Thermal analysis of solar updraft tower by using different absorbers with convergent chimney

摘要

An experimental analysis of the solar updraft tower (SUT) with convergent chimney was undertaken by using different absorbers. Four different types of absorber materials were used in the experiment to store the solar intensity and exchanging it to the air being heated. The SUT comprised the three basic parts named as the solar collector, the tower or chimney and the turbine. An analysis for the solar updraft tower has been carried out, which describes the performance of solar updraft tower based on energy and exergy analysis. The maximum temperature distinction between ambient air and collector outflow was obtained in the case of SUT with small stone pieces (16.4 degrees C). The maximum average collector efficiency, collector exergy efficiency and overall efficiency of the SUT were acquired with the small stone pieces. The benefit of SUT system is that it would be favorable in the region with magnificent sunbeams to satisfy the demand of electricity.