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|Title:||Effect of plastic cover thickness on top loss coefficient of flat-plate collectors|
|Authors:||Wijeysundera, N.E. |
|Source:||Wijeysundera, N.E.,Iqbal, M. (1991). Effect of plastic cover thickness on top loss coefficient of flat-plate collectors. Solar Energy 46 (2) : 83-87. ScholarBank@NUS Repository.|
|Abstract:||The effect of plastic cover thickness on the top heat loss coefficient of collectors with outer glass and inner Teflon glazings is investigated. The total radiative properties of the Teflon films are computed from measured normal incidence spectral data. These properties are used in the overall heat transfer analysis of the system. Results are obtained for plastic thicknesses from 12.5 μm to 100 μm, over a range of wind heat loss coefficients and several absorber emissivities. These values are compared with those for collectors with glass covers and the difference is correlated with the important design variables. The results show that for low values of the absorber emissivity (e.g., those with selective coatings), the dependence of the loss coefficient on the film thickness is small. However, in the case of most frequently encountered collectors which have a high absorber plate emissivity, the thickness of the plastic cover can have a significant effect on the collector heat loss coefficient. This is true for the single-plastic cover and two-plastic cover systems. A design correlation for the top heat loss coefficient is presented in terms of the plastic cover thickness. © 1991.|
|Source Title:||Solar Energy|
|Appears in Collections:||Staff Publications|
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