An inventor claims to have developed a power cycle operating between hot and cold reservoirs at 1175 K and 295 K, respectively, thatprovides a steady-state power output of (a) 27.27 kW, (b) 30.00 kW, while receiving energy by heat transfer from the hot reservoir atthe rate 150,000 kJ/h. Evaluate each claim.Part AWhat is the thermal efficiency for the conditions of case (a)? Is the inventor's claim possible for the conditions of case (a)?

Calculate the thermal efficiency of the Carnot engine operating between the given reserviors.…

Answered: An inventor claims to have developed a…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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As shown in the figure below, a reversible power cycle receives energy QH by heat transfer from a hot reservoir at TH and rejects energy Qc by heat transfer to a cold reservoir at Tc. Hot reservoir at TH Boundary- Cold reservoir 20 at Te (a) If TH = 1100 Kand Tc = 400 K, what is the thermal efficiency? (b) If TH = 500°C, Tc= 20°C, and Weycle = 1800 kJ, what are QH and Qc, each in kJ? (c) If n = 70% and Tc= 40°F, what is TH, in °F? (d) If n = 40% and TH = 1027°C, what is Tc, in °C?
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%
Thermodynamics fill in the blank: 1) Among the principal irreversiblilities of a gas turbine power plant, the most significant source of irreversibility by far is ______________. 2) Cooling a gas as it is compressed would reduce the work input required during compression, but achieving a heat transfer rate high enough to effect a significant reduction in work is difficult to achieve in practice. A practical alternative is to introduce multiple stages of compression with heat exchangers called _______________ between the stages.
At steady state, a power cycle develops a net power output of 20kW while receiving energy by heat transfer at a rate of 20kJ per cycle of operation from a source at a temperature T. The cycle rejects energy by heat transfer to cooling water at a lower temperature of 540 K. If there are 190 (engine thermodynamic) cycles per minute, what is the minimum theoretical value for T, in K?Note: mm is the last
Need help with this engineering problem. Make sure you circle the answers. For each cycle determine: (a) the net power developed per unit mass of steam flowing for the Rankine and Carnot cycle, in kJ/kg. (b) the percent thermal efficiency for the Rankine and Carnot.
Problem 2 Calculate the thermal efficiency or coefficient of performance of following cycles, and determine if the cycles are reversible, irreversible, or impossible. (a) A steam power cycle that receives heat input 1000 kJ while producing a network output 550 kJ, when interacting with two thermal reservoirs at temperatures of 700°C and 20°C. (b) A refrigeration cycle that needs 10 kJ work input to remove heat of 120 kJ to cool a room when interacting with two the inside and outside temperatures are at 20°C and 45°C.
Choose the CORRECT relation between the Coefficient of Performance (CoP) for Refrigerator and Heat Pump? Select one: (CoP)Refrigerator = (CoP)Heat Pump + 1 o (CoP)Heat Pump = (CoP)Refrigerator + 1 o (CoP)Refrigerator + (CoP)Heat Pump o (CoP)Refrigerator = (CoP)Heat Pump 1 o (CoP) Refrigerator – (CoP) Heat Pump Clear my choice
(A) the net heat energy absorbed during a cyclic process (the difference between heat flowing into the system and heat leaving the system) is the work. If we regard the atmosphere as a heat engine, what is the work being done by the atmosphere? That is, what phenomenon or phenomena are a realization of the work being done by the atmosphere? (B) Of all possible heat engines, the Carnot cycle has the maximum efficiency between any two operating temperatures (think of these temperatures as the maximum and minimum temperatures encountered during the cycle). Estimate the Carnot efficiency of Earth's atmosphere. [Hint: Think about the temperature variation with latitude.] (C) Do you think the efficiency of the real atmosphere would be "close" or "far" from the Carnot efficiency? Please explain your answer.
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.
The thermal efficiency of a reversible power cycle operating between hot and cold reservoirs is 40%. Evaluate the coefficient of performance of: (a) a reversible refrigeration cycle operating between the same two reservoirs. (b) a reversible heat pump cycle operating between the same two reservoirs.

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