HEAT STORAGE AIR CONDITIONER

PROBLEM TO BE SOLVED: To utilize stored cold in proper quantities by determining a cooling operation mode of lowest power consumption where consumption of stored cold is lower than the quantity of stored cold at the time of utilizing stored cold based on a stored cold utilization time, the quantity of stored cold and consumption of stored cold. SOLUTION: Water level of a heat storage tank 9 detected by a water level sensor is inputted to a heat storage air conditioner controller 25 where displacement of water level is calculated and the quantity of cold stored in the heat storage tank 9 is operated and set. Subsequently, the controller 25 selects an operation mode where consumption of stored cold is lower than the quantity of stored cold at the time of utilizing stored cold from the relation of the quantity of stored cold, consumption of stored cold for cold radiation cooling operation time, combined cooling operation time and supercooling operation time, and utilization time of stored cold, e.g. 10 hours, received from a schedule timer 27. An operation mode of lowest power consumption is then determined among the selected operation modes.