1. A piston-cylinder arrangement with stops (shown in the figure below) contains

Question

1. A piston-cylinder arrangement with stops (shown in the figure below) contains 5 kg of water. Heat is added to the cylinder, bringing it from State 1 to State 3. In State 1. the water is at a temperature of 100 degreeC and a pressure of 250 kPa. Heat is then added to the system until the piston lust touches the stops. at which point the water is a saturated vapour (State 2). More heat is added to the system until its pressure reaches 600 kPa (State 3). (a) What is the specific internal energy of the water in Stale 3 (in kJ/kg)? (b) Draw the entire process (with States 1,2 and 3 dearly marked with respect to saturation lines) on P-v and T-v diagrams. (e) Calculate the total amount of heal 1Q3 (in MJ) that must be added to the system for the whole process.

Explanation / Answer

Specific internal energy (u) of a substance is its internal energy per unit mass. It equals to the total internal energy (U) divided by total mass (m) as,

u = U / m

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