1–138 The rate of heat loss through a unit surface area of a window per unit temperature difference between the in- doors and the outdoors is called the U-factor. The value of the U-factor ranges from about 1.25 W/m² · °C (or 0.22 Btu/h · ft² . °F) for low-e coated, argon-filled, quadruple-pane windows to 6.25 W/m² · °C (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 temper- ature is -8°C. 1.2 m Indoors 20°C Outdoors -8°C 18 m 190

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Mechanisms of heat transfer

Heat transfer is an essential discipline in thermal engineering that deals with the transfer, conversion, usability, and creation of heat or thermal energy. Transfer of heat occurs through various mechanisms like conduction, convection, radiation, and change of phases. All these mechanisms have distinct characteristics, but these mechanisms can simultaneously occur in an identical system.