Investigation of evacuated tube heated by solar trough concentrating system
Investigation of evacuated tube heated by solar trough concentrating system
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DOI：
10.1016/j.enconman.2006.03.003
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发表时间：
2006-12
影响因子：
10.4
通讯作者：
M. Li;L. L. Wang-L.
中科院分区：
文献类型：
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作者：
M. Li;L. L. Wang-L.
利用抛物面槽式聚光器分别测量了两种太阳能真空管对水和氮气的加热效率和温度。实验结果表明，两种真空管均能以水为工质进行良好的传热，加热效率为70- 80%，且当液速小于0.0046kg/s时，水容易沸腾。然而，当N2气体温度达到320-460°C时，真空管太阳能聚光系统加热N2气体的效率低于40%。建立了槽式太阳能集热系统加热真空管的数学模型，以进一步分析真空管中流体的流动特性。结果表明，该模型与实验符合5.2%的精度。分析了太阳能集热系统加热真空管中流体在太阳辐射和槽形开口面积变化情况下的特性。本研究支持利用太阳能槽式聚光系统进行氨热化学储能24小时发电的研究工作。目前的研究工作也适用于太阳能制冷。
Two types of solar evacuated tube have been used to measure their heating efficiency and temperature with fluids of water and N2respectively with a parabolic trough concentrator. Experiments demonstrate that both evacuated tubes present a good heat transfer with the fluid of water, the heating efficiency is about 70–80%, and the water is easy to boil when liquid rate is less than 0.0046kg/s. However, the efficiency of solar concentrating system with evacuated tube for heating N2gas is less than 40% when the temperature of N2gas reaches 320–460°C. A model for evacuated tube heated by solar trough concentrating system has been built in order to further analyze the characteristics of fluid which flow evacuated tube. It is found that the model agrees with the experiments to within 5.2% accuracy. The characteristics of fluid via evacuated tube heated by solar concentrated system are analyzed under the varying conditions of solar radiation and trough aperture area. This study supports research work on using a solar trough concentrating system to perform ammonia thermo-chemical energy storage for 24h power generation. The current research work also has application to solar refrigeration.