Question

i need problem 4.8.1 answered. This has all then needed information given.

Press, New York. eat pro- van Waversveld, J, A. D. E. Addink, G. van den Thillart, and H. Smit. 1989. H duc Part A: Physiology, 92(2):159-162. tion of fish: A literature review. Comparative Biochemistry and Physiology 4.8 Problems 4.8.1 Reduction of Heat Loss Using a Stagnant Air Film Compare the heat loss in W from two windows of a room, one having a single sheet of glass 10mm thick while the other has two sheets of glass, 5mm each, separated by 5mm of air. The second window is called a thermopane. The window sizes are 1mx1m. The air temperature in the room is 20°C and the outside air temperature is -5°C. The average value of the thermal conductivity of glass is 0.85 W/m.K and that of air is 0.025 W/mK over this temperature range of interest. The heat transfer coefficient corresponding to slower moving air inside the room is 20 W/m2 K and that of the faster moving air outside is 200 W/m2 .K. Consider the thin layer of air between the glass sheets to be stagnant.

Answer 1

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