Abstract: An air conditioner includes first and second air passages, first and desiccant devices, a system heat source, a heat supplier, a system heat source temperature sensor, an airflow controller and a controller. The first and second air passages are communicable with a space to be air conditioned. The first desiccant device disposing in the first air passage has a first desiccant material. The second desiccant device disposed in the second air passage has a second desiccant material whose temperature for regeneration is higher than the temperature for regeneration of the first desiccant material. The heat supplier supplies heat generated by the system heat source to the first desiccant device for regenerating the first desiccant material. The airflow controller regulates airflow in the first and second air passages. The controller controls the airflow controller based on the temperature of the system heat source detected by the system heat source temperature sensor.

Abstract: A humidity detecting apparatus includes a humidity sensor for detecting a relative humidity of air on an inner side of a window glass, an air temperature sensor for detecting a temperature of the air, a glass temperature sensor for detecting a temperature of the window glass, and a glass surface relative humidity calculation unit for calculating a glass surface relative humidity based on output values of the humidity sensor, the air temperature sensor and the glass temperature sensor. A heat conductive member is disposed between the glass temperature sensor and the window glass.

Abstract: A method for controlling the humidity inside a refrigerator, having at least a cavity and a refrigeration circuit including an evaporator and a compressor, comprising the step of measuring the relative humidity level inside the cavity, measuring the temperature of the evaporator and feeding the above measured values to a control algorithm capable of driving the refrigeration circuit in order to maintain substantially constant the average level of relative humidity and corresponding to a set value.

Abstract: A method of operating a reversible heat pump system includes steps of sensing an outdoor air temperature with a first sensor and sensing at least one condition of an outdoor heat exchanger coil with a second sensor. Input from the first and second sensors is then electronically analyzed to predict when frosting may occur on an outdoor heat exchanger coil. A proportioning reversing valve is modulated in response to this analysis in order to direct a controlled proportional backpressure flow of pressurized refrigerant from a pressure side of a compressor into the outdoor heat exchanger coil while pressurized refrigerant is continued to be supplied to an indoor heat exchanger coil. As a result, the pressure and temperature of refrigerant within the outdoor heat exchanger coil is raised to at least an extent necessary to prevent frosting on the outdoor heat exchanger coil. The steps are preferably performed continuously in a feedback control loop during operation of the reversible heat pump system as a heat pump.

Abstract: The present invention provides a method of utilizing an air conditioner to control a thermal comfort level of an environment, wherein the air conditioner includes a plurality of environment factor adjusting devices. The method of the present invention reduces energy consumption of the air conditioner when utilizing the air conditioner to improve the thermal comfort level of an environment.

Abstract: A method of preventing water carryover to an object cooled by an air flow from a cooling device includes receiving at least one representation of a relative humidity of the air flow, and preventing water carryover to the object by adjusting at least one cooling parameter of the cooling device based, at least in part, on the relative humidity. Further embodiments and cooling systems are also disclosed.

Abstract: The various embodiments herein provide an air conditioner system for providing cold and warm air in cars and buildings. The air conditioner system includes a chamber, a plurality of input air blades, a plurality of input air filters, an electrical ventilator, one or more wet heat exchangers, and one or more dry heat exchangers installed in the chamber, an outgoing air heat exchanger, an operation selection valve, an electrical circulating pump, one or more sets of water sprayers nozzles, one or more water sprayer pumps, one or more thermoelectric modules and a microcontroller unit. The passing of air through the chamber is automatically controlled by the microcontroller unit based on the operation of the system in the cooling or heating mode. The air is cooled in the cooling mode using the multistage water evaporation mechanism.

Abstract: A transportable dehumidifier system is provided that employs a thermal expansion valve to control the flow of refrigerant therethrough.

Abstract: An arrangement includes a plurality of wireless microsystems. Each microsystem is operable to measure at least relative humidity and temperature, and to communicate temperature and relative humidity information wirelessly to a network device. The network device is operable to communicate the temperature and relative humidity information to at least a first processor configured to cause a change in a building control condition based on the information.

