Measurement of local heat flow in flat evacuated glazing

A guarded hot-plate apparatus has been developed for measuring the local thermal conductance of flat evacuated glazing. Parasitic heat flows in the apparatus have been reduced to below an equivalent thermal conductance of 0.01 W m 2 K 1. Techniques are described for determining the separate contribu...

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Bibliographic Details
Published in:International journal of heat and mass transfer 1993-07, Vol.36 (10), p.2553-2563
Main Authors: Collins, R.E., Davis, C.A., Dey, C.J., Robinson, S.J., Tang, J.-Z., Turner, G.M.
Format: Article
Language:English
Subjects:
Applied sciences
Buildings
Buildings. Public works
Exact sciences and technology
External envelopes
Opening. Closure. Circulation (stairs, etc.)
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Summary:A guarded hot-plate apparatus has been developed for measuring the local thermal conductance of flat evacuated glazing. Parasitic heat flows in the apparatus have been reduced to below an equivalent thermal conductance of 0.01 W m 2 K 1. Techniques are described for determining the separate contributions to heat flow through the sample from pillar conduction, conduction through residual gas, and radiation. The accuracy of the measurement system is estimated to be better than ±2% and the reproducibility for sequential measurements is better than ±0.004 W m 2 K 1 for a measurement area of approximately 1.7 cm 2.
ISSN:0017-9310
1879-2189
DOI:10.1016/S0017-9310(05)80193-0