Abstract: Disclosed herein are compositions comprising lithium bromide, water, and at least one ionic compound. These compositions are useful as working fluids in absorption cycle systems. The ionic compound additive has been demonstrated to reduce crystallization in such absorption cycle systems.

Abstract: The present invention discloses a ventilation system for tunnel engineering. The ventilation system is for use in a tunnel having at least one first shaft and at least one second shaft. The ventilation system includes a heat collecting device, a cooling device, and at least one piping system. The piping system is connected to the heat collecting device and the cooling device. A portion of the piping system coils inside the first and second shafts. Increasing the temperature in the first shaft and/or decreasing the temperature in the second shaft introduces ambient air into the tunnel via the first and second shafts by natural convection, thereby decreasing and maintaining the temperature in the tunnel and renewing air therein. The ventilation system advantageously features low power consumption and low manufacturing costs and is fit for use in long-distance tunnel engineering that requires multi-point installation of the ventilation system.

Abstract: A system of a low-pressure ammonia-water absorption chiller/heat pump combined with a thermal mass as a source of liquid coolant. The low-pressure ammonia-water absorption chiller/heat pump has a ratio of generator pressure to absorber pressure which is preferably not more than 2:1, and may include a condensate sub-cooler heat exchanger with a separate coolant supply. The thermal mass may be a swimming pool, a geothermal system, or a cooling tower, for example. Combined with an electrical power production device such as photovoltaic solar collector panels, or a fuel cell; the combined system produces residential electrical power generation along with residential space heating and cooling, thereby providing a residential BCHP (Building cooling, heating, and power) system having a very low carbon footprint and a high operating efficiency, such as measured by heat pump COP (Coefficient of Performance).

Abstract: A working medium for refrigeration processes comprising at least one sorbent material and at least one refrigerant, characterized in that the sorbent material contains at least one nonvolatile organic salt which is liquid under standard conditions, or a mixture of organic salts, with the proviso that this is liquid under standard conditions, wherein the salt or the mixture has a thermal stability above 150° C.

Abstract: A heat pump including: a refrigerant accumulator in which a substance accumulating a refrigerant is disposed, the refrigerant accumulator having a heating means heating the substance in order to release the refrigerant; a flow path connected at one end thereof to the refrigerant accumulator, the flow path holding the refrigerant released from the substance in the refrigerant accumulator by capillary action; a first heat exchanger provided between the refrigerant accumulator and the flow path or around the flow path and exchanging heat with the refrigerant in order to condense the refrigerant; and a second heat exchanger provided around the flow path and exchanging cold energy generated by evaporation of the refrigerant from the other end of the flow path.

Abstract: A vacuum sorption apparatus includes a first volume region (1) in which a sorber (2) which periodically sorbs or desorbs a refrigerant and a condenser (3) are located, and a second volume region (4) located below the first, in which an evaporator (5) is located, wherein a separating body (6) is located above the evaporator (5) to minimize a free surface area of the liquid refrigerant. The separating body (6) is configured to be vertically movable to compensate for different filling level heights of the refrigerant.

Abstract: The present invention provides an improved control system and method for the absorption refrigeration process. The system includes sensors that measure the absorption process in order to determine if the absorption cycle is continuous. A control unit in communication with the sensors which compares the measured sensor values to predetermined safe limits. When the control unit determines that safe limits have been exceeded, the control unit communicates with actuators adjusting the absorption cycle heat source, ultimately protecting the absorption refrigeration process from damage. Further, the control may reestablish the absorption cycle heat source when predetermined safe operation conditions are detected.

Abstract: An energy system for a processing or manufacturing facility is considered a cascading system, as it sequentially utilizes the output product or waste of higher energy processes as at least part of the input energy for lower energy processes. Multiple absorption chillers are incorporated throughout the system along the cascading process stages to step-down the energy in the output product of one stage to at or near the appropriate input energy level for a subsequent stage. Cooling capacity is created by the absorption chillers during each step-down phase for use elsewhere in the facility.

Abstract: A heat recovery system includes a source of waste heat, and a refrigeration system operatively connected to the source of waste heat. The refrigeration system is capable of extracting heat rejected from the source of waste heat to form a cooling medium.