Abstract: The described method and apparatus pertains namely to the HVAC (Heating, Ventilating, and Air Conditioning) industry, though its many functions extend into any and all forms of air-fluid movement, metering, distribution, and containment. Essentially, the scope of operation of the method and apparatus encompasses all forms of scientific and engineering measurement dealing with fluid dynamics, fluid statics, fluid mechanics, thermal dynamics, and mechanical engineering as they pertain to precise, articulated control of air-fluid distribution and delivery. The described method and apparatus offers complete, comprehensive, and correct utilization of air-fluid movers and terminal devices under unique sensor logic control, from initial lab testing stages through to equipment cataloguing, selection, design and construction of any and all air-fluid distribution systems in entirety, whereas previously there was no such cohesive, total and terminal method of control for these systems or their components.

Abstract: A method for controlling a vehicle HVAC system to automatically defog a window and to prevent fogging or condensation of the window. In-cabin air temperature and relative humidity are used to determine a dewpoint. Further, ambient or outside air temperature is measured. Window glass temperature is either estimated/calculated or can be measured. A fog margin, which is based upon the difference between the dewpoint and the window temperature, is calculated. When the ambient air temperature is below a predetermined temperature, a corrected fog margin is substituted for the calculated fog margin. When this occurs, the controller operates a fan at a reduced voltage, and hence at a reduced speed, as compared to if the controller used the calculated fog margin. Using the corrected fog margin prevents a vehicle user from being exposed to excessive fan noise or air currents during low or cold ambient air temperatures.

Abstract: An HVAC system including a compressor, a condenser and an evaporator arrangement connected in a closed refrigerant loop. The evaporator arrangement includes a plurality of refrigerant circuits. The evaporator arrangement also includes at least one distributor configured to distribute and deliver refrigerant to each circuit of the plurality of circuits. The plurality of circuits are arranged into a first and second set of circuits. The evaporator arrangement also includes a valve configured and disposed to isolate the first set of circuits from refrigerant flow from the condenser and provide flow of refrigerant from the compressor in a dehumidification operation of the HVAC system.

Abstract: A controlled access pharmaceutical storage case has storage spaces arranged vertically one above the other and a pharmaceutical refrigerator located at its base. A remotely actuable refrigerator door lock on the refrigerator door has a data port connecting with a programmed electronic control arrangement, e.g., a computer or network. The refrigerator has a compressor at the top of the case that operates on line AC or on battery DC backup power. A battery backup arrangement is located at the top of the case. When AC is detected to be absent or insufficient, i.e., during general or localized power failure, the refrigerator operates on battery, and the door lock is prevented from unlocking. Internal temperature and humidity levels are tracked and sent at intervals to a predetermined destination for action.

Abstract: The invention provides an air conditioner that is capable of performing optimal control in accordance with the environment of an indoor space at startup, and a method of controlling such. The air conditioner forms a refrigerant circuit having a first heat exchanger, a second heat exchanger, thermistors, humidity sensors, a temperature sensor, ventilation fans, a compressor, a casing, a control unit, and the like. The control unit is connected to the temperature sensor, the humidity sensors, a storage unit, a timer, a manual input unit, air passageway switching mechanisms, a four-way switching valve, and an expansion valve. In the stage before the air conditioner starts normal operation after startup, the control unit performs a priority control operation that prioritizes either the sensible heat process or the latent heat process.

Abstract: A fan has a sensor (86; 186) for sensing at least one value of the air that flows through the fan (20; 120). The fan has a fan housing (22, 24; 122, 124); an electronically commutated external-rotor motor, arranged in that housing, having an internal stator (30; 130) and an external rotor (46; 146); a fan wheel (56; 156) coupled to the external rotor (46; 146); an air inlet opening (58; 90; 158) for the inflow of air that is to be moved by the fan wheel (56; 156); a circuit board (68; 185) having a portion (66; 188) that extends adjacent the air passage opening (58; 158); and conductors (82, 84; 182?, 182?) arranged on that portion (66; 188), to which conductors the sensor (86; 186) is connected, preferably by a Surface Mounted Device (SMD) method. Premounting the sensor on the circuit board facilitates automated manufacture and reduces cost.

Abstract: To provide a low-cost and highly reliable indoor unit and an air-conditioning apparatus having the same by obtaining a dew point temperature at the outlet side without installing a humidity sensor and a dew point temperature detector at the outlet side.

Abstract: A control method and associated component configuration provide cooling for components within a wind turbine structure, such as a tower or nacelle. A recirculating airstream of internal air is established in the structure. For a defined set of operational conditions of the wind turbine that affect a required cooling capacity within the structure, the recirculating airstream is controllably augmented with external air to increase cooling capacity of the recirculating airstream. The amount of external air introduced into the structure is balanced with the amount of relatively hotter internal air within the structure so as to achieve a desired balance of temperature and relative humidity within the structure.

