Engineering, 25.04.2020 00:50 devinm9099

A vapor-compression refrigeration system operates at steady state with propane as the working fluid and has a capacity of 5 tons. Saturated vapor at 0oF enters the compressor and exits as superheated vapor at 120 oF and 180 lbf/in2. Heat transfer from the compressor to its surroundings occurs at a rate of 3.5 Btu per lb of refrigerant passing through the compressor. Liquid refrigerant enters the expansion valve at 85 oF and 180 lbf/in2. The condenser is water-cooled with water entering at 65oF and leaving at 80 oF with a negligible change in pressure. Determine: (a) the compressor power input, in horsepower, (b) the mass flow rate of cooling water through the condenser, (c) the coefficient of performance, and (d) the coefficient of performance if the system is operated as a heat pump.

Answers: 3

Show answers

Another question on Engineering

Engineering, 04.07.2019 18:20

Steam enters a converging nozzle at 3.0 mpa and 500°c with a at 1.8 mpa. for a nozzle exit area of 32 cm2, determine the exit velocity, mass flow rate, and exit mach number if the nozzle: negligible velocity, and it exits (a) is isentropic (b) has an efficiency of 94 percent

Answers: 2

Answer

Engineering, 04.07.2019 18:20

Air flows over a heated plate àt a velocity of 50m/s. the local skin factor coefficient at a point on a plate is 0.004. estimate the local heat transfer coefficient at this point.the following property data for air are given: density = 0.88kg/m3 , viscosity 2.286 x 10 ^-5 kgm/s , k = 0.035w/mk ,cp = 1.001kj/kgk. use colburn reynolds analogy.

Answers: 1

Answer

Engineering, 04.07.2019 19:20

At steady state, air at 200 kpa, 325 k, and mass flow rate of 0.5 kg/s enters an insulated duct having differing inlet and exit cross-sectional areas. the inlet cross-sectional area is 6 cm2. at the duct exit, the pressure of the air is 100 kpa and the velocity is 250 m/s. neglecting potential energy effects and modeling air as an 1.008 kj/kg k, determine ideal gas with constant cp = (a) the velocity of the air at the inlet, in m/s. (b) the temperature of the air at the exit, in k. (c) the exit cross-sectional area, in cm2

Answers: 2

Answer

Engineering, 05.07.2019 19:10

Tech a says never use a water hose to clean up dust after a repair. tech b says never use a floor scrubber to clean up dust after repairs. who is correct?

Answers: 1

Answer

You know the right answer?

A vapor-compression refrigeration system operates at steady state with propane as the working fluid...

Questions