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A refrigeration system, using R-22 as the working fluid, has condenser and evaporator pressures of 250 psi and 30 psi, respectively. The refrigerant passes through each heat exchanger with a negligible pressure drop. At the inlet and exit of the compressor, the temperatures are 10 oF and 300 oF, respectively. The heat transfer rate from the working fluid passing through the condenser is 50,000 Btu/h, and liquid refrigerant exits at 250 psi and 105 oF. If the compressor operates adiabatically, determine:
(a) the compressor power input, in hp.
(b) the coefficient of performance of the system.
(c) the isentropic efficiency of the compressor.
An air bubble rises from the bottom of a well where the temperature is 25°C, to the surface where the temperature is 27°C. Find the percent increase in the volume of the bubble if the depth of the well is 5 m. Atmospheric pressure is 101,528 Pasca..
Assuming that within metal crystals, the atoms can be considered as hard spheres in contact, sketch arrangement of atoms in a (100) plane, a (110) plane and a (111) plane of face-centered cubic structure. Determine the number of atoms contained wi..
What is the mass flow rate of oxygen in lbm/s? Note that the inside diameter of a nominal 2 inch schedule 40 steel pipe is 2.067inches. Assume ideal gas principles apply.
Consider 6.0 kg of austenite containing 0.45 wt% C, cooled to below 727 degrees Celcius (1341 degrees Farenheit).
Refrigerant 134a at 700 kPa and 40oC is expanded adiabatically in a closed system to 60 kPa. Determine the work produced, in kJ/kg, and final enthalpy for an isentropic expansion efficiency of 80.
initially an insulated rigid tank contains 18.67 kg of water at 21.45oc and 101 kpa. the tank also contains a 3.66 kg
a 50 cm long 800 w electric resistance heating element with diameter .5 cm and surface temperature 120c is immersed in 60 kg of water temperature to 80c. also determine the convection heat transfer coefficients at the beginning and at the end of t..
some of our modern kitcgen cookware is made of ceramic materials. a compare the relative properties and cost of three
Titanium in the BCC structure has a radius of 0.1423 nm.
find the sum of two harmonic motions of equal amplitude but of slightly different frequencies. discuss the beating
consider an ideal vapor-compression refrigeration cycle. the refrigerator employs refrigerant 134a as the working fluid
suppose that 100 lmin are drawn from a fermentation tank and passed through an extraction tank in which the
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