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A room 7m x 6m x 3m high is to be electically heated to maintain the inside temperature at 20 C, when it is 0 C outside. The room has 2 windows each 1.2m x 1.8m and a sliding glass door 2.4m x 2.1m. The transmission coefficients u in Wm^2/C are given below.
Floor: concrete slab (100mm thick) : 11.5 W/m^2/C
Walls: Cavity Brick (280mm thick) : 2.0 W/m^2/C
Windows and door (Single glazed) : 5.8 W/m^2/C
Ceiling: (do not consider a roof) : 1.0 W/m^2/C
Ignore the effects of furnishings, presence of humans, orientation to sun or any wind exposure
Assume:
There is no requirement to heat the air in the room
Calculate the power rating of the electric heater required to maintain the required temperature.
Water is pumped 9 mi from a reservoir at elevation 100 ft to a second reservoir at elevation 210 ft. The pipeline connecting the reservoirs has a 54-in diameter. It is concrete and has an absolute roughness of 0.003.
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rom a photograph one observes that on a level section of highway 10% of the vehicles are trucks, 90% are cars, and that there are 50 vehicles per mile of highway. The trucks travel at 40 mph, and the cars at 50 mph.
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Investigate the possibility of environmental problems that faced by the area of disaster.
Two level sections of an east-west highway (G=0) are to be connected. Currently, the two sections of highway are separated by a 4000-ft (horizontal distance), 2% grade. The western most section of highway is the higher of the two and is at elevati..
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