| 摘要 |
PURPOSE:A bypass pipe attached with a changeover valve is arranged parallel to a pressure reducing mechanism which forms a closed circuit with a heat collector for evaporating a flon type coolant. CONSTITUTION:A closed circuit is formed by a heat collector 10, a medium transfer machine 6, a condenser 7 and a pressure reducing mechanism 9 and the bypass pipe 12 attached with the changeover valve 11 is connected parallel to the pressure reducing mechanism 9. With the above structure, when the amount of insolation is large, the flon type gas phase coolant having its pressure loss compensated through the transfer machine 6 is converted into a liquid phase coolant by the condenser 7 and is transferred to the heat collector 10 through the changeover valve 11 so as to become vaporized while when the amount of insolation is small, the gas phase coolant which has been heated to a high temperature at high pressure through the transfer machine is converted into the liquid phase coolant, the pressure of the liquid phase coolant is reduced by the pressure reducing mechanism 9 and flows into the heat collector 10 at a low saturated temperature. As a consequence, the temperature of the coolant does not change during its passage through the heat collector and the difference between the real temperature and the surface temperature of the coolant becomes constant so that the amount of heat collection is increased and the heat collector 10 can be miniaturized. |
