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دانلود رایکان مقاله انگلیسی ISI با موضوع مدل تحلیلی ضریب هدایت گرمایی عایق شفاف کندوئی مرکب مضاعف

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مدل تحلیلی ضریب هدایت گرمایی عایق شفاف کندوئی مرکب مضاعف و اعتبار یابی مدل

عنوان انگلیسی مقاله:

Analytical model for the thermal conductance of double-compound honeycomb transparent insulation, with validation

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1. Introduction
Honeycomb transparent insulation has found application in building insulation, in skylights, as well as in solar collectors. A recent review of this and other transparent insulations has been given by Hollands et al. (2001). Heat transfer takes place through the honeycomb by the coupled modes of radiation and conduction. (The honeycomb cell size is normally small enough to eliminate any convective heat transfer.) Modeling the thermal conductance of honeycombs formed the subject of many early studies, in which the honeycomb was assumed to be bounded solid opaque plates adjacent to both faces. Hollands and Iynkaran (1984) suggested leaving an air-gap between one bounding surface and the adjacent honeycomb face, forming what has come to be known as the ‘‘compound honeycomb’’. (The purpose of the air gap is to de-couple the radiative and conductive modes near a low emissivity plate.) Platzer (1992), Hollands and Iynkaran (1993) and Arulanantham and Kaushika (1996) have presented more recent thermal-conductance models.

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