A 1500 W Portable Heater Is Needed to Replace the Heat

question 25

Multiple Choice

A 1500 W portable heater is needed to replace the heat lost through a circular window (radius 25 cm) in the wall of a home that is made of a single pane of glass 0.30 cm thick.Thermal conductivity for the glass is 0.63 W/mK.The temperature inside the house is 20 $^{\circ}$ C and outside is -12 $^{\circ}$ C.What is the thickness of the window?

• A) 0.84 mm
• B) 4.2 mm
• C) 2.6 mm
• D) 0.66 mm

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