Abstract: There is disclosed a module control system and wet (i.e., flooded) building drying process that controls drying air circulation between inside and outside the building based upon absolute humidity and temperature sensor measurements.

Abstract: A method is provided of determining windshield fog secondary for automatically controlling a heating, ventilation and air conditioning (HVAC) system of a vehicle. The method includes the steps of determining whether rain is occurring on a windshield of a vehicle, determining a windshield parameter as a function of the rain occurring and determining a temperature difference based on temperature within a cabin of the vehicle and ambient temperature. The method also includes the steps of determining a fog boundary based on the windshield parameter and temperature difference, determining a relative humidity based on the windshield parameter and the temperature difference and fog boundary and determining a fog probability based on the fog boundary relative humidity and a nominal base relative humidity for rain conditions. The method further includes the steps of determining anti-fog actions to be taken based on the fog probability and taking the anti-fog actions determined to control the HVAC system.

Abstract: Unless constantly protected by overhead garages, an automotive vehicle, when parked and with its windows and sunroof opened or closed, is often subjected, respectively, to the risk of freezing or overheating its interior. Such extreme temperatures will reduce the life span of the electronic and mechanical components in or near the vehicle interior. Also, excessively high and low temperatures in the interior of the car would clearly cause a rather discomforting experience for the driver and passengers who subsequently seat themselves in it. This experience is keenly amplified for young children, elderly and those who are physically weak because of their reduced tolerance to discomfort.Briefly, a method and apparatus is provided for automatically adjusting a vehicle's window and sunroof positions after a vehicle operator has left a car unattended. The present invention includes a power window and sunroof system for an automotive vehicle.

Abstract: An air conditioning system and method for conditioning air utilizes a main air conditioning body fitted minimally with an ambient air temperature and humidity sensor, a humidifier, a conditioned air fan, a downstream air temperature and humidity sensor, and a central controller for sensing and controlling each of the operative elements of the system. The humidifier includes a plurality of nozzles which spray conditioning water into the incoming airstream. Optional components include an air pre-heater, a pre-filter, a heat exchanger, and a final filter.

Abstract: There is disclosed a system and method for preventing fogging of the windows of an automotive vehicle. The system and method operate the air conditioning system of the vehicle at temperatures where a high degree of probability of fogging exists. The method includes the steps of measuring the ambient temperature, the evaporator core temperature and operating the air conditioning compressor at specific duty cycles depending upon these temperatures. The duty cycle will be determined based upon these temperature variables as well as the relative humidity within the passenger cabin of the vehicle.

Abstract: In a main controller for use in an air conditioner for controlling temperature/humidity of an intaken outside air, a controlling line setter (18) sets each of control lines (J.sub.1 -J.sub.5) on a psychrometric chart table (13), in which an aimed temperature/humidity line (Lo) is formed by connecting an upper limit state point (Ps) and a lower limit state point (Pw) of condition air from each of the outside air state points (G.sub.1 -G.sub.5) to the aimed temperature/humidity line (Lo). The controlling line (J.sub.1 -J.sub.5) is formed by connecting necessary lines selected from a main heating line (H.sub.L) showing the heating operation of a main heater (H), an adiabatic humidifying line (W.sub.L) showing the humidifying operation of an adiabatic humidifying device (W), a cooling line (C.sub.L) showing the cooling operation of a cooler (C) and an auxiliary heating line (RH.sub.

Abstract: An environmental control apparatus controls humidity and temperature in a closed environment such as may exist in outdoor electrical switchgear boxes and the like. Temperature and humidity sensors are coupled to a controller which compares the sensed conditions to low temperatures and a high humidity setpoint. If either the temperature is below the temperature setpoint or the humidity is above the humidity setpoint a heater is energized until the respective condition is corrected. A high temperature cutout is provided to prevent high humidity conditions from causing the heater to raise the temperature to excessive levels. Typically, the controller engages the heater at temperatures of below 40.degree. F., humidity levels of above 65.degree. b, with a high temperature cutout at 140.degree. F.

