Abstract: An air conditioner/heater automatically operates in either air conditioning or heating mode by coil temperatures of indoor and outdoor heat exchangers. In air conditioning mode, the rotating speed of indoor fan motor is proportional to the ambient temperature of corresponding enclosed space, and the rotating speed of outdoor fan motor is proportional to the coil temperature of corresponding outdoor heat exchanger. In heating mode, the rotating speed of indoor fan motor is proportional to the coil temperature of corresponding indoor heat exchanger, and the rotating speed of outdoor fan motor is inversely proportional to the coil temperature of corresponding outdoor heat exchanger. With this automatic switching of operation mode, the capability of heat dissipation of condenser is always larger than the capability of heat absorption of evaporator. Hence, the operation of the air conditioner/heater is maintained at an optimum.

Abstract: In a vehicle air-conditioning system, plural electrical members such as a blower controller, servomotors and a post-evaporator temperature sensor are collectively disposed on an electrical circuit board integrally formed with an evaporator case cover for closing a side surface of an evaporator case. Therefore, a wire structure of an electrical connection or a wire harness can be made simple. Further, because an elastically deformable sensor-pressing portion for pressing the post-evaporator sensor toward an evaporator side surface is integrally formed with the evaporator case cover integrated with the electrical circuit board, a contact pressure of a temperature sensitive portion of the post-evaporator sensor onto the evaporator side surface can be maintained.

Abstract: An object of the present invention is to provide a temperature control system in a simple constitution as well as be capable of strictly controlling the temperature on the side of the process device of the fluid supplied via the pathway from the chiller device.

Abstract: The invention concerns a method and a device for variable flow heating for controlling ventilating fresh air room by room in a building. The invention is characterised in that said method provides sequential control of the air using a central management unit (48) programmed to be configured, either in a mode controlling the temperature levels in the main rooms (8) wherein it maintains the set temperature in said rooms and senses the possible complete closure of the (or all) the air outlets (5) supplying said main rooms, or at least if one of the main rooms is no longer supplied, in a mode controlling fresh air wherein it controls the opening of the air outlet(s) of each room not initially supplied during a time interval for making up for the lack of fresh air supply, and by closing the air outlets in all the other rooms during the same interval.

Abstract: An electronic system for controlling an evaporative cooler (101) away from the location of a wall-mounted control switch (301). A remotely triggered high/low module (302) is installed in a roof-mounted electrical disconnect box (114). The existing wall-mounted manually operated control switch (117) is replaced with a new control switch (301) which contains a pump selection switch (304), a fan motor selection switch (305), and a remotely triggered on/off module (303). A variety of remote control devices can then be used to control the evaporative cooler (101), such as a PLC time-clock (501), an RF keychain remote (601) and PLC transceiver (701), a PLC thermostat (801), a PLC setback thermostat (901), a PLC telephone transponder (1001), or a computer interface (1101).

Abstract: An operation control apparatus for a refrigerator performs a cooling operation by using a refrigerating compartment temperature regulator directly connected to a power-supply input terminal even if a freezing compartment temperature regulator is turned off, thereby effectively restricting an increase of the inside temperature of the refrigerating compartment.

Abstract: An improved refrigerator that combines means for directing cooling to a fresh-food compartment and a freezer compartment with a variable-capacity compressor. During fresh-food cooling the compressor volumetric capacity is reduced to match capacity of the expansion device. The means for directing cooling may be a multiple evaporators. Another option is a single evaporator with a reversing fan and flaps that respond to the direction of air flow to direct air flow between the evaporator and each compartment. Another embodiment comprises a natural-convection evaporator with dampers for directing air flow. This last embodiment also allows automatic defrost with a natural-convection evaporator.

