member, which contacts the air flowing along the air passage.

Abstract: An electric vehicle includes a frame having a cab; a plurality of hub wheel motors mounted to the frame, each hub wheel motor rotating a wheel; and an air conditioner mounted on the frame and thermally coupled to the cab, wherein the air conditioner includes an inverter driving an electric compressor and the inverter is coupled to an independent battery for air conditioning.

Abstract: A refrigerant system is provided with a reheat function selectively utilizing the heat rejected by the variable speed drive controller and electronics that are often employed in known refrigerant cycles. By placing at least one of these variable speed drives in the path of air being delivered to an environment to be conditioned, the air is reheated to a desired temperature, after it has been overcooled in the evaporator to provide a desired humidity level. In this manner, the variable speed drive is cooled, and the reheat function is provided, without the requirement of any additional flow structure.

Abstract: An indoor unit of an air conditioner includes a cross flow fan and an indoor heat exchanger. The cross flow fan generates a flow of air. The heat exchanger has a two row part and a one row part. The one row part has an area that is smaller than the two row part, and is disposed so that it overlaps one part of the two row part in an air transit direction. Furthermore, during a cooling operation, a refrigerant flows to the two row part before flowing to the one row part.

Abstract: One embodiment comprises an apparatus with an evaporative unit for a refrigerant having a flow direction opposing the airflow direction and an adjustable airflow rate to utilize to produce both cold/dehumidified exit air and warmed exit refrigerant for high efficiency and to maintain an airflow sufficient to avoid freeze-up of evaporative unit or freeze-up to an extent that blocks the airflow. This may produce low humidity even when the room thermostat is set warm (e.g. 85 F) and 5%-30% lower A/C bills. Other embodiments comprise systems and methods related to the adjustable airflow. A further embodiment comprises a controller to adjust the humidity in an air-conditioned space to produce air, which is both temperature and humidity controlled.

Abstract: A refrigeration apparatus having an evaporator fan motor control includes an evaporator to remove heat energy from the air in a cooled storage space. The evaporator transfers the heat energy to a refrigerant. At least one evaporator fan moves air from the cooled storage space across the evaporator to improve the transfer of heat energy into the refrigerant. The one or more evaporator fans have an energy consumption and generate a waste heat energy. A refrigeration control unit at least controls the operation of the one or more evaporator fans. During an off mode, the one or more evaporator fans are operated in a reduced energy consumption mode to reduce the energy consumption of the one or more evaporator fans and to reduce the waste heat while still defrosting the evaporator in the off mode.

Abstract: A vehicle including a roof that separates an exterior and an interior of the vehicle, and an air conditioning system. The roof has an exterior surface, an interior surface, and an aperture extending through the roof between the exterior surface and the interior surface. The air conditioning system includes an exterior housing that is mounted to the exterior surface of the roof and includes a divider defining a first cavity, and a second cavity. The air conditioning system also includes a condenser, an evaporator, and an evaporator blower. The air conditioning system further includes an interior housing that is removably mounted to the interior surface of the roof and defines a mounted position and a removed position in which the evaporator and evaporator blower are accessible for servicing from the interior of the vehicle.

Abstract: An evaporator assembly through which a refrigerant is circulated to transfer heat out of a volume of air in a housing in which the evaporator assembly is at least partially disposed. The evaporator assembly includes an evaporator in fluid communication with a compressor for compressing the refrigerant, a solenoid valve subassembly for controlling circulation of the refrigerant, a thermostat electrically connectable to the solenoid valve subassembly via a solenoid control circuit, one or more fans for circulating the air in the housing, and one or more fan motors for rotating the fans. Drive voltage supplied to the fan motors is controlled by a fan controller. The fan controller provides a first predetermined drive voltage to the motor drive when refrigerant is circulatable and a second predetermined drive voltage to the motor drive when refrigerant is non-circulatable.

