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A Kansas farmer heats his house with a heat pump using R134a, generating a temperature of 50 deg C at the exit of the (isentropic) compressor. The evaporator is buried at a depth of 2 meters and has a temperature of 15 degrees C. The evaporator exit, which is the compressor entrance, is saturated vapor. Assume that the condenser exit is liquid, whose temperature is 7 degrees below saturated liquid. Assume a throttling valve is downstream of the condenser. Determine the coefficient of performance.
an isobaric heating process raises the temparature of one of one mole of an ideal gas by delta t 100 k. the heat
a household refrigerator with a coefficient of performance of 2.4 removes energy from the refrigerated space at a rate
a mass of 1.0 kg sits atop a spring mounted to the ground. the system is subjected to a half-sine shock pulse of
a rigid insulated cylinder is divided into two parts by a non-insulated frictionless piston which is initially held a
steam enters a turbine at 40 bars 440c and 100 ms through an pipe with a cross-sectional area of 0.050 m2. at the exit
a 25-hp 240-v 77.8-a shunt motor has an armature resstence of 0.083 ohms and a field-circuit resistance of 125 ohms.
two frictionless balls are placed in a frictionless bowl. the left ball a has a radius of 3.00 in. and a weight of 10.0
a frictionless piston-cylinder is filled with 3 liters of water at 250 kpa. initially the temperature of the water is
we have a laminar fully developed channel flow of water with density 1000 kgm3 and kinematic viscosity 1.3x10-6 m2s.
determine the actual and minimum theoretical operating costs, each in $/day.
a jet of air from a nozzle is blown at right angles against a wall in which a pressure tap is located. a manometer
How many engagement points on the flywheel would be necessary to make this machine safe?
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