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6178760 |
Electric vehicle air conditioner system and method for effecting defrosting operation before battery charging operation
An air conditioner system for vehicles has an exterior heat exchanger, which is used as an evaporator at the time of heating operation. A control unit monitors the heating operation and stores a...
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6161393 |
Control system for mobile air conditioning apparatus
A control system for mobile air conditioning systems for controlling the rate at which the system compressor or clutch is cycled between operational and decreased refrigerant flow, by selectively...
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6141978 |
Method and apparatus for eliminating unnecessary defrost cycles in heat pump systems
An improved method and apparatus for limiting the pressure in the high pressure side of a heat pump system to a safe value, without causing the defrost control circuitry thereof to initiate...
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6131400 |
Operation control method for a refrigerator in case of a power-supply comeback after a power-failure
An operation control method for a refrigerator after a power-supply comeback due to a power-failure that performs a re-operation according to operation information stored before the power-failure....
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6112534 |
Refrigeration and heating cycle system and method
An Improved Refrigeration System and Heating/Defrost Cycle is disclosed. The system, for heating circulating air and defrosting an enclosed area, includes a refrigerant, an evaporator using said...
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6092925 |
Frost formation detector
A frost deposition detecting device is provided. This frost deposition detecting device comprises: a base member 1; a heat-conductive container 4 including a frosting portion provided to the base...
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6089033 |
High-speed evaporator defrost system
A high-speed evaporator defrost system is comprised of a defrost conduit circuit connected to the discharge line of one or more compressors and back to the suction header through an auxiliary...
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6073690 |
Heating system control unit
A heating system control unit is provided for use with a heating system. The control unit includes a switching element connected to a first temperature switch associated with a first stage heater,...
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6058722 |
Air curtain fan driving device and method for a refrigerator
A reference temperature of the cooler is set which is required to moderate an interior temperature of the refrigerator. During a defrosting mode, if a door is opened, then a control part switches...
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6058724 |
Refrigerator defrost controlling method
A refrigerator defrost controlling method includes the step of setting an initial defrost cycle, the step of determining whether defrost entering conditions are met, the step of driving a defrost...
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6058723 |
Controller of refrigerator
There is provided a refrigerator capable of suppressing intra-compartment temperature from rising during a defrosting operation by means of a defrosting heater and capable of preventing temperature...
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6055819 |
Apparatus and method for preventing an evaporating for an air conditioning system form freezing
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°...
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6038872 |
Frost detecting device
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6032471 |
Defrost control method for use in a refrigerator
The invention provides a method of defrosting a frost load accumulated on an evaporator, the method comprising the steps of: performing a normal mode for controlling ON-OFF operations of the...
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6021644 |
Frosting heat-pump dehumidifier with improved defrost
A reverse cycle refrigeration apparatus for air dehumidification is employed having an evaporator and a condenser and employing first and a second heat transfer coils for this purpose. Both coils...
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6012294 |
Air conditioner control method and apparatus of the same
In a heat pump type air conditioner, a refrigerant ejection port of a compressor in a refrigerating cycle thereof is connected to a refrigerant inflow port of an outdoor heat exchanger via a bypass...
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5992163 |
Process and arrangement for an air conditioner control with an evaporator protected against icing
A process and an arrangement for controlling an air conditioner utilize an evaporator protected against icing and a refrigerant circulating system which includes at least one compressor and the...
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5970727 |
Refrigerating cycle apparatus
A refrigerating cycle apparatus including an inverter driven compressor with controllable speed of rotation, a four-way valve, an indoor heat exchanger, a pressure reducing device, outdoor heat...
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5931009 |
Defrosting apparatus of air conditioner and method thereof
A defrosting apparatus of an air conditioner and method thereof are provided to efficiently carry out a defrosting operation during the heating operation by comparing temperature of an outdoor...
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5927083 |
Compressor cycle dependent defrost control
A defrost control for a heat exchange system initiates a defrost of the evaporator coil when a predetermined count of compressor cycles occurs and other sensed conditions indicate that defrost...
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5924298 |
Control method of defrosting operation of a refrigerator
A refrigerator includes a defrosting heater. An outdoor air temperature sensor senses a temperature of outside air. A defrosting time period of the heater is set as a function of the outside air...
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5921092 |
Fluid defrost system and method for secondary refrigeration systems
A fluid defrost system and method for defrosting the cooling coil of a product fixture normally cooled by circulating a cold secondary liquid coolant in a cooling loop refrigerated by a primary...
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5904047 |
Air conditioner control apparatus and method therefor
This invention provides an air conditioner for simultaneously cooling or heating a plurality of rooms by using a single outdoor unit and at least two and more indoor units connected to the outdoor...
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5887443 |
Defrost control method and apparatus of refrigerator
A defrost control method and apparatus for a refrigerator having a defrosting heater for defrosting the evaporator. The method classifies a plurality of operating condition cases based on outside...
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5878583 |
Ice making machine and control method therefore
An ice making machine comprises a refrigerant system having a compressor, a condenser, an expansion device, an evaporator and interconnecting refrigerant lines; a water system having a fresh water...
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5870899 |
Method for controlling a pausing period of a defrosting operation of a refrigerator
Disclosed is a controlling method for minimizing a temperature deviation in a refrigerator by optimally varying a pausing period of a defrosting operation based on a present temperature in the...