Abstract: An air conditioning apparatus comprises an air-conditioning unit including at least a cooling coil as a heat exchanger, a blower, a chiller, and a coolant pump for conducting air-conditioning, wherein the coolant pump pumps the coolant cooled by the chiller to the cooling coil, the cooling coil cools the air through heat exchange of the coolant and the air, the blower supplies the cooled air into a room. Coolant temperature of the chiller, the coolant flow rate of the coolant pump, and the air flow rate of the blower are calculated in accordance with the set points of the indoor temperature and the indoor humidity, and the chiller, coolant pump, and blower are controlled on the basis of the arithmetic calculation results. Thereby, the indoor temperature and indoor humidity are independently controlled in the central air-conditioning system.

Abstract: Systems and methods to regulate the amount of outdoor air that is introduced into a building. These systems and methods determine the mechanical load requirements based on adaptive control functionality. These systems and methods utilize extremum seeking control logic to vary the flow of outdoor air into the building in response to these load determinations.

Abstract: A control method for the air-conditioning treatment of products cyclically measures, at definable time intervals, the product temperature and, according thereto, automatically adjusts several environmental parameters inside the treatment chamber. In order to provide a process that is automatic and gentle and to save energy and time in comparison to conventional methods, actual values for a characteristic temperature of the product, the temperature of the air inside the treatment chamber and the temperature of the incoming air are measured in each cycle. At least at the beginning of the treatment process, the desired final state of the product is defined based on characteristic parameters, and set values for the measured parameters for the next cycle are automatically determined from the measured and defined parameters and, in the next measuring cycle, are compared with the respective actual values.

Abstract: An air cooling apparatus comprised of an injector cabinet fitted with a plurality electric solenoid operated injector valves which are controlled by an advanced computerized system which regulates the amount of moisture added to the air stream by activating the injectors based on direct measurement of indoor and outdoor dry bulb and wet bulb temperatures, mass flow through the apparatus and thermostat setting. This water injection module is location downstream of any air moving device.

Abstract: The present invention provides a process for controlling the cooling phase of a container to be cooled for a heat-regenerating adsorption system with the following process steps: definition of a cooling phase cut-off temperature as a function of at least one parameter which is characteristic of the cooling process, recording the outlet temperature of a cooling fluid emerging from the container to be cooled by means of an outlet temperature recording device, and termination of the cooling phase when the recorded outlet temperature of the emerging cooling fluid falls below the defined cooling phase cut-off temperature. The present invention also provides a device for a heat-regenerating adsorption system for controlling the cooling phase of a container to be cooled in accordance with this process.

Abstract: An outside air management system in which the air is cooled by a first refrigeration condenser to a temperature either above or somewhat below the dewpoint of the incoming air so as to remove either none of the moisture to be removed, or a significant portion of it. The air then is sent to a desiccant wheel which removes the remainder of the moisture to be extracted. The temperature of the air leaving the wheel is above the desired delivery temperature. Then a heat exchanger and a second condenser remove sensible heat from the heated air leaving the desiccant wheel to bring the air to the desired temperature. Thus, the temperature and humidity are controlled substantially independently of one another. A heat pump embodiment of the invention allows the reversal of the flow of refrigerant in the system, allowing it to be used to either heat or cool.

Abstract: Various thermostat embodiment are provided that includes at least a first sensor configured to communicate information indicative of the temperature within the space, and at least a second sensor configured to communicate information indicative of the humidity within the space. The thermostat further includes a controller in communication with the at least first and second sensors, for controlling the thermostat's operation. The controller is configured to operate in a first mode in which the controller operates the air conditioner when the sensed temperature of the space is above a temperature set-point or when the sensed humidity level is above the humidity set-point. The controller is further configured to operate in a second mode in which the controller operates the air conditioner when the sensed temperature is below a set-back temperature set-point, or when the sensed humidity is above a set-back humidity set-point.

Abstract: An automatic defogging system of a vehicle according to an exemplary embodiment of the present invention includes: an input unit used for receiving a directly sensed window relative humidity value from a defogging sensor so as to directly sense a humidity generation degree in a window; a controller which controls operations of an air conditioning system programmed as a type of a logic that is selectively and phasedly controllable depending on the sensed relative humidity and; an output unit that is a selection mode of the air conditioning system that can be controlled by the controller. Accordingly, an automatic defogging system of a vehicle and a control method thereof automatically removes fog or frost on an inner surface of a window while maintaining comfortable conditions inside a vehicle.

