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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.
Your family cabin now has a roof that is rectangular, 60 feet by 20 feet, and is covered by 2 inch thick hardwood siding and tapped wood shingles. You propose adding 2 inches of cellulose fiber insulation under the hardwood.
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What would be the Horizontal and vertical component from this acting force see diagram
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Water is flowing in a horizontal 200-mm diameter pipe at a rate of 0.05 m^3/s, and the pressures at sections 80 m apart are equal to 500 kPa at the upstream section and 400 kPa at the downstream section.
Determine the cycle time for a single engine scraper rated at 21 cy heaped that is used to haul material from a pit to a fill 900 ft away under severe conditions. The average haul speed will be 14 mph and the average return speed will be 20 mph.
Describe the reasons for enhancing drainage and situation where it is required. Explain some of the detrimental effects of drainage. Describe the types of drainage system indicating suitability criteria. 200- 250 word limit
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