Abstract: A humidifying system containing at least one compressed-air sprayer with a compressed-air input, a water input and an outlet valve for compressed air and water, compressed-air pressure regulators for regulating the pressure of the compressed air that is to be inputted, water pressure regulators for regulating the pressure of the water that is to be inputted, and at least one humidity sensor for measuring the humidity of the air that is humidified or that is to be humidified. The humidifying system also has controls which are actively connected to compressed air pressure regulators and/or water pressure regulators and to the humidity sensor (of which there is at least one).

Abstract: A temperature and humidity control apparatus includes a humidity control section for controlling humidity when a flow rate of a low temperature fluid in a cooling dehumidifier composed of a heat exchanger is determined; a heater control section for controlling temperature when a flow rate of a high temperature fluid in a heater; and a predicting device for predicting an amount of temperature change caused by an operation of the cooling dehumidifier. The amount of predicted temperature change is canceled when the flow rate of the high temperature fluid in the heater is determined in the heater control section, and the flow rate of the high temperature fluid in the heater is determined so that the setting temperature can be realized.

Abstract: A humidity control system employed on a container refrigeration unit, and method of controlling the container humidity, that includes a computer controller and utilizes a humidity sensor, a moisture supply system in combination with output drivers to control and limit the level of relative humidity level within a cargo container to a predetermined range when normal refrigeration system controls are active. The humidity control system operates the moisture supply system in a manner that significantly maintains a high, but not excessive, level of moisture in the circulating air and in the stored cargo. The humidity control system can also be configured to operate as a stand-alone system thereby eliminating the need to provide additional evaporator fan controls for the refrigeration unit.

Abstract: An improved heating and cooling system is provided which also includes dehumidification and energy recovery capability. The system includes two or more heat pump circuits operating singly or in concert to provide heating, singly or in concert in reverse to provide cooling, or concurrently but oppositely to provide dehumidification only, dehumidification concurrently with heating, or dehumidification concurrently with cooling. The system is adapted to include desuperheaters while being simultaneously providing heating, cooling, or dehumidification.

Abstract: The description relates to a device for air conditioning control in an air-conditioned room containing textile machines, especially circular spinning and spooling machines, with an air feed and an air discharge duct connecting the air-conditioned room to the air conditioning unit. A first set of sensors for measuring the temperature and relative humidity of the air in the room is connected for the control purposes to a first regulating circuit, and a second set of sensors for measuring the temperature and relative humidity of the feed air is connected for control purposes to a second regulating circuit. The first and second regulating circuits are connected in cascade, the first regulating circuit supplying a reference value to the second regulating circuit which controls the adjusting components of the air conditioning unit.

Abstract: The electric lock system combines an electric lock with an energy control unit such that when a guest key is used in the lock, the lock communicates with the energy control unit to move from an unsold state to a sold state. Optionally, the guest key has information which tells the lock when the guest will leave and the lock communicates to the energy control unit to move from the sold state to an unsold state. Another option, includes a motion detector and door switch which allows the lock to detect the presence of the guest in the room and allows the lock to further employ an occupied and unoccupied state. The combination of the electric lock system and the energy control unit provides energy savings in the heating and cooling of the room.

Abstract: A method of operating an HVAC system having an HVAC control and a humidity limiting control. The method comprises the steps of: determining a relative humidity limit for a space; monitoring relative humidity in the space; comparing the relative humidity to the relative humidity limit; operating the conventional HVAC control if the space humidity does not exceed the humidity limit; and integrating the HVAC control and dehumidification controls if the space conditions require humidity limiting action.

