PURPOSE: To improve heat exchange between a coolant and hot feed water, by a method wherein, on a condensing pipe, through which a condensed coolant flows, and a water heating pipe, through which hot feed water flows, thermal conduction is made through the medium of a heat transfer fin.
CONSTITUTION: A condensing pipe 10 and a water heating pipe 11 are inserted into a number of thermal conductive fins 12 for expansion, and thereafter, the condensing pipe 10 and the water heating pipe 11 are bend-welded to the thermal conductive fins 12. A high-temprature high-pressure coolant gas radiates the heat to feed hot water, flowing through the water heating pipe 11, through the thermal conductive fins 12 by means of the condensing pipe 10 for condensation and liquefaction, and the coolant gas, reduced in a pressure by an expansion valve 4, is brought to a low-temperature and low-pressure condition and flows in a collector 1 for evaporation. In which case, the coolant is gasified by the solar heat or through absorption of the heat from the atmospheric heat, and the gasified coolant flows in a compressor 2 again for compression. Thus, even if the condensing pipe through which the condensed coolant flows happens to be broken, the coolant is prevented from mixture with hot feed water and excellent heat exchange is also conducted.
WATANABE TAKEJI
OUTAKE TATSUNORI
