Abstract: An air conditioning system includes an evaporator, compressor, condenser and an expansion system in a closed system to cycle refrigerant. The components are mounted in a housing with sidewalls, bottom wall and top wall in a vertically stacked configuration with a horizontally mounted frame approximately bisecting the housing. A fan below the frame dissipates heat into or through the bottom of a vehicle and a fan above the frame circulates cool air into a passenger compartment. The air conditioning system is powered by a 12-volt direct current, which is fused (15 amperes) running off the vehicle's battery or the alternator and is operated by an electronic control circuit.

Abstract: A system or method can be used to monitor operations of a heat exchanger, such as a condenser of an air conditioning system, that includes a header plate. A temperature sensor can be secured to the header plate to measure a temperature of the header plate as a proxy for a temperature or a pressure of a working fluid of the heat exchanger.

Abstract: A transportation refrigeration unit includes an evaporator circulating a flow of refrigerant therethrough to cool a flow of supply air flowing over the evaporator, a first compressor operably connected to an engine and driven by the engine, a second compressor operably connected to a battery and driven by the battery. The first compressor and/or the second compressor are in fluid communication with the evaporator to compress the flow of refrigerant and configured and connected in parallel with one another. A condenser is in fluid communication with the evaporator and the first compressor and/or the second compressor.

Abstract: One aspect, as provided herein, is directed to a multi-stage fluid control system for a fluid source heat pump system. This embodiment comprises compressors configured to operate as separate, heat exchange stages, condensers each being fluidly coupled to at least one of the compressors by refrigerant tubing and having intake ends coupled together by a fluid intake manifold. This embodiment further includes output conduits coupled to each of the condensers and that are couplable to a distal location. Further included is a modulating valve control system interposed the output conduits. The modulating valve control system is configured to stage a flow of fluid through the condensers based on a number of operating compressors.

Abstract: A vehicle air-conditioning apparatus includes a refrigerant circuit including a heat exchanger, a fan which sends air to the heat exchanger, and a controller which controls the refrigerant circuit and the fan. The vehicle air-conditioning apparatus is mounted on a vehicle. The controller determines if a position of the vehicle or a speed of the vehicle satisfies a predetermined condition. The controller acquires a physical quantity, the physical quantity having already been correlated with a clogging amount of the heat exchanger and the correlation being dependent on whether the predetermined condition is satisfied. The controller determines whether or not clogging occurs in the heat exchanger based on the physical quantity.

Abstract: A refrigerator includes a first compressor configured to compress a first refrigerant, a first condenser configured to return the first refrigerant to the first compressor during a freezing cycle, a second compressor configured to compress a second refrigerant, and a second condenser configured to return the second refrigerant to the second compressor during a refrigerating cycle. The refrigerator includes a controller configured to control a radiating fan for the first condenser and the second condenser based on an operation state of the first compressor and the second compressor, and a refrigerant loop channel configured to allow the first refrigerant passing through a refrigerant channel that is located between a body and a door of the refrigerator. The refrigerant channel is coupled to the first condenser, and, for a predetermined time interval, an average operation time of the freezing cycle is longer than an average operation time of the refrigerating cycle.

Abstract: A cooling system is provided and includes pump, condenser fan, and control modules. The pump module controls a pump to pump a cooling fluid through a cooling circuit. The condenser fan module controls a condenser fan to transfer air across a condenser of the cooling circuit. The control module, while operating in a pumped refrigerant economizer mode or a mixed mode, determines a requested CFC percentage. The pump module activates the pump if the requested CFC percentage is greater than or equal to a predetermined CFC percentage. The condenser fan module: if the requested CFC percentage is greater than or equal to the predetermined CFC percentage, activates the condenser fan or operates the condenser fan at least at a minimum speed; and based on the requested CFC percentage, adjusts a speed of the condenser fan between the minimum speed and a maximum permitted speed to provide the requested CFC percentage.

Abstract: According to one embodiment, an electrical equipment housing includes a first storage room, an air conditioner, a second storage room, a temperature sensor, and a heater. The first storage room contains a power converter converting electrical power. The air conditioner adjusts a temperature inside the first storage room. The air conditioner includes an indoor unit and an outdoor unit. The indoor unit is provided inside the first storage room. The outdoor unit is provided outside the first storage room. The second storage room contains the outdoor unit. The temperature sensor senses a temperature inside the second storage room. The heater heats inside the second storage room when the temperature sensed by the temperature sensor is a lower limit or less.

