In a hot air heating system, air at the furnace is heated to 93.0 0C. A...
In a hot air heating system,
air at the furnace is heated to
93.0 0C. A window is open in the
house and the house temperature
remains at 13.0 0C. If the furnace
can deliver 5.60 m3/min of air, how
much thermal energy per hour is
transferred from the furnace to the
room?
Homework Answers
density of air = 1.2754 kg/m3
mass flow rate = 5.6 x 1.2754 kg/m3 = 7.14 kg/min
thermal enegy transfered = mCdT
mass transfered in 1 hour = 7.14 kg/min x 60 = 428.5 kg
specific heat of air = 0.718kJ/kg
temperature difference = 93 - 13 = 80
energy tranfer = 428.5 x 80 x 0.718 = 24615 kJ
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