| 摘要 |
PURPOSE:To ensure a stable operation by a method wherein when frost is removed during the heating operation, an amount of attached frost or a freezing cycle temperature and a pressure are detected, and if the temperature of a heat accumulator is below a predetermined value, the heat accumulator is heated by means of an auxiliary heat source. CONSTITUTION:A heat accumulating tank 11 is used as an evaporator with electromagnetic valves 4 and 15 being open and electromagnetic valves 7, 9 and 12 being closed. At this time, the temperaure of the heat accumulator 11a in the heat accumulating tank 11 or the temperature and pressure in the freezing cycle is detected out. On the other hand, it is determined how much heat is required for heating a room and defreezing. If a sufficient amount of heat cannot be obtained, an auxiliary heat source 11b is operated preliminarily from a certain time period before the starting of the freezing operation, so that a sufficient amount of heat is accumulated in the heat accumulator 11a. Accordingly, the heat for room heating and the heat for defreezing are both procured sufficiently thereby performing a stable operation constantly. |