Abstract: A method and an apparatus for sensing an illuminance and a temperature around a humidifier and controlling a humidifying operation is disclosed. An illuminance inside a room in which a humidifying operation is applied by the humidifier is sensed by an illuminance sensor. The humidifying operation of the humidifier is operated in a sleeping humidification mode when the sensed illuminance is lower than a reference illuminance. The humidifying operation of the humidifier is operated in a normal humidification mode when the sensed illuminance is higher than the reference illuminance. A temperature inside the room in which the humidifying operation is applied by the humidifier is sensed by a temperature sensor. The humidifier executes a heater humidification and an ultrasonic humidification when the sensed temperature is lower than a reference temperature. The humidifier stops the heater humidification and executes the ultrasonic humidification when the sensed temperature is higher than the reference temperature.

Abstract: A space comfort system controls humidity in a space by applying heat to air recirculated to the space when the humidity is excessive and cooling of the air is not required. In a preferred embodiment, the call for heat occurs from the time the humidity increases to a level above a differential band within which is the humidity set point until humidity falls to below the differential band. Heat is applied to the air only when there is no demand for cooling of the air.

Abstract: An electrically operated valve controls the flow of irrigation water. A clock or computer controls the time of day and a programmed watering schedule. The clock signal is serially connected through differential relative humidity (RH) and temperature sensitive circuits. These circuits sense the difference between the surrounding RH and above ground temperature and set points derived from meterological "Normals, Means, and Extremes" weather data. When the difference between the set point readings and the surrounding RH or temperature becomes zero and beyond, solenoid activation is prevented during and sometimes before inappropriate weather and evapotranspiration conditions, such as rain, snow, or freeze.

Abstract: An air conditioning system with temperature and relative humidity sensors connected to a computerized control system. The control system acts on preselected stored data to turn on the air conditioning system to maintain the environment within a selected comfort zone. Air flow through finless coils and a preset damper enter a constant speed blower to an air duct. The air in the ducts remains over the dew point. In an alternative arrangement a coil with fins as well as a coil without fins is used.

Abstract: A control for a fan has a temperature sensor and a humidity sensor the outputs of which are supplied to a processor. The processor switches on the fan when certain temperature and humidity conditions are met. The processor turns on the fan in response to an increase in temperature and humidity, a larger increase in humidity being required for a smaller increase in temperature. The fan is also turned on when humidity rises above a certain threshold value, which is lower for higher temperatures.

Abstract: A thermostat and method for controlling relative humidity is disclosed. The thermostat and method embodied therein controls a heater to maintain the ambient temperature a few degrees above a minimum temperature that is required to prevent condensation, frost and/or freezing. The thermostat controls heater operation from calculated saturation (dew point) temperature values derived from sensed relative humidity and ambient temperature values. The thermostat compensates for sensor non-linearity without the use of additional hardware circuitry or the use of memory intensive lookup tables. In addition, the thermostat of this invention adjusts for the inherent variances in electrical characteristics of the particular sensors used in thermostat circuitry. In one embodiment, the thermostat controls the operation of the heater to maintain the ambient temperature a few degrees above the calculated dew point.

Abstract: An automatic control system for regulating the cooking process of a food product where it reaches the desired result respective of the initial temperature of the food product, its moisture content or quality. The invention solves the problem by using the characteristic breakpoints (2,3,4,5) that, whereby the adding of heat, occurs on one or two temperature curves (12,13) obtained at different measuring points, when the temperature again rises after the temperature drop of the heat transportation of medium after the insertion of the food product with a lower temperature than the heat transportation medium or when water transites from solid to liquid form (2,3) and from liquid form to steam (4,5).

Abstract: A method for controlling a heating of a heater in a heating-type humidifier in which both a heating amount and a heating ON/OFF period is controlled on the basis of a present room temperature, is disclosed. A sensed present humidity is compared with an objective humidity which is set by a user. When the present humidity is greater than or equal to the objective humidity, whether or not water exists in a water tank of the humidifier is determined. When the water does not exist in the water tank, an alarm is generated. When the water exists, a humidifying operation stops. When the present humidity is less than the objective humidity, the humidifying operation is executed while increasing both a heating amount and a heating ON period of the heater in proportion to the present room temperature. As a result, the arrival times at the states of objective humidity are shortened.

