# Assignment 2b due date Monday 20th of November.docx -...

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Problem 5: Closed systems A piston cylinder arrangement has a gas in the cylinder space. During a constant expansion to a larger volume the work effect for the gas is 1.6 kJ, the heat added to the gas and cylinder arrangement is 3.2 kJ, and friction between the piston and cylinder wall amounts to 0.24 kJ. Determine the change in internal energy of the entire apparatus (gas, cylinder, piston). ( Ans. 1.84 kJ ) Engineering Thermodynamics

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Problem 6: Steady-Flow Systems 12 kg of a fluid per minute goes through a reversible steady flow process. The properties of fluid at the inlet are p 1 =1.4 bar, 1 =25 kg/m 3 , C 1 =120 m/s, and u 1 =920 kJ/kg and at the exit are p 2 =5.6 bar, 2 =5 kg/m 3 , C 2 =180 m/s, and u 2 =720 kJ/kg. During the passage, the fluid rejects 60 kJ/s and rises through 60 meters. Determine; (i) The change in enthalpy ( h) and (ii) Work done during the process (W) ( Ans. Δh=-93.6 kJ/kg, W=-44.2 kW ) Engineering Thermodynamics
Problem 7: Steady-Flow Systems In a steam power plant 1.5 kg of water is supplied per second to the boiler.

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