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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.
What is the average length of queue, the average time spent in the system, and the average waiting time in the queue?
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A sample of 20 yields a mean 32.4. Test the two sided hypothesis that the sample drawn from a population with a mean of 35 for the following cases. (a) if a variance of the population is 33; and (b) if the variance of the population is unknown,
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A freeway exit ramp has a single 12-foot lane and consists entirely of a curve with a central angle of 90 degrees and L=628 feet. If the distance cleared of obstacles is 19.4 feet from the centerline, what design speed was used
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As part of the procurement or contracting department of this federal agency, you need to demonstrate your understanding of the different project delivery methods and contract types available to the agency.
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