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A vapor-compression refrigeration system for a household refrigerator has a refrigerating capacity of 1000 Btu/h. Refrigerant enters the evaporator at 2108F and exits at 08F. The isentropic compressor efficiency is 80%. The refrigerant condenses at 958F and exits the condenser subcooled at 908F. There are no significant pressure drops in the flows through the evaporator and condenser. Determine the evaporator and condenser pressures, each in lbf/in.2, the mass flow rate of refrigerant, in lb/min, the compressor power input, in horsepower, and the coefficient of performance for (a) Refrigerant 134a and (b) propane as the working fluid.
an unguided weapon is launched off a fighter aircraft flying at 500kts 844 fts straight and level at an altitude of
toughness is proportional to the amount of energy storedput in to a material or structure when a stress is applied.
a diesel cycle works on compression ratio of 18 and temperature at the start of compression is given as 300k. take cut
The force F required to compress a spring a distance x is given by F - Fo = kx where k is the spring constant and Fo is the preload. Determine the work required to compress a spring, whose spring constant is k = 37 kN/m, a distance of 2 cm starting f..
water at 4oc is to be delivered to the top of a ski area for snowmaking purposes. the water is to be drawn from a
The reciprocating radial roller follower of a plate cam profile with 0.7 in offset is to rise 2 in with simple harmonic motion in 180 degrees of cam rotation and return with simple harmonic motion in the remaining 180 degrees. If the roller radius is..
The composite shaft consists of three sections: 1) a solid brass core, 2) a middle steel tube, and 3) an outer aluminium tube. The brass core (Gb= 39 GPa) has a diameter of 50 mm. The steel tube (Gs= 77 GPa) has an inner diameter of 50 mm and an ou..
The slope of the channel is 0.0020 ft/ft. Compute a chart showing the relationship be- tween reservoir elevation and discharge into the channel.
a painter is standing on a work platform that is 27 feet above ground level. for fall protection the workers safety
dry air enters an industrial dryer with a pressure of 101 kpa a temperature of 250c and a mass flow rate of 2.6kghr
a refrigerator cycle has a cop of 3 and removes 100kw of heat from a building which is kept at 23c. the device rejects
determine the velocity of its center when it reaches the end of the bowling lane.The ball is always in contact with the bowling lane during its motion. the bowling ball may be assumed to be a uniform solid sphere with a mass of 7 kg and diameter o..
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