AN EXPERIMENTAL STUDY ON THE HEAT TRANSFER CHARACTERISTICS OF THE HYBRID SOLAR RECEIVER FOR A DISH CONCENTRATING SYSTEM
The dish/stirling system is used to convert solar energy directly to electricity. Therefore, in order to improve economical efficiency of a solar power system, the stirling unit must be operated continuously. For continuous operation of the stirling unit, the receiver must be continuously provided with thermal energy from solar as well as additional combustion heat. It is possible for a hybrid solar receiver system equipped with an additional combustion system to be operated 24 hrs/day. A hybrid solar receiver adopted heat pipe heat transfer mechanism was designed and manufactured to supply the thermal energy to the stirling engine. The hybrid receiver system was tested in a gas-only mode to investigate heat transfer characteristics at inclination angles varying from 0 deg to 30 deg and the ratios of the aperture diameter to cavity diameter of 0(closed cavity) and 1(open cavity). The increase in temperature in the case of a closed cavity is higher than an open cavity, but temperatures in all cases rise in proportion to the input thermal load. In the case of the open cavity, the thermal resistances decreased in proportion to input thermal load and inclination angle, but it was 1~3 times higher than those of the closed cavity. The evaporation and condensation heat transfer coefficient increased linearly with input thermal load. The evaporation heat transfer coefficient increased in proportion with input thermal load and inclination angle in the closed cavity.
MyeongCheol Kang JinSoo Kim YongHeack Kang NackJoo Kim SeongYeon Yoo JinHeack Kim
Korea Institute of Energy Research P.O.Box 305-343 Daejeon, Korea Seoul National University of Technology P.O.Box 139-743 Seoul, Korea BK21 Mechatronics Group at Chungnam National University P.O.Box 305-764 Daejeon, Korea
国际会议
2007世界太阳能大会(Proceedings of ISES Solar World Congress 2007)
北京
英文
2007-09-18（万方平台首次上网日期，不代表论文的发表时间）