@article {10.3844/ajassp.2011.254.260, article_type = {journal}, title = {Thermal Efficiency of Double Pass Solar Collector with Longitudinal Fins Absorbers}, author = {Fudholi, Ahmad and Sopian, Kamaruzzaman and Ruslan, Mohd Hafidz and Othman, Mohd. Yusof and Yahya, Muhammad}, volume = {8}, year = {2011}, month = {Mar}, pages = {254-260}, doi = {10.3844/ajassp.2011.254.260}, url = {https://thescipub.com/abstract/ajassp.2011.254.260}, abstract = {Problem statement: One of the most important components of a solar energy system is the solar collector. The performances of double-pass solar collector with longitudinal fins absorbers are analyzed. Approach: The study involves a theoretical study to investigate the effect of mass flow rate, number and height of fins on efficiency, which involves steady-state energy balance equations on the longitudinal fins absorber of solar collectors. The theoretical solution procedure of the energy equations uses a matrix inversion method and making some algebraic rearrangements. Results: The collector efficiency increases as the number and height of fins increases. For a mass flow rate 0.02- 0.1kg/s, the double-pass solar collectors are efficiency about 36-73% in upper fins (type I), 37-75% in lower fins (type II) and 46-74% in upper and lower fins (type III). Conclusion: The efficiency of the collector is strongly dependent on the flow rate, efficiency increase is about 35%.}, journal = {American Journal of Applied Sciences}, publisher = {Science Publications} }