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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)?
Photovoltaic array, Under insolation conditions of 500 W/m^2 (direct sunlight), and 10% solar cell efficiency
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A pump in a large industrial hall containing 30 liters gasoline breaks down, causing the gasoline to spill into a 3 m2 sump surrounding the pump. The liquid pool is ignited by sparks. Assume the combustion to be 70% effective and the heat loss due..
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each month the splendid dry cleaning company buys one barrel ( 42 gal., 0.160 m^3) of tetrachloroethylene (C2Cl4) (M.W.= 166, p= 1.594 g/cm^3) ninety percent of the fluid is lost to the atmosphere and 10% remains as residue to be disposed of.
Calculate uniform load (in addition to self wt.) which will cause the section to begin cracking
A piston-cylinder contains 40 kg water of which 20 kg is saturated liquid. The equilibrium pressure of the system is 100 kPa. a) Find the system initial volume b) The water undergoes an isothermal expansion until the pressure reaches 10 kPa.
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