Abstract: A discharge muffler includes a muffler container. In the muffler container, refrigerating machine oil is separated from refrigerant gas containing the refrigerating machine oil, and the refrigerating machine oil is stored in a lower space. An inlet of an outlet pipe connected to the muffler container opens in the lower space.

Abstract: An Electronically-Controlled Register vent (ECRV) that can be easily installed by a homeowner or general handyman is disclosed. The ECRV can be used to convert a non-zoned HVAC system into a zoned system. The ECRV can also be used in connection with a conventional zoned HVAC system to provide additional control and additional zones not provided by the conventional zoned HVAC system. In one embodiment, the ECRV is configured have a size and form-factor that conforms to a standard manually-controlled register vent. In one embodiment, a zone thermostat is configured to provide thermostat information to the ECRV. In one embodiment, the zone thermostat communicates with a central monitoring system that coordinates operation of the heating and cooling zones.

Abstract: A vehicle air conditioning unit includes: a slide door which controls an opening ratio of an opening allowing an air stream to flow therethrough; a deflection suppressing portion which suppresses a deflection of the slide door by pressing the slide door; and a vibration suppressing portion which suppresses the amplitude of a vibration of the slide door generated when the slide door is exposed to the air stream.

Abstract: A heat pump apparatus that can easily prevent noise generated during partial-load operation is provided. The heat pump apparatus includes a centrifugal compressor configured to compress a refrigerant; a condenser configured to condense the compressed refrigerant; an expansion valve configured to adiabatically expand the condensed refrigerant; an evaporator configured to vaporize the adiabatically-expanded refrigerant; a container into which the vaporized refrigerant flows and from which the refrigerant that flowed in flows out to the centrifugal compressor; a sound-insulating member configured to cover the container and prevent sound generated inside the container from leaking outside; a bypass channel configured to guide part of the refrigerant from an area between the centrifugal compressor and the condenser to the container; and a flow control valve configured to control the flow rate of the refrigerant flowing through the bypass channel.

Abstract: A vehicular refrigeration cycle apparatus where, at the time of startup before starting the operation of a compressor, the speed of a condenser-use blower which blows outside air toward the condenser is increased in accordance with the air-conditioning load. Due to this, the operating noise of the condenser-use blower familiar to the users becomes masking noise helping to prevent the operating noise of the compressor from being heard by the user and the unfamiliar operating noise of the compressor can be kept from being heard by the user.

Abstract: The within invention relates to a refrigerating and/or freezing device with at least one coolant circuit that has at least one condenser, where at least one absorber is provided that is located such that it diminishes or prevents the transfer of oscillations from the condenser to other parts of the refrigerating and/or freezing device and/or oscillations from the condenser itself.

Abstract: A damper blade is moved within an air control module connected to the discharge of a high-velocity blower, thereby modulating the electric power consumption of the blower motor.

Abstract: A two-stage cascade refrigeration system is provided having a first refrigeration stage and a second refrigeration stage. The first refrigeration stage defines a first fluid circuit for circulating a first refrigerant, and has a first compressor, a condenser, and a first expansion device that is in fluid communication with the first fluid circuit. The second refrigeration stage defines a second fluid circuit for circulating a second refrigerant, with the second refrigeration stage having a second compressor, a second expansion device, and an evaporator that is in fluid communication with the second fluid circuit. A heat exchanger is in fluid communication with the first and second fluid circuits to exchange heat between the first and second refrigerants. At least one of the first or second compressors is a variable speed compressor.

Abstract: The subject system combines a sound generating controller device with a domestic air conditioning unit. The sound controller synchronises the speed and direction of the airblower and directional airflow vanes, thus being able to simulate a variety of natural environments. The integration of a sound generation device, and the further synchronisation of these sounds with the operation of the airflow speed and directional controls on the air conditioner, are distinguishing features of this system proposal. An active noise canceller is optional, to further eliminate unwanted external noises.

Abstract: A discharge pipe for connecting a compressor with a condenser in a vapor-compression system comprises an intake segment, a muffler, a splitter segment and first and second discharge segments. The intake segment is configured to connect to a discharge port of the compressor and receive compressed refrigerant flow. The muffler is connected to the intake segment for attenuating pulsations within the compressed refrigerant flow. The splitter segment is connected to the muffler and configured to divide the compressed refrigerant flow into first and second branches. The first discharge segment connects to the splitter to receive the first branch and is configured to connect to the condenser at a first position.