Abstract: An air conditioner for a vehicle includes a pump that draws and discharges a heat medium, a cooler core that exchanges sensible heat between the heat medium and ventilation air into a vehicle interior to cool and dehumidify the ventilation air, a heat-medium and outside-air heat exchanger that exchanges sensible heat between the heat medium and outside air, a compressor adapted to draw and discharge a refrigerant in a refrigeration cycle, a heat-medium cooling heat exchanger that cools the heat medium by exchanging heat between a low-pressure side refrigerant in the refrigeration cycle and the heat medium, and first and second switching valves that switch between a first dehumidification mode for circulation of the heat medium between the cooler core and the heat-medium cooling heat exchanger and a second dehumidification mode for circulation of the heat medium between the cooler core and the heat-medium and outside-air heat exchanger.

Abstract: A method for reducing energy consumption by a medium heating device, the method comprising the step: scheduling an operation (501) of the first device (111) requiring heating of a first medium; scheduling an operation (502) of the second device (112) requiring heating of a second medium; the method being characterized in that it further comprises the steps of: sending (504), from the first device (111), information regarding its operation cycles and water parameters to the second device (112); rescheduling (505) operations of the liaised devices (111, 112) so that drain heat of the first medium is reused to heat a fresh intake of the second medium by the second device by means of a heat exchanger (160); instructing (506), the reprogrammed devices (111, 112) to start their operations according to the new schedule.

Abstract: A method of maintaining a fluid flow rate in a heating, ventilating, air conditioning, and refrigeration (HVAC-R) system while maintaining superheat in the HVAC-R system at a desired level includes: continuously measuring an operating fluid temperature of the HVAC-R system and calculating superheat at a pre-determined rate, determining if the calculated superheat is stable, measuring and recording an operating fluid pressure of the system each time the calculated superheat is stable, recording an average operating fluid pressure each subsequent time the superheat is stable, calculating an output PWM and reducing fluid flow through a metering valve when an actual PWM is greater than the calculated output PWM by adjusting a PWM signal to a microvalve in the metering valve, and increasing fluid flow through the metering valve when the actual PWM is less than the calculated output PWM by adjusting the PWM signal to the microvalve.

Abstract: A control device, and a method for operating the control device, optimizes cooling of a high-voltage accumulator using an air-conditioning system in a vehicle. A coolant flow which is insufficient is detected by an evaporator for the high-voltage accumulator and, as a result, heat losses inside a condenser of the air-conditioning system are reduced for increasing the flow of the coolant.

Abstract: A refrigeration cycle apparatus includes a compressor, a condenser, a first subcooling device that subcools a refrigerant by exchanging heat with the air, a second subcooling device that performs a heat exchange between refrigerant streams that have been branched by a branch pipe, thereby subcooling one of the refrigerant streams, a flow control device that adjusts a flow rate of the second stream of the refrigerant and passes this refrigerant through the second subcooling device, a bypass path that allows the refrigerant passing through the flow control device and the second subcooling device to flow therethrough, an expansion valve, an evaporator, and a controller configured to control an amount of heat exchanged in the first subcooling device and an amount of heat exchanged in the second subcooling device based on a temperature of the air.

Abstract: A demand-response system includes first and second aggregators and a power aggregator. The first aggregator performs demand-response-related control of a first heating device group including a heat pump device, and the second aggregator performs demand-response related control of a second heating device group. The power aggregator sends a second power adjustment request to the first and second aggregators using a command being common to the first and second aggregators. In accordance with the second power adjustment request, the first aggregator performs demand-response-related control of the first heating device group using a first dedicated command, and the second aggregator performs demand-response-related control of the second heating device group using a second dedicated command that is different from the first dedicated command.

Abstract: Provided is a method for controlling an operation of a refrigerator. Different operation modes are selected according to whether a refrigerator door is opened and closed, and according to an inner temperature and an ambient noise. Freezing capacity of a compressor, the number of rotations of an evaporator fan, and the number of rotations of a condenser fan are varied in conjunction with one another, to reduce a noise.

Abstract: Disclosed is a control method of an air conditioner system for a vehicle. The air conditioner system is integrated with a cooling system and includes a water-cooled condenser embedded in an intercooler radiator and an air-cooled condenser placed in front of the intercooler radiator. The control method may include (A) circulating the refrigerant in the air conditioner system through actuation of a compressor by sensing actuation of an air conditioner while driving the vehicle in a state in which the start of the vehicle is on, (B) actuating a water pump circulating the cooling water and a cooling fan blowing wind to a cooling module, and (C) controlling the actuation of the compressor by judging whether the vehicle is in a failure mode in a state where the air conditioner is actuated or normally driving the compressor and the cooling fan and ending the control.

