Problem 1Calculate the thermal efficiency or coefficient of performance of the following cycles, and determine ifthe cycles are reversible, irreversible, or impossible.(a) A steam power cycle that receives thermal energy at a rate of 800 kW from a thermal source at550°C and rejects thermal energy at a rate of 300 kW to a thermal sink at 50°C.(b) A heat pump that needs 10 kJ work input to deliver 120 kJ of thermal energy to a room at 27°C. Theheat pump interacts with a low temperature reservoir at 5°C.

(a) For steam power cycle:Heat input = Heat rejection = Temperature of hot reservoir = Temperature…

Answered: Problem 1 Calculate the thermal…

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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The thermal efficiency of a reversible power cycle operating between hot and cold reservoirs is 60%. 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. Part A Evaluate the coefficient of performance of a reversible refrigeration cycle operating between the same two reservoirs. B = i Save for Later Part R Attempts: 0 of 4 used Submit Answer
A proposed cyclic heat engine will accept 300 J of heat from a hot reservoir at 800 K, output 250 J of work to the surroundings, and reject 50 J of heat to a cold reservoir at 300 K. According to the 2nd law of thermodynamics, which of the following statements is correct? The system is possible but irreversible. The system is impossible. The system is possible and reversible.
A reversible power cycle whose thermal efficiency is 50% operates between a reservoir at 1800 K and a reservoir at a lower temperature T. Determine T, in K.
A closed system undergoes a cycle consisting of three process 1-2, 2-3 and 3-1. Given that Q12 = 30kJ, Q23 = 10 kJ, 1w2 = 5 kJ, 3w2 = 5 kJ and DE31 = 15 kJ, Evaluate Q31, w23, DE12 and DE23.
(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.
A four-stroke turbocharged V-16 diesel engine built by a car manufacturer company to power fast trains produces mechanical 3500 hp (2.609 MW) at 1200 rev/min. Determine the amount of work produced in kJ (a) per cylinder per mechanical cycle and (b) per cylinder per thermodynamic cycle.
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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