Consider a room with a 1.8-m-high and 2.0-m-wide double- pane window consisting of two 4-mm-thick layers of glass separated by a 10-mm-wide stagnant air space. The convection heat transfer coefficients on the inner and outer surfaces of the window are 12 W/m? K and 25 W/m? K, respectively, while the average thermal conductivity of glass is 0.78 W/m K; and the air, 0.026 W/m K. If the room is maintained at 22C. the outside temperature is -4 °C and heat transfer due to radiation can be neglected, determine: (i) Draw the sketch and thermal resistance network: (ii) the total thermal resistance; (iii) the steady rate of heat transfer through this double-pane window (iv) the temperature of the inner surface of the window.
Consider a room with a 1.8-m-high and 2.0-m-wide double- pane window consisting of two 4-mm-thick layers of glass separated by a 10-mm-wide stagnant air space. The convection heat transfer coefficients on the inner and outer surfaces of the window are 12 W/m? K and 25 W/m? K, respectively, while the average thermal conductivity of glass is 0.78 W/m K; and the air, 0.026 W/m K. If the room is maintained at 22C. the outside temperature is -4 °C and heat transfer due to radiation can be neglected, determine: (i) Draw the sketch and thermal resistance network: (ii) the total thermal resistance; (iii) the steady rate of heat transfer through this double-pane window (iv) the temperature of the inner surface of the window.
Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)
8th Edition
ISBN:9781305387102
Author:Kreith, Frank; Manglik, Raj M.
Publisher:Kreith, Frank; Manglik, Raj M.
Chapter1: Basic Modes Of Heat Transfer
Section: Chapter Questions
Problem 1.48P: A horizontal, 3-mm-thick flat-copper plate, 1-m long and 0.5-m wide, is exposed in air at 27C to...
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