COMPARATIVE STUDY ON SOLAR ABSORPANCE OF SOME COATED SURFACES, | ||||
| Egyptian Journal of Agricultural Research | ||||
| Article 22, Volume 91, Issue 1, March 2013, Page 285-302 PDF (1.35 MB) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/ejar.2013.161621 | ||||
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| Authors | ||||
| HELMY E. GAD1; SAFYA M. EL-GAYAR2 | ||||
| 1Mechanical Power Engineering Department, Faculty of Engineering, Mansoura University, El-Mansoura 35516, Egypt, | ||||
| 2Senior researcher, Agric. Eng. Res. Inst., A. R. C, Giza, P.O. 256, Egypt, | ||||
| Abstract | ||||
| The effective Absorbance of different surfaces to the total solar radiation flux incident depends mainly on its color. The surface color of buildings, greenhouses, mulchs and absorbing surfaces (solar collectors) affect the amount of absorbed total solar radiation. The surface requires high absorptance for solar radiation when heating is obliged and low Absorbance if heating is not required. To test the absorptance of some coated surfaces an experimental setup to measure the surface temperature is designed and installed at the Thermal laboratory, Mechanical power engineering department, Faculty of Engineering, Mansoura University. Some local paints are used for surface coatings such as blackboard, polish black, white, red, yellow and the natural color of Galvanized iron (G.I.) sheet (gray color). Results have shown graphically that, the plate painted with blackboard paint has the highest temperature and hence the highest absorptance for solar radiation. The next effective Absorbance for solar radiation is achieved by the plates that painted polish black, not painted (gray color) and the red color, respectively. Whereas the lowest effective Absorbance occurred by the surfaces painted white and yellow with glass. The same trends have graphically observed without glass cover. But, there was a drop of plate temperatures and also scattering. While, white coated plate has the lowest temperature and hence the lowest Absorbance for solar radiation. | ||||
| Keywords | ||||
| Solar Absorbance; Coated Surfaces | ||||
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