Sustainable Energy, SI Edition
Sustainable Energy, SI Edition
2nd Edition
ISBN: 9781337672092
Author: DUNLAP, Richard A.
Publisher: Cengage Learning
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A 50-L electrical radiator containing heating oil is placed in a 50-m³ room. Both the room and the oil in the radiator are initially at 5°C. The radiator with a rating of 3 kW is now turned on. At the same time, heat is lost from the room at an average rate of 0.3 kJ/s. After some time, the average temperature is measured to be 20°C for the air in the room, and 60°C for the oil in the radiator. Taking the density and the specific heat of the oil to be 950kg/m³ and 2.2kJ/(kg °C), respectively, determine how long the heater is kept on. Assume the room is well-sealed so that there are no air leaks.
Calculate the decrease in heat loss in kilowatt-hours per day when a 1.2 m x 2.1 m uncoated single-pane window is replaced with a double-glazed window with a low-e coating and argon fill (a relatively common configuration for current win- dows). The inside temperature is a constant 20°C, and the outside temperature is a constant -5°C.
Heat power loss from a district heating line with two separate pipes: How big is the loss in W / m? Conditions: Outer pipe diameter of 100 mm, insulation thickness of 50 mm, thermal conductivity of insulation of 0.03 W / mK, ground thermal conductivity of 1.5 W / mK, distance of 1 m between pipe center and ground surface, distance of 0.6 m between pipe center, forward temperature of 80 °C, return temperature of 50°C, and ambient temperature of 5°C.
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