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Applying the Energy BalanceWater, initially saturated
Chapter 3, Problem 47P(choose chapter or problem)
Water, initially saturated vapor at 4 bar, fills a closed, rigid container. The water is heated until its temperature is \(400^{\circ} \mathrm{C}\). For the water, determine the heat transfer, in \(\mathrm{kJ} / \mathrm{kg}\). Kinetic and potential energy effects can be ignored.
Questions & Answers
QUESTION:
Water, initially saturated vapor at 4 bar, fills a closed, rigid container. The water is heated until its temperature is \(400^{\circ} \mathrm{C}\). For the water, determine the heat transfer, in \(\mathrm{kJ} / \mathrm{kg}\). Kinetic and potential energy effects can be ignored.
ANSWER:Step 1 of 3:
Water is kept inside a rigid container with the initial pressure 4 bar. It is heated till it reaches 400°C. The initial condition of the water is saturated vapor. We are going to find the heat transfer in terms of kJ/kg.
From the Table A-3
The temperature of the water at 4 bar T1 = 143.5°C
The internal energy of the system at 4 bar U1 = 2553.6 kJ/kg
The final temperature T2 = 400°C (as given)