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Refrigerant-134a enters the evaporator coils placed at the back of the freezer section of a household refrigerator at 120 kPa with a quality of 20 percent and leaves at 120 kPa and -20°C. If the compressor consumes 450 W of power and the COP the refrigerator is 1.2, determine (a) the mass flow rate of the refrigerant and (b) the rate of heat rejected to the kitchen air.
energy from a high-temperature reservoir at 750 k flows at a rate of 2.1 kw to a heat engine. if the engine rejects
write a matlab program that determines the probability of 4 of a kind in a 5-poker draw. dont use formula. create a
Given an aerodynamic body, you have learned in Aerodynamics and Flight Mechanics how to apply the numerical Source Panel Method to this body to determine the velocity and pressure profiles along the surface of the body.
Employing the ideal gas model, determine the change in specific entropy between the indicated states, in Btu/lbmol?ºR. Solve 2 ways: Use the appropriate ideal gas table AND also by using a constant specific heat value.
calculate the rate of heat loss through the vertical walls of a boiler furnace 4m by 3m by 3m high.the walls are
rocket boosts the speed of a spacecraft from 7500 m/s to 10 500 m/s with a thrust of 890 kN. Calculate the rocket power.
a garden hose is open at one end and capped closed at the other. a swimmer in an above-ground pool fills the hose with
consider a 24-kw hooded electric open burner in an area where the unit costs of electricity and natural gas are 0.10kwh
steam at 500 lbfin2 500 f enters a well insulated valve operating at steady state with a mass flow rate of .11 lbs
1. an aluminum casting that weighs 10 pounds sits on a steel surface. how much force will be necessary to get it to
two 415000-lb locomotives pull 41 205000-lb coal hoppers. the train starts from rest and accelerates uniformly to a
a steam turbine power plant is based on the ideal rankine cycle the working fluid is water. the heat transfer from the
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