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Refrigerant 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 l
two of the above devices are placed in series to form a particulate removal system. calculate the collection efficiency
heat is generated uniformly inside a 20-mm thick plane wall at a rate of 20000 wm3. the thermal conductivity of the
a harmonic motion is expressed as xt 0.6cos18pit - pi6 where xt is measured in inches t in seconds and the phase angle
the acceleration due to gravity at an altitude y above the surface of the earth is given byymnbspnbspnbsp
a fireworks shell is launched vertically from point a with speed sufficient to reach a maximum altitude of 500 ft. a
a 15-mm od copper tube conveys hot hydraulic oil. in order to dissipate the heat and cool the oil someone suggests that
a 35 api distillate at 60 f is to be pumped a distance of 2000 ft through a 4 in. sch 40 horizontal pipeline at a flow
a 1 m3 rocket-propellant chamber is tilled with combustion gases at 3000 k and 7 mpa at the instant combustion ceases.
for the piping diameter changes and flow directions shown below if the velocity at the input is 5 ms the initial
A cylindrical specimen of this alloy 24 mm in diameter and 186 mm long is to be pulled in tension. Calculate the force necessary to cause a 0.0119 mm reduction in diameter. Assume a value of 0.33 for Poisson's ratio.
you are trying to pump storm water out of your basement during a storm. the pump can extract 0.6 ls. the water level in
the ideal rakine cyle has steam leaves the boiler at 800psia and 1000f. the turbine exit is at 1.276 psia with a
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