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(a) An inventor claims to have developed a refrigeration unit with a COP of 8.5 which maintains the refrigerated space at -10oC while operating in a room where the temperature is 25oC. Can this claim be correct?
(b) Consider an engine in outer space which operates on the Carnot cycle. The only way in which heat can be transferred from the engine is by radiation. The rate at which the heat is radiated is proportional to the fourth power of the absolute temperature and to the area of the radiating surface. Show that for a given power output and a given TH, the area of the radiator will be a minimum when TL/TH = ¾.
water gate is hinged at point o. angle between the gate and the ground is given alpha 60 degrees. the gate opens when
Hollow shaft transmitting power with shear limits. Design a hollow steel shaft to transmit 300 hp at 75 rpm without exceeding a shear tress of 8000 psi. Use 1.2:1 as the ratio of the outside diameter to the inside diameter.
a long power transmission cable is buried at a depth ground-to-cable-centerline distance of 2 m. the cable is encased
a seesaw is 20 feet long with a fulcrum at the center. three children want to get on at the same time. the masses of
Calculate the e?ciency of the furnace if the speci?c heat capacity of the water is cp = 4.2kJ/(kgK) and the zero level of enthalpy is at 0?C! (η = 79.6%)
saturated water vapor is contained in a closed rigid tank. the water is cooled to a temperature of 110 o c. at this
r-134a enters a water-cooled compressor as saturated vapor at 1 bar with a mass flow rate of 0.9 kgmin. the inlet area
To determine the heat transfer characteristics of a cylinder under cross flow conditions when the cylinder is isolated.
an individual presently owns an oil lease. the payments from this lease beginning at the end of this year are 10000
a 0.2 lb block is initially moving horizontally at 5 fts when r1 4 ft it slides around the smooth inside surface of
What are the critical temperatures and pressures for Air, Ammonia, CO2 and Propane? Determine the specific volume of Air, Ammonia, CO2 and Propane at 1000C and 20 bar. Determine the specific volume of Air, Ammonia, CO2 and Propane at 1000C and 20 bar..
liquid water flows isothermally at 75of through a one-inlet one-outlet duct operating at steady state. the ducts inlet
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