Abstract: This patent is directed to an external air conditioning system connected to a parked airplane. The system has multiple refrigeration units. Each refrigeration unit has a controller. Each refrigeration unit's controlled is linked to a common controller. A single stream of air flows through all of the evaporators in series. Each of the refrigeration units has multiple compressors. Additional compressors are activated or deactivated based on refrigerant pressure. The activation or deactivation pressures are staggered across the refrigeration units, thus coordinating operation of the multiple refrigeration units.

Abstract: The invention relates to a system that is functionally associated with a refrigeration unit (1), said system comprising a primary tank (6) for the inflow of the water to be treated, and an inner tank (7) for cooling and mixing the water. Said tank (7) contains an exchanger (13) through which the liquid gas from the refrigeration unit (1) is passed, at the same time as the water entering the primary tank (6) accesses the cooling and mixing tank (7) from the primary tank, said cooling and mixing tank comprising water suction tubes (23) that converge in a three-way valve (25) connected to a water recirculation pump (15) via which the water is driven inside the exchanger (13). The treated water leaves via an outflow line (27).

Abstract: Described herein is a automotive air-conditioning system configured to implement a sub-critical refrigerating cycle and comprising a condenser and a fan associated thereto, a compressor, an evaporator, an expansion valve of the non-electronically-controlled type, and an electronic control system configured to receive a signal indicative of the ambient temperature outside the vehicle and to generate a control signal for the fan of the condenser on the basis of the ambient temperature outside the vehicle.

Abstract: An air conditioning system includes a plurality of indoor units and one or more outdoor units to drive the indoor units. The one or more outdoor units are coupled to the indoor units through refrigerant pipes that include one or more branch points. A calculator calculates an amount of filling refrigerant based on capacities of the indoor units and the one or more outdoor units and lengths of the refrigerant pipes.

Abstract: A cooling system has a cooling circuit that includes an evaporator disposed in a cabinet, a condenser, a compressor, an electronic expansion valve and a liquid pump. a direct expansion mode and a pumped refrigerant economizer mode. When the cooling system is in the pumped refrigerant economizer mode, the controller controls a temperature of the refrigerant to a refrigerant temperature set point by regulating a speed of a fan of the condenser, controls a temperature of air in a room in which the cabinet is disposed to a room air temperature setpoint by regulating a speed of the liquid pump, and maintains a pressure differential across the liquid pump within a given range by regulating an open position of an electronic expansion valve.

Abstract: A vehicle-integrated water harvesting system is provided that enables water-vapor or condensation in a vehicle to be captured, and made available onboard the vehicle for drinking or other uses. The system includes a water emitting component and may include a purification system operatively connected to the water emitting component. The purification system at least partially purifies the water and then sends the purified water to a storage reservoir or directly to a dispenser or outlet.

Abstract: A hybrid heating apparatus heats potable water with waste heat from heat recovery units and insolation from solar collectors. A single circulation pump circulates fluid between at least one heat exchanger and each of the heat recovery units and preferably the solar collector. A single controller receives sensor readings from the heat recovery units and the solar collector units and receives a demand to heat the potable water. To satisfy the demand, the controller determines the extent to which the demand may be satisfied from heat available from the heat recovery units and the solar collector units and sends command signals both to the circulating pump to circulate the fluid and to appropriate ones of valves at connections to those heat recovery units and solar collector units to allow fluid to circulate to be heated to flow to the heat exchanger for effecting heat exchange to heat the potable water.

Abstract: An HVAC system for a motorized vehicle or vessel is provided that includes a variable-speed compressor, a variable-speed condenser fan and a variable-speed evaporator fan. The HVAC system further includes a DC-power system for supplying DC power to the variable-speed compressor, the variable-speed condenser fan and the variable-speed evaporator fan regardless if the mobile unit's engine is operating or not operating. A controller and an operator interface are also provided for controlling the operation of the HVAC system.

Abstract: In a cooling system, particularly a cooling system for motor vehicles, including a cooling circuit and a refrigerating circuit which are coupled to one another via a refrigerant/coolant heat exchanger and a third medium/coolant heat exchanger arranged in the cooling circuit, a heat source to be cooled is arranged in the cooling circuit and means are provided for controlling the quantity of coolant flowing through the refrigerant/coolant heat exchanger.

