Efficiency improvement of a concentrated solar receiver for water heating system using porous medium

8th TSME-International Conference on Mechanical Engineering

Prasartkaew, Boonrit^1

Combustion and Solar Energy Laboratory (CASE Lab.), Faculty of Engineering, Rajamangala University of Technology Thanyaburi, Klong 6, Thanyaburi, Patumthani

12110, Thailand^1

关键词: Comparative studies;    Concentrated solar;    Efficiency improvement;    Heat transfer mechanism;    Solar water heating systems;    System efficiency;    Thermal efficiency;    Water heating systems;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/297/1/012059/pdf
DOI  :  10.1088/1757-899X/297/1/012059

来源: IOP

【 摘 要 】

This experimental study aims at investigating on the performance of a high temperature solar water heating system. To approach the high temperature, a porous-medium concentrated solar collector equipped with a focused solar heliostat were proposed. The proposed system comprised of two parts: a 0.7x0.7-m2porous medium receiver, was installed on a 3-m tower, and a focused multi-flat-mirror solar heliostat with 25-m2aperture area. The porous medium used in this study was the metal swarf or metal waste from lathing process. To know how the system efficiency could be improved by using such porous medium, the proposed system with- and without-porous medium were tested and the comparative study was performed. The experimental results show that, using porous medium for enhancing the heat transfer mechanism, the system thermal efficiency was increased about 25%. It can be concluded that the efficiency of the proposed system can be substantially improved by using the porous medium.