A picture window has dimensions of 1.40m × 2.50m and is made of glass 5.60 mm th

Question

A picture window has dimensions of 1.40m × 2.50m and is made of glass 5.60 mm thick. On a winter day, the outside temperature is -20.0 C , while the inside temperature is a comfortable 19.0 C .

A.) At what rate is heat being lost through the window by conduction?

H = _____________ W

B.) At what rate would heat be lost through the window if you covered it with a 0.750 mm-thick layer of paper (thermal conductivity 0.0500 W/mK)?

H = _____________ W

Show clear work and provide equations! Thank you! Will rate answer!

Explanation / Answer

A)

P = KA (delta T ) /L

k = 0.8 for glass

P = 0.8 (1.4x2.5) (19+20) /0.0056

P = 19500 W

B)

Req = L1/K1A +L2/K2A

Req = 0.002 +0.00428 = 0.00628

P = delta T / Req

P = 6204.5 W

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