Abstract: A liquid-based cooling system provides a method of supplying a heated coolant fluid at a relatively constant temperature and pressure to one or more heat driven engines, such as adsorption chillers or heat pumps, by utilizing a proportional flow control device in association with each of a plurality of heat-producing electronic components to optimize the output of a plurality of liquid-cooled cold plates operatively mounted on such plurality of heat-producing electronic components. The proportional flow control devices may be electro-mechanical or solid state proportional control valves for water flow control. The proportion flow control devices are operatively connected to be actuated based upon the electrical signals typically generated to control the variable cooling fans of the electronic components.

Abstract: An absorption cycle system utilizes an additional absorption circuit in conjunction with a traditional absorption circuit. The absorbent used in the additional absorption circuit could contain an ionic compound, or any absorbent with relatively low crystallization. Mixtures of such absorbent with water remain liquid at temperatures lower than the minimum feasible operating temperature of the traditional lithium bromide water absorbent solutions of the prior art.

Abstract: An absorption heat pump with a system for improving its efficiency under generator overfeed conditions. The absorber is bypassed to direct the rich solution directly into the generator, mixing this rich solution with liquid refrigerant.

Abstract: An absorption cycle system utilizes an additional absorption circuit in conjunction with a traditional absorption circuit. The absorbent used in the additional absorption circuit could contain an ionic compound, or any absorbent with relatively low crystallization. Mixtures of such absorbent with water remain liquid at temperatures lower than the minimum feasible operating temperature of the traditional lithium bromide water absorbent solutions of the prior art.

Abstract: Absorption refrigerator comprising; a cabinet having outer walls (1, 2, 4) and at least one door (3) which together encase at least one storage compartment (5) and which comprise a heat insulation material (2a, 3a, 11); and an absorption refrigerating system comprising a boiler (6), a water separator (7), a condenser (8), an evaporator (9) and an absorber (10), wherein said boiler, water separator, condenser and absorber are arranged outside said storage compartment. A channel (16) having an inlet (14) and an outlet (15) for conducting air through said channel is formed in an insulation (11) material comprised in one (4) of said outer walls. A ventilator (17) arranged to create a forced airflow in said channel. At least one of said absorber, condenser and water separator is arranged between said inlet and outlet in said channel.

Abstract: This invention relates to compositions comprising a refrigerant and at least one ionic compound and/or non-ionic absorbent, and also to devices capable of executing an absorption cycle using such compositions as a refrigerant pair. This invention also provides methods and apparatus for cooling using an absorption cycle comprising a refrigerant, and at least one ionic compound and/or non-ionic absorbent as the absorbent.

Abstract: In accordance with the present disclosure there is provided an efficient refrigeration system for cooling an environment using ammonia and sodium thiocyanate using a low grade heat source. The refrigeration system comprises a condenser for condensing vaporous ammonia to liquid ammonia coupled to an evaporator. The condenser condenses the ammonia vapour using a heat exchanger. The evaporator evaporates liquid ammonia to vaporous ammonia by absorbing heat from the cooling environment. An absorber absorbs the vaporous ammonia into an ammonia sodium thiocyanate solution and adsorbs vaporous ammonia on to sodium thiocyanate salts. The absorber is coupled to a regenerator through a solution pump for pumping ammonia sodium thiocyanate solution with dissolved ammonia from the absorber to the regenerator. The regenerator regenerates ammonia vapour from the pumped solution and supplies the regenerated ammonia vapour to the condenser and the concentrated solution back to the absorber.

Abstract: The hybrid solar air-conditioning system includes an air intake having an air drying system that uses a liquid desiccant to dry ambient air, a desiccant regeneration system that uses a heat exchanger having oil heated by solar energy to remove water from the desiccant, an indirect evaporative air conditioner that uses an air-air heat exchanger to cool the dried air indirectly with evaporatively cooled air, a distilled water recovery system to recover water from the desiccant and from the evaporatively cooled air in the form of distilled water, and a microprocessor-based controller to control room temperature and relative humidity, and to regulate air intake and the flow of desiccant and oil in the system. The hybrid system enables the use of evaporative cooling in regions having high humidity.

Abstract: An integrated energy production system and carbon dioxide reaction system for enhancing the energy efficiency and minimizing greenhouse gas emissions of thermally activated power production methods. The system utilizes heat of reaction from the carbon dioxide reaction system to directly reduce the fuel requirements of the thermally activated power production method. The system, when utilizing a reverse fuel cell, achieves concurrent carbon dioxide sequestration resulting from the fuel combustion.

