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Reviewing ConceptsAnswer the following true or
Chapter 3, Problem 147P(choose chapter or problem)
Answer the following true or false. Explain.
(a) If water, initially a superheated vapor at \(30 \mathrm{MPa}\), is cooled at constant pressure, the water eventually will become saturated vapor, and then with sufficient additional cooling condensation to saturated liquid will occur.
(b) A quasi equilibrium process for which the pressure volume relation is described by \(p / V^n=\) constant, where n is a constant, is called a polytropic process.
(c) For simple compressible systems, the state principle indicates that the number of independent intensive thermodynamic properties required to fix an intensive state is two.
(d) For ammonia at \(0.45 \mathrm{MPa}\) and \(50^{\circ} \mathrm{C}\), the specific enthalpy is \(1564.32 \mathrm{~kJ} / \mathrm{kg}\).
(e) For gases modeled as ideal gases, the value of the specific heat ratio \(c_v / c_p\) is greater than 1 .
Questions & Answers
QUESTION:
Answer the following true or false. Explain.
(a) If water, initially a superheated vapor at \(30 \mathrm{MPa}\), is cooled at constant pressure, the water eventually will become saturated vapor, and then with sufficient additional cooling condensation to saturated liquid will occur.
(b) A quasi equilibrium process for which the pressure volume relation is described by \(p / V^n=\) constant, where n is a constant, is called a polytropic process.
(c) For simple compressible systems, the state principle indicates that the number of independent intensive thermodynamic properties required to fix an intensive state is two.
(d) For ammonia at \(0.45 \mathrm{MPa}\) and \(50^{\circ} \mathrm{C}\), the specific enthalpy is \(1564.32 \mathrm{~kJ} / \mathrm{kg}\).
(e) For gases modeled as ideal gases, the value of the specific heat ratio \(c_v / c_p\) is greater than 1 .
ANSWER:Solution 147P:
a)
This is true.
Since the water at this high pressure decreases its volume and temperature as it is cooled without changing the pressure. The critical point will play an important role here and it will become saturated liquid.
b)
This is false.