超臨界 CO₂の太陽熱回収システムにおける熱流動とエネルギー輸送に関する研究

抄録

Natural circulation of supercritical and liquid two-phase CO₂ was investigated. The experimental solar water heater is installed at 30 ° and 90 ° of tilt angle. In the present study basic characteristic of energy transfer are focused on thermo-fluid behavior due to gravity force in two conditions of collector tilt angle (30 ° and 90 °). From the experimental results, it is found that the mass flow rate of CO₂ is increased, when the collector tilt angle is at 30 °, because of a large difference in density and the collector head. In addition heat transfer characteristics were increased with the increase of the Reynolds number and the Prandtl number.