Patent ID: 6807815
Filing Date: 2004-10-26
Classification: F25B

Abstract:
An air conditioning system comprising:an air conditioner for establishing a cooling cycle adapted to sequentially perform compression, condensation, expansion and evaporation functions, and eliminating a cooling load in a room by the cooling cycle, thereby conditioning the atmosphere of the room; a control unit for controlling an operation state of a compressor unit adapted to perform the compression function, in order to vary a refrigerant compression capacity of the compressor unit in accordance with the cooling load, wherein the air conditioner comprises: the compressor unit including a plurality of compressors each adapted to compress a low-temperature and low-pressure gaseous refrigerant, thereby changing the refrigerant into a high-temperature and high-pressure state; a condenser adapted to condense the high-temperature and high-pressure gaseous refrigerant, thereby changing the refrigerant into a medium-temperature and high-pressure liquid refrigerant; an expansion valve adapted to reduce the pressure of the medium-temperature and high-pressure liquid refrigerant emerging from the condenser, thereby changing the liquid refrigerant into a low-temperature and low-pressure liquid refrigerant; and an evaporator adapted to evaporate the low-temperature and low-pressure liquid refrigerant emerging from the expansion valve, thereby changing the liquid refrigerant into a low-temperature and low-pressure gaseous refrigerant; and wherein the control unit comprises: a counting unit senses that a point of time when the compressor unit is stopped, and counts a waiting time taken until the stopped compressor unit is re-operated; a temperature sensing unit that senses a temperature of the room after the waiting time counted by the counting unit; a load determining unit that determines a cooling load generated during the waiting time, based on a temperature difference between the room temperature sensed by the temperature sensing unit and a previously-input desired temperature; and a compressor controlling unit that outputs a control signal making the compressor unit operate in a full operation mode or a selective operation mode in accordance with the cooling load sensed by the load determining unit.