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Document Details
Document Type
:
Article In Journal
Document Title
:
Effect of selective coating on thermal performance of flat plate solar air heaters
Effect of selective coating on thermal performance of flat plate solar air heaters
Subject
:
Physics
Document Language
:
English
Abstract
:
A transient mathematical model was presented for a single pass flat plate solar air heater. This model was based on an analytical solution of the energy balance equations for various elements of the heater. The flowing air temperature was assumed to vary only in the flow direction. The thermal performance of the heater was investigated by computer simulation using the climatic conditions of Jeddah (lat. 21° 42′ N, long. 39° 11′ E), Saudi Arabia. Effects of solar radiation intensity, mass flow rate of the flowing air (over(m, ̇)f) and the length (L) and width (b) of the absorber plat on the flowing air outlet temperature (Tfo) and the heater instantaneous (ηinst) and daily (ηd) efficiencies were studied. To improve the heater performance, effect of using absorber plates coated with various selective coating materials on the heater performance was also investigated. The best performance was achieved using nickel-tin as a selective coating material with a daily average of the instantaneous efficiency of 0.46. To validate the proposed mathematical model, the simulated results were compared with the measurements that had been performed for the heater with a black painted absorber plate under Tanta, lat. 30° 47′ N (Egypt), weather conditions. It was found that the proposed model is able to predict the Tfo accurately with a daily average relative percentage error of 7.7%. It was also inferred that the annual average of ηd with a nickel-tin selectively coated absorber is higher than that with a black painted absorber by 29.23%.
ISSN
:
03605442
Journal Name
:
Energy
Volume
:
35
Issue Number
:
4
Publishing Year
:
1431 AH
2010 AD
Article Type
:
Article
Added Date
:
Saturday, April 10, 2010
Researchers
Researcher Name (Arabic)
Researcher Name (English)
Researcher Type
Dr Grade
Email
أحمد عبد العظيم السباعي
El-Sebaii, A A
Researcher
Doctorate
aasebaii@yahoo.com
هند عتيق السناني
Al-Snani, Hend Ateq
Researcher
Master
Files
File Name
Type
Description
26366.pdf
pdf
Abstract
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