Abstract: An electronic device such as an HVAC controller that accounts for internal heating in determining an environmental condition such as temperature or humidity in the space surrounding the HVAC controller. The HVAC controller may calculate a transient heat rise value that is based upon a powered time period and a first order time lag, especially during a time period before which the HVAC controller reaches a steady state temperature condition.

Abstract: An air control apparatus having a refrigerant compressor, a condenser, an evaporator coil, and a reheat coil associated with a four way valve to selectively regulate flow of refrigerant to and from the condenser, evaporator coil and reheat coil to control the temperature and humidity of an enclosed environment.

Abstract: The present invention relates to a refrigerator unit and/or a freezer unit having an outer unit wall and/or having a door or flap closing the unit interior, wherein a heating device is provided at or in the region of the door or flap and/or at or in the region of the outer unit wall.

Abstract: An air conditioning controller is provided with a room temperature-humidity combination calculation unit, a temperature-humidity setting value determination unit and a temperature-humidity control unit. The room temperature-humidity combination calculation unit is configured to calculate combinations of room temperature and room humidity corresponding to a target value of a thermal comfort index PMV. The temperature-humidity setting value determination unit is configured to select and determine a combination of the room temperature and humidity that achieves energy saving among the calculated combinations of the room temperature and humidity. The temperature-humidity control unit is configured to separately control the room temperature and humidity so that the room temperature and humidity would measure up respectively to the determined temperature and humidity values.

Abstract: In a range of a wind velocity of 0.5 to 3.5 (m/s) in a refrigeration cycle, when combining absorbent having a small dependency on the wind velocity and the refrigeration cycle, it is not possible to vary dehumidification capability by changing the wind velocity and matching with an actual load is poor. In a refrigerating and air conditioning apparatus having a refrigerator 20 in which refrigerant is put, and having a compressor 20a for compressing the refrigerant, a condenser 20b, and a throttle device 20c, and an evaporator 20d, and a desiccant rotor 1, which is water adsorption means, an adsorbent is supported with the desiccant rotor 1, whose time constant at a water adsorption equilibrium becomes small as a wind velocity increases in the range of the wind velocity of 0.5 to 3.5 m/s, the condenser 20b is disposed upwind of the desiccant rotor 1, and the evaporator 20d is disposed downwind of the desiccant rotor 1.

Abstract: Methods of providing dehumidification control in unoccupied spaces are disclosed. An illustrative method can include the steps of providing a controller having an away mode of operation adapted to provide dehumidification within the interior space of a building or room, providing one or more system components adapted to control the humidity and/or temperature within the interior space, initiating the away mode of operation within the controller, and operating the one or more system components for at least one cycle to reduce the humidity within the interior space.

Abstract: A system for controlling temperature and humidity in an enclosure, that has a central air conditioning system; a dehumidifier attached to a return air duct of the central air conditioning system; and a system control unit that comprises a thermostat, dehumidstat and can control a cooling solenoid valve to provide temperature control, and control a dehumidifier solenoid valve to provide humidity control. The cooling solenoid valve and the dehumidifier solenoid valve can be independently activated based on the temperature and humidity of the enclosure. Embodiments of the present invention include systems that are easily modify existing air conditioning systems.

Abstract: A refrigerant system adjusts, in a coordinated prioritized manner, the variable capacities of a compressor, evaporator fan and a condenser fan to minimize the system's overall power consumption while maintaining a comfort zone within a target comfort range. The target comfort range is defined by desired temperature and humidity limits. When the comfort zone is within the target comfort range, the system periodically attempts to reduce the compressor capacity. If the attempt succeeds, the evaporator fan capacity is then minimized. The condenser fan capacity can also be minimized provided the refrigerant system can maintain at least a minimum saturated suction temperature of the refrigerant flowing from the condenser to the compressor.

Abstract: The energy efficient ventilation system provides tempered air to an air to air heat exchanger, such as a heat pump. The system includes independent air intake sources from a tunnel, a structure, and the exterior of the structure that direct air to a control module. Regulators control the amount of air that enters the control module from the air intake sources. The control module mixes the intake air and distributes the tempered air to the structure and to the air to air heat exchanger.

