| 摘要 |
PURPOSE:To improve a heat transfer coefficient and uniform heat transfer by filling liquid refrigerant in the shell of an evaporator in a sufficient amount of covering a tube in the shell while a refrigerant circulating cycle is formed in a heat pump and operating. CONSTITUTION:A shell side cooling vessel 18 is operated as a function of an evaporator of a heat pump apparatus, and formed as a full-liquid type evaporator. That is, liquid refrigerant 21 is filled in the vessel 18 in a sufficient amount of immersing a heat transfer tube 17, i.e., its liquid level 22 is disposed above the tube 17 in the vessel during the operation of the apparatus, the upper space of the level 22 is maintained under negative pressure, and the tube 17 is heated by the refrigerant 21 to boil the liquid. Thus, when overcooled water is produced to manufacture sherbetlike ice to reserve ice cold for air conditioning, an overcooler 2 of its central device is formed in a boiling heat transfer type full-liquid evaporator, thereby improving a heat transfer coefficient and performing uniform heat transfer in the entire heat transfer tube. |