Abstract: A refrigerator is disclosed. A freezing chamber evaporator and a chilling chamber evaporator are installed at an inner side of a partition wall that partitions a freezing chamber and a chilling chamber from each other. Accordingly, the freezing chamber and the chilling chamber have deep depths thus to have large available capacities, thereby freshly receiving a large amount of food items. Furthermore, a cool air channel is formed at the freezing chamber door and the chilling chamber door so as to be connected to a cool air channel of the partition wall. Accordingly, a temperature difference between an inner space and a door basket does not occur, thereby storing food or beverage items received in the door basket with a fresh state.

Abstract: A monolithic air conditioner includes a cabinet, an outdoor heat exchanger mounted on a rear-inner portion of the cabinet and spaced away from a sidewall of the cabinet, a guide member attached on a rear surface of the outdoor heat exchanger, and a fan assembly disposed in the cabinet to introduce the outdoor air. The guide member has an air exhausting guide unit and an air introduction guide unit extending from the air exhausting guide section.

Abstract: A vapor compression system includes a timer and a controller for periodically starting up the system during the off-season periods (primarily non-cooling months) in which the system would normally be shut down. This provides periodic lubrication to the compressor components and prevents severe flooded starts due to excessive accumulation of refrigerant in the compressor (compressor oil sump in particular) and other system components. Provision is also made to sequentially turn on and off system components such as the compressor, the evaporator fan and the condenser fan to enhance the system operation. The timing sequences are provided for the time intervals between the startups, as well as the off-season operation cycle times.

Abstract: A multi-zone HVAC&R system has its control programmed to provide diagnostic testing of air handling components and refrigerant components associated with each climate controlled zone in sequence. The control changes the original position of the corresponding component and a resultant change in a relevant operational parameter is sensed. If the actual change is outside of the tolerance band associated with the expected change, then the determination is made that the component under consideration is malfunctioning. The periodicity of a diagnostic procedure for a particular component is typically defined by its criticality and reliability level. If the change in the corresponding operation parameter is recorded and stored in the database, the component degradation can be observed over time and a prognostic prediction can be made when a particular component requires preventive maintenance or replacement.

Abstract: A heat pump refrigerant system is provided with a pulse width modulation control for a fan moving air over the indoor heat exchanger. When it is determined that there is insufficient heat rejected by the indoor heat exchanger to heat the volume of air being delivered by the fan into the conditioned environment, the volume of air supplied to the conditioned environment is reduced by utilizing one of pulse width modulation techniques to cycle the indoor fan motor to reduce the average volume of supplied air. Therefore, a precise control over the temperature of air delivered to the conditioned space is achieved, temperature of the delivered air is increased to the target value, and so-called “cold blow” conditions are avoided.

Abstract: The invention concerns a heat recycling system comprising at least one exhaust air heat exchanger mounted inside the exhaust air flow of a ventilating and/or air-conditioning plant, especially of a building or a portion of a building, and at least one outside air heat exchanger mounted within the intake air flow of such unit, whereby the heat exchangers are integrated within the circuit, whereby for the production of cold, especially nighttime cold from outside air at least one partial circuit can be segregated from the integrated circuit, in which circuit is mounted one of the heat exchangers, especially an exhaust air heat exchanger, through which the outside air can be channeled in order to cool the fluid in said partial circuit, whereby the partial circuit features at least one heat exchanger, through which the cold so recovered can be channeled into a cooling circuit.

Abstract: A refrigerator having a compressor, a condenser and an evaporator connected in a refrigerant circuit, with the evaporator being forced-ventilated by a fan with adjustable power, the refrigerator including a control unit configured to regulate the power of the fan in inverse proportion to a thermal load of the refrigerator.

Abstract: This invention relates to a method and an apparatus for a modulating air conditioning system having increased energy efficiency and greater turndown capabilities. A modulating air conditioning system includes modulating at least one of the following components: a compressor, a compressor driver, a condenser fan, an evaporator fan, an effective evaporator surface area, an effective condenser surface area and/or an expansion device.

