Heat source system controlling device, heat source system, heat source system controlling method, and heat source system controlling program

Abstract

A superordinate controlling device for a heat source system () including a plurality of heat sources, the superordinate controlling device being applied to the heat source system () and controlling heat-pump type chillers () and () and absorption-type chillers () and () in such a manner that a heat transfer medium leaving temperature that is the temperature of a heat transfer medium supplied to an external load () is equal to a setting temperature. The heat-pump type chillers () and () each have a higher Coefficient of Performance (COP) than that of each of the absorption-type chillers () and (). The superordinate controlling device includes a heat transfer medium leaving temperature changing means for carrying out heat transfer medium leaving temperature control, by changing the heat transfer medium leaving temperatures of the heat-pump type chillers () and (), when a post-change prediction value of each of the absorption-type chiller () and () predicted based on a supposition that the heat transfer medium leaving temperatures of the heat-pump type chillers () and () are changed exceeds a second underload stop threshold value at which the corresponding one of the absorption-type chiller () and () would have an underload stop.