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 refrigerator includes a compressor compressing a refrigerant, a first liquid heat exchanger performing heat exchange between the refrigerant and a first liquid heat medium, an expander expanding the refrigerant, a second liquid heat exchanger performing heat exchange between the refrigerant and a second liquid heat medium, an air heat exchanger performing heat exchange between the refrigerant and air, a blower sending air to the air heat exchanger, a refrigerant flow rate regulator regulating a flow rate of the refrigerant of the first liquid heat exchanger, the second liquid heat exchanger and the air heat exchanger, a pressure sensor detecting a pressure value of the refrigerant of the air heat exchanger, a target pressure value setter setting a target pressure value of the refrigerant of the air heat exchanger in accordance with a target temperature value of the first liquid heat medium, and a blower controller controlling the blower so that the detection value of the pressure sensor becomes the target p

Abstract: A refrigeration system can incorporate a cooling-liquid injection system that can inject a cooling liquid into an intermediate-pressure location of the compressor. The cooling liquid can absorb the heat of compression during the compression of the refrigerant flowing therethrough. The refrigeration system can include an economizer system that injects a refrigerant vapor into an intermediate-pressure location of the compressor in conjunction with the injection of the cooling liquid. A refrigeration system can include a liquid-refrigerant injection system that can inject liquid refrigerant into an intermediate-pressure location of the compressor. The injected liquid refrigerant can reduce the discharge temperature of the refrigerant. The liquid-refrigerant injection system can be used with the cooling-liquid injection system and/or the economizer system.

Abstract: A vehicle air-conditioning system provided with a refrigeration cycle system is provided. The air-conditioning system includes an evaporator outlet air target temperature setting unit which sets the target temperature of air at an outlet of an evaporator at a predetermined temperature greater than or equal to a minimum temperature which is set for preventing freezing of the evaporator. The target temperature setting unit controls the predetermined temperature to the minimum temperature when the vehicle speed is lower than or equal to a predetermined vehicle speed.

Abstract: A water-cooled auxiliary condenser device 200 receives refrigerant from an external refrigeration system 210 just downstream from its air-cooled condenser 110. The refrigerant passes through a water-cooled condenser 250, and the refrigerant state is sensed by a temperature or pressure sensor 226. If the sensed state of the refrigerant rises above a first threshold, the flow of water through the water-cooled condenser 250 is increased, e.g., turned ON, using a controllable water valve 234. When the sensed state of the refrigerant drops below a second threshold, the water flow through the water-cooled condenser 250 is decreased, e.g., turned OFF. The refrigerant returns to the refrigeration system just upstream from its liquid receiver 120. In the event that air-cooled condenser 110 fails, device 200 automatically activates the water-cooled condenser 250 to maintain safe refrigeration temperatures in the appliance. When not required, device 200 remains passive and does not use any water or electric.

Abstract: Multi-unit air conditioner and method for controlling the same, the multi-unit air conditioner including a plurality of outdoor heat exchangers, a plurality of outdoor fans for cooling the outdoor heat exchangers, and control means for controlling rotation speeds of the outdoor fans, to control a gas/liquid refrigerant mixing ratio introduced into the gas-liquid separator through the outdoor heat exchangers, thereby optimizing the mixing ratio of the refrigerant introduced to a gas-liquid separator proper to an operation condition, for improving an air conditioning efficiency.

Abstract: An outdoor unit includes a pulse width modulation compressor, an outdoor heat exchanger. First and second outdoor fans are positioned near to the outdoor heat exchanger. The operation modes of the first and second outdoor fans are determined in accordance with the amount of refrigerant discharged from the compressor and external conditions. An outdoor temperature sensor is electrically connected to the input port of the outdoor control unit, and first and second outdoor fan operating units for respectively operating first and second outdoor fans are connected to the output port of the outdoor control unit. The outdoor control unit operates the first and second fans in a preset operation mode by confirming outdoor temperature data input from the outdoor temperature sensor and the loading time of the compressor and controlling the first and second outdoor fan operating units.

Abstract: The present invention provides a cooling fan control device configured to use a single cooling fan instead of a double cooling fan for cooling an air conditioner and a radiator. The cooling fan control device comprises a vehicle operation state detecting unit; an electronic control unit to output a cooling fan control signal according to a preset program; a first power supply unit for supplying a high fan speed driving power to a cooling fan motor; and a second power supply unit for supplying a low fan speed driving power to the cooling fan motor according to the cooling fan control signal output from the electronic control unit.

