Air is compressed in a reversible compressor with a power input = 15 kw. The compression...
Air is compressed in a reversible compressor with a power input = 15 kw. The compression process is isothermal at 25 oC as a result of heat transfer to the surroundings at 20 oC. The change in entropy of the air is?
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Air is compressed in a reversible compressor with a power input
= 15 kw. The compression...
Air is compressed by a 34.6 kW compressor from P1 to P2. The air temperature is...
Air is compressed by a 34.6 kW compressor from P1 to P2. The air temperature is maintained constant at 34°C during this process as a result of heat transfer to the surrounding medium at 15°C. Determine (a) the rate of entropy change of the air, (b) the rate of entropy change of the surroundings, and (c) the rate of entropy generation. State the assumptions made in solving this problem. To check your work, enter the rate of entropy generation, in...
Air is compressed by a 18.00-kW compressor from P1 to P2. The air temperature is maintained const...
Air is compressed by a 18.00-kW compressor from P1 to P2. The air temperature is maintained constant at 21°C during this process as a result of heat transfer to the surrounding medium at 10°C. Determine the rate of entropy change of the air. AS- kW/K (Round to five decimal places.)
Air is compressed by a 18.00-kW compressor from P1 to P2. The air temperature is maintained constant at 21°C during this process as a result of heat transfer to the...
Air is compressed steadily by a reversible compressor from an inlet state of 100 kPa and...
Air is compressed steadily by a reversible compressor from an inlet state of 100 kPa and 300 K to an exit pressure of 900 kPa. if the volume flow rate = 1 m/sec Determine: the compressor power (kW) for isentropic compression with k = 1.4 Choose... the compressor power (kW) for polytropic compression with n = 1.3 Choose.. the compressor power (kW) for ideal two stage compression with intercooling with a polytropic exponent of 1.3 Choose... the compressor power (kW)...
P1) (50 points) - Air is compressed steadily by a 7.5-kW compressor. Air enters a compressor...
P1) (50 points) - Air is compressed steadily by a 7.5-kW compressor. Air enters a compressor at a pressure of 100 kPa, a temperature of 290 K and a velocity of 6 m/s through an inlet with an area of 0.005 m2. At the exit, the pressure is 700 kPa, the temperature 480 K and the velocity is 2 m/s. Determine: a) heat transfer that takes place between the compressor and the surrounding medium at 290 K, in kW and...
Which of the following statements are true for a reversible adiabatic compressor (multiple answers are possible)...
Which of the following statements are true for a reversible adiabatic compressor (multiple answers are possible) O A. Entropy generation is zero B. The compressor is ideal and will consume minimal work OC. The compression process is isentropic OD. Heat may transfer from the compressor to the surroundings
Air at 108 kPa and 20 oC is compressed steadily by a 5.3 kW compressor to...
Air at 108 kPa and 20 oC is compressed steadily by a 5.3 kW compressor to 620 kPa and 170 oC . The mass flow rate of air is 1.55 kg/min. The surrounding temperature or the ambient temperature is 17 oC. Calculate the loss of available energy or exergy destroyed in kW. Assume Cp of air as 1.005 kJ/kg K and gas constant R as 0.287 kJ/kg K . Remember to change temperatures to the Kelvin scale. (Hint: Here entropy...
Air is compressed steadily by a reversible compressor from 100 kPa and 300 K to 900...
Air is compressed steadily by a reversible compressor from 100
kPa and 300 K to 900 kPa by a 10-kW motor. Assume air is both ideal
and has constant specific heat capacity values determined at room
temperature from Table A-2 at room temperature (300 K).
a) Determine the mass flow rate through the compressor if the
process is isentropic. ( find and identify the work per unit
mass)
b) polytropic with n = 1.2
c) isothermal
d) ideal two-stage polytropic...
The power input to the compressor of an ammonia vapor compression plant is 8.2 kW. The...
The power input to the compressor of an ammonia vapor compression plant is 8.2 kW. The mechanical efficiency is 85%. The ammonia is dry saturated vapor at -5oC at inlet to the compressor. After compression, the vapor is at 1000 kPa. The compressor has an isentropic efficiency of 90%. The condenser produces saturated liquid. Calculate the coefficient of performance for the refrigerator and for the heat pump for this plant.
1. Saturated R134a vapor enters the uninsulated compressor of a home central air- conditioning system at...
1. Saturated R134a vapor enters the uninsulated compressor of a home central air- conditioning system at 4 °C. The flow rate of R134a through the compressor is 0.1 kg/s, and the electrical power input is 5 kW. The exit state is 65 °C with 1000 kPa. Any heat transfer from the compressor is to the ambient environment at 27 °C. a) Determine the rate of entropy production for the process in kW/K. b) If the change in enthalpy for the...
3_4: Air from the surrounding atmosphere at 100 kPa, 20 oC, enters a compressor with a...
3_4: Air from the surrounding atmosphere at 100 kPa, 20 oC, enters a compressor with a velocity of 8.6 m/s through an inlet whose diameter is 36 cm. The compressed air exits at 650 kPa, 225 oC, with a velocity of 2.8 m/s. The rate of entropy generation for the compressor is 0.062 kW/K. Determine the power input to the compressor, kW.
Air is compressed by a 18.00-kW compressor from P1 to P2. The air temperature is maintained constant at 21°C during this process as a result of heat transfer to the surrounding medium at 10°C. Determine the rate of entropy change of the air. AS- kW/K (Round to five decimal places.)
Air is compressed by a 18.00-kW compressor from P1 to P2. The air temperature is maintained constant at 21°C during this process as a result of heat transfer to the...
Air is compressed steadily by a reversible compressor from an inlet state of 100 kPa and 300 K to an exit pressure of 900 kPa. if the volume flow rate = 1 m/sec Determine: the compressor power (kW) for isentropic compression with k = 1.4 Choose... the compressor power (kW) for polytropic compression with n = 1.3 Choose.. the compressor power (kW) for ideal two stage compression with intercooling with a polytropic exponent of 1.3 Choose... the compressor power (kW)...
P1) (50 points) - Air is compressed steadily by a 7.5-kW compressor. Air enters a compressor at a pressure of 100 kPa, a temperature of 290 K and a velocity of 6 m/s through an inlet with an area of 0.005 m2. At the exit, the pressure is 700 kPa, the temperature 480 K and the velocity is 2 m/s. Determine: a) heat transfer that takes place between the compressor and the surrounding medium at 290 K, in kW and...
Which of the following statements are true for a reversible adiabatic compressor (multiple answers are possible) O A. Entropy generation is zero B. The compressor is ideal and will consume minimal work OC. The compression process is isentropic OD. Heat may transfer from the compressor to the surroundings
Air is compressed steadily by a reversible compressor from 100
kPa and 300 K to 900 kPa by a 10-kW motor. Assume air is both ideal
and has constant specific heat capacity values determined at room
temperature from Table A-2 at room temperature (300 K).
a) Determine the mass flow rate through the compressor if the
process is isentropic. ( find and identify the work per unit
mass)
b) polytropic with n = 1.2
c) isothermal
d) ideal two-stage polytropic...
1. Saturated R134a vapor enters the uninsulated compressor of a home central air- conditioning system at 4 °C. The flow rate of R134a through the compressor is 0.1 kg/s, and the electrical power input is 5 kW. The exit state is 65 °C with 1000 kPa. Any heat transfer from the compressor is to the ambient environment at 27 °C. a) Determine the rate of entropy production for the process in kW/K. b) If the change in enthalpy for the...
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