Engineering, 18.09.2019 02:30 athenawalcroff
Aheat pump with r-134a as the working fluid is used to keep a space at 25°c by absorbing heat from solar-heated water that enters the evaporator at 50°c at a rate of 0.065 kg/s, and leaves at 40°c. refrigerant enters the evaporator at 20°c with a quality of 15% and leaves at the same pressure as saturated vapor. if the compressor consumes 1.2 kw of power, determine (a) (0.5 point) the mass flow rate of the refrigerant, (b) (0.5 point) the rate of heat supply, (c) (0.5 point) the cop, and (d) (0.5 point) the minimum power input to the compressor for the same rate of heat supply.
Answers: 2
Engineering, 03.07.2019 14:10, makaylashrout77
Amass of 1.5 kg of air at 120 kpa and 24°c is contained in a gas-tight, frictionless piston-cylinder device. the air is now compressed to a final pressure of 720 kpa. during the process, heat is transferred from the air such that the temperature inside the cylinder remains constant. calculate the boundary work input during this process.
Answers: 2
Engineering, 03.07.2019 15:10, margaret1758
If you were designing a bumper for a car, would you prefer it to exhibit elastic or plastic deformation? why? consider the functions of a bumper in both a minor "fender-bender" and a major collision.
Answers: 1
Engineering, 04.07.2019 18:10, soreese02
An ideal otto cycle with air as the working fluid has a compression ratio of 8. the minimum and maximum temperatures in the cycle are 300 k and 1340 k. use constant specific heats at room temperature to determine (a) the amount of heat transferred to the air during the heat- addition kj/kg, (b) the thermal efficiency, and (c) the thermal efficiency of a carnot cycle ope limits. process, in rating between the same temperature
Answers: 2
Aheat pump with r-134a as the working fluid is used to keep a space at 25°c by absorbing heat from s...
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