蓄热介质对太阳能热风发电集热器性能的影响

分别以沙子、石子以及石子与充水黑色密封管的组合作为蓄热介质,搭建了太阳能集热器试验装置并进行了相应的试验研究,得出了不同蓄热介质的吸放热特性及其对集热器内空气进出口温差、集热器效率的影响规律.结果表明:在相同的平均辐射强度下,石子与充水黑色密封管组合集热器的蓄热性能好,且集热器空气进出口温差及集热器效率最大,为太阳能热风发电系统集热器地面蓄热材料的选用提供了依据.

Influence of Thermal Storage Materials on Thermal Performance of Heat Collector in Solar Chimney Power Generations

A test rig of solar heat collector was set up and corresponding tests were carried out taking sands,pebbles and combination of pebbles and water-filled black sealed tubes as thermal storage material(TSM),respectively.Heat absorption and release characteristics of different TSMs and their influence on temperature differences between air inlet and outlet of heat collector are obtained.Results indicate that the combination of pebbles and water-filled black sealed tubes shows a higher heat storage capacity under the same average radiation intensity.Temperature difference between air inlet and outlet of heat collector,as well as heat efficiency,of the combination of pebble and waterfilled black sealed tubes are the highest among the three TSM heat collectors.Results provide a foundation for the selection of heat collector in solar chimney power generation system.