| 摘要 |
PROBLEM TO BE SOLVED: To provide a solar heat collecting means capable of saving energy by dispensing with power, reducing costs by simplifying a device constitution, and achieving high recovering temperature even in winter. SOLUTION: This heat collecting device comprising a solar-heat heating device provided with a closed circuit 1 for circulating working fluid mainly composed of CO<SB>2</SB>, and collecting heat in the working fluid, and a heat exchanger 3 recovering heat from the working fluid in which heat is collected, comprises the heat exchanger 3 for recovering heat retained by the working fluid w, liquefying the same, and forming a liquid head pressure H by the working fluid 2 at an outlet side by having the difference in heights between an inlet side where the working fluid w flows in and the outlet side where the working fluid w flows out, and the solar-heat heating device 2 disposed in the closed circuit 1, and collecting heat in the liquefied working fluid 2 to keep the working fluid w at the outlet side in a supercritical state, and natural circulation of the working fluid 2 is formed in the closed circuit 1. COPYRIGHT: (C)2009,JPO&INPIT
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