4. An air compressor is supplied with air at 101.3 kPa and a specific volume of 0.804 m3/kg. The air is discharged at 700 kPa and a specific volume of 0.162 m³/kg. Th initial and final internal energies are 37.2 kJ/kg and 114 kJ/kg respectively. The cooling water removes 88.0 kJ/kg of air compressed. The change in kinetic and potential energy may be neglected. Calculate (a) the specific work required, (b) t power required given a mass flow rate of 45.6 kg/min. Also (c) if the heat being rejected is transferred to cooling water flowing through a coil, and the cooling w forcing that cooling flow has a 100

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Equation !
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Steady-Flow Energy Equation II
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1. A boiler feedpump receives 10 °C water at a pressure of 500 kPa. The discharge
pressure is 2 400 kPa. Given a pump capacity of 160 000 kg/h, and after correcting
for the temperature of the water, what is the power supplied to the water? (84.5 kW)
2. Water is supplied to a pump at a pressure of 200 kPa. The power transferred to the
water is estimated to be 30 kW. The pump discharge pressure is 2 200 kPa and the
specific volume is 0.00106 m3/kg. Estimate the amount of water pumped in cubic
meters per min. (0.90 m3/min.)
I
3. Air enters a compressor with a velocity of 6.0 m/s and an enthalpy of 233 kJ/kg and
leaves with a velocity of 12 m/s and an enthalpy of 477 kJ/kg. Assuming adiabatic
compression and negligible change in potential energy, calculate the work required to
compress 1.0 kg of air. (244 kJ/kg)
4. An air compressor is supplied with air at 101.3 kPa and a specific volume of 0.804
m3/kg. The air is discharged at 700 kPa and a specific volume of 0.162 m³/kg. The
initial and final internal energies are 37.2 kJ/kg and 114 kJ/kg respectively. The
cooling water removes 88.0 kJ/kg of air compressed. The change in kinetic and
potential energy may be neglected. Calculate (a) the specific work required, (b) the
power required given a mass flow rate of 45.6 kg/min. Also (c) if the heat being
coil, and the cooling water
rejected is transferred to cooling water flowing through
picks up 10ºC across that coil, and the pump forcing that cooling flow has a 100 kPa
AP across it, calculate the power required to drive the cooling water pump (197 kJ/kg,
150 kW, 160 W)
5. Wet steam is throttled from 1000 kPa to 10 kPa and 130 °C. Find the dryness fraction
at state 1. [98.3%]
6. Steam enters a pressure reducing valve at a pressure of 2000 kPa, dry saturated. It is
throttled adiabatically to 100 kPa. What is the temperature and internal energy of th
162 °C 2600 4W/kg)
Transcribed Image Text:Equation ! ailings Review View Help Unless you need to edit, it's safer to stay in Protected View. Steady-Flow Energy Equation II Enable Editing 1. A boiler feedpump receives 10 °C water at a pressure of 500 kPa. The discharge pressure is 2 400 kPa. Given a pump capacity of 160 000 kg/h, and after correcting for the temperature of the water, what is the power supplied to the water? (84.5 kW) 2. Water is supplied to a pump at a pressure of 200 kPa. The power transferred to the water is estimated to be 30 kW. The pump discharge pressure is 2 200 kPa and the specific volume is 0.00106 m3/kg. Estimate the amount of water pumped in cubic meters per min. (0.90 m3/min.) I 3. Air enters a compressor with a velocity of 6.0 m/s and an enthalpy of 233 kJ/kg and leaves with a velocity of 12 m/s and an enthalpy of 477 kJ/kg. Assuming adiabatic compression and negligible change in potential energy, calculate the work required to compress 1.0 kg of air. (244 kJ/kg) 4. An air compressor is supplied with air at 101.3 kPa and a specific volume of 0.804 m3/kg. The air is discharged at 700 kPa and a specific volume of 0.162 m³/kg. The initial and final internal energies are 37.2 kJ/kg and 114 kJ/kg respectively. The cooling water removes 88.0 kJ/kg of air compressed. The change in kinetic and potential energy may be neglected. Calculate (a) the specific work required, (b) the power required given a mass flow rate of 45.6 kg/min. Also (c) if the heat being coil, and the cooling water rejected is transferred to cooling water flowing through picks up 10ºC across that coil, and the pump forcing that cooling flow has a 100 kPa AP across it, calculate the power required to drive the cooling water pump (197 kJ/kg, 150 kW, 160 W) 5. Wet steam is throttled from 1000 kPa to 10 kPa and 130 °C. Find the dryness fraction at state 1. [98.3%] 6. Steam enters a pressure reducing valve at a pressure of 2000 kPa, dry saturated. It is throttled adiabatically to 100 kPa. What is the temperature and internal energy of th 162 °C 2600 4W/kg)
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