Abstract: The present disclosure relates to improvements in refrigeration cycles. This disclosure relates to preferred processing of solution from absorber arrangements of absorption refrigeration cycles, to separate out refrigerant liquid. Examples are provided. A variety of equipment configurations, techniques, and processes are disclosed, as examples.

Abstract: A portable self-contained hair drying helmet is taught that has thermal storage, desiccants, a phase change material, and thin lithium ion polymer batteries to allow one to dry their hair while walking around and performing personal and household duties.

Abstract: A method and system of utilizing waste heat from a plurality of data center equipment comprising the steps of collecting waste heat from a plurality of data center equipment and utilizing said waste heat as the driving heat input for a heat driven engine. Heat recovery means collects waste heat from heat-producing equipment and transfers it in the form of hot water to drive a heat driven engine such as a chiller or heat pump. The output of the heat driven engine may be put to many productive uses, thereby reducing the over all energy load on the data center.

Abstract: Disclosed herein are compositions comprising at least one ionic liquid and at least one fluoroolefin. Such compositions may be useful as absorbent/working fluid pairs in absorption cycle systems for providing cooling or heat.

Abstract: Water evaporation with accompanying large amount of heat absorption is used in an apparatus and methods in cooling hot refrigerant in a condenser as result of work by an air conditioning compressor. A centrifugal water droplet generator and projector are designed with air flow modification of droplet travel paths for maximum even coating of condenser surfaces with thin water film for maximum evaporation efficiency. Vacuum is also used in the system for lowering of water evaporation temperature and carrying away moisture saturated air to further increase efficiency of condenser cooling.

Abstract: A heat exchanger is provided for use in heating and cooling applications. The heat exchanger includes a heat exchange fluid, at least one heating element for heating the heat exchange fluid, and a plurality of heat exchange pipes positioned in the heat exchanger. The heat exchange pipes are filled with an uncrosslinked high density polyethylene phase change material. The heat exchanger may be used in combination with separate shell and tube type heat exchangers to provide residential heating and hot water heating. The heat exchanger may also be used in combination with an absorption air conditioning unit to provide residential cooling.

Abstract: A chemical heat pump includes a reactor part (1) that contains an active substance and an evaporator/condenser part (3) that contains that portion of volatile liquid that exists in a condensed state and can be absorbed by the active substance. A channel (4) interconnects the reactor part and the evaporator/condenser part. To heat the reactor part, a portion of this wall is arranged as a solar energy collector, which can result in a very compact structure. In at least the reactor part a matrix (13) is provided for the active substance so that the active substance both in its solid state and its liquid state or its solution phase is held or carried by or bonded to the matrix. The matrix is advantageously an inert material such as aluminium oxide and has pores, which are permeable for the volatile liquid and in which the active substance is located. In particular, a material can be used that has a surface or surfaces, at which the active substance can be bonded in its liquid state thereof.

Abstract: A heat exchange and heat transfer device comprises an evaporating/absorbing arrangement connected to a binary mixture flow circuit containing a first refrigerant fluid and a second absorbing fluid. The refrigerant fluid is evaporated in the evaporator part of the arrangement and subsequently absorbed in the absorber part by an absorbing fluid-enriched mixture. The evaporating/absorbing arrangement comprises at least two oppositely disposed reference surfaces defining evaporation and absorption components, respectively, an evaporator mass for supplying the liquid refrigerant fluid to the reference surface of the evaporation component and an absorber mass for supplying the absorbing fluid-enriched mixture to the reference surface of the absorption component.

Abstract: An adsorption structure is described that includes at least one adsorbent member formed of an adsorbent material and at least one porous member provided in contact with a portion of the adsorbent member to allow gas to enter and exit the portion of the adsorbent member. Such adsorption structure is usefully employed in adsorbent-based refrigeration systems. A method also is described for producing an adsorbent material, in which a first polymeric material is provided having a first density and a second polymeric material is provided having a second density, in which the second polymeric material is in contact with the first polymeric material to form a structure. The structure is pyrolyzed to form a porous adsorbent material including a first region corresponding to the first polymeric material and a second region corresponding to the second polymeric material, in which at least one of the pore sizes and the pore distribution differs between the first region and the second region.

Abstract: Processes for the separation of a hydrocarbon-containing feed streams are described herein.

