Chapter 7, Problem 7.1P

This is a Thermodynamics question. Please explain nicely. Considering variable specific heats, find the entropy change of a piston cylinder assembly containing airas an ideal gas and going through the following process:   V1=1m3T1=27 C V2=1.7m3T2= 327 C

4.27 A 400-L tank, A (see Fig. P4.27) contains argon gas at 250 kPa, 30°C. Cylinder B, having a frictionless piston of such mass that a pressure of 150 kPa will float it, is initially empty. The valve is opened and argon flows into B and eventually reaches a uniform state of 150 kPa, 30°C throughout. What is the work done by the argon? Po 8 Argon A FIGURE P4.27 B

Q2) A piston-cylinder device contains air at initially 1.5 bar and 25°C, The air is first compressed Polytropically to 7 bar, 0.05 m³ with Polytropic exponent of 1.4 then expanded isothermally to the initial pressure, and finally compressed Isobarically to the initial state. Draw the PV diagram of the cycle and then determine: 1. II. The boundary work of the entire cycle (W). Is this a practical cycle? Internal energy change (AU) during the polytropic process. Heat lost or gained (Q) during the isobaric process. III.

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Thermodynamics question. Please explain every step(schematic, analysis, assumptions, etc.) Thanks

Where did you get the value of entropy for state 1?

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ygotins lo 6.69) By injecting liquid water into superheated steam. the desuperheater shown in Fig. P6.69 has a saturated vapor stream at its exit. Steady-state operating data are provided in the accompanying table. Stray heat transfer and all kinetic neand potential energy effects are negligible. (a) Locate states to 1, 2, and 3 on a sketch of the T-s diagram. (b) Determine the rate of entropy production within the de-superheater, K.Modelthe in kW/K. ideal as State p(MPa) T°C) ) v × 10³(m³/kg) u(kJ/kg) h(kJ/kg) s(kJ/kg · K) 1 38 1.0065 X 10-3 166.5 168.3 0.5658 1B 0.1308 320 sat. vap. Y2807.9 3069.5 6.8452 3 1.5 1.159 2519.7 2693.6 7.2233 Desuperheater bol Liquid बेे कत 60°C. Det heet ni water 3. Saturated fos vapor P6.4recom O lo lguons 2 Superheated- vapor honor m2 = 0.03 kg/s motava bogisins odt 1ol,nW ni

Q5) Explain the "burst potatoes in the boiling water" with thermodynamic viewpoint.