It is believed that the use of transparent insulation materials (TIM) is prospective in the fields of solar energy and architecture engineering. Semi-transparent films are the basic constituents of some TIM, e.g., honeycomb structure. Two most important characteristics of semi-transparent films are their transmittance for solar radiation and emittance for long wave thermal radiation. In this paper, a technique for determining the optical constants of these films is presented. The thermal radiation properties of several semi-transparent films are reported. [References: 10]
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