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5845502 |
Heat pump having improved defrost system
A heat pump system includes, in an operable relationship for transferring heat between an exterior atmosphere and an interior atmosphere via a fluid refrigerant: a compressor; an interior heat...
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5842355 |
Defrost control system for a refrigerator
A refrigeration controller is provided which thermostatically controls a refrigerated compartment temperature. A heated evaporator is provided within a certain wattage range to accelerate...
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5816054 |
Defrosting apparatus for refrigerators and method for controlling the same
A defrosting apparatus for a refrigerator and a method for controlling the defrosting apparatus, wherein the refrigerating compartment is cooled irrespective of the internal temperature of the...
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5809789 |
Refrigeration module
A refrigeration module removably suitable for use in either a refrigerator or a freezer uses signals from a series of temperature sensors for refrigeration control. An automatic defrost cycle is...
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5797273 |
Control of defrost in heat pump
A defrost control for a heat pump system initiates a defrost of the outdoor coil when certain computed condition occur. The conditions include exceeding a limit as to the difference that may be...
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5775116 |
Defrosting control method for air conditioner
A defrosting control method wherein an indoor unit determines whether a drop in the temperature gradient of an indoor side heat exchanger has been caused by a heavy load protecting operation or...
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5765382 |
Adaptive defrost system
An adaptive defrost control for a refrigerator is shown in which a single linear power supply (12) and microprocessor (U1) is used for both the adaptive defrost and cold control functions....
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5758507 |
Heat pump defrost control
The present invention relates to a method for alleviating a short-term "cold blow" effect in a heat pump heating system. According to a method of the invention, reversing of a system valve in...
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5727393 |
Multi-stage cooling system for commerical refrigeration
A non-compressible coolant fluid system for cooling product merchandisers having heat transfer means constructed and arranged for maintaining preselected product zone temperatures, comprising an...
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5727395 |
Defrost control for heat pump
A defrost control for a heat pump system initiates a defrost when certain computed conditions are exceeded. The conditions include a limit as to the difference that may be permitted between the...
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5709096 |
Defrosting device for a low temperature display case
The object of the present invention is to provide a defrosting device, for a low temperature display case, that can effectively prevent incomplete defrosting, and that can reduce the temperature...
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5694782 |
Reverse flow defrost apparatus and method
The present invention provides a closed loop vapor cycle refrigeration system that includes a compressor, a condenser, an evaporator system having at least two parallel evaporator coils, means for...
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5689964 |
Operation control device for air conditioner
When a defrosting requiring signal is outputted, the opening of a motor-operated expansion valve (5) is fully closed in a heating cycle so that refrigerant is recovered into a receiver (4). In...
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5673565 |
Defrosting method and apparatus for freezer-refrigerator using GA-fuzzy theory
There are described a defrosting method and apparatus for a freezer-refrigerator using a GA-fuzzy theory. A defrosting method for a freezer-refrigerator using a GA-fuzzy theory of the present...
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5669222 |
Refrigeration passive defrost system
A refrigeration system includes a compressor, a condenser, an expansion throttle, an evaporator and a control valve. All of the above elements are connected in series, in that order, in a...
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5666816 |
Defrosting method and apparatus for refrigerator using GA-fuzzy theory
There are described a defrosting method and apparatus of a refrigerator using a GA-fuzzy theory. The defrosting method comprises the steps of: inputting reference learning data by experiment and...
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5587642 |
Fan motor brown-out control algorithm
An air conditioner having a fan motor brown-out control algorithm for increasing the air conditioner fan speed upon sensing a brown-out under-voltage condition is provided. The air conditioner has...
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5586448 |
Defrosting control system for use in an air-conditioner in an electric vehicle
An external heat exchanger of a heat pump air-conditioner on an electric vehicle is determined as being frosted based on signals from temperature sensors. If the external heat exchanger is frosted,...
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5575158 |
Refrigeration defrost cycles
A hot gas defrost system for a refrigeration cycle, including at least one compressor, condenser, receiver, expansion valve and evaporator. During defrost, a pressure-sensitive valve to the...
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5564286 |
Refrigerator defrost control apparatus and method
A defrost control apparatus and method for controlling the defrosting of a cooling coil of a refrigerator by estimating a postpone defrost time to postpone the defrosting of the cooling coil in...
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5553462 |
Dehumidifiers
Air drawn in by a fan 4 is cooled by evaporator coils 2 and re-warmed by a condenser 3. A microcontroller MC and sensor S reads the temperature of the incoming air at regular intervals, e.g. once...
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5544493 |
Air-conditioning device for electric automobiles
The invention prevents the temperature of supplied air from being decreased by a defrosting operation when a vehicle is in operation. During the heating operation, it is judged whether the vehicle...
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5533350 |
Defrost control of a refrigeration system utilizing ambient air temperature determination
A method for determining the time to begin and end a defrosting cycle of an evaporator included within a refrigeration system. Decisions as to initiate and terminate defrosting operations are...
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5528908 |
Blocked fan detection system for heat pump
The blocked fan or obstructed airflow condition is detected by measuring the difference between outdoor air temperature and outdoor exchanger coil temperature. If a very high difference is...
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