ALL ARE FOUND PER UNIT MASS.
HENCE ALL ARE SPECIFIC QUANTITIES.
OF INTERNAL ENERGY, ENTHALPY AND ENTROPY, I HAVE USED DIRECT FORMULAE WHICH ARE ALREADY DERIVED FOR DIFFERENT PROCESS.
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2.45 Hydrogen is compressed in a cylinder from 101 kPa and 15°C to 5.5 MPa and...
Air in a piston-cylinder device is compressed from 27°C and 100 kPa to 900 kPa by following a process with Pv14-const. If air is considered as ideal gas, please determine: (1) The air temperature after compression, (2) The heat transfer into or out of the system
13. a)Air is expanded from 1 MPa, 327°C to 200 kPa in a closed piston-cylinder device executing a PV1.2 = constant process. Determine the work produced during this process (8pts)
A piston-cylinder contains 1.8 kg of carbon dioxide at 190°C and 1.7 MPa. It is compressed t<o 3.4 MPa through a polytropic process whereP「--const. Determine the final temperature treating the carbon dioxide as (a) an ideal gas T2 and (b) a ver der Waals gas.
Air is compressed isentropically from 100 kPa and 27°C to 2550 kPa in a piston-cylinder device. Determine its final temperature using exact analysis A. Close to 740 °C B. Close to 467 °C C. 483.81 °C D. 68.14 °C
15. An 8-L cylinder contains air at 300 kPa and 300 K. Now air is compressed isothermally to a volume of 2 L. The work done on air during this compression process is: (b) 1.8 kJ (c) 3.3 kJ (a) 119 kJ (d) 4.5 kJ
Argon is compressed in a polytropic process with n = 1.2 from 170 kPa and 30°C to 110 kPa in a piston-cylinder device. Determine the final specific volume in m /kg of argon.
Problem #4 Carbon dioxide is compressed adiabatically in a piston – cylinder arrangement form 500 kPa and 310 K to 2.5 MPa. What is the minimum work required for the compression process if the initial volume is 0.04 m3 . Consider carbon dioxide as ideal gas with: a) constant specific heat. b) Variable specific heat.
Argon is compressed in a polytropic process with n= 1 from 120 kPa and 10°C to 600 kPa in a piston–cylinder device. Determine the work produced and heat transferred during this compression process, in kJ/kg. For Argon, R is 0.2081 KJ/kg K, Cv =0.3122 KJ/kg K
(6). (12 points) A piston-cylinder device contains 0.25 kg of air initially at 1.8 MPa and 360 °C. The air is first expanded isothermally to 400 kPa, then compressed polytropically, with a polytropic exponent of 1.2 to the initial pressure, and finally compressed at the constant pressure to the initial state. Pease find: (a) (3p) The boundary work for the isothermal expansion process. (b) (3p) The boundary work for the polytropic compression process. (c) (3p)The boundary work for the constant...
Humid air at 101 kPa, 25°C, 90% relative humidity is compressed in a steady-flow, isentropic compressor to 800 kPa. (a) What is specific humidity of the air? (b) What is the relative humidity of the air exiting the compressor? (c) What is the change in enthalpy of the dry air during this process? (d) What is the change in enthalpy of the water vapor, per unit dry air, during this process? Express your answer in kilojoules per kilogram of dry...