FUNDAMENTALS OF THERMODYNAMICS
10th Edition
ISBN: 9781119634928
Author: Borgnakke
Publisher: WILEY
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5. A two-stage double-acting compressor is to deliver 90 lb/min
of air from 14.3 psia and 90°F to a final pressure of 185 psia.
The normal barometer is 29.8 in. Hg and the temperature is
80°F. The pressure drop in the intercooler is 3 psi and the
temperature of the air at the exit of the intercooler is 90°F, the
speed is 210 RPM and PV 1.34 C during compression and
expansion. The clearance is 5% for both cylinders. The
temperature of the cooling water increases by 18°F. Find (a)
volume of free air, (b) discharge pressure of LP cylinder for
minimum work, (c) temperature at discharge for both
cylinders, (d) mass of cooling water to be circulated about
each cylinder and through the intercooler, (e) the work of
compression, (f) if for LP cylinder, L/D 0.68 and if both
cylinders have the same stroke, what are the bore and stroke
for each cylinder?
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A small ramjet engine is to be designed for a maximum thrust of 1000 lb at sea level at a velocity of 950 ft/s. If the exit velocity and pressure are 2000 ft/s and 1.0 atm, respectively, how large should the inlet be?
For a turbocharged engine with a compressor efficiency of 59% what is the compressor outlet temperature (in degrees C) when running 30psi of boost on a standard temperature and pressure day? What is the temperature gain produced in the intake air by the turbocharger?
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- A turbo-charged, 16 cylinder, Vee-type diesel engine has an air consumption 0f 3,000 kg/hr per cylinder at rated load and speed. This air is drawn in through a filter by a centrifugal compressor directly connected to the exhaust gas turbine. The temperature of the air from the compressor is 145°C before it goes to the engine suction header. Cooling water enters air cooler at 30°C and leaves at 38°C. Calculate the Arithmetic Mean Temperature Difference (AMTD). Show your complete solution.arrow_forward4. A two-stage air compressor with an intercooler takes in air at 14.6 psia at 62 degree F anddelivers it at 502 psia. The temperature of the air leaving the intercooler is 62 degree F.Calculate the work required per pound of air delivered if compression isisentropic, ft-lbf/lbA. (-)108,072 ft-lbf/lb C. (-)168,072 ft-lbf/lbB. (-)118,072 ft-lbf/lb D. (-)128,072 ft-lbf/lbarrow_forwardnote : indicate also the digram .arrow_forward
- A turbocharged 6-cy, V-type diesel engine has an air consumption of 3000 kg/hr. per cylinder at rated load and speed. This air is drawn in through a filter by a centrifugal compressor directly connected to the exhaust gas turbine. The temperature of the air from the compressor is 145degC and a counterflow air cooler reduces the air temperature to 45degC before it goes to the engine suction header. Cooling water enters air cooler at 30degC and leaves at 38degC. Calculate the cooling water needed in m³/hr required to cool the total air requirement of the engine at rated load and speedarrow_forwardAir with a pressure of 0.1 MPa and a temperature of 25oC with a flow rate of 5.29 kg/minute enters a three-stage reciprocating piston compressor with intercooler. The air is compressed polytropically (n = 1.3) to reach the pressure of 4 MPa. Calculate: a) The amount of heat transferred to each intercooler? b) How much air is needed for cooling in the intercooler if the allowable maximum temperature changes between the inlet and outlet of the intercooler is 8oC?arrow_forwardRequired information Air enters the compressor of a regenerative gas turbine engine at 310 K and 100 kPa, where it is compressed to 900 kPa and 650 K. The regenerator has an effectiveness of 78 percent, and the air enters the turbine at 1400 K. Assume constant specific heats for air at room temperature. The properties of air at room temperature are cp = 1.005 kJ/kg-K and k= 1.4. For a turbine efficiency of 90 percent, determine the amount of heat transfer the regenerator. (You must provide an answer before moving on to the next part.) The amount of heat transfer in the regenerator is IkJ/kg.arrow_forward
- An ideal, adiabatic, air turbine produces 500 kW of power in steady-state operation. The air enters the turbine at 600 °C and 550 kPa and exits at a pressure of 100 kPa.a. Find the exit temperature. b. Find the mass flow rate.arrow_forwardA single-acting two-stage air compressor deals with 4 m³/min of air at 1.013 bar and 15°C with a speed of 250 rpm. The delivery pressure is 80 bar. Assuming complete intercooling, find the minimum power required by the compressor and the bore and stroke of the compressor. Assume a piston speed of 3 m/s, mechanical efficiency of 75% and volumetric efficiency of 80% per stage. Assume the polytropic index of compression in both the stages to be n = 1.25 and neglect clearance.arrow_forward10. An ideal single air compressor without clearance takes in air at 100 kPa with a temperature of 16°C and delivered it at 413 kPa after isentropic compression. What is the discharge work done in kJ/kg? (ME Board: April 1998)arrow_forward
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