Chapter 5, Problem 5.23P

Thermodynamics subject power cycles. Show the ts diagram and complete and step by step solution. Bix the final answer.

Three sub steps of a thermodynamic cycle are employed in order to change the state of a gas from 1 bar, 1.5 cubic meter and internal energy of 512 kJ. The processes are: 1st step: Compression at constant PV to a pressure of 2 bar and internal energy of 690 kJ. 2nd step: A process where work transferred is zero and heat transferred is - 150 kJ. 3rd step: A process where work transferred is -50 kJ. without KE and PE changes, determine: a. heat transferred during 1st step (kJ) b. heat transferred during 3rd step (kJ)

The following processes occur in a reversible thermodynamic cycle: 1-2: 0.2 kg heating at constant pressure 1.05 bar at specific volume 0.1 m3/kg and work done -515 J. 2-3: Isothermal compression to 4.2 bar. 3-4: Expansion according to law pv1./= constant. 4-1: heating at constant volume back to the initial conditions. Using file 3, which figure number is associated the process? ?

2. A power cycle receives energy QH by heat transfer from a hot reservoir at TH = 1200 R and rejects energy QC by heat transfer to a cold reservoir at TC = 400 R. For each of the following cases, determine whether the cycle operates reversibly, operates irreversibly, or is impossible. (a) QH = 900 Btu, Wcycle = 450 Btu (b) QH = 900 Btu, QC = 300 Btu (c) Wcycle = 600 Btu, QC = 400 Btu (d) Eff. = 70%

10. A thermodynamic cycle using water is shown on the T-s diagram of Figure 7.26. Calculate the coefficient of performance for this cycle using the equation h, – h, COP = (h, – he) – (h, – hɔ) State A State B State C State D X = 1.00 P = 300. psia X = 0.00 Po = 10.0 psia P = 10.0 psia The processes are A → B = isentropic compression, B → C = isobaric expansion, C →D= isentropic expansion, D - A = isothermal compression. FIGURE 7.26

This Concepts revolves around thermodynamics and this practice example may need a PV diagram Directions are below

Thermodynamics I

Referring to the reversible heat pump cycle shown in the figure, p1 = 14.7 Ibf/in?, p4 = 27.8 lbf/in?, v1 = 12.6 ft³/Ib, v4 = 8.0 ft³/lb, and the gas is air obeying the ideal gas model. P4 pi TH V4 VI Determine TH, in °R, and the coefficient of performance. Step 1 Determine TH, in °R. TH = °R Save for Later Attempts: 0 of 1 used Submit Answer Step 2 The parts of this question must be completed in order. This part will be available when you complete the part above.

Find the mean effective pressure of the thermodynamic cycle shown in the figure below.