Abstract: An absorption system includes a generator, a condenser, an evaporator, and an absorber configured to circulate a solution of an absorber and a refrigerant. A purge system removes a non-condensable gas from the absorber. The purge system includes a first pump to remove the solution from the absorber, a connection to remove the refrigerant vapor and the non-condensable gas from a low pressure region of the absorption system, an eductor to receive and mix the solution, a separator to receive the solution and remove the non-condensable gas from it, a tank to receive the non-condensable gas from the separator, a controller to monitor a pressure level of the tank, and a second pump to remove the non-condensable gas from the tank in response to the monitored pressure level in the tank being greater than a predetermined pressure level.

Abstract: A humidity control system during humidification operation sequentially repeats a first mode in which a second adsorption heat exchanger (82) serves as an evaporator and the remaining adsorption heat exchangers serve as evaporators, a second mode in which a third adsorption heat exchanger (83) serves as an evaporator and the remaining adsorption heat exchangers serve as evaporators and a third mode in which a first adsorption heat exchanger (81) serves as an evaporator and the remaining adsorption heat exchangers serve as evaporators. For example, during the first mode, the first adsorption heat exchanger (81) serving as an evaporator adsorbs moisture in a first air. Furthermore, in the second adsorption heat exchanger (82) serving as a condenser, the adsorbent is regenerated to humidify a second air. Furthermore, in the third adsorption heat exchanger (83) serving as an evaporator, the second air given moisture and heat in the second adsorption heat exchanger (82) is cooled.

Abstract: An adsorber unit has an outer shell, a plurality of internal tubes extending through the shell for carrying heat transfer fluid, each tube having outwardly projecting fins along its entire length, and a solid adsorbent material in the shell surrounding the tubes such that the fins project into the adsorbent material, the fins being of a material (e.g., metal) of higher thermal conductivity than the adsorbent material. Metal wool loosely packed inside the tubes, or internal radial fins swaged into the tubes, increase internal surface area thereby enhancing convective heat transfer. Metal wool loosely packed between the external fins, or fine wire metal coils lightly squeezed between the external fins, further increase external surface area of the heat exchanger in contact with the adsorbent thereby enhancing contact heat transfer.

Abstract: The invention refers to a thermo dynamic system able to capture heat from the surrounding environment and transform it in mechanical energy which is to be used partially for self functioning while the rest is saved for a consumer. The system can work with any heat source, but is also designed for very small temperature differences between the warm and the cold source, which makes it fit for working with non-conventional energy, especially solar energy. The system can be used to provide heat, mechanical energy or electrical energy to both small and large consumers.

Abstract: A cooling, heating and power system (10) includes a prime mover (12) for producing electricity having a thermal output (18) and an electrical output (20) coupled to an absorption chiller (24). A part-load, active, redundant chiller (26) is thermally coupled to the absorption chiller (24) for receiving a cooling-heating fluid from the absorption chiller (24). The part-load chiller (26) operates at maximum efficiency at between about forty percent and about sixty percent of a maximum cooling load of the chiller (26) to thereby generate large volumes of cooling very efficiently. The system (10) may direct the cooling into a multi-zone cooling-heating circuit (40) including a critical zone (42) and a utility zone (44) thermally coupled to the chiller (26) for selectively delivering the cooling-heating fluid to at least one of the critical zone (42) and the utility zone (44) of the circuit (40).

Abstract: Method and apparatus for drying compressed air, comprising an adsorption dryer (300) situated downstream of a refrigeration-based dryer (100), wherein the refrigeration-based dryer (100) comprises a heat-recovery arrangement (10), an evaporator (40) and an arrangement (80, 90) to separate and drain condensate, and wherein the adsorption dryer (300) comprises a first column (160) and a second column (170), which contain adsorbing material and which are connected via a conduit (18) with two calibrated orifices (188, 189) and a heater (275) therebetween, and where the columns are included in a circuit for the compressed air so as to alternately work in the adsorption mode and the regeneration mode, and in which the compressed air entering the dryer (300) is taken in cold from the condensate separator (80), and the air exiting the dryer (300) flows back into the heat-recovery arrangement (10).

Abstract: A thermodynamic machine for the absorption and emission of heat at different temperatures has at least one thermodynamic device with at least one membrane separating a gas phase and a liquid phase provided for transport of heat, wherein the at least one membrane is permeable for at least one component contained in the gas and liquid phases. The at least one membrane is a porous membrane or a solution diffusion membrane or a modification of the porous membrane or a modification of the solution diffusion membrane.