Abstract: An air conditioning system and an air conditioning method are disclosed for quickly and effectively controlling the temperature in a room requiring cooling and keeping the room at a uniform temperature. The present invention estimates a temperature distribution in a room through a simulation and controls airflow rates and airflow directions of a plurality of fans on the basis of the simulation result. Temperature sensors are arranged at predetermined positions in a room such as a computer room. A simulation is performed on the basis of temperatures detected by the temperature sensor Sn and the current airflow rates and airflow directions of a plurality of fans to obtain a temperature distribution in the room. It is determined whether obtained temperatures are in a predetermined temperature range. As the result of such determination, at least one of airflow rate and airflow direction of a fan which covers a position being at a temperature out of the predetermined temperature range is controlled.

Abstract: A method of controlling chiller capacity in a chiller system. The method comprises the steps of: measuring entering the fluid temperature of a fluid entering a heat exchanger; measuring the fluid temperature of the fluid leaving the heat exchanger; determining a desired leaving fluid temperature; establishing chiller capacity as a function of the difference between leaving fluid temperature and the desired leaving fluid temperature; and adjusting the determined chiller capacity as a function of the difference between entering fluid temperature and the desired leaving fluid temperature.

Abstract: A heat-source-side space and two heat-use-side spaces are formed in a casing. A heat-source-side heat exchanger is contained in the heat-source-side space, and heat-use-side heat exchangers are individually contained in the heat-use-side spaces. The casing is formed with a plurality of suction ports for room air and a plurality of delivery ports for conditioned air. The suction ports and the delivery ports are individually connected to ducts communicating with rooms. The heat-source-side heat exchanger and the plurality of heat-use-side heat exchangers constitute refrigerant circuitry.

Abstract: A refrigerator that efficiently cools multiple cold spaces at different temperatures with one compressor and one condenser is disclosed. Multiple, fan equipped evaporators are in series, and an expansion valve regulates superheat from inlet to outlet of the series evaporators. Cold space temperatures are regulated with an on-off thermostat in each space. If only one fan is turned on, system performance approaches that of a single evaporator refrigerator with controlled superheat. More than one evaporator fan may be turned on for initial cooldown.

Abstract: The invention relates to a process for cooling polymerization reactors in the preparation of polyolefins, the polymerization being carried out in a first reactor and in at least one further reactor, the further reactor or reactors being connected downstream of the first reactor and each being cooled by an internal cooling circuit in which a cooling medium circulates. The invention comprises feeding cooling medium from the cooling circuit (9) of the first reactor (1) into the cooling circuit (10) of at least one further reactor (2) and taking off the same amount of cooling medium from the cooling circuit (10) of this reactor (2), cooling it and recirculating it into the cooling circuit (9) of the first reactor (1).

Abstract: A modular air handling supply system and method for producing a supply of cooled air for cooling purposes is disclosed. The modular air handling supply system includes a module container and ducting for transporting the air within said module container and a blower in operational connection with the ducting, wherein the cooled air is propelled to at least one resource or facility, each of which are located external to the module container. The system has the capability of supplying a remote resource or facility with a variable volume and temperature of cooled air.

Abstract: The object of the present invention is to provide a compression system to effectively compress contaminated gas containing water and other corrosive substances (natural gas) without suffering any adverse effects caused by toxic substances, including impurities, and which includes a path which heats the compressor using gas with a low dew-point temperature, such as water free gas or purified gas from outside the system, that is substantially free of water, or discharged gas after having been compressed by the compressor, a separator provided upstream of the suction section of the compressor, which separates water and the like from natural gas by cooling and condensation, and a dew-point maintaining arrangement for maintaining the discharged temperature of gas from the compressor above the dew-point temperature of the compressed gas when compressing natural gas from which water has been separated by the separator and characterized in that, when direct compression of the actual gas (contaminated gas) is necessar

Abstract: Disclosed is an apparatus for controlling a cooling unit, for instance, for an automatic vending machine. A condenser fan motor and an evaporator fan motor are of DC motors having high energy efficiency. The condenser fan motor is started by a gradually increasing Dc voltage, and the condenser fan motor and the evaporator fan motor are sequentially starred with a predetermined time interval.

