Patent ID: 6102114
Filing Date: 2000-08-15
Classification: F24F,F25B,Y02B

Abstract:
A multi-room air conditioning system comprising:an outdoor unit having a variable capacity compressor, a four-way valve, an outdoor heat exchanger, and a refrigerant heater;a plurality of indoor units each having an indoor heat exchanger and connected in parallel to said outdoor unit;a primary fluid line mounted in said outdoor unit to allow a liquid refrigerant to flow therethrough;a primary gas line mounted in said outdoor unit to allow a gas refrigerant to flow therethrough;a plurality of fluid distribution lines branched from said primary fluid line for connecting said outdoor unit with said plurality of indoor units;a plurality of gas distribution lines branched from said primary gas line for connecting said outdoor unit with said plurality of indoor units;a plurality of motor-driven expansion valves installed in said plurality of fluid distribution lines, respectively;a room temperature setting means for setting a desired temperature of a room in which each indoor unit is installed;a room temperature detecting means for detecting a room temperature;a differential temperature calculating means for calculating a differential temperature between the temperature set by said room temperature setting means and the room temperature detected by said room temperature detecting means;a rated capacity memory means for storing a rated capacity of each indoor unit;a compressor frequency and combustion control calculating means for calculating a compressor frequency and a target combustion level of said refrigerant heater at regular time intervals; andsaid compressor frequency and combustion control calculating means reading a first load level for each indoor unit from a first load coefficient table using the differential temperature calculated by said differential temperature calculating means and the rated capacity stored in said rated capacity memory means, said compressor frequency and combustion control calculating means multiplying a sum of the first load levels by a predetermined constant and adding a compensation value thereto to obtain a frequency value to thereby control said compressor, said compressor frequency and combustion control calculating means also setting the target combustion level using the frequency value to thereby control said refrigerant heater.