Abstract: An air conditioning system, comprising: a channel to carry a flow of refrigerant, and a first noise reducer to change at least one property of the refrigerant as the refrigerant flows through the channel.

Abstract: An air conditioner has a controller that controls the operation of a refrigerant circuit that has a compressor, a condenser, an expansion valve or orifice tube, and an evaporator. The condenser receives a compressed refrigerant from the compressor and condenses the refrigerant to either a liquid phase or a saturated liquid-vapor phase. The condensed refrigerant is then passed through the expansion valve or orifice tube to expand the refrigerant and to delivery the refrigerant to the evaporator. When the compressor is first started, various sounds and vibrations are created that may be unpleasant to humans. Also, if the engine is cold, then the compressor may have liquid refrigerant that can increase the torque needed to start the compressor. The controller pulses the compressor between ON and OFF operating states to reduce or eliminate these sounds and/or manage the start up torque of the compressor.

Abstract: A refrigeration system includes a compression mechanism, a radiator, an expansion mechanism, an evaporator and a ?-type silencer 20. The ?-type silencer includes a first silencing space, a second silencing space and a first communication path. The first communication path allows the first silencing space and the second silencing space to be communicated. Additionally, the ?-type silencer is incorporated in at least one of a section between a refrigerant discharge side of the compression mechanism and an inlet side of the radiator, and a section between an outlet side of the evaporator and a refrigerant suction side of the compression mechanism.

Abstract: A valve assembly for an air conditioning system includes a liquid line port pressurized at a discharge pressure, an evaporator inlet port pressurized at a suction pressure, a sequence valve for controlling a first flow path between the liquid line port and an outlet in response to a differential between the discharge pressure and the suction pressure, and a thermostatic expansion valve that includes an actuator and an expansion valve member for controlling a second flow path between the outlet and the evaporator inlet port in response to a pressure differential across the actuator.

Abstract: A cooling device, in particular for a switchgear cabinet with a housing, in which a refrigeration cycle system is housed, wherein the refrigeration cycle system has vibration-generating elements, namely a compressor and at least one fan. The fan and the compressor are supported in the housing via vibration dampers. For preventing vibratory emissions a cooling device in accordance with this invention has the fan and/or the compressor separately supported by first vibration dampers on an intermediate bracket, or together on an intermediate bracket. The intermediate bracket is supported by second vibration dampers on a bracket, and the bracket is connected to the housing.

Abstract: A refrigeration system includes a first refrigerant passage, a ?-type silencer, and a second refrigerant passage. The ?-type silencer has a first silencing space, a second silencing space, and a communication path. The first silencing space communicates with the first refrigerant passage. The second silencing space is disposed below the first silencing space. The communication path extends from the lower end of the first silencing space to the outside of the first silencing space and communicates with the second silencing space. The second refrigerant passage extends from the lower end of the second silencing space.

Abstract: A modular cooling tower that serves to cool down cooling water or condense coolant. The modular cooling tower has a greatly reduced height, is easily transported and installed as a finished product, prevents damage and has an improved aesthetic appearance because components are installed inside a casing, efficiently circulates cooling water and air into a heat exchanger unit without a bypass flow, ensures excellent heat exchange performance by preventing the recirculation of exhaust air, makes it easy to inspect and repair components inside the modular cooling tower, is easily installed in a multi-stage structure on the roof of a building, makes the upper space of the modular cooling tower to be used, and makes it easy to install a cover wall and covering members that cover the modular cooling tower.

Abstract: A compressor has a suction port, a discharge port, and an economizer port. A condenser is downstream of the discharge port. An evaporator is upstream of the suction port. An expansion device is between the condenser and the evaporator. An economizer is between the condenser and the evaporator. An economizer line extends from the economizer to the economizer port. A resonator is located in the economizer line and has a first branch and a second branch. A first flowpath length across the resonator through the second branch is longer than a second flowpath length across the resonator through the first branch.