Abstract: A system and method for detecting low levels of humidity (i.e. less than 10%) inside an automotive vehicle is provided whereby the total absolute humidity inside the vehicle is determined by multiplying the number of occupants in the vehicle by an absolute humidity factor to obtain a total absolute humidity expelled by the vehicle occupants. The absolute humidity outside the vehicle is added to the total absolute humidity expelled by the vehicle occupants to arrive at a total vehicle cabin absolute humidity.

Abstract: A humidity controller apparatus (20) contains an adsorption rotor (24) and a heater (25). A first passage (21) along which a first air stream flows and a second passage (22) along which a second air stream flows are formed in the humidity controller apparatus (20). The amount of heat exchange between the first and second air streams and the amount of moisture exchange between the first and second air streams vary by adjustment to the rotating speed of the adsorption rotor (24), and the humidity controller apparatus (20) is switched between a dehumidification operation and a humidification/heating operation. During the dehumidification operation, the rotating speed of the adsorption rotor (24) is set low. The first air stream is dehumidified by the adsorption rotor (24) and then supplied to the inside of a room. The second air stream is used for regeneration of the adsorption rotor (24) and then discharged to the outside of the room.

Abstract: A control device for a fan motor (7) which cools a condenser (6) of a vehicle air conditioner includes a temperature sensor (12) which detects a temperature of an air that has passed through an evaporator (10) of the vehicle air conditioner; and a controller (2). The controller (2) functioning to calculate a reference value (Ds) of an airflow generated by a rotation of the fan motor (7); calculate a correction value (DUP, DUPT) of the airflow on the basis of the detected air temperature (Tair); set a target airflow (TDR) on the basis of the reference value (Ds) and correction value (DUP, DUPT) of the airflow; and control the rotation of the fan motor to effect the target airflow (TDR).

Abstract: A method of controlling a HVAC system for a hybrid vehicle having a refrigerant compressor driven by an engine is disclosed. The method may comprise: determining a requested air conditioning operating point for a passenger compartment; estimating a time to reach the requested operating point; based on the previous steps, estimating a maximum allowed compressor off time; determining if the allowed compressor off time is greater than a minimum engine off time; if the allowed compressor off time is greater than the engine off time, determining if the vehicle is entering an allowable engine off mode; if so, commencing engine shut-off mode; if engine shut-off is anticipated, prior to commencing the shut-off mode, adjusting the HVAC system to maximize cooling of the passenger compartment with minimum energy usage; and if the engine shut-off is commenced, monitoring the HVAC system to determine when engine restart is needed to maintain comfort.

Abstract: The present invention relates to a no-frost refrigerator unit and/or freezer unit comprising a fan for the generation of an airflow in a compartment of the unit to be cooled, wherein the unit comprises detection means for the detection of at least one parameter as well as a control or regulation unit which is made such that it varies the speed of the fan in dependence on the at least one measured parameter.

Abstract: The present invention provides an air conditioning system that can appropriately adjust humidity. The air conditioning system is an air conditioning system that comprises a plurality of indoor units that jointly air conditions a same space, comprising a first indoor unit and a second indoor unit. The first indoor unit comprises a first indoor heat exchanger that adjusts the temperature in the space. The second indoor unit comprises a second indoor heat exchanger and a humidifying element. The second indoor heat exchanger adjusts the temperature in the space. The humidifying element adjusts the humidity in the space. Further, the air conditioning system, during humidity adjustment, adjusts the humidity in the space by the humidifying element with greater priority than adjusting the temperature in the space by the second indoor heat exchanger.

Abstract: To obtain a refrigeration air conditioning system having a dehumidifying function by means of a moisture adsorption means, allowing the moisture adsorption means to be regenerated by use of discharged condensation heat or other discharged heat of a low temperature range in the refrigeration cycle, and exerting stable cooling performance even at a dry-bulb temperature of 0° C. or less. A desiccant rotor 1, being a moisture adsorption means, is made to hold an adsorbent having pore sizes of 5 ?m or less, more preferably 20 nm or less, and furthermore preferably 1-1.4 nm in a space at a predetermined temperature range of a dry-bulb temperature of 0° C. or less.