Abstract: A system and method for reduction of diluent gaseous nitrogen (DGAN) compressor power in combined cycle power plant. A vapor absorption chiller (VAC) may be utilized to generate and transmit cooled fluid, such as water, to one or more heat exchangers located upstream and/or downstream of at least one compressor of the DGAN compressor system. Utilization of these heat exchangers may cool the temperature of the nitrogen, which may allow for less energy to be expended by the DGAN in compression of the nitrogen.

Abstract: Absorption heat pumps, absorption refrigeration machines and absorption heat transformers (referred to as apparatus for short) operated using A) methanol as refrigerant and B) a composition comprising the ionic liquid 1-ethyl-3-methylimidazolium acetate (EMIM acetate for short) as absorption medium.

Abstract: An apparatus for providing heating and/or refrigeration effect and a method thereof is disclosed which provides simultaneous heating and refrigeration, only heating or only refrigeration, using a double-effect vapor absorption cycle or a single-effect vapor absorption cycle. The present invention comprises providing a heat input to an absorbent in a generator to obtain a concentrated absorbent which is fed to a set of absorbers which are located in co-operation with a set of evaporators provided with a condensed refrigerant, to obtain heating and/or refrigeration effect. The heat/energy used during the process is recovered by a plurality of heat exchangers such that the wastage of energy and utilities is minimized. The present invention substantially reduces the CO2 emissions, thus is eco-friendly.

Abstract: Rotary absorption heat pump that comprises a rotary unit (1) that comprises a vapour generator (2), a condenser (3), an evaporator (4) and an absorber (5) interconnected to constitute fluid flow trajectories for a volatile fluid component and a liquid absorbing it. The heat pump also comprises heat transmission means for transmitting heat to the vapour generator (2), said heat transmission means comprising a heat exchanger (6) disposed in the rotary unit (1) through which a hot fluid flows, said heat transmission means also comprising adaptor means in order to transfer said hot fluid from a static environment to said heat exchanger (6).

Abstract: The present invention relates to an outdoor portable cooling system for patios, campsites, and other related areas. The invention is primarily to be used as a portable cooling system, but may be adapted as a permanently affixed cooling system. The invention includes a housing that contains an absorption system that would be powered by a propane burner. Heat generated by the burning propane gas can be used to operate the fan motor via a module that produces electricity from heat or whereby the motor is powered by a battery supply. The battery supply may be recharged by a solar panel or by a standard electrical line.

Abstract: A heat exchanger having an adsorbing core is advantageously applied to a refrigerating system mounted on an automotive vehicle. The adsorbing core absorbs heat from coolant and gives heat to the coolant thereby to perform heat-exchanging operation. The adsorbing core is composed of a heat exchanging member such as tubes or fins of the heat exchanger and a attracting layer connected to the surface of the heat exchanging member. A seed crystal retaining layer is firmly connected to the surface of the heat exchanging member, and the attractant crystals forming the attractant layer are grown on the seed crystals by a hydrothermal crystal growth method. Since the attracting layer is uniformly formed and firmly connected to the surface of the heat exchanging member, heat is quickly transferred between the attractant layer and the heat exchanging member.

Abstract: A humidity control apparatus has a refrigerant circuit 20 that has a compressor 21 and a first adsorption heat exchanger 23 and a second adsorption heat exchanger 25, each of which has an adsorbent for adsorbing the moisture of air supported thereon, and that reversibly circulates refrigerant to perform a vapor compression refrigeration cycle. The refrigerant circuit 20 is provided with a sensible heat exchanger 26 in which the refrigerant after having passed through the adsorption heat exchanger 23, 25 functioning as an evaporator exchanges heat with the air having passed through the adsorption heat exchanger 23, 25 functioning as a condenser, thereby cooling the air.

Abstract: The invention relates to a thermal energy management device for a vehicle, namely a vehicle equipped with an electric generator associating and fuel cell and hydrogen reformer, comprising at least one primary circuit circulating a first heat-conducting fluid, such circuit enabling calories to be collected from a thermal source and transported to at least one thermal exchanger wherein said device comprises at least one thermal exchanger constituted by a sorption exchanger, enabling the thermal energy management of vehicles, and namely, armored vehicles.

Abstract: Systems and methods are disclosed related to utilization of energy including utilization of latent energy from electricity generating processes. According to one exemplary implementation, steam is produced from thermal energy, such as fossil fuel energy, nuclear energy and solar thermal energy; generating electricity from the steam using a turbine; and directing steam exhausted from the turbine to an absorption chiller or desalination apparatus as a condenser to drive an industrial process therein. In one exemplary implementation the absorption chiller may be an atmospheric control system to produce a gas of a desired temperature such as in an air-conditioning system. In another exemplary implementation the heat exchange apparatus is a desalination system employed to produce water of a desired purity.