Abstract: A low-cost, accurate enthalpy sensor is described. The invention provides an on/off output which reflects the result of a comparison between the enthalpy level of a space and a predetermined setpoint. The sensor combines a signal representative of humidity with a signal representative of temperature to create a signal representative of enthalpy. The signal representative of enthalpy is compared with a predetermined setpoint to determine if the enthalpy level is above or below the setpoint. An output is then produced which indicates whether the output representative of enthalpy is above or below the predetermined setpoint.

Abstract: A transaction terminal (2) which incorporates a control unit (4) for controlling the operation of the terminal. Terminal operation is monitored by a plurality of sensors (110-116) in communication with the control unit (4). The control unit (4) can access data characteristic of predetermined acceptable terminal operation and the outputs of the sensors (110-116) are compared with said data. The control means (4) is adapted to alter terminal operation in dependence on the output of the sensors (110-116) so as to compensate for any variation from the acceptable terminal operation. The sensors (110-116) also include additional sensors (118,120) arranged to monitor ambient environmental conditions, and the control unit (4) is arranged to alter terminal operation dependent on changes in the ambient environmental conditions as detected by the additional sensors (118,120).

Abstract: There is provided a water feed device for humidification, comprising: an outflow reservoir that is disposed above a humidifier for feeding water into the humidifier by way of a permeation and that is provided with an overflow dam for maintaining a level of the water in the outflow reservoir substantially constant; an inflow reservoir that is disposed upwards of the outflow reservoir and that is provided with a flow inlet; a partition plate that is disposed between the inflow reservoir and the outflow reservoir; and a plurality of drip feed members which are provided in the partition plate for allowing the water in the inflow reservoir to drop by gravity in a form of droplets into the outflow reservoir.

Abstract: A controller for a climate control system has a relative humidity sensor as well as a dry-bulb temperature sensor within the enclosure. The humidity value is used in conjunction with the dry-bulb temperature to generate an enthalpy error signal which is a function of both the dry-bulb temperature and the relative humidity values. This permits robust control of both enclosure temperature and enclosure humidity without abnormal cycling of the climate control system. Instead of using a sensor which directly measures the enthalpy, the enthalpy can be synthesized from the relative humidity and dry-bulb temperature within the enclosure. Alternately, the sensed and set point enthalpy values can be synthesized from any two thermodynamic properties of the moist air within the enclosure.

Abstract: The humidity of the atmosphere contacting a sample and the water vapor partial pressure are program controlled and measured in a device having: a sample chamber which is provided with an inlet and an outlet for water vapor and which is capable of controlling a feedback temperature along with the sample stored therein; a warm water chamber for generating saturated water vapor pressure which has a gas inlet and an outlet connected to a pipe and which is capable of controlling the feedback temperature; a humidity program function generator for outputting a target humidity value for the sample chamber for each input time interval; a memory for storing a temperature-saturated water vapor pressure curve; and a calculator for calculating a control target temperature for the warm water chamber for generating the saturated water vapor pressure on the basis of the sample chamber target temperature output from a temperature program function generator, sample chamber target humidity of the sample chamber output from the

Abstract: A space heating system with a controllable air humidification capability calculates a theoretical value for the temperature of the interior surface of the space's windows. The system controls humidity in the space to a level just below that at which water will condense on the window surfaces.

Abstract: A method and apparatus for ventilating a building comprises an air duct extending between an attic and a basement or crawl space through an occupiable portion of the building. The duct has no openings within the occupied portion of the building, the occupied portion being substantially isolated from the transfer of air to and from either the attic or the basement or crawl space. An exhaust fan extracts hot air from the attic to the atmosphere, while a duct fan replaces the air in the attic with cool, humid air from the basement or crawl space. The crawl space or basement is replenished through exterior openings in the building to the atmosphere. A thermostat and humidistat control the operation of the fans in response to environmental conditions within the attic. A detector can shut down the fans if radon is detected in the duct.