Abstract: A vehicle air-conditioning system for achieving a comfortable blowout state of conditioned air at all times both with respect to air-conditioning load factors which change frequently, like solar radiation strength, and with respect to air-conditioning load factors which change slowly, like passenger compartment temperature, by automatic control of grill louver swing control times corresponding to different air-conditioning loads. For example, when it can be estimated that solar radiation is incident on a driver side or passenger side front or rear seat occupant, oscillating driver side and passenger side center louvers are paused at a swing end of the occupant estimated to be exposed to solar radiation for a time that corresponds to the amount of cooling load. Therefore, it is possible to direct conditioned air at an occupant exposed to sun and thus improve the comfort of occupants upon whom sun is incident.

Abstract: An apparatus and method for a heat pump operating in the heating mode controls the condenser air flow rate and the condenser exiting air temperature depending in a first embodiment on the evaporator ambient temperature, and in a second embodiment, the evaporator air temperature and alternatively the condenser air flow rate or the condenser exiting air temperature, to alleviate a cold blow condition. The apparatus and method operate by sensing the evaporator ambient temperature with a sensor positioned proximate to the evaporator, and when that temperature is below a threshold value indicating a cold blow situation, determining by circuit means a modified condenser air flow rate to achieve at the same time a slower air flow and a higher air temperature, so that the cold blow condition is terminated or at least alleviated.

Abstract: A method of controlling chiller capacity in a chiller system. The method comprises the steps of: measuring entering the fluid temperature of a fluid entering a heat exchanger; measuring the fluid temperature of the fluid leaving the heat exchanger; determining a desired leaving fluid temperature; establishing chiller capacity as a function of the difference between leaving fluid temperature and the desired leaving fluid temperature; and adjusting the determined chiller capacity as a function of the difference between entering fluid temperature and the desired leaving fluid temperature.

Abstract: An air conditioner in a motor vehicle containing a refrigerant circuit, which includes an evaporator, an output-controlled compressor that is driven by an engine, a condenser and an expansion device is provided. The evaporator and the condenser are each assigned a blower for applying an air flow. To operate the air conditioner, there is provided an electronic control device which, as a function of input signals, generates output signals for driving actuators for output-controllable components of the air conditioner. For this purpose, at least two state variables of the refrigerant circuit are detected, and the cutoff function of the compressor is determined from a comparison of (i) a value, derived from the at least two state variables and relating to the current delivery rate of the compressor, with (ii) a prescribed value for the maximum delivery rate.

Abstract: A method for controlling opening/closing of cool air discharge ports of a refrigerator is disclosed. The refrigerator has a device for opening/closing the ports. The device has a member for opening/closing the ports, and a motor for driving the member. A microcomputer measures temperatures at positions in a cooling compartment, and calculates a difference between the measured temperatures. When the difference is more than a predetermined value, the motor is driven so that the member repeats opening and closing of the ports. Then, the circulation effect of the cool air in the cooling compartment is enhanced, and the temperature in the cooling compartment maintained uniform.

Abstract: In general, the present invention provides a single thermal cycling module for baking and chilling a substrate, such as a wafer, that is in thermal contact with a foil heater, a heat exchanger, and a radiation heater. The radiation heater thermally heats a fluid contained by the heat exchanger, which in turn, thermally bakes the substrate at a desired temperature. When the radiation heater is deactivated, a fluid circulates through the heat exchanger to chill the substrate. The foil heater assists the baking and chilling phases by elevating the temperature of the substrate when necessary to prevent or regulate temperature fluctuations of the substrate temperature. Both the radiation heater and the foil heater can provide several zones for varying the heat applied across the substrate, and a single fluid temperature is provided to the heat exchanger for both baking and chilling cycles.

Abstract: A vehicle air conditioning apparatus in which the larger the air conditioning cooling load in a vehicle compartment, for example, the larger the solar radiation amount, the lower the set temperature or the larger the temperature deviation between set temperature and inner air temperature, the narrower the swing ranges of swing louvers of respective center and side FACE blow outlets are set. Regardless of the swing range of the swing louvers, swing cycles of the swing louvers are set constant, and the narrower the swing ranges of the swing louvers, the slower the swing speeds of the swing louvers are set. Therefore, annoying feeling is reduced, and comfortable feeling for passengers is significantly improved.