Abstract: In an automotive air conditioning system according to the present invention, a thin condenser 2 of a condensing unit portion 10 installed on a flat roof of a vehicle such as a bus is provided in such a manner as to be inclined downwardly from the front toward the rear of the vehicle, condenser fans 4 are provided directly above the condenser, and an air inlet 51 to the condenser is disposed in front of the condenser whereas air outlets 52 are disposed above the condenser.

Abstract: Multi-unit air conditioner and method for controlling the same, the multi-unit air conditioner including a plurality of outdoor heat exchangers, a plurality of outdoor fans for cooling the outdoor heat exchangers, and control means for controlling rotation speeds of the outdoor fans, to control a gas/liquid refrigerant mixing ratio introduced into the gas-liquid separator through the outdoor heat exchangers, thereby optimizing the mixing ratio of the refrigerant introduced to a gas-liquid separator proper to an operation condition, for improving an air conditioning efficiency.

Abstract: In an automotive air conditioning system according to the present invention, a thin condenser 2 of a condensing unit portion 10 installed on a flat roof of a vehicle such as a bus is provided in such a manner as to be inclined downwardly from the front toward the rear of the vehicle, condenser fans 4 are provided directly above the condenser, and an air inlet 51 to the condenser is disposed in front of the condenser whereas air outlets 52 are disposed above the condenser.

Abstract: An outdoor unit includes a pulse width modulation compressor, an outdoor heat exchanger. First and second outdoor fans are positioned near to the outdoor heat exchanger. The operation modes of the first and second outdoor fans are determined in accordance with the amount of refrigerant discharged from the compressor and external conditions. An outdoor temperature sensor is electrically connected to the input port of the outdoor control unit, and first and second outdoor fan operating units for respectively operating first and second outdoor fans are connected to the output port of the outdoor control unit. The outdoor control unit operates the first and second fans in a preset operation mode by confirming outdoor temperature data input from the outdoor temperature sensor and the loading time of the compressor and controlling the first and second outdoor fan operating units.

Abstract: A control method and device for controlling the operation of various components of a refrigeration system provides more efficient operation of those components. Energization of the compressor is delayed upon power interruption, and high pressure is relieved through operation of a valve. The compressor runs is energized if the cabin temperature exceeds a specified temperature for a predetermined length of time, is is de-energized if the cabin temperature drops below a specified temperature. The condenser fan is energized based on the temperature of the condenser coil inlet and the ambient temperature. The evaporator fan is energized based on the cabin temperature and the temperature of the evaporator coil outlet.

Abstract: An apparatus and method for controlling the temperature of an integrated circuit device includes a refrigerant system having a coolant loop containing refrigerant, an evaporator, a compressor, and a condenser. The condenser has a variable speed fan controlled to maintain the temperature of the refrigerant at a predetermined value. In a refrigeration system used to cool an integrated circuit device, a method for controlling refrigerant pressure by comparing the refrigerant temperature at a predetermined location to a predetermined value and varying the cooling applied to the condenser.

Abstract: An apparatus and method for controlling the temperature of an integrated circuit device includes a refrigerant system having a coolant loop containing refrigerant, an evaporator, a compressor, and a condenser. The condenser has a variable speed fan controlled to maintain the temperature of the refrigerant at a predetermined value. In a refrigeration system used to cool an integrated circuit device, a method for controlling refrigerant pressure by comparing the refrigerant temperature at a predetermined location to a predetermined value and varying the cooling applied to the condenser.

Abstract: In a heat-pump water heater, a control unit has a heat-radiation determining means for determining a heat radiation from refrigerant to outside air in an air heat exchanger based on a water temperature flowing into a water heat exchanger, and the control unit selectively performs a general cycle operation and a bypass operation in accordance with a determination result of the heat-radiation determining means. That is, when the water temperature flowing into the water heat exchanger is lower than 60° C., the general cycle operation is performed. On the other hand, when the water temperature is equal to or higher than 60° C., the bypass operation is performed.

Abstract: In apparatus and method for controlling a cooling fan associated motor at a pulse duty ratio, the cooling fan is revolved by the cooling fan associated motor to cool a radiator of a vehicular engine coolant and a condenser of a refrigerant of a vehicular air conditioner and the duty ratio for the cooling fan associated motor is controlled in such a manner that a sum of a torque required for a generator to drive the cooling fan associated motor and a torque required to drive a compressor of the air conditioner is minimized while satisfying a control demand for a coolant temperature and a refrigerant pressure so that the cooling fan associated motor is driven at the duty ratio.

