| 摘要 |
PURPOSE:To collect heat always at the maximum energy efficiency in a plant which generates power by use of sun heat or waste heat of a plant by integrating a plurality of heat accumulation tanks which differs in temperature of accumulated heat, in a heat collection loop and by selecting an appropriate one from those tanks according to condition of a heat source or so. CONSTITUTION:A heat collection loop is made up of a heat collector 1, three-way valves 11a and 11b, a steam generator 5, a heat accumulation tank unit 3, a heat medium circulation pump 4 and a bypass flow passage 40 which are properly connected to each other. The heat accumulation tank unit 3 consists of low and high temperature heat accumulation tanks 3a and 3b which differ in temperature of accumulated heat. A Rankine cycle 2 is formed by piping the steam generator 5, an expansion mechanism 6, a condenser 7 and a pump 8a. An optimum value of a temperature of heat medium at the inlet of the heat collector, determined according to temperature of open air and intense of solar radiation is shown by T0 and temperatures of heat accumulation tanks 3a and 3b are shown by T1 and T2. The three-way valves 12a and 12b are placed under change-over control as to select the low temperature heat accumulation tank 3a for T2>T0>T1 and select the high temperature heat accumulation tank 3b for T0>T2. |
