FUND OF ENG THERMODYN(LLF)+WILEYPLUS
9th Edition
ISBN: 9781119391777
Author: MORAN
Publisher: WILEY
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0.05 kg of a certain gas in a piston and cylinder is compressed reversibly until the pressure reaches 0.615 MPa. The initial pressure and volume were 0.1025 MPa and 0.03 m3 respectively. Determine the final temperature, the work done on the gas, the heat flow to or from the cylinder walls. i) When the process is according to law PV1.4 = C, ii) When the process is isothermal. (the molecular weight of a certain gas is 44 and y = 1.3).
A rigid cylindrical tank stores 80 kg of a substance at 400 kPa and 480 K
while the outside temperature is 290 K. A paddle wheel stirs the system
transferring shaft work at a rate of 0.7 kW. At the same time an internal
electrical resistance heater transfers electricity at the rate of 1.6 kW.
A. Do an energy analysis to determine the rate of heat transfer for the tank.
B. Determine the absolute value of the rate at which entropy leaves the
internal system (at a uniform temperature of 480 K). Answer in kW/K
C. Determine the rate of entropy increase in the system's surroundings.
Answer in kW/K
Calculate the amount of work necessary for the reversible compression of steam from 1 bar to 10 bar. The compression is to take place in a cylinder fitted with a weightless piston at the constant temperature of 500 oC. Under these conditions we have a superheated vapor. Assume that steam may be treated as an ideal gas.
Report your answer in units of kJ/kg using three decimal places. For conversion, note that the molar mass of water is 18.015 g/mol.
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