Abstract: Chilling is produced from heat that is normally wasted in the economizer section of a steam boiler. A thermally-activated ammonia-water absorption chiller is powered by a heat recovery unit. The heat recovery unit supplies boiler exhaust heat to desorb the working fluid of the chiller. That can be directly, such that the heat recovery unit is a heat recovery vapor generator that can be colocated with an economizer, in parallel or series. The exhaust heat can alternatively be supplied to the AARC indirectly, via a heat transfer loop and a separate generator. The desorbed ammonia vapor is rectified, condensed, and then used to produce the chilling. The heat released in the chiller when low pressure ammonia vapor is re-absorbed is used to preheat the boiler feedwater.

Abstract: A system for cooling components comprises a composite of a sponge or sponge-like material with liquid refrigerant absorbed thereon and encased in a containment material configured to rupture or otherwise release evaporating refrigerant when internal composite pressure reaches a threshold ?P from the outside pressure and/or at a pre-selected composite temperature, and thermal conduction means in thermal contact with the composite and one or more components for directing thermal energy to cool the components.

Abstract: The invention relates to refrigeration using a thermochemical system based on the coupling of two reversible physico-chemical phenomena between a gas and a solid or liquid sorbent, one at low temperature (the LT phenomenon) and the other at a higher temperature (the HT phenomenon). The LT phenomenon is a liquid/gas phase change of the fluid G or an absorption of the fluid G by a liquid sorbent. The HT phenomenon is a reversible sorption of the fluid G by a liquid or solid sorbent. The endothermic phase of the LT phenomenon takes place in a reactor thermally isolated from the ambient environment. The exothermic phase of the LT phenomenon takes place in a condenser in communication with the reactor in which the HT phenomenon takes place, the condensed fluid G then being transferred to the reactor in which the endothermic phase of the LT phenomenon takes place.

Abstract: The invention provides an absorption cooling system of the type including a liquid absorbent that remains in the liquid phase throughout the operation cycle, and a refrigerant having both a liquid phase and a vapor phase in the cycle, the basic system being powered by heat extracted from a hot fluid and powered auxiliary components, the system including the five basic components of a generator, an economizer, a condenser, an evaporator and an absorber, and further including a fluid circuit for the rich solution including a circulation pump, a fluid circuit for the lean solution, and for the refrigerant gas extracted from the liquid absorbent and replaced therein, partial circuits for hot fluid and for a cooling fluid, a jet mixer operating to mix saturated refrigerant gas with the lean solution to re-form the rich solution, the improvement comprising installing means for increasing the pressure of the saturated refrigerant gas flowing from the evaporator to the jet mixer.

Abstract: In the casing (11) of a humidity controller (10), a first bypass passage (81) is provided along one of side plates facing each other, and a second bypass passage (82) is provided along the other side plate. In the casing (11), a first heat exchanger chamber (37) and a second heat exchanger chamber (38) are arranged next to each other in the left-to-right direction in a space between the two bypass passages (81, 82). A first adsorption heat exchanger (51) is accommodated in the first heat exchanger chamber (37), and a second adsorption heat exchanger (52) is accommodated in the second heat exchanger chamber (38). Adsorbents are carried on the adsorption heat exchangers (51, 52). During the operation in which humidity of the air is not controlled, a first bypass damper (83) and a second bypass damper (84) are opened, and the air flows through the bypass passages (81, 82) to be drawn into a supply fan (26) or a exhaust fan (25).

Abstract: In a casing (11) of a humidity controller (10), a first heat exchanger chamber (37) which accommodates a first adsorption heat exchanger (51), and a second heat exchanger chamber (38) which accommodates a second adsorption heat exchanger (52) are arranged next to each other in the left-to-right direction. An indoor air side passage (32) and an outdoor air side passage (34) are provided on the rear panel portion (13) side of the heat exchanger chambers (37, 38), and a supply side passage (31) and exhaust side passage (33) are provided on the front panel portion (12) side of the heat exchanger chambers (37, 38). The rear panel portion (13) is provided with an outdoor air intake opening (24) and an indoor air intake opening (23) at locations close to a center of the rear panel portion (13) in the left-to-right direction.