Abstract: A method and apparatus controls and/or regulates the evaporator temperature of an air conditioning system in a motor vehicle in cooling mode. When an outside air temperature exceeds a predetermined limit value, the evaporator temperature is controlled and/or regulated to a predetermined minimum evaporator temperature until a predetermined desired temperature in the interior of the vehicle is reached. After reaching the predetermined desired temperature in the interior of the vehicle, the evaporator temperature is increased until a predetermined interior humidity in the vehicle is reached, or the interior temperature is higher than the predetermined desired temperature for the interior of the vehicle.

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: A heat pump heat pump system, operating with an R-410A refrigerant, comprised of at least one of an air source heat pump system, a water source heat pump system, and a direct expansion heat pump system, preferably for use in a Deep Well Direct Expansion heat pump system, which incorporates a three-mode receiver and an interior air handler, with at least one fan, with such air handler comprised of a combination of two sets of refrigerant to air heat exchange tubing/interior air heat exchange means, with by-pass lines and solenoid valves to facilitate system operation in the desired operational mode, all enabling optimum system performance in one of the desired heating mode, cooling mode, and dehumidification mode of system operation, as controlled by at least one of a thermostat/humidistat.

Abstract: A dehumidifier system is connected to an interior space of a building through supply and return ducts, either directly and/or through an HVAC system. Controllable dampers can be used to select how the dehumidifier system is connected to the interior space and the HVAC system. The dehumidifier determines the dew point of the ambient air from temperature and relative humidity measurements taken at location(s) of relative humidity and temperature sensors. Based on the determined dew point, the dehumidifier system determines whether to operate. The temperature and relative humidity sensors can be located in the interior space or within the dehumidifier, where they project into the air stream flowing through the dehumidifier. The dehumidifier system operates in response in part to blower calls to the HVAC system and controls the HVAC system and a ventilation system to distribute the dehumidified air and outside air throughout the building.

Abstract: Control apparatus for an environmental control system comprises input circuitry receiving environmental information and output circuitry for controlling an HVAC system. Processing circuitry in the controller configures the output circuitry based at least in part on the signals received on the input circuitry. Information about the status of the HVAC system may be transferred to system administrators using a wireless link.

Abstract: A refrigeration control device to reduce power consumption of a refrigeration appliance has an ambient temperature/humidity sensor and a main controller. The ambient temperature/humidity sensor is mounted outside the refrigeration appliance. The main controller is mounted in the refrigeration appliance, is electronically connected to the ambient temperature/humidity sensor and at least one defogging heater in the refrigeration appliance and stores a dew point formula, a defogging database and a defogging control process. The defogging database is a table of multiple standard dew point values and multiple defogging duration values. The defogging control process calculates a dew point from the dew point formula, enters the table with the closest standard dew point value and extracts the corresponding defogging duration value from the table in the defogging database and activates the defogging heater for a number of times equal to the extracted defogging duration value.

Abstract: A system (20) for conditioning air (30) includes conditioning circuits (26, 28). Each of the circuits (26, 28) includes a heat transfer coil (54, 60) residing in a supply section (22) of the system (20), and a heat transfer coil (56, 62) residing in a return section (24) of the system (20). A controller (50) in communication with the circuits (26, 28) determines one of a heating mode (78, 110) and a cooling mode (148, 150) for an interior space (34). The controller (50) selectively actuates the conditioning circuits (26, 28) to condition outside air (30) entering the supply section (22) to produce conditioned supply air (36) for provision into space (34) and to recover heating and cooling energy from return air (38) entering the return section (24) from the space (34) prior to its discharge from the system (20) as exhaust air (44).

Abstract: An energy recovery unit has an energy recovery wheel located in a plenum. Expelled air from the return duct is delivered to the plenum and after passing through the wheel is expelled by an exhaust fan through a side wall. Makeup air is delivered to the plenum and after passing through the wheel is supplied to the return duct by a fan. The makeup air follows a serpentine path from an intake in a side wall to the return duct.

Abstract: In an input section (30), a set temperature Ts which becomes a control target temperature of a humidity controller (10), and a set relative humidity Rs which becomes a control target humidity of the humidity controller (10) are set. An air conditioning control section (42) adjusts the temperature adjusting capacity of the humidity controller (10) such that the room temperature may come very close to the set temperature Ts. Further, an arithmetic section (33) calculates, as the target absolute humidity As, the absolute humidity which becomes the relative humidity set value Rs at the set temperature Ts. A humidity adjustment section (41) adjusts the humidity adjusting capacity of the humidity controller (10) such that the absolute humidity of the room may come very close to the target absolute humidity As.