The data listed below are claimed for power cycles operating between hot and cold reservoirs at 1000 K and400 K, respectively. For each case determine whether such a cycle is in keeping with the first and second lawsthermodynamics.ofa. QH = 300 kJ, Wcycle = 160 kJ, Qc = 140 kJ.b. QH = 300 kJ, Wcycle = 180 kJ, Qc = 120 kJ.c. QH = 300 kJ, Wcycle = 170 kJ, Qc = 140 kJ.d. QH = 300 kJ, Wcycle = 200 kJ, Qc = 100 kJ.

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Answered: The data listed below are claimed for…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

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Hey! This is open space, remember to check your document properties and give all of your images alt text! power cycle receives QH by heat transfer from a hot reservoir at TH = 1200 K and rejects energy Qc by heat transfer to a cold reservoir at Tc = 400 K. For each of the following cases, determine whether the cycle operates reversibly, operates irreversibly, or is impossible. a. QH = 900 kJ, Wcycle = 450 kJ b. QH = 900 kJ, QC = 300 kJ c. Wcycle = 600 kJ, QC = 400 kJ d. n = 75%
Problem 1 A power cycle operating between two reservoirs receives energy Qn by heat transfer from a hot reservoir at TH 1888 K and rejects energy Oc by heat transfer to a cold reservoir at Tc=377 K. For each of the following cases determine whether the cycle operates reversibly, irreversibly, or does not verify the second aw of thermodynamics (make all necessary calculation for each case): %3D a) QH=1700 kJ and Wrcle = 1600 b) QH=702 kJ and Qc= 351 kJ c) =94 % d) QH=1700 kJ and Wcl= 1800 kl %3D %3D
The following are reasons why we use assumptions to represent reciprocating engines as closed system cycles, EXCEPT: a.All statementds are valid b.Reciprocating engines have equivalent thermal efficiencies as their corresponding cycles c.The shape and behavior of reciprocating engines are too complex d.The working fluid for reciprocating engines is an air-fuel mixture, which could be difficult to model
The data listed below are claimed for a power cycle operating between hot and cold reservoirs at 1200 K and 400 K, respectively. For each case, determine whether the cycle operates reversibly, operates irreversibly, or is impossible. a. Qh = 900 kJ, Weycle = 450 kJ b. Qu = 900 kJ, Qe = 300 kJ Weycle = 600 kJ, Q. = 400 kJ n= 75% 50% %3D 66.7% c. 60% %3D d.
Q.2 A Carnot engine operates with ideal gas, using the Carnot cycle shown in the following Figure. Using the first law of thermodynamics and assume no change of internal energy, determine the thermal efficiency, the specific heat impute (q), and the work output (w) for each cycle of operation. (K=1.4 & R=0.287 KJ/Kg. K) T = 220 C 77 kPa T = 20 C 12 m'/kg
The figure below is the basic plot of pressure vs. volume for the Dual Standard Cycle. Constant pressure heat addition 3 4 PV = constant Нeat IN Adiabatic expansion Heat OUT (Constant volume heat rejection) Constant volume heat addition 1 Adiabatic compression Volume (V) Using the Dual Air Standard Cycle and the following data: • Assume constant properties of air. R= 287 J/kgK; Cp = 1005 J/kgK; Cv = 718 J/kgK; y = 1.4 Cycle compression ratio = 11 (v1/v2) Air conditions prior to compression: Pressure = 1.6 bar; Temperature = 298K Heat added at constant volume = 290000 J/kg %3D Heat added at constant pressure = 579000 J/kg Pressure (P) 2]
1. Consider the following heat engines operating between 1200K and 300 K. For each case determine whether the heat engine operates reversibly, operates irreversibly, or is impossible. a. QH = 850 kJ, Qc = 300 kJ, Wnet = 550 kJ, %3| b. QH = 900 kJ, Qc = 400 kJ, Wnet = 550 kJ, %3D c. QH = 700 kJ, Qc = 140 kJ, Wnet = 560 kJ, d. QH = 800 kJ, Qc = 200 kJ, Wnet = 600 kJ.
Ts diagrams for two reversible thermodynamic power cycles are shown in the following fig- ure. Both cycles operate between a high temperature reservoir at 500 K and a low temperature reservoir at 300 K. The process on the left is the Carnot cycle described in Section 2.9. The process on the right is a Brayton cycle, which is similar to a Carnot cycle, except that the two steps (state 1 to state 2) and (state 3 to state 4) are at constant pressure. Which cycle, if either, has a greater efficiency? Explain.
4. Two and one-half pounds of air actuate a cycle composed of the following processes: polytropic compression 1-2, with n = volume 3-1. The known data are: D1 = 20 psia, ti = 100°F, Qr = -1682 Btu. Determine (a) T2 nd Ts, (b) the work of the cycle using the pV plane, in Btu; (c) Qu (d) the thermal 1.5; constant pressure 2-3; constant efficiency, and (e) pn. Ans. (a) 1120°R, 4485°R; (b) 384.4 Btu; (c) 2067 Btu; (d) 18.60%: (e) 106.8 psia
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
1. A Carnot power cycle operates on 2lb/min of air between the limits of 70F and 500 F. The pressure at the beginning of isothermal expansions is 400 psia and at the end of isothermal expansion 185.psig, determine; a. The volume at the end of the isothermal compression b. AS during an isothermal process c. Qa, Qr, Wnet d. Thermal efficiency e. The mean effective pressure.
1.) A reversible cycle executed by 1 mol of an ideal gas for which Cp = (5/2)R and Cv = (3/2)R consists of the following: • Starting at T1 = 700K and P1 = 1.5 bar, the gas is cooled at constant pressure to T2 = 350K • From 350K and 1.5 bar, the gas is compressed isothermally to pressure P2. • The gas returns to its initial state along a path for which PT=constant What is the thermal efficiency of the cycle?

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