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Refrigerent 134a at a flow rate of 0.5 lb/s enters a heat exchanger in a refrigeration system operating at steady state as saturated liquid at 20 degrees Fahrenheit at a pressure of 20lbf/in^2. A separate air stream passes in counter flow to the refrigerant 134a stream, entering at 120 degrees Fahrenheit and exiting at 77 degrees Fahrenheit. The outside of the heat exchanger is well insulated. Neglecting kinetic and potential energy effects and modeling the air as an ideal gas, determine the mass flow rate of air, in lb/s.
a gas is confined by a piston 10 cm in diamater on which rests a weight. the mass of the piston and weight together is
this problem is problem 3.73 of the 8th edtion of this book. there are solutions from a previous version floating
when the rubber bands of the sling shot are pulled back each rubber band is stretched 3 in. the natural length and the
a 40 student class is to be air conditioned with window air conditioning units each with 5 kw cooling capacities. a
water at 200 lbfin2 and 300 f is throttled adiabatically through a valve to 30 lbfin2. the inlet velocity is 5 fts and
cooling water enters a cooling tower at a rate of 1000 kgh and 70 degree c. water is pumped from the base of the lower
a solid object of aisi 302 steel at a temperature of 850?c is quenched in mineral oil at a temperature of 25?c. the oil
What is the initial velocity of Block B, constant acceleration of Block A, velocities of both blocks at t=3s, and the total distance traveled by block B from t=0s to t=3s?
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
consider an ideal gas contained in a cylinder that can do work by pushing against a piston which has a surface area of
a free piston-cylinder system initially contains 8 kg of saturated liquid water at 275 kpa initial state. the water in
question a soap bubble with walls 398 thick floats in air. if this bubble is illuminated perpendicularly with sunlight
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