Patent ID: 6874326
Filing Date: 2005-04-05
Classification: F25B,Y02B,Y10S

Abstract:
1. An air conditioning system with two compressors, comprising: an air conditioner that conditions air of a room via a cooling cycle formed by a refrigerant passing through compressors, a condenser, an expansion valve, and an evaporator; and a control unit that determines a compression capacity of the refrigerant according to cooling load, and controls operating states of the compressors so that a peak value of a current required to compress the refrigerant of the compressors is limited, wherein the air conditioner comprises: a first compressor and a second compressor, wherein the first compressor has a refrigerant compression capacity larger than a refrigerant compression capacity of the second compressor, and the first compressor and second compressor compress a gaseous refrigerant in a low-temperature and low-pressure state so as to convert the gaseous refrigerant into a high-temperature and high-pressure state; a condenser that condenses the gaseous refrigerant in the high-temperature and high-pressure state so as to convert the gaseous refrigerant into a liquid refrigerant in a mid-temperature and high-pressure state; an expansion valve that expands the liquid refrigerant in the mid-temperature and high-pressure state so as to convert the liquid refrigerant into a low-temperature and low-pressure state; and an evaporator that evaporates the liquid refrigerant in the low-temperature and low-pressure state so as to convert the liquid refrigerant into a gaseous refrigerant in a low-temperature and low-pressure state, and wherein the control unit comprises: a sensing unit that senses whether or not the cooling load is increased; a compressor-control unit that outputs a full operation control order for operating the compressors, when the sensing unit senses the increased cooling load; a timer unit that measures a designated time from an output of the full operation control order from the compressor-control unit; and a compressor-driving unit that sequentially operates the first and second compressors, when the full operation control order is output from the compressor-control unit, and wherein the compressor-driving unit first operates the first compressor having a refrigerant compression capacity larger than the refrigerant compression capacity of the second compressor, and after a lapse of the designated time, the compressor-driving unit additionally operates the second compressor having the refrigerant compression capacity smaller than the refrigerant compression capacity of the first compressor.