A 1.0 m × 1.5 m double-pane window consists of two mm-thick layers of glass (k = 0.78 W/m·K) that are the sep- arated by a 5-mm air gap (kair = 0.025 W/m·K). The heat flow through the air gap is assumed to be by conduction. The inside and outside air temperatures are 20°C and −20°C, respectively, and the inside and outside heat transfer coefficients are 40 and 20 W/m2·K. Determine
(a) the daily rate ofjieat loss through the window in steady operation and
(b) the temperature differ- ence across the largest thermal resistence.
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