Abstract: A refrigeration system is disclosed in which temperature regulation and energy efficiency are improved. Each compartment to be cooled is provided with a variable speed fan, the speed of which is controlled dependent on that compartment's temperature, the temperature required of that compartment, and the difference between required and actual temperatures for any other compartments. The temperatures are monitored continually and fan speeds altered so that the compartment furthest from its required temperature receives the most cooling (highest fan speed). An alternative embodiment is also disclosed wherein the speed of one compartment's fan is fixed and the other varied.

Abstract: A method and system for automatically controlling a heating, ventilation and air-conditioning (HVAC) system of a vehicle in order to achieve thermal comfort of an occupant of the automotive vehicle receives a plurality of input signals representative of ambient temperature, sunload, and a set-point temperature. A desired amount of HVAC Work necessary to achieve thermal comfort is determined based on either a target temperature or a model of an occupant's thermal comfort. A controller controls the HVAC system based on the desired amount of HVAC Work.

Abstract: An air conditioning system for a cabin of a vehicle having a rear hatch. The air conditioning system has a sun radiation sensor for detecting a sun radiation amount into a rear part of the cabin and an air conditioning means for providing air conditioning at a rear seat section of the cabin in accordance with the sun radiation amount detected by the sun radiation amount sensor. The sun radiation amount sensor is mounted on the rear hatch in such a manner that the sun radiation sensor moves together with the movement of the rear hatch. A sensor for detecting if the rear hatch is open or closed is provided. A sun radiation amount detected by the sun radiation sensor during a closed condition of the rear hatch is memorized. When it is detected that the rear hatch is opened, the air conditioning, by the air conditioning means of the rear seat section, is done based on the memorized value of the sun radiation amount just before the rear hatch was opened.

Abstract: A method and apparatus for cooling different media which separately control the temperature of a plurality of chambers. A common refrigerant is used for cooling the different media.

Abstract: A refrigerator having freezing and refrigerating compartments and a refrigerating H.M. cycle and a control method therefor, comprises a compressor for compressing refrigerant, a condenser for condensing refrigerant, a capillary tube for expanding refrigerant, a first evaporator mounted in the refrigerating compartment and a second evaporator mounted in series to the first evaporator in the freezing compartment; the freezing and refrigerating compartments divided from each other to be cooled, separately, a first fan mounted in the refrigerating compartment to circulate air passing through the first evaporator, a second fan mounted in the freezing compartment to circulate air passing through the second evaporator, and a control portion for controlling the operation of the compressor and the freezing and refrigerating fans, thereby performing both compartments to be maintained at the constant temperature.

Abstract: A refrigeration appliance and control system for efficiently operating the evaporator and condenser fan motors of the refrigeration appliance to reduce the total energy consumed by the appliance are disclosed. The control system operates to turn the evaporator fan motor on only after the evaporator has cooled to its operating temperature to avoid premature and inefficient use of the evaporator fan motor. The control system also permits the evaporator fan motor to continue running after the compressor is turned off to utilize the residual cooling capacity of the evaporator. In an embodiment, a secondary control system also operates to turn a condenser fan motor on only after the condenser reaches its operating temperature and operates to turn the condenser fan motor off only after the compressor is turned off and the condenser cools to a shutoff temperature below its operating temperature.

Abstract: A control method and a cook-chill system of a refrigerator/freezer combination which preserves for a long time the taste of foodstuffs after a cooked foodstuff is refrigerated rapidly and is stored by supplying a lot of chilling air of a freezing chamber into a cook-chill chamber are disclosed. The cook-chill chamber has a three-dimensional storage space for chilling rapidly and preserving cooked foodstuffs, has a first chilled air inlet hole connected with a first chilling air duct which is prolonged from a freezing chamber of which one side of the upper side has a second chilled air inlet hole connected with a second chilling air duct which is prolonged into a refrigerating chamber from a freezing chamber.

