2. A university building is air-conditioned during the day for 12 hours at a constant temperature...
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2. A university building is air-conditioned during the day for 12 hours at a constant temperature of 22 C. It is covered by a zinc roof with 20 m length, 15 m width, with 0.2 m thickness. The thermal conductivity of this concrete roof is 0.8 W/m.K. During the 12 hours day time, the temperature of outside of the roof surface is maintained at 32 C. a. Is this a steady state condition? Why? b. Can the rate of heat conduction through the roof considered as one-dimensional? Why? c. Determine the rate of heat conduction through the roof during the day. d. Determine the cost of energy to the university administration from this heat conduction process through this roof during the day. The cost of electricity is RM0.70/kWh 2. A university building is air-conditioned during the day for 12 hours at a constant temperature of 22 C. It is covered by a zinc roof with 20 m length, 15 m width, with 0.2 m thickness. The thermal conductivity of this concrete roof is 0.8 W/m.K. During the 12 hours day time, the temperature of outside of the roof surface is maintained at 32 C. a. Is this a steady state condition? Why? b. Can the rate of heat conduction through the roof considered as one-dimensional? Why? c. Determine the rate of heat conduction through the roof during the day. d. Determine the cost of energy to the university administration from this heat conduction process through this roof during the day. The cost of electricity is RM0.70/kWh
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Heat Transfer Through the Roof a Steady State Condition No this is not a steadystate condition Stead... View the full answer
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Auditing and Assurance services an integrated approach
ISBN: 978-0134065823
16th edition
Authors: Alvin A. Arens, Randal J. Elder, Mark S. Beasley, Chris E. Hogan
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