Engineering
Heat And Mass Transfer Fundamentals And Applications
The rate of heat loss through a unit surface area

The rate of heat loss through a unit surface area of a window per unit temperature difference between the indoors

Question:

The rate of heat loss through a unit surface area of a window per unit temperature difference between the indoors and the outdoors is called the U-factor. The value of the U-factor ranges from about 1.25 W/m²· K (or 0.22 Btu/h · ft²· °F) for low-e coated, argon-filled, quadruple-pane windows to 6.25 W/m²· K (or 1.1 Btu/h · ft²· °F) for a single-pane window with aluminum frames. Determine the range for the rate of heat loss through a 1.2-m × 1.8-m window of a house that is maintained at 20°C when the outdoor air temperature is 28°C.

Transcribed Image Text:

Indoors 20°C 1.8 m 1.2 m, Outdoors -8°C O

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The rate of heat loss through a window can be calculated using the formula Q U A T Where Q is the ra…View the full answer

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