Yinfeng Wang

Thermal Performance of a Single-Pass All-Glass Parabolic Trough Receiver

AbstractA novel single-pass all-glass parabolic trough receiver (SPAG-PTR) was developed and the parabolic trough solar collector with concentration ratio of 7.5 was built to investigate the thermal performance of the SPAG-PTR. The indoor heat loss tests were settled as well as the outdoor experiments in quasi-steady-state and transient-state test conditions. The heat loss per unit absorber area of the SPAG-PTR in the average absorber temperature from 100 to 287°C was within the range of 85–674  W/m2, which represents a better heat loss performance (−15%) upon the Sanle-3 receiver (Nanjing Sanle Electronic Information Industry Group, Nanjing, China). The experimental efficiency in transient state was within the range of 0.53–0.73 with the experimental relative error of approximately 3.6–6.5%. In addition, the experimental efficiency curve in quasi-steady-state was obtained. In quasi-steady-state, the experimental efficiency was approximately 0.65–0.71 when the inlet heat transfer fluid temperature was in ...

An initial investigation of the thermal-fluid characterization of a visualized loop thermosyphon

A initial investigation on the thermal-fluid performance of the visualized glass-water loop thermosyphon (LTS) with an U-turn compensation tube is reported in this article. The U-turn compensation tube may contribute to the unidirectional flow of the working fluid in the LTS. The results show that the favorable working fluid filling ratio is within the range of 43% to 70%. Fast startup of 10~40 s and thermal resistance of 0.625~0.7 °C/W of the LTS at the favorable filling ratio is achieved. The bulk boiling position in the evaporator moves away from the inlet of the evaporator with the increase of the filling ratio. When the value of charge ratio is up to 83%, the oscillation of the working fluid occurs in the loop cycle. The inclination angle within the range of 0~50° has a slight impact on the thermal performance of the LTS.