Abstract: A dynamic system controls indoor relative humidity and temperature to achieve specified conditions by applying multiple stages of dehumidification. In addition to a stage that increases dehumidification by reducing the speed of the indoor blower, the system uses a reheat coil and multiple valves that allow the reheat coil to function as either a subcooling coil or a partial condenser. Thus the system can maintain specified indoor temperature and humidity conditions even at times when no heating or cooling is needed. The system may have an outdoor condensing unit including a compressor and a condenser operably connected via refrigerant lines to an indoor unit to form a “split system” refrigerant loop.

Abstract: In a refrigerant cycle system, a compression mechanism of an electric compressor sucks and compresses refrigerant, and an electric motor that drives the compression mechanism is cooled by the refrigerant. A variable throttle mechanism decompresses the refrigerant discharged from the electric compressor. A motor temperature detector detects a temperature of the electric motor. A motor protection determiner determines whether the temperature of the electric motor detected by the motor temperature detector is equal to or higher than a criterion value. A motor protection controller controls the variable throttle mechanism so that an opening degree of the variable throttle mechanism does not decrease when the motor protection determiner determines that the temperature of the electric motor is equal to or higher than the criterion value.

Abstract: Various control methods are disclosed for removing moisture from the external surfaces of an evaporator in a refrigerant system to avoid moisture entering a conditioned space. In one embodiment, the evaporator fan is driven in a reverse direction, and the air is guided to the outdoor environment. In other embodiments, a supplemental exhaust fan is utilized in conjunction with the evaporator fan. Also, a reheat circuit, hot gas bypass circuit, or specific features of a heat pump unit may be utilized to more efficiently perform the moisture removal.

Abstract: An installable HVAC system is used for a vehicle. The HVAC system may comprise: a housing; a compressor; a motor operatively coupled to the compressor; a condenser in fluid communication with the compressor; and a power management controller configured to run the motor with power from a given power source. The compressor, the motor, the condenser, and the power management controller are located within the housing. The housing is configured to attach to an existing HVAC system of the vehicle.

Abstract: Provided is a radiating apparatus of a built-in refrigerator that can improve heat radiation in a machine room of the refrigerator installed in a built-in cabinet. The radiating apparatus includes: a refrigerator body installed in a built-in cabinet; a machine room disposed at a rear lower side of the refrigerator body; a compressor installed at one side of the machine room; a condenser and a blower fan installed at the other side of the machine room; and an airflow guide member installed between the blower fan and the condenser, for guiding a suction of an external air toward the other side of the machine room and guiding a discharge of an air that has exchanged heat in the other side of the machine room.

Abstract: If the degree of opening of an electronic expansion valve (14) is kept below a specified degree of opening or if the degree of superheat of refrigerant at an evaporator (15) side is kept above a specified degree of superheat, the amount of circulating refrigerant is judged to be insufficient. Thus, the volume of an air delivered by an evaporator fan (22) is reduced.

Abstract: There is provided a cooler for heater-containing box in which an outside air fan for carrying air on an outside air path and an inside air fan for carrying air on an inside air path are arranged such that a rotating shaft of each fan is in parallel with an air intake direction, and a heat exchanger for exchanging sensible heat of outside air and inside air is arranged between the outside air path and the inside air path such that a suction port at a longitudinal air-path side of the heat exchanger is aligned with a blowout port of the fan. The cooler for heater-containing box capable of making the depth thinner can be provided.

Abstract: A heat source side controller of an air conditioner has an operating mode allocator and an operating mode setter. The air conditioner has a heat source unit and a plurality of room units. The heat source unit can be switched among a plurality of operating modes having different noise-reduction levels. The operating mode allocator allocates one operating mode to each of the operating room units. The operating mode setter sets the heat source unit to one operating mode from among the plurality of operating modes on the basis of the operating modes allocated by the operating mode allocator to each of the operating room units. In cases in which a specific operating mode is allocated to all of the operating room units, the operating mode setter sets the heat source unit to the specific operating mode.