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 device for air conditioning a motor-vehicle passenger compartment, a control module adjusts electrical power supplied to a motor-driven fan unit delivering airflow to a condenser of the device. Means are furthermore provided for recording an air throughput passing over the condenser and produced, at least in part, by the motor-driven fan unit. A regulation module estimates a maximum value of the electrical power supply to the motor-driven fan unit, for a given air throughput, with a view to limiting the electrical power supply to this maximum value, as a function of the air throughput.

Abstract: In a heating and air conditioning installation for a motor vehicle, the refrigerant fluid circuit includes a cooling (air conditioning) loop including a condenser, and a heating loop. In order to detect excess pressure in the refrigerant fluid in the condenser, during corrective discharges of the fluid to the condenser from the heating loop, the frequency of occurrence of these discharges is monitored continuously, and an evaluation is made as to whether the measured frequency exceeds a threshold value. The outlet pressure of the compressor is also monitored continuously, an evaluation being made as to whether the measured pressure exceeds a predetermined demand pressure by an excess value over a given period of time.

Abstract: A temperature control zone enclosure for exterior compressor/condensers has been developed to serve as a means of protecting the compressor/condensers from inclement weather and to automatically allow those units to operate at optimum temperature. The enclosure is comprised of a back, two sides and partial front and top walls with rigid insulation sandwiched between an outer and inner layer of material impervious to atmospheric conditions. The majority of the front and slanted top of the enclosure is comprised of two movable dual-glazed panels. Those movable panels are equipped with automatically operating interior light-reflecting horizontal slat blinds that change position in concert with the moveable dual-glazed panels that are operated by a non-electric temperature sensing operating device connected to the panels by a set of fulcrum advantaged rigid members activated as temperatures rise or fall within the enclosure.

Abstract: This invention provides a refrigeration system which includes in a closed loop connection a compressor for compressing a refrigerant into a condenser for condensing the compressed refrigerant into a liquid refrigerant, a control valve to controlling the discharge of the liquid refrigerant from the condenser into a reservoir, a sensor for measuring the temperature of the liquid refrigerant near the control valve, a fan for circulating air thorough the condenser, a sensor for measuring the ambient temperature of the air flow through the condenser, and an electronic control system to control various functions of the refrigeration system, including the flow of the liquid refrigerant through the condenser as function of the temperature difference between the ambient temperature and the temperature of the liquid refrigerant. During operation, a minimal flooding of the condenser is always maintained; i.e.

Abstract: A method for preventing an evaporator of an air conditioner from freezing comprises the steps of (1) detecting an outdoor temperature, (2) determining whether or not the outdoor temperature is 20.degree. C., (3) determining whether or not the outdoor temperature is in a first temperature range, (4) determining whether or not the outdoor temperature is in a second temperature range, (5) varying an R.P.M. of the motor assembly based on the outdoor temperature detected in steps (3) and (4), (6) detecting a surface temperature of a condenser and determining whether or not the surface temperature of the condenser is in a third temperature range, (7) repeating steps (1) through (6) if the surface temperature of the condenser is higher than the third temperature range, and (8) rotating the motor assembly at a low speed if the surface temperature of the condensor is lower than the third temperature range.

Abstract: In a refrigerating cycle (air conditioner) using mixture refrigerant, a mixing ratio of the refrigerant in a refrigerant circuit is measured by a mixing ratio detector, and a controller receives the detection signal to open a control valve when the mixing ratio of a high boiling-point refrigerant component is low, whereby the high boiling-point refrigerant stocked in a liquid reservoir is returned to the refrigerant circuit. The high boiling-point refrigerant which is supplied from the liquid reservoir through the opening operation of the control valve is supplied from a low pressure side of a compressor into the refrigerant circuit to keep the mixing ratio of the refrigerant circulating in the refrigerant circuit to a predetermined value, thereby preventing abnormal increase of pressure of the refrigerant due to variation of the mixing ratio.

Abstract: A cooling module for an automotive vehicle is disclosed. The module includes a pair of bypass doors for directing a flow of air around either of the condenser or radiator in the module depending upon the demands for engine cooling, air conditioning, and any other cooling requirements. Under suitable conditions, the radiator bypass feature or the condenser bypass feature will open, providing additional cooling for the condenser or radiator respectively, in order to satisfy given cooling requirements more efficiently.