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A solar collector receives radiation (energy via heat transfer) at the rate of 0.315 kW per m2 of collector area. The total area of the collector is 40 m2. Assume the collector provides this energy to a thermal storage unit (a thermal reservoir) at 220oC. A heat engine receives energy from this thermal storage unit and discharges energy by heat transfer to the surroundings at 20 C (also a thermal reservoir).
a. What is the rate of energy input to the thermal storage unit from the solar collector (kW)? Ans. 12.6 kW
b. Determine the theoretical maximum efficiency of the heat engine.
c. What is the power output of the engine?
d. What is the rate of heat rejection from the engine to the surroundings (kW)?
e. If the actual efficiency of the engine is only 50% of the theoretical maximum how much collector area (m2) would be required to produce the same amount engine power (as determined in part (c)?
A rectangle channel 20 feet wide carries a discharge Q= 200cfs. Compute the critical depth and critical velocity for the flow in the channel.
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Estimate the critical pressure of a mixture of methane and n-hexane if the critical temperature of the mixture is known to be 200 F. Compare your answer with the critical pressures of pure methane and pure n-hexane.
A concrete beam that is simply supported sustains a uniform live load of 1.8 kips/ft and a uniform dead load (not including self weight) of 1 kips/ft on a span of 24 ft. Determine the layout for a set of No.3 U-stirrups with Fy=60 ksi and F'c=3.5 ..
An undistured soil sample has a dry unit wieght of 112 pcf with specific gravity of solids equal to 2.68. a. What is the void ratio of the sample b. What is the porosity of the sample
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