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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.
member abc has a mass of 2.4-kg and is attached to a pin support at b. and 800 g sphere d strikes the end of member abc
Consider heat transfer through a wall comprised of two solid layers, each 4m x 4m. When perfect contact is maintained between the layers, the steady state temperature profile across the wall might look like that shown below
If it is possible to do so without additional information, calculate the percent excess air supplied to the furnace: if more information is needed, state what it is and outline the calculation of the percent excess air.
During an expansion process, the pressure of a gas changes from 10 to 97 psia according to the relation P = aV + b where a = 5.1 psia/ft3 and b is constant. If the initial volume of the gas is 7.6 ft3, calculate the work done during the process.
control engineeringyou have to design a control system for an annealing furnace. the furnace is used to anneal special
When a positron and an electron meet, they are both annihilated into pure energy. Calculate how much energy (in MeV) is released in this reaction assuming that each particle is moving at 50% the speed of light. For this question use the classical def..
the ocean thermal energy conversion otec power plant takes advantage of the temperature difference between ocean
A two-dimensional reducing bend as shown is used to control flow rate and direction of flow in a home air conditioning duct. In the reducing bend shown, there is a linear velocity profile at section (1). The flow is uniform at sections (2) and (3). T..
a w200 x 31.3 rolled-steel beam is subjected to a couple m of moment 45 kn.m. knowing that e 200 gpa and v 0.29
the density and associated percent crysallinity for two nylon 66 materials are shown as follows compute the desities of
Calculate the applied bending moment on a 60 mm x 160 mm rectangular beam with a maximum bending stress of 20,000 kPa.
the space between two horizontal parallel flat plates 0.5 cm apart is filled with oil of viscosity ?micro 0.05 kgm.s.
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