Transmittance-absorptance product of solar glazing with transparent insulation materials |
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Authors: | ND Kaushika M Arulanantham |
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Affiliation: | Centre for Energy Studies, Indian Institute of Technology, Hauz Khas, New Delhi 110 016, India |
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Abstract: | The transmittance-absorptance product of solar glazing containing the transparent insulation material (TIM) of square celled honeycomb is investigated. A method is developed for the determination of transmittance-absorptance product of beam, sky and ground diffuse solar radiations using the individual transmittances of cellular array and encapsulating covers; the internal reflections are taken into account. Three practical cases; cellular array, cellular array with top cover, and cellular array with top and bottom covers are considered. The results are presented for beam radiation as a function of angle of incidence and sky and ground diffuse radiation as a function of tilt angle. The predicted results are tested by measuring the global radiation transmittance of commercial TIM; the predicted results deviate from the measurements by an average of 2.0%. |
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Keywords: | Transparent insulation materials Solar glazing Transmittance-absorptance product Solar energy materials |
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