Abstract: A method of controlling fans in a rooftop air conditioning unit. The method comprises the steps of: determining a measure of compressor operating capacity; calculating an indoor fan speed as a function of that capacity; maintaining a fixed relationship between the indoor fan speed and an outdoor fan speed; and controlling the indoor fan in accordance with the calculated indoor fan speed.

Abstract: Disclosed is a method for controlling a quick cooling function of a refrigerator. When both compartments are at an abnormal temperature state in a refrigerator the method independently controls a freezer compartment and a refrigerating compartment. The user selects a quick cooling function for any compartment. This method preferentially controls only selected compartment temperature, reducing the time needed to quickly cool the selected compartment, and thus reducing power-consumption.

Abstract: A method and system for automatically controlling a heating, ventilating, and air conditioning (HVAC) unit of a vehicle includes multiple electric motors for actuating multiple respective doors directing air flow through the HVAC unit and temperature of the air flow. A plurality of sensors sense a plurality of temperatures. A controller determines a desired temperature and desired direction of air flow based on the plurality of temperatures. The controller also controls the multiple electric motors so that their respective doors move at the same time while preventing preselected doors from operating at the same time based on the desired temperature and desired direction of air flow.

Abstract: A refrigerator includes first, and second compartments cooled to different temperatures. A first evaporator and first fan are provided in the first compartment, and a second evaporator and second fan are provided in the second compartment. A first switch controls the supply of electrical power to a compressor, the first fan, and the second switch. The second switch is operable to turn on/off the second fan while power is supplied to the compressor and first switch.

Abstract: A refrigerator includes a compressor, and freezing and refrigerating compartments, each compartment having its own evaporator and fan. Only one of those fans can be operated at any given time. To operate the refrigerator, an actual temperature of a first of the compartments (either the freezing compartment or the refrigerating compartment) is compared with a reference temperature. If the actual temperature is lower than the reference temperature, then neither of the fans is operated. If the actual temperature is greater than the reference temperature, then an actual temperature of the second compartment is compared with a reference temperature. If the actual temperature of the second compartment is higher than its respective reference temperature, then the fan of only the second compartment is operated; otherwise, the fan of only the first compartment is operated.

Abstract: A swimming pool room air conditioner has a duct with an inlet return for air drawn from the pool room and a supply air blower downstream from the inlet of the duct for the blower to draw air through the duct and supply it to the pool room after the air is conditioned. The duct inlet, an evaporator coil for cooling and dehumidifying return air, an air reheat condenser coil and the supply blower are arranged in the duct in the stated order. A motor controlled damper is arranged for bypassing return air around the evaporator coil and thereby cause a predetermined humid return air flow over the evaporator. An exhaust blower is provided. A motor controlled warm air damper is arranged for allowing the exhaust blower to draw a fraction of the return air before the return air flows over the dehumidifier evaporator coil and discharges the fraction to outdoors. A cool air damper is arranged for the exhaust blower to exhaust a fraction of the cooled air to the outdoors.

Abstract: An air conditioner capable of separately controlling the temperatures of the conditioned air blown to first and second air conditioning zones and making respective blowing modes be common on both air passage sides, wherein the target blowing temperature is determined from the necessary blowing temperature corresponding to respective blowing modes and the opening degree of the air mix door is controlled based on said target blowing temperature, thereby the blowing temperature to the respective air conditioning zones in the respective modes being within a range of temperatures that cause no feeling of discomfort to an air conditioner user in the respective blowing modes.

Abstract: An electronic controller for a room air conditioner includes a memory for storing operational parameters, a thermistor for measuring ambient temperature, and a microprocessor capable of calculating the difference between the ambient temperature and the temperature set point, and capable of controlling the speed of the fan and fan motor based on the difference between the ambient temperature and the temperature set point. The controller includes an electronic system clock, an electronic control panel with a display, the ability to store in memory a start time for normal operation of the room air conditioner and a stop time for ending normal operation of the room air conditioner, and a timer mode activation device.

