Abstract: The engine drives the generator, which generates electric power. The power drives the compressor. Thus driven, the compressor cools the interior of the refrigerating chamber. When the engine stops, the output of the generator stops is no longer available. Then, the compressor is automatically driven by the power of the storage battery unit.

Abstract: The engine drives the generator, which generates electric power. The power drives the compressor. Thus driven, the compressor cools the interior of the refrigerating chamber. When the engine stops, the output of the generator stops is no longer available. Then, the compressor is automatically driven by the power of the storage battery unit.

Abstract: The air-conditioning apparatus automatically selects one of three operational modes and operates at one of three operational zones defined by a combination of the temperature and the humidity to establish thermally comfortable conditions. In the cooling zone, the air conditioning apparatus operates to control the temperature to lower the temperature; in a dehumidifying zone it operates to control the humidity to lower the humidity; in a fan zone it operates to stir the air to maintain thermally comfortable conditions. The air conditioning apparatus includes an operational mode controller which senses the temperature and humidity and changes the operational mode based upon the sensed temperature and the sensed humidity.

Abstract: In a method for controlling an air conditioning system including a frequency-variable power source device for providing an AC electric power of a variable frequency, and a compressor driven by the AC electric power, the air conditioning power of the conditioning system being dependent on the frequency of the AC electric power, the temperature of the air to be conditioned is detected; and a frequency set value is determined in accordance with a deviation of the detected temperature with reference to a set temperature. For determining the frequency set value, a plurality of temperature deviation zones are defined; the frequency set value is changed when the deviation transits from one of the zones to another; and the frequency set value is also changed when the deviation continues to be within one of the zones of a relatively great deviation over a predetermined length of time.

Abstract: An air-conditioning apparatus automatically selects one of three operational modes and operates at one of three operational zones defined by a combination of the temperature and the humidity to establish thermally comfortable conditions. In the cooling zone, the air conditioning apparatus operates to control the temperature to lower the temperature; in a dehumidifying zone it operates to control the humidity to lower the humidity; in a fan zone it operates to stir the air to maintain thermally comfortable conditions. The air conditioning apparatus includes an operational mode controller which senses the temperature and humidity and changes the operational mode based upon the sensed temperature and the sensed humidity.