Abstract: A central air handling and conditioning apparatus is provided with a by-pass dehumidifier for maintaining the temperature of the air in a plurality of enclosed spaces within a predetermined range and the relative humidity of the air below a predetermined value. The apparatus includes an air conditioner for regulating the temperature of the air, a dehumidification means for regulating the relative humidity of the air and an air handler for circulating the conditioned and dehumidified air through the enclosed spaces. The air conditioner is a conventional forced-air furnace or heater, an air-conditioner, an evaporative cooler, or a fan or blower for heating or cooling the air and returning the air to the enclosed spaces. The dehumidification means is a modified dehumidifier for removing water vapor from the air. The air handler includes a conventional air circulation means which may be, for example, the blower of the air conditioner.

Abstract: Method and control system for controlling an automotive HVAC (heating, ventilation and air conditioning) system using fuzzy logic to increase steady state comfort of an occupant in a vehicle and to decrease the time needed to reach steady state comfort. The control system responds to signals generated by various climate control sensors, including a humidity sensor, to produce a desired humidity, temperature and flow. Fuzzy logic calculations are performed based on fuzzy rules and membership functions to provide nonlinear compensation and to allow the control to be expressed in the same heuristic terms that an occupant could use in describing the level of comfort.

Abstract: Method and control system for economically controlling an automotive HVAC (heating, ventilation and air conditioning) system using fuzzy logic. The control system responds to signals generated by various climate control sensors including a humidity sensor to produce a desired vehicle air temperature and air flow. Fuzzy logic calculations are performed based on fuzzy rules and membership functions to provide nonlinear compensation for setting the rate of clutch cycling in a CCOT system or refrigerant metering in a TXV system.

Abstract: A system provides a flexible control of heating, ventilation and air conditioning (HVAC) for enclosed areas. The apparatus and method of the present invention measures selected internal environmental variables in the enclosed area including data from a motion sensor indicating the occupancy status of the area for automatically controlling the operation of the HVAC system. Control settings are made to meet desired temperature and energy consumption levels. A logic algorithm and microcomputer determine humidity levels. The humidity levels are controlled to minimize the occurrence of mold and mildew. Algorithm timing strategies optimize air drying initiated by an occupancy sensor.

Abstract: A device for evaporatively cooling the passenger interior of a motor vehicle, utilizing the vehicle ventiliation ducting and blower. An electrical pump provides water from a vehicle-mounted reservoir to a spray nozzle mounted to discharge into ventilating air entering the outside air inlet of the ventilation ducting.

Abstract: Novel prosthetic nuclear implants for insertion into vertebral discs are prepared by dehydrating hydrated bulky hydrogel discs under specific conditions so as to reduce the water content as low as possible (down to about 10% by weight) but without distortion of the implants, without the formation of concavities and sharp edges, and without changing the shape of the hydrated implant.

Abstract: Method and control system for controlling an automotive HVAC (heating, ventilation and air conditioning) system using fuzzy logic to prevent fogging. The control system responds to signals generated by various climate control sensors including a humidity sensor to produce a desired vehicle air temperature and air flow to detect and avoid incipient windshield/window fog conditions. Fuzzy logic calculations are performed based on fuzzy rules and membership functions to provide nonlinear compensation.

Abstract: A poultry house controller (14) situated within a poultry house (12) regulates the relative humidity and temperature within the poultry house (12) via actuation of fans (22) and heaters (24) in response to temperature and humidity feedback signals from temperature sensors (16) and humidity sensors (18), respectively. The controller (14) can communicate with a host computer (16) and other controllers (14) situated at other houses (12). The controller (14) comprises an integrity check means (234) for checking temperature and humidity values detected by these sensors (16, 18). The integrity check means (234) ensures the accuracy of values by eliminating a value from consideration if it falls outside predefined range of the average of the other values received from other sensors. Additionally, the controller (14) utilizes watchdog timing signals (100) for ensuring continuous operation. The watchdog timing signals (100) are generated by a control program (108) and are sent to an alarm system (92).