Abstract: An air conditioner having an indoor unit and an outdoor unit. The indoor unit has a compressor, an indoor heat exchanger, and a indoor fan. The outdoor unit has an outdoor heat exchanger, a capillary tube, and an outdoor fan. In use, the indoor unit is connected to a commercial AC power supply. A driving circuit is provided in the indoor unit, for applying a voltage via a power-supply line to the outdoor unit to drive the outdoor fan. This voltage is lower than the voltage of the commercial AC power supply. Thus, the power-supply line can be connected to the indoor and outdoor units, with ease and in safety.

Abstract: A method and apparatus for coupling a primary loop with a secondary loop for circulating processing fluids therebetween comprising in combination: a first connection for the feed line of the primary loop and a second connection for the return line of the primary loop; a third connection for the feed line of the secondary loop and a fourth connection for the return line of the secondary loop; a crossover line coupling the four connections; first valve means for controlling the flow through the secondary loop; first sensor means responsive to the temperature associated with the secondary loop to control the first valve means; second valve means in the path of flow through the crossover line; and second sensor means responsive to the flow of the process fluid across the crossover line to control the second valve means.

Abstract: The present invention relates to an operational control method and apparatus for an air conditioner in which a rotary speed of an outdoor fan motor is controlled according to a rotary speed of an indoor fan motor, to thereby perform cooling or heating operations thereof. The apparatus includes a zero voltage detector for detecting a zero potential of a commercial alternating current voltage, a controller for controlling an overall operation by being synchronized with the zero potential of the commercial alternating current voltage detected by the zero voltage detector, an indoor fan motor driver for driving an indoor fan motor according to control of the controller, an indoor fan speed detector for detecting a rotary speed of the indoor fan motor driven by the indoor fan motor driver, an outdoor fan motor driver for driving an outdoor fan motor according to control of the controller, and an outdoor fan speed detector for detecting a rotary speed of the outdoor fan motor driven by the outdoor fan motor driver.

Abstract: An air conditioning system suitable for use in an electric vehicle. In the air conditioning system, a refrigerant gas circulatory system of the heat pump type for selectively effecting cooling and heating is disposed inside the electric vehicle and comprises lines which interconnect three heat exchangers, a directional control valve, a compressor and an expansion valve to one another. A control device is provided so as to activate and inactivate the heat exchanger, the directional control valve and the compressor. Before the expected running of the vehicle, at least a portion of the refrigerant gas circulatory system can be operated by the control device using a drive source different from the drive source used for running the vehicle. Accordingly, a comfortable room environment can be established for the expected time on riding by activating the air conditioning system in an unmanned state.

Abstract: A refrigerated container is provided which has a refrigeration system and a controlled atmosphere system. The refrigeration system and the controlled atmosphere system are both provided with electronic controllers. The refrigeration controller is programmed with certain acceptable conditions under which the controlled atmosphere system will be allowed to operate. When these conditions are satisfied the refrigeration controller will send an enabling signal to the controlled atmosphere systems controller allowing it to operate. If at any time during operation the refrigeration controller determines that the controlled atmosphere system should not operate, it removes the electrical enabling signal, causing the controlled atmosphere system to stop.

Abstract: A method for controlling operation of a system for controlling the atmosphere within a confined space. The system has an electrical control having a display and electrically controlled components. The components include an air compressor, a filter, an air heater, a separator for dividing air into streams of oxygen and nitrogen, and flow control valves for varying the purity of the nitrogen stream. The system also includes sensors for indicating the temperature leaving the heater and the temperature within the confined space. A sensor indicates the pressure upstream of the control valves. An oxygen sensor and a carbon dioxide sensor are included.

Abstract: A refrigeration system for providing cooling to two or more compartments utilizing respective first and second evaporators. During the initial operation of a cooling cycle, the refrigerant is utilized for cooling the compartment (such as a fresh food compartment) which is to be maintained at a higher temperature as compared with another compartment (such as a freezer compartment). Cooling can thus be achieved by operating a fan in the fresh food compartment, even where the refrigeration system has not yet reached steady state after the compressor initially begins operating. After cooling has been achieved in the fresh food compartment, the refrigerant in the system has reached a state suitable for cooling of the freezer compartment, and the fan for the freezer evaporator is turned on while the fan for the fresh food compartment is turned off.