Abstract: An air conditioning apparatus is provided whereby the pressure pulsation generated by a compressor can be entirely reduced both during cooling and during heating, and a muffler can be shared. The air conditioning apparatus has a refrigerant circuit. The refrigerant circuit is configured so that a compressor for compressing a refrigerant, an indoor heat exchanger, an outdoor heat exchanger, and a four-way switch valve are connected via a refrigerant pipe. The four-way switch valve switches the flow of refrigerant compressed by the compressor to either the indoor heat exchanger or the outdoor heat exchanger. The air conditioning apparatus further includes a pressure pulsation reducing component. The pressure pulsation reducing component is provided between the four-way switch valve and the indoor heat exchanger. The pressure pulsation reducing component reduces pressure pulsation inside the refrigerant circuit. The pressure pulsation is generated by the compressor.

Abstract: Disclosed is a refrigerator having a noise reduction structure. According to the refrigerator, a branch pipe for reducing the intensive noise occurring from an impeller part is provided to a discharge pipe connected so that the refrigerant is discharged in a direction of a condenser from the impeller part. Therefore, the traveling sound wave of the noise traveling along the discharge pipe and the reverse sound wave traveling toward the branch pipe provided to the outer periphery of the discharge pipe meet each other, so that the both sound waves are cancelled to reduce the noise.

Abstract: An air conditioner includes a cabinet configured to define an outer appearance of the air conditioner. The air conditioner also includes a front panel coupled to the cabinet and having an intake hole. The air conditioner further includes a fan assembly positioned within the cabinet and configured to guide a flow of air in the cabinet. The air conditioner further includes an intake panel configured to move to open or close the intake hole in response to a control signal. In addition, the air conditioner includes at least one noise reducing part positioned in the intake panel and configured to reduce a noise having at least one frequency bandwidth.

Abstract: A suction silencer in a compressor is disclosed, including a lower shell having an opened top, that draws refrigerant, and an upper shell fixed to the top of the lower shell to form an inside space that reduces noise of drawn refrigerant, and that discharges refrigerant in a direction different from a flow direction of the refrigerant introduced into the lower shell, thereby simplifying a structure to permit easy assembly.

Abstract: Provided is an indoor unit of an air conditioner. The structures of the indoor unit, such as the relationship between an inlet and an outlet, the shape of a rear guide, and the relationship between the outlet and a vane, are improved. Therefore, the airflow of the indoor unit is stable, and the noise level of the indoor unit is low.

Abstract: The invention refers to a resonator arrangement for the cabinet of a refrigeration appliance, said cabinet defining a housing and carrying, in the latter, a compressor presenting a hermetic casing and a defrost water evaporating tray comprising: a bottom wall, to be seated onto an upper portion of the casing of the compressor; and a peripheral wall superiorly projecting from the bottom wall, at least one of the peripheral wall and bottom wall of the evaporating tray carrying a noise absorbing means turned to a noise generation region in said housing and being dimensioned to define a certain reactive impedance and a certain dissipative impedance in the medium of the housing for a determined frequency band.

Abstract: A refrigerator s provided that includes a cooling chamber and an ice maker arranged in the cooling chamber. The ice maker is equipped with an ice container for accommodating the prepared ice. The ice container has a water-draining surface configured for draining water from the prepared ice.

Abstract: An air conditioner has an air conditioning unit for conditioning air to be introduced into a passenger compartment. The air conditioning unit has an air passage, an air conditioning case defining at least a part of the air passage and a noise absorbing member having a multi-layer structure. The noise absorbing member defines at least a part of the air passage. The noise absorbing member has an unbreathable middle layer, a first noise absorbing layer on an inner side of the middle layer and a second noise absorbing layer on an outer side of the middle layer. The second noise absorbing layer has a hardness greater than that of the first noise absorbing layer to maintain the shape of the noise absorbing member. Also, an air conditioner duct is formed of the multi-layer structure.

Abstract: The invention relates to a vortex tube (1) for the generation of cold air. The vortex tube comprises a tube body (2) with a wall (5), the inner wall surface (6) of which forms a channel (7) with a circular-cylindrical cross section. A vortex generator (8) is arranged in a first end (9) of the channel (7) and a flow limiting body (10) is arranged in a second end (11) of the channel (7). One or several outlet/s (12) for hot air is/are arranged at the second end (11) of the channel (7). The vortex generator (8) has an opening (13) through which cold air may leave the channel. A conduit (14) for the supply of compressed air to the vortex generator (8) runs through the wall (5) of the tube body (2) in parallel with the inner channel (7) from a rear end (3) of the tube body (2) up to an inlet (15) to the vortex generator (8).

