An experimental study on evacuated tube solar collector using supercritical CO(2)

作者：Zhang X R^*; Yamaguchi H

来源：Applied Thermal Engineering, 2008, 28(10): 1225-1233.

DOI：10.1016/j.applthermaleng.2007.07.013

• solar collector
• supercritical CO(2)
• solar energy
• solar thermal utilization

A solar collector using supercritical CO(2) as working fluid is proposed in this paper. In order to investigate and estimate the CO(2)-based solar collector, an experimental set-up was constructed. Of particular interest of this paper are the basic collector characteristics, such as CO(2) temperature and pressure in the collector, CO(2) flow rate, and collector performances. The collector has been tested under various weather conditions. The results show that the CO(2) temperature, CO(2) pressure and mass flow rate increase with the solar radiation, which is different from those of traditional solar collector using liquid as working fluid. The solar radiation has influence on the CO(2) states, being liquid, liquid-gas or supercritical state in the test, furthermore, affects the CO(2) mass flow rate. The annually-averaged collector efficiency is found to be above 60.0% in the case of supercritical CO(2) as working fluid, which is much higher than that of water-based solar collector. This study shows the potential of the supercritical CO(2)-based solar collector in the field of solar thermal utilization.

• 出版日期2008-7
• 单位北京大学