As shown in the figure below, a reversible power cycle receives energy QH by heat transfer from a hot reservoir at TH and rejectsenergy Qc by heat transfer to a cold reservoir at Tc.Hot reservoirat 7Boundary-WcycleCold reservoir Qcat Te(a) If TH = 1100 K and Tc = 400 K, what is the thermal efficiency?(b) If TH = 500°C, Tc = 20°C, and Weycle = 1000 kJ, what are QH and Qc, each in kJ?(c) If ŋ = 60% and Tc = 40°F, what is TH, in °F?(d) If 7 = 40% and TH = 1027°C, what is Tc, in °C?

Answered: Image /qna-images/answer/4f823684-5c00-40b7-a25b-02e26cbc9a9c.jpg

Answered: As shown in the figure below, a…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

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1. In a Carnot cycle operating on nitrogen, the heat supplied is 40 BTU and the adiabatic expansion ratio is 12.5. If the receiver temperature is 60F, determine; a. The thermal efficiency b. The work c. The heat rejected 2. There are developed 10hp by a Carnot engine between 1000F and 100F. Determine; a. The thermal efficiency b. The heat supplied per seconds c. The change in entropy each second during heat rejection
A 60 MW turbine-generator running at 3600 rpm receives steam at 4 MPa 450oC with a back pressure of 10 KPa. Engine efficiency is 78% and combined mechanical electrical efficiency is 95%. Steam properties are as follows: 4 MPa ,450oC : h = 3330.3 KJ/kg, s = 6.9363 KJ/kg-K; 10 KPa: hf = 191.83, hg = 2584.7, sf = 0.6493, sg = 8.1502. Determine the throttle steam requirement in kg/hr.
A steam-powered power plant works on the basic Rankine cycle.shown in the figure. Likewise, some of its thermodynamic states are summarized in the attached table.Knowing that the work per unit mass delivered to the pump is 3W4 = 2480 (J/kg], determinein SI units the following: a) The specific volume of water in state 4.b) The associated work per unit mass, developed in the Curbina.c) The associated heat per unit mass released by the water in the condenser.d) The efficiency of the cycle
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The Carnot engine operates on an ideal gas using the Carnot cycle shown in thefigure below. Using the first law of thermodynamics, we determine the thermalefficiency, specific heat impute (q), and work output (w) of each operating cycle,assuming that the internal energy does not change. (K =1.4 & R = 0.287 KJ / Kg. K)
6 A reversible power cycle R and an irreversible power cycle I te between the same two reservoirs. Each receives Qy from the hot reservoir. reversible cycle dev elops work Wy while the irreversible cycle develops work W, (a) Evaluate the rate of entropy generation o for cycle I in terms of Wy, Wg and the rature Te of the cold reservoir. (b) Demonstrate that ¢ must be positive.
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%
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Find the cycle entropy production and answer if it operates irreversibly, reverisbly, or impossibly. A system executes a power cycle while receiving 1000 kJ by heat transfer at a temperature of 500 K and discharging energy by heat transfer at 300 K. Determine the cycle entropy production if the cycle thermal efficiency is 25% in kJ / K. Enter the answer without units, but with a minus sign if applicable. This cycle operates irreversibly reversibly impossibly.
In a Rankine cycle, 9.1 kg/min of steam enters the turbine at 2.5 MPa saturated and leaves at 50 kPa. If the pump and turbine efficiency i s72.7% and 80.8% respectively. @2.5 MPa hf = 962.11 kJ/kg sf = 2.5547 kJ/kg hg = 2803.1 kJ/kg sg = 6.2575 kJ/kg-k @50 kPa sf = 1.0910 kJ/kgK hf = 340.49 vf = 1.03 L/kg sfg = 6.5029 kJ/kg-k hfg = 2305.4 Find the following: a.) Net work of the actual cycle in kJ/hr PS. Input your answers in 5 decimal places. Show your unit analysis. SUBJECT: Thermodynamics 2
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