Abstract: The position of a damper is changed over to switch over the cooling mode between an inside air intake mode and an A/C intake mode. In the inside air intake mode, the air inside a passenger compartment of a motor vehicle is taken in and directly blown to a battery by the operation of a battery blower fan. In the A/C intake mode, the air cooled down by an air conditioner (evaporator) is taken in and blown to the battery by the operation of the battery blower fan. When the detected vehicle speed V is not lower than a preset reference speed Vref, the position of the damper is immediately changed over (steps S240 to S260). When the vehicle speed V is lower than the preset reference speed Vref, on the other hand, the operation amount of the battery blower fan is restricted to a preset limit level Qlim, prior to the changeover of the position of the damper (steps S220 to S260).

Abstract: An air conditioning system including a first communication line, a second communication line, and at least one common power supply line coupling an indoor unit and an outdoor unit. The indoor unit including at least one of a first communication circuit and a second communication circuit, the first communication circuit configured to communicate through the first and second communication lines independent of the at least one power supply line, and the second communication circuit configured to communicate through the at least one power supply line and one of the first and the second communication lines.

Abstract: An ejector-type air-conditioning and refrigerating system according to the present invention is mounted on an automotive vehicle. The system includes a first evaporator for cooling a passenger compartment and a second evaporator for cooling a refrigerator mounted on the vehicle. Refrigerant is supplied to the first evaporator through an ejector, while the refrigerant is supplied to the second evaporator through a restrictor disposed in a branch passage. Refrigerant evaporated in the second evaporator is sucked by a sucking portion provided in the ejector through a sucking passage. A noise dissipater for suppressing noises caused by pulsating vibrations generated in the ejector is disposed in the sucking passage at a position close to the sucking portion of the ejector. The noise dissipater is postured in the sucking passage so that liquid components in the refrigerant including oil contained in the refrigerant are prevented from being retained in the dissipater.

Abstract: A portable casing includes a body that has first, second, third and fourth sidewalls defining a cavity therebetween. The body has open top and bottom surfaces spanning along a cross-section thereof. The body has an outer layer formed from foam material and an inner layer that has an egg-crate shape and is statically abutted to the outer layer. The inner layer is formed from fire-retardant material. A lid is removably attached to the body top surface. A water impermeable outer canvas is formed from flexible material for being gathered and stretched along the sidewalls. A mechanism is included for ventilating heat emitted by the generator. Stakes are passed through the lid and the bottom surface of the body, anchoring the body to the ground. Tie-down straps are connected to the stakes, assisting a user to remove the stakes from the body.

Abstract: A suction muffler for a refrigeration compressor, comprising a hollow body defining at least one dampening chamber that carries a gas inlet duct and a gas outlet duct presenting an inlet opening and an outlet opening, for communicating the interior and the exterior of the dampening chamber, at least one of the gas inlet and gas outlet ducts presenting at least one closed end, one of the inlet and outlet openings being positioned at a certain distance from said closed end, smaller than the distance of said opening in relation to the other opening of the same duct and in a region of the latter presenting a minimum acoustic pressure for a determined frequency, the dimensioning of said duct and of the cross section of the first of said openings being achieved so as to minimize the gas pulsation noises inside the suction muffler.

Abstract: A cryostat assembly comprises a liquid coolant containing vessel; a mechanical cooler having at least one cooling stage located above the vessel; and a channel for conveying gaseous coolant from the vessel to the cooling stage where the coolant is condensed in use and then returns through the channel to the vessel. An acoustic wave attenuator is located in the channel for attenuating the passage of acoustic energy originating from the mechanical cooler and propagating through the gaseous coolant, while permitting flow of gaseous coolant to the cooling stage and flow of condensed coolant to the vessel.

Abstract: A device for reducing sound from an air treatment unit includes, in one embodiment, an air treatment system, including a wall mount HVAC unit with a supply air opening and a return air opening. A supply air sound reducer is provided in communication with the supply air. The supply air sound reducer includes a housing defining a supply interior provided with sound reducing material. The sound reducing material is overlaid with a layer of perforated material. A return air sound reducer is provided in communication with the return air opening. The return air sound reducer includes a housing defining an interior return volume provided with sound reducing material applied to one or more inside surfaces of the interior return volume and a layer of perforated material disposed over the sound reducing material. Mid-structure including sound reducing material is disposed in each of the supply and return air assemblies.