Abstract: A method and apparatus for controlling an environmental parameter is disclosed. The apparatus includes a source of energy controlled air and a source of external air. A damper determines the amount of external air and energy controlled air provided to the room. A control circuit controls the position of the damper in response to an enthalpy calculator. The enthalpy calculator includes a temperature sensitive resistor having a resistance RT and a relative humidity sensitive capacitor wherein the capacitance of the relative humidity sensitive capacitor is CS. An electronic circuit includes RT and CS and provides an output h: ##EQU1## The method includes the steps of providing energy controlled air and external air. The temperature and humidity of the external air are sensed, and the enthalpy is calculated using the equation ##EQU2## where t is the temperature and RH is the relative humidity. The amount of external air provided is adjusted using the calculated enthalpy as a parameter.

Abstract: An environmental control system for controlling heating, ventilation, humidification and air conditioning equipment located in plant area of a house includes a kit consisting of a remote control unit located in a living space of a house that is linked by a four wire link to a main control unit located in or adjacent the plant area. The remote control unit has a temperature control device, a humidity control device, and a fan control device. Additionally, the remote control unit may include indicating devices and/or an internal battery charger for a rechargeable battery that may be used to operate electronic circuits and controls in the remote unit. AC power from an AC transformer in the plant area is supplied to each of the control devices via the four wire link. The main control unit has relay coils coupled to the four wires in the wire link via selectively poled diodes.

Abstract: The present invention provides for a humidistat which can be connected to a humidifier through a thermostat and its existing wiring. The thermostat has a plurality of output leads for a heating signal, a fan signal and/or a cooling signal. The humidistat includes a first input for receiving the heating signal from the thermostat, a sensor associated with the first input for sensing the relative humidity of the air in the enclosed volume, a second input for receiving the cooling signal from the thermostat, and a first switch with a heating position and a cooling position for switching between the first and second inputs, respectively, and an interface module for selectively energizing either a humidifier when the first switch is in the heating position or a cooling system when the first switch is in the cooling position.

Abstract: A multi-functional room air conditioning unit that controls both heat and humidity as well as the concentration of airborne particulates. A control unit monitors temperature, humidity and air quality parameters and automatically programs the apparatus to take corrective action when one or more of the parameters is outside of the desired range.

Abstract: An air conditioning apparatus by which the air conditioning apparatus is controlled with optimal respondency and stability so as to enjoy indoor-space comfortability. The air conditioning apparatus for use with cycle dry, includes: an outdoor heat exchanger; a fan unit for blowing air to the outdoor heat exchanger; an adjusting portion, connected to the outdoor heat exchanger, for adjusting flow rate of refrigerant; a first indoor heat exchanger and a second heat exchanger connected to the adjusting means; a compressor which is connected both to the indoor heat exchanger and the outdoor heat exchanger, and which is controllable by an inverter unit; a detecting portion for detecting temperature and humidity indoors; and a cross control system for determining rotation frequencies of the fan unit and the inverter unit by comparing data obtained from the detecting portion with predetermined values of temperature and humidity indoors.

Abstract: An air conditioner apparatus wherein the range of fluctuation of the difference between the room temperature and the desired preset temperature is divided into a plurality of zones, a variable capacity compressor being driven at frequencies respectively corresponding to these zones, and a heater is provided in an internal unit when a drying operation mode is selected and the room temperature is in a zone lower than the desired preset temperatures. The apparatus is further equipped with a switch that shifts the frequencies corresponding to the zones in the drying operation mode in the direction of an increasing dehumidification capacity.