Abstract: The invention relates to a housing that houses a coiled conduit for a first heat transfer fluid with the housing open at two front sides and surrounding the coil. A wall of the housing that extends in the longitudinal direction of the coil is provided with passages.

Abstract: A heat transfer system is provided having an air-cooled heat exchanger system. The heat exchanger system has an evaporator, condenser, compressor and a fan for forcing air over a heat exchange surface for effecting heat transfer. A mist generator having at least one nozzle directs a stream of fine mist or atomized liquid coolant into the air. The mist generator is coupled to a supply of liquid coolant. A controller controls the degree of mist or atomized coolant generated by the mist generator. A filter element positioned between the at least one nozzle and the heat exchange surface captures droplets of liquid coolant. The at least one nozzle is spaced apart from the filter element for directing the stream directly into the air surrounding the filter element.

Abstract: When during a first action of a refrigeration system the internal cold storage temperature is held at a desired temperature by an evaporator, the refrigeration system performs a second action of increasing the cooling capacity of the evaporator to decrease the internal cold storage temperature. When during the second action the internal cold storage temperature reaches a minimum temperature Tmin, the refrigeration system stops a compressor and performs a third action. When during the third action the internal cold storage temperature reaches a maximum temperature Tmin, the refrigeration system drives the compressor and performs the first action.

Abstract: A refrigerated case (20) has a housing containing an interior volume (36) for storing items. Along an air flow path (510) through the case, a refrigerant-to-air heat exchanger (60) has an evaporator section (112) and a reheat section (114). A preconditioning section (110) may be upstream of the evaporator section (112) and the evaporator section is upstream of the reheat section (114). Along a refrigerant flow path (520), the reheat section (114) is downstream of the preconditioning section (110) (if any) and upstream of the evaporator section (112) and an expansion device (62) is between the reheat (114) and evaporator (112) sections.

Abstract: A personal environment appliance is disclosed in which a person in a localized area can individually control the ambient conditions of the person's localized area. The control permits highly localized adjustment to suit individual preferences, thereby, reducing the impact of individual environmental preferences on the individuals. In addition to environment conditions, a variety of accessories may be provided such as beverage heaters and/or coolers.

Abstract: A method of calculating net sensible cooling capacity of a cooling unit includes measuring a discharge pressure from of fluid from a compressor and a suction pressure from an evaporator, calculating a condensing temperature of fluid flowing from the compressor and an evaporating temperature of fluid flowing from the evaporator, calculating a mass flow rate of fluid flowing from the compressor, calculating enthalpy of fluid flowing from the compressor, of fluid flowing from the thermal expansion valve, and of fluid flowing from the evaporator, calculating a mass flow rate of fluid flowing through the hot gas bypass valve, and calculating net sensible cooling capacity. Embodiments of cooling units and other methods are further disclosed.

Abstract: An air conditioner is disclosed. The air conditioner includes a frame having air suction holes formed at upper and opposite lateral surfaces thereof and an air discharge hole formed at a front surface thereof, a heat exchanger having upper, left and right heat exchanger portions located along the air suction holes, and a fan disposed below the heat exchanger and adapted to suction air from radial and rearward directions thereof and to blow the air in a forward direction.

Abstract: Disclosed herein is a turn-fin condenser. The turn-fin condenser employs a turn-fin tube adhesively wound in a spiral shape around an outer surface of the tube in which refrigerant flows. The condenser comprises a coil type turn-fin tube 10 wound in a coil shape and fixed by inner and outer brackets 20 and 30 surrounding an outer peripheral surface of the coil type turn-fin tube, a motor 40 positioned in an inner space formed by the coil type turn-fin tube 10, a blowing fan 50 for taking ambient air in the coil type turn-fin tube 10 after being driven by the motor 40, and a tube wall 80 spirally wound with tube 11 extending out of the inner and outer brackets 20 and 30 at the rear side of the coil type turn-fin tube 10. The turn-fin condenser is easily manufactured and allows a greater quantity of air contact with turn-fins, thereby enhancing heat exchange efficiency.

