TY  - JOUR
VL  - 112
UR  - https://www.scopus.com/inward/record.uri?eid=2-s2.0-84920392597&doi=10.1016%2fj.solener.2014.11.031&partnerID=40&md5=83d47b80ed2db0b4241d960b0ea18d6d
A1  - Al-Kayiem, H.H.
A1  - Yassen, T.A.
JF  - Solar Energy
Y1  - 2015///
KW  - Air preheaters; Heat convection; Heating equipment; Natural convection; Solar absorbers; Solar collectors; Solar equipment; Solar heating
KW  -  Absorber plates; Experimental investigations; Flat plate; Inclination angles; Optimum angle; Rectangular conduit; Rectangular ducts; Solar air heater
KW  -  Heat transfer
KW  -  absorbance; adsorption; airflow; aluminum; experimental study; heat transfer; solar power; thermal convection
ID  - scholars6038
N2  - This paper presents and discusses the experimental measurements versus the results from the available correlations in the literature that are commonly used to predict the free convection heat transfer coefficient between the surfaces and the flowing air. The experimental investigations were accomplished using a rectangular duct comprising a flat plate-glass cover as the solar air heater with the following dimensions: 0.48-m width. �. 0.07-m depth. �. 2-m length. The absorber plate was made of 1-mm gauge of aluminium. The measurements were performed at inclination angles of 30°, 50°, and 70° to determine the optimum angle of the absorption-free convection mechanism in a solar air heater. The comparison is presented and discussed in terms of the Nusselt number. The optimum inclination angle to achieve the best collector performance was found to be 50°. The results of the present work can assist in resolving the issue of predicting the free convection in thermal passages. © 2014 Elsevier Ltd.
EP  - 318
SN  - 0038092X
PB  - Elsevier Ltd
SP  - 310
TI  - On the natural convection heat transfer in a rectangular passage solar air heater
N1  - cited By 40
AV  - none
ER  -