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Air enters the evaporator at 14.7 psia and 90 F with a volumetric flow rate of 200 ft3/min. Refrigerant 134a at 20 psia with a quality of 30 % enters the evaporator at a rate of 4 lbm/min and leaves as saturated vapor at the same pressure. Assume steady state operation and negligible pressure changes through the evaporator. Also, assume the air behaves as an ideal gas with constant speci¯c heats. Determine:
a. the rate of heat transfer from the air [Btu/min]
b. the exit temperature of the air [F]
a medical warmer operates using a heat pump. saturated r-12 enters the compressor at a temperature of -10 c and exits
Determine the minimum thickness of fibreglas insulation that needs to be used in the wall in order to avoid condensation on the outer surfaces.
a. calculate the density of air in lbmft3 at standard conditions 75f and 14.7 psia assume m 28.9 lbmlb-mol.b.
Determine the rate of metal removal when the wheel is engaged in the work and if the number of active grits per square inch = 200, determine the average chip length and the number of chips formed per time
Depron is a polystyrene foam, popular as a material for the manufacture of fast food trays and packaging. It is much lighter than balsa wood and can be cut with a sharp blade, sawn with a fine.
1. consider the hoover dam hydro-electric plant located in arizona and nevada. if the average lake level is 160 m above
water at standard atmospheric pressure and temperature fills a sealed rigid container. if the temperature of the water
the mass flow rate of water in a tube is measured using a beaker to catch water during a timed interval. the nominal
A well insulated 3-m X 4-m X 6-m room initially at 7 degrees C is heated by the radiator of a steam heating system. The radiator has a volume of 15 L and is filled with superheated vapor at 200 kPa and 200 degrees C.
a diffuser in a jet airplane intake system is instrumented to give readings of stagnation temperature and stagnation
Calculate limits of tolerance and allowance for a 25mm shaft and hole pair designated H8/d9
the 14 in. spring is compressed to an 8-in. length where it is realeaed fomr rest and accelerate block a. the
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