Abstract: Disclosed herein is an air conditioner having independent cooling and purifying paths. The air conditioner comprises a body casing formed by assembling a front panel with a rear panel, the front panel having a cooled air discharge opening and one or more suction openings to introduce indoor air into the body casing, a first fan arranged in the body casing to suction air via the suction openings, and a heat exchanger located above the first fan to perform heat exchange of the suctioned air. A cooler housing is arranged in the body casing to receive the first fan therein. Also, an air purifier is mounted in the body casing.

Abstract: A free cooling conditioning device for climate controlling of an enclosed space comprising, inside a box-like containment body, a first main fan for aspirating air from the enclosed/outside space, an evaporator, to which the first fan sends aspirated air to introduce it in the enclosed space, a condenser associated with the evaporator, a second fan for air flow over the condenser, a compressor, associated with the condenser and the evaporator to form a refrigeration circuit for aspirated air cooling, a first shutter, upstream of the first fan, for selecting the air stream aspirated by the first fan, from either ambient air, for a direct-cooling conditioning, or external air for free cooling conditioning, and a second shutter for redirecting the air stream in output from the enclosed space either toward the second fan, in the second free cooling mode, or toward the first shutter, at least partly open toward the first fan, for aspiration of ambient air, in the cooling mode.

Abstract: An upright refrigerator including a cabinet having in a lower position a compartment housing the usual compressor of the appliance refrigeration circuit. The compartment having an aperture at the rear in proximity to a rear wall of the cabinet and the cabinet comprising side walls having portions projecting from the bottom wall of the compartment supporting the compressor towards a surface on which the refrigerator rests. The cabinet having a cavity defined by the side walls of the cavity and the lower wall of the cabinet, between the lower wall and the bottom wall of the compartment there is a lower aperture below the usual door of the refrigerator, the lower aperture communicating with the aperture of the compartment. A filter member is removably positioned in the cavity to retain the impurities present in the air entering from the aperture of the lower wall of the cabinet and directed towards its rear aperture.

Abstract: A cooling system cools the air for a cab of a vehicle. The system includes a compressor and/or an evaporator, a condenser, an air guidance system and connecting lines. The condenser can be connected with the compressor or the evaporator by means of the connecting lines. Air for the cooling of the condenser can be conducted to the condenser by means of the air guidance system. The condenser installed in a limited or reduced construction volume and is located close to the cab without increasing the dimensions of the engine hood.

Abstract: A built-in type compressor/condenser unit for an air conditioner with an efficient installation structure for installing an increased capacity outdoor unit is provided. The built-in type compressor/condenser unit includes a louver frame installed on a rectangular shaped space formed on an outer wall of a building. The louver frame is divided into a suction area and a discharge area, each with a plurality of louver blades. The compressor/condenser unit casing is positioned proximate the louver frame, with the surface of the casing which faces the suction area and the discharge area of the louver frame open, and the remaining surfaces of the casing closed. A compressor, an air-cooled condenser, and a cooling fan are installed in the compressor/condenser unit casing.

Abstract: It is an object of the present invention to provide a refrigerant cycle apparatus which can optimize the capability of releasing heat from a refrigerant in a gas cooler and an auxiliary heat exchanger under use conditions at a low cost. There are provided an intermediate cooling circuit which once releases heat from a refrigerant discharged from a compressor and then returns the refrigerant to the compressor, and a fan which ventilates an inter cooler of the intermediate cooling circuit and a gas cooler. The inter cooler has substantially the same ventilation area as that of the gas cooler.

