| 摘要 |
PURPOSE: To prevent excessive icing and the breakdown of an ice making heat exchanger which are consequent upon a repeated operation of making and melting ice, by providing a function of reversing the supply side and the takeout side of cold water of a cold water header at an arbitrary time cycle, in a system wherein the heat of melting of ice is used as a demanded cooling energy in the daytime. CONSTITUTION: At the time of an ice making operation of ice heat storage equipment 1, a brine circulation selector valve 7 is switched so that a brine may circulate between a refrigerating machine 1a and an ice making heat exchanger 3 and ice is made on the surface of a heat transfer tube of the ice making heat exchanger 3. At the time of an ice melting operation, on the other hand, the brine circulation selector valve 7 is switched so that the brine may flow to a brine/water heat exchanger 5 and cold water is made to flow to a cold water outlet temperature regulating valve 9a and cold water headers 4a and 4c in a heat storage tank 2 in a branching manner in the meantime. After a prescribed number of times of the operations of making and melting ice, cold water circulation selector valves 8a and 8c are switched so that a direction of flow of the cold water in the heat storage tank 2 may be reversed. Thereby the melting of ice is made to start from a region wherein the amount of icing is large and the breakdown of the ice making heat exchanger 3 due to excessive icing is prevented in this way. |