Abstract: In an axial flow fan, for reducing fluid noise and further reducing the noise by suppressing solid-conveyed noise (structure-borne noise) generated by the vibration of an electric motor or the like, the axial flow fan is equipped with a propeller, a motor for driving the propeller, and a venturi portion disposed on the outer circumference side of the propeller and provided on its inner circumferential side with a bellmouth through which an air flow generated by the revolution of the propeller passes, wherein the bellmouth has an intake portion whose diameter contracts in a curved shape in the direction of the air flow, a cylindrical portion having a cylindrical shape, and a discharge portion whose diameter slantingly expands in the direction of the air flow.

Abstract: A refrigerant system (20) is provided with an enlarged chamber (32) that provides the functions of both an oil separator and a muffler. The chamber includes an oil return line (34) that returns separated oil back to a compressor. The chamber further includes at least one sound-deadening feature such that the chamber will also deaden the sound caused by the compressed refrigerant as it moves downstream from the compressor towards the condenser. In one embodiment, the sound-deadening feature is a torturous path (40) for the compressor discharge flow. In another embodiment, the sound-deadening feature is a sound-deadening material (52) formed within the chamber. Additional oil separation features may include an oil retention mesh (36) or a cyclone structure (102).

Abstract: A cooling system configured to cool an interior of an enclosure includes a cabinet, and a vortex tube secured within the cabinet. The cabinet defines a venting chamber. The vortex tube includes a hot pipe within the venting chamber, and a cool gas delivery pipe extending outwardly from the cabinet. The cool gas delivery pipe is configured to deliver cold gas to the interior of the enclosure. A dampening sleeve may be secured around at least a portion of the hot pipe, such that the dampening sleeve dampens noise produced by the vortex tube. Additionally, at least one dampening sheet may line at least a portion of the interior and exterior surfaces of the cabinet.

Abstract: The invention relates to a vertical evaporating plate for refrigerating a refrigerator or freezer comprising a roll bond circuit which consists of refrigerant flow channels and comprises descending and ascending sections, wherein at least a part of the channels of the descending section comprise a liquid refrigerant accumulating area of a maximum height (hi), the totality of the heights (hi) is adjustable in such a way that the total volume of the accumulating areas is equal to or greater than half the volume of the liquid refrigerant and each height (hi) is less than 70% of the entire height of a channel (Hi). The inventive plate makes it possible to improve the thermal efficiency and reduce the sound level of a refrigerator or freezer.

Abstract: A muffler for a hermetic rotary compressor including a muffler body forming a plurality of noise reducing spaces in which refrigerant gas flows; a discharge port formed on the muffler body so as to be located on the nose reducing spaces side; and a guide cover coupled to an inner wall of the muffler body in radial direction for guiding the refrigerant gas flowing in the noise reducing spaces to be discharged to the discharge port, and therefore the noise generated during the discharge of the compressed refrigerant gas to inside a sealed chamber, and a flow resistance for the discharged refrigerant gas is reduced, whereby the electric power consumption is reduced, and the structure and assembling processes can be simplified.

Abstract: In an injectable two-staged rotary compressor, a second suction pipe includes a heat-exchange promoting unit that promotes heat exchange between intermediary-pressure injected refrigerant and internal space or an external surface of a sealed container. The heat being exchanged by the intermediary-pressure injected refrigerant absorbing heat.

Abstract: A muffling apparatus (100) is provided for placement within an oil separator of refrigeration or cooling system, wherein the apparatus has a non-straight shape and a lumen (160) defined therein to allow for noise-creating pressure pulsations/waves to come into contact with absorbing material (110) of the muffling apparatus in order to attenuate the energy of the pressure waves/pulsations into heat and thus reduce oil separator vibrations caused thereby.

Abstract: A turbulence creating energy saving device which is installed on top of the air conditioner or refrigeration condenser or cooling tower. The device directs the hot air leaving the condenser or cooling tower straight up forcing the hot airflow through a series of fixed blades, causing the air to spiral creating a turbulence, thereby increasing the amount of air flowing through the cylindrical tube, in turn moving a larger amount of air through the condenser. The condensers function is to dissipate heat and requires as much air as possible flowing through it in order to do so. The top of the device has a cowling with a reduced output diameter to reduce the output noise level. Many condensers and cooling towers are installed in confined areas where airflow is insufficient to cool the unit efficiently, therefore must run much longer, wasting electricity and shortening the life expectancy of the condenser or cooling tower.

