# 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/m^{2 }· K (or 0.22 Btu/h · ft^{2 }· °F) for low-e coated, argon-filled, quadruple-pane windows to 6.25 W/m^{2 }· K (or 1.1 Btu/h · ft^{2 }· °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.

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**Related Book For**

## Heat And Mass Transfer Fundamentals And Applications

**ISBN:** 9780073398181

5th Edition

**Authors:** Yunus Cengel, Afshin Ghajar

**Question Details**

Chapter #

**1**- INTRODUCTION AND BASIC CONCEPTSSection: Problems

Problem: 125

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