Abstract: A heat pump type air conditioner for an automotive vehicle has a compressor to which an outer heat exchanger and a first inner heat exchanger are connected through a three-way valve. The outer heat exchanger is connected at its refrigerant outlet to the first inner heat exchanger through one-way valve. The refrigerant outlet of the first inner heat exchanger is connected to a second inner heat exchanger through an expansion valve. The refrigerant outlet of the second inner heat exchanger is connected to the compressor. The second and first inner heat exchangers are disposed in turn downstream of a blower for generating an air flow for air-conditioning a passenger compartment of the vehicle. During a cooling drive the three-way valve is set to lead the refrigerant from the compressor to the outer heat exchanger. During a heating drive the three-way valve is set to direct the refrigerant from the compressor to the first inner heat exchanger while bypassing the outer heat exchanger.

Abstract: A rotational speed of a fan is maintained at a preset one when an angle of a flap is at a maximum air-flow angle, increased by a specified value when the angle of the flap has been changed by a specified angle in the direction away from the position of the maximum air-flow angle, and decreased by a specified value when the angle of the flap has been changed by a specified angle in the direction toward the position of the maximum air-flow angle. It is possible to prevent any occurrence of condensation and air-flow pulsating noise without needing any complex control such as load response control and yet without requiring any complicate construction in the flap.

Abstract: A method and apparatus for coupling a primary loop with a secondary loop for circulating processing fluids therebetween comprising in combination: a first connection for the feed line of the primary loop and a second connection for the return line of the primary loop; a third connection for the feed line of the secondary loop and a fourth connection for the return line of the secondary loop; a crossover line coupling the four connections; first valve means for controlling the flow through the secondary loop; first sensor means responsive to the temperature associated with the secondary loop to control the first valve means; second valve means in the path of flow through the crossover line; and second sensor means responsive to the flow of the process fluid across the crossover line to control the second valve means.

Abstract: An air condition control apparatus includes: a thermal sensation estimating device for estimating an actual thermal sensation on the basis of the history of a thermal sensation information in a predetermined period output from an indirect thermal sensation information detecting device for detecting information relating to a thermal sensation in the vicinity of a human in a room; a control pattern storage device for storing a predetermined thermal sensation control pattern for achieving a target thermal sensation; a control value determining device for determining control values of air to be supplied into the room so that the thermal sensation output from the thermal sensation estimating device coincides with the stored thermal sensation control pattern; an air condition control device for controlling the temperature of the air to be supplied into the room, on the basis of the control value output from the control value determining device; and an air blower for supplying the temperature-controlled air into the

Abstract: In a heating, ventilation and air conditioning system such as a heat pump having a multi-zone hydronic thermal distribution system or such as an air conditioner, a novel condensate removal apparatus removes condensate from each zone fan coil. Each fan coil uses a valve to drain condensate from a fan coil drip pan into a drainage conduit. The drainage conduits from each valve carry condensate to a tank. The tank acts as a manifold for fluid collection from the different fan coils. A single pump draws condensate from fan coils through drainage conduits to the tank. This same pump draws a vacuum in the tank and the drainage conduits. The pump uses a single outlet conduit to discharge condensate.

Abstract: Methods of monitoring the operation of a refrigeration system, including interlocking the selection and operation of an engine and electric motor which are arranged to alternatively function as prime movers for a refrigerant compressor; detecting slippage of a clutch connected between the engine and compressor; and, detecting improper rotational direction of an evaporator fan motor. The interlocking method prevents energization of the drive motor while the engine is operative, and it includes monitoring engine oil pressure and engine RPM. The clutch slippage method includes detecting engine speed fluctuations and the polarity of battery current. The monitoring of the evaporator fan motor, which drives a fan which draws return air RA from a conditioned space, and discharges conditioned air DA into the conditioned space, includes the steps of comparing the difference between the temperatures RA and DA of the return air and discharge air with a predetermined reference value.