Engineering, 04.12.2019 05:31 keilahkimbrough8

Atwo-stage compression refrigeration system operates with refrigerant-134a between the pressure limits of 1.4 and 0.10 mpa. the refrigerant leaves the condenser as a saturated liquid and is throttled to a flash chamber operating at 0.4 mpa. the refrigerant leaving the low-pressure compressor at 0.4 mpa is also routed to the flash chamber. the vapor in the flash chamber is then compressed to the condenser pressure by the high-pressure compressor, and the liquid is throttled to the evaporator pressure. assuming the refrigerant leaves the evaporator as saturated vapor and both compressors are isentropic, determine a. the fraction of the refrigerant that evaporates as it is throttled to the flash chamber b. the rate of heat removed from the refrigerated space for a mass flow rate of 0.25 kg/s through the condenser, c. the coefficient of performance.

Answers: 3

Show answers

Another question on Engineering

Engineering, 04.07.2019 18:10

Coiled springs ought to be very strong and stiff. si3n4 is a strong, stiff material. would you select this material for a spring? explain.

Answers: 2

Answer

Engineering, 04.07.2019 18:10

Compute the pressure drop of 30°c air flowing with a mean velocity of 8 m/s in a circular sheet-metal duct 300 mm in diameter and 15 m long. use a friction factor, f 0.02, and pair = 1.1644 kg/m a. 37.26 pa b. 25.27 pa n c. 29.34 pa d. 30.52 pa

Answers: 1

Answer

Engineering, 04.07.2019 19:10

The air in an automobile tire with a volume of 0.015 m3 is at 32°c and 140 kpa gage. determine the amount of air that must be added to raise the pressure to the recommended value of 206 kpa gage. assume the atmospheric pressure to be 128 kpa and the temperature and the volume to remain constant.[r-0.287 kj/kgk]

Answers: 3

Answer

Engineering, 04.07.2019 19:20

Liquid flows at steady state at a rate of 2 lb/'s through a pump, which operates to raise the elevation of the liquid 100 ft from control volume inlet to exit. the liquid specific enthalpy at the inlet is 40.09 btu/lb and at the exit is 40.94 btub. the pump requires 3 btu/s of power to operate. if kinetic energy effects are negligible and gravitational acceleration is 32.174 tt/s, the heat transfer rate associated with this steady state process is most closely 1)-2,02 btu/s from the liquid to the surroundings 2)-3.98 btu/s from the surroundings to the liquid. 3)-4.96 btu/s from the surroundings to the liquid. 4)-1.04 btu/s from the liquid to the surroundings.

Answers: 2

Answer

You know the right answer?

Atwo-stage compression refrigeration system operates with refrigerant-134a between the pressure limi...

Questions