Analytical and Experimental Studies on the Thermal Efficiency of the Double-Pass Solar Air Collector with Finned Absorber | Science Publications

American Journal of Applied Sciences

Ahmad Fudholi¹  Kamaruzzaman Sopian¹  Mohd H. Ruslan¹  Mohd. Y. Othman¹  Muhammad Yahya¹ 

关键词: Double-pass solar air collector;    finned absorber;    thermal efficiency;   

DOI  :  10.3844/ajassp.2011.716.723

学科分类：自然科学（综合）

来源: Science Publications

【 摘 要 】

Problem statement: The design of suitable air collectors is one of the most importantfactors controlling the economics of the solar drying. Air type collectors have two inherentdisadvantages: Low thermal capacity of air and low absorber to air heat transfer coefficient.Different modifications are suggested and applied to improve the heat transfer coefficient betweenthe absorber plate and air. These modifications include the use of extended heat transfer area,such as finned absorber. Approach: The efficiency of the solar collector has been examined bychanging the solar radiation and the mass flow rate. An analytical and experimental study toinvestigate the effect of mass flow rate and solar radiation on thermal efficiency were conducted.The theoretical solution procedure of the energy equations uses a matrix inversion method andmaking some algebraic rearrangements. Results: The average error on calculating thermalefficiency was about 7%. The optimum efficiency, about 70% lies between the mass flow rates0.07-0.08 kg sec^-1. The thermal efficiencies increase with flow rate and it increase about 30% atmass flow rate of 0.04-0.08 kg sec^-1. Conclusion: The efficiency is increased proportional tomass flow rate and solar radiation and .the efficiency of the collector is strongly dependent on theflow rate.

【 授权许可】

Unknown