Abstract: An expansion valve includes a valve body having a valve body hole, a first passage, a bottomed valve chamber, a second passage, a third passage and a guide member disposed in the valve body hole between the first passage and the third passage. The valve body hole has a first valve body hole portion and a second valve body hole portion of different diameters forming a valve body step between the second passage and the first passage. The guide has a first guide portion and a second guide portion of different diameters forming a guide portion step. The guide is sized to be slidably received by the valve body hole in a close-fitting relationship with the first valve body hole portion receiving the first guide portion, the second valve body hole portion receiving the second guide portion and the valve body step and the guide portion step contacting each other.

Abstract: A problem to be solved by the present invention is that the temperature of a refrigerant discharged from a compression section can be detected more exactly without being influenced by variable factors existing around the compression section. In a rotary compressor 1 having a motor 6 and a compression section 3 provided in a closed container 2, and also having a discharge pipe 26 provided in an upper part of the closed container 2 to discharge a refrigerant compressed by the compression section 3 to the outside of the closed container 2, a refrigerant discharge part 462 for discharging the refrigerant compressed by the compression section 3 toward the inner peripheral surface of the closed container 2 is provided, and a discharge temperature sensor 20 for detecting the discharge temperature of compressed refrigerant is arranged in a portion opposed to the refrigerant discharge part 462 on the outer peripheral surface side of the closed container 2.

Abstract: The invention relates to a refrigerant compressor provided with a muffler for an air conditioning unit in a vehicle, wherein the refrigerant compressor includes a swash plate or pivoting ring rotatably supported in a casing of the refrigerant compressor for driving axially moving pistons arranged in cylinders, a suction side provided with an inlet channel and an inlet chamber, and a pressure side provided with an outlet channel and an outlet chamber. The muffler including a partition wall having a plurality of apertures formed therein is disposed in at least one of the suction side and the outlet side of the casing.

Abstract: A repositionable attenuator for a terminal unit in a heating, ventilation, and air conditioning system is disclosed. The attenuator is positionable between at least a first and a second position. This enables the attenuator to be attached to and shipped with the terminal unit prior to installation of the terminal unit.

Abstract: A method and apparatus for reducing noise levels occurring at a particular frequency in an air distribution apparatus used with an automotive vehicle having an interior compartment. The apparatus includes a noise reduction structure located in the air duct between an inlet end connected to a housing and a discharge end located in the vehicle interior compartment. The noise reduction structure is located a position spaced between the housing and the interior compartment of the automotive vehicle. The particular position of the noise reduction structure is determined based on the frequency of the noise level sought to be reduced. The method includes measuring the frequency of the noise level emitted from the discharge end of the air duct and correspondingly positioning the noise reduction structure at a spacing or distance based on the measured frequency.

Abstract: An electric unit, such as a room thermostat has a circuit board and an electromechanical switch mounted to the circuit board. The circuit board and the electromechanical switch are housed in a casing. The casing is filled with a sound insulation material with the electromechanical switch embedded in the sound insulation material in order to dampen the click sound produced by the communication of the electromechanical switch.

Abstract: Disclosed is a vibration reduction type refrigerator including a refrigerator main body having a cooling chamber for storing foods and a mechanical chamber, a compressor disposed in the mechanical chamber, for compressing refrigerants, and a suction pipe connected to the side of the compressor, disposed in the mechanical chamber in the width direction of the refrigerator main body, and connected to an outlet pipe of an evaporator disposed at one side end of the mechanical chamber. The vibration reduction type refrigerator can prevent the vibration generated by the compressor from being transmitted to the refrigerator main body through the suction pipe and the discharge pipe connected to the compressor, by minimizing spaces occupied by the suction pipe and the discharge pipe in the mechanical chamber and increasing the length of the suction pipe and the discharge pipe.

Abstract: An integrated noise and heat management system for the management of noise and heat around a heat and noise source is described. The system includes an enclosure for surrounding the heat and noise source, the enclosure having a double wall structure defining an air space within the double wall structure. The double wall structure contains a heat exchange system in heat exchange contact with the air space and the heat source that enables the transfer of heat from the air space to the exterior of the enclosure and is doubly effective in attenuating noise from the noise source to the exterior of the enclosure.