Abstract: Disclosed is a refrigerator comprising: a compressor installed in a machine chamber for compressing refrigerant of low temperature and low pressure into refrigerant of high temperature and high pressure; a condenser upright installed at one inner side of the machine chamber for heat-exchanging the refrigerant which passed the compressor with external air of the machine chamber; and a cross flow fan upright installed near the condenser for sucking air and cooling the condenser.

Abstract: A built-in type compressor/condenser unit for an air conditioner is provided which prevents re-suction of discharged air. The built-in type compressor/condenser unit includes a louver frame which is installed on an inner portion of an outer wall of a building, and which divided into a suction area and a discharge area each having a plurality of louver blades. A compressor/condenser casing is installed in contact with the louver frame, having its surface facing the suction area and the discharge area of the louver frame opened and the other surfaces closed. The compressor/condenser unit is divided into a suction unit and a discharge unit corresponding to the suction area and the discharge area of the louver frame. The louver frame includes an isolating means for isolating air between the suction area and the discharge area so as to prevent air discharged from the discharge unit thought the discharge area from being re-ingested into the suction unit through the suction area of the louver frame.

Abstract: A refrigerator which has a pleasant front appearance by improving a structure to circulate air through a machine room thereof, and which restrains a transmission of operational noise from an interior to an outside of the machine room, thus performing a silent operation. The refrigerator has a cabinet defining a storage compartment therein, and a machine room defined at a top of the cabinet. The machine room is partitioned in an interior thereof into front and rear chambers by a noise buffering plate having a plurality of vent holes. A main inlet hole and a main outlet hole are provided side-by-side at an upper surface of the front chamber of the machine room so as to allow air to circulate through the machine room. A compressor, a condenser and a cooling fan are installed in the rear chamber of the machine room.

Abstract: A pipe structure of an air conditioner, wherein the pipes inside the machinery room are concentrated on one side of the compressor to form long up-down direction so that the pipes inside the machinery room of the air conditioner may be formed in a compact manner, is provided.

Abstract: The present invention discloses a built-in type outdoor unit for an air conditioner including: a louver frame being fixedly installed on a rectangular space inner wall formed on an outer wall of a building, being divided into a suction area and a discharge area, including a plurality of louver blades in each area, and sucking and discharging air through gaps between the louver blades; an outdoor unit casing being formed in a rectangular parallelepiped shape, being fixedly installed on the inside bottom of the building to contact with the louver frame, and having its one surface facing the suction area and the discharge area of the louver frame opened and the other surfaces closed; and means installed on at least one of the facing surfaces of the louver frame and the outdoor unit casing, for preventing external leakage of air between the louver frame and the outdoor unit casing.

Abstract: A refrigerating unit including a base, a heat exchanger, and a shroud attached to the base The heat exchanger may have opposite side edges defined by a pair of substantially cylindrical headers, at least one of the headers having an inlet tube or an outlet tube extending, and a substantially rectangular shroud attached to the base and being provided with notched corners. The shroud has a top surface with at least one elongate boss, and integrally-formed resilient gripping portions which capture the heat exchanger headers. The heat exchanger is mounted to the base through engagement with the shroud, clearance is provided between a shroud notched corner and the inlet or outlet tube, and the boss provides a means for supporting the shroud when placed upside down.

Abstract: A stand-type air conditioner including a casing having at least two air discharge openings and an air suction opening, and a blower fan installed therein. Also included are at least two heat exchangers positioned adjacent to the air discharge openings, respectively, in the casing for exchanging heat with air to be discharged through the air discharge openings. Further, at least one of the air discharge openings is located at a lower portion of the casing in the vicinity of the ground for discharging air near the ground. By discharging cold air from an upper side during the cooling operation and hot air from a lower side during the heating operation, the cold air or the hot air can be evenly distributed to the room. Accordingly, uniform cooling/heating can be realized to thereby significantly increase reliability and efficiency of a product.