Abstract: A poultry house controller (14) situated within a poultry house (12) regulates the relative humidity and temperature within the poultry house (12) via actuation of fans (22) and heaters (24) in response to temperature and humidity feedback signals from temperature sensors (16) and humidity sensors (18), respectively. The controller (14) can communicate with a host computer (16) and other controllers (14) situated at other houses (12). The controller (14) comprises an integrity check means (234) for checking temperature and humidity values detected by these sensors (16, 18). The integrity check means (234) ensures the accuracy of values by eliminating a value from consideration if it falls outside predefined range of the average of the other values received from other sensors. Additionally, the controller (14) utilizes watchdog timing signals (100) for ensuring continuous operation. The watchdog timing signals (100) are generated by a control program (108) and are sent to an alarm system (92).

Abstract: A humidity control system is provided for controlling the humidity of the air confined within a container. The humidity control system includes sensors for determining the temperature of the air both within and outside the container. The sensors are also constructed to determine the humidity of the air inside the container. A controlled droplet applicator that is responsive to a humidity control signal is provided for increasing the humidity of the air within the container. A data processor is responsive to the sensors for providing the humidity control signal to increase and decrease the humidity of the air within the container. The humidity control system also includes a water flow control system for controlling the flow of water within the container. The water flow control system is responsive to the data processor for substantially preventing water from freezing in the controlled droplet applicator.

Abstract: A portable temperature and humidity controller which has a temperature sensor, a humidity sensor, temperature and humidity setpoint device, a transformer, a male plug for insertion into a wall outlet and a female outlet into which the controlled air conditioner plugs in with a manual switch to control the air conditioner using one of the humidity or temperature sensor.

Abstract: An automatic control method for an air conditioner which can optimize the indoor temperature and humidity, wherein an adequate dehumidifying operation is performed by recognizing the humidity according to the weather based on the outdoor temperature changes preceived by the outdoor temperature sensor for a certain time period, which provides comfortable surroundings and increases the efficiency of the air conditioner as well by preventing apparatus freeze resulting from a prolonged dehumidifying operation under low temperatures.

Abstract: An environmental control system that utilizes the output of a thermostat to estimate the outdoor temperature can be used to eliminate the possibility of condensation on the inside of windows and on the inside of the walls. This is important in homes and buildings that are located in areas where the outdoor temperature gets very low. An acceptable humidity level can be calculated when the outdoor temperature has been determined. Once the acceptable humidity level is calculated, this value can be communicated to the humidistat so the humidity level within the house can then be adjusted accordingly. The humidistat can have the capability to manually override the automatic adjustments, thus giving the operator the flexibility of maintaining the humidity level within the building at a desired level.

Abstract: A controller for a climate control system has a humidity (wet-bulb or dew point) temperature sensor as well as a dry-bulb temperature sensor within the enclosure. The humidity temperature value is used in connection with the dry-bulb temperature to generate a single error signal which is a function of both the dry-bulb and the humidity temperature values. This permits control of both enclosure temperature and enclosure humidity without abnormal cycling of the climate control system. Instead of using a sensor which directly measures the humidity temperature, the humidity temperature can be synthesized from the relative humidity and dry-bulb temperature within the enclosure.

Abstract: An air conditioner having a compressor, an outdoor fan, and two indoor heat exchangers which are connected by an electric expansion valve. During a dehumidifying operation, the opening of the electric expansion valve is decreased, thereby decompressing the refrigerant flowing from the first indoor heat exchange into the second indoor exchanger. The first and second heat exchangers thereby function as a reheater and an evaporator, respectively. The second indoor heat exchanger cools and dehumidifies the indoor air, and the first indoor heat exchanger heats the indoor air again. The indoor air, first cooled, then dehumidified, and finally re-heated, is supplied into the room. During the dehumidifying operation, a deviation (T) of the indoor temperature (Ta) from a preset indoor temperature (Ts), and a change (.DELTA.T) in the deviation (T) are detected, and the deviation (H) of the indoor humidity (Ha) from a preset indoor humidity (Hs), and a change (.DELTA.H) are also detected.