Elements Of Electromagnetics
7th Edition
ISBN: 9780190698614
Author: Sadiku, Matthew N. O.
Publisher: Oxford University Press
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- a) An engineer proposed a design of cyclical engine that operates at the energy source whose temperature is 550 K and a sink at 300 K that generates waste heat. In the design proposal, it has been claimed that the cyclical engine can produces 5 kW while rejecting heat at a rate of 15000 kJ/h. Evaluate if the design proposal is valid. Justify your answer with related calculation.arrow_forwardQ3/ A heat pump cycle operating between two reservoirs receives energy Q2 from a cold reservoir at T2 = 250K and rejects energy Qı to a hot reservoir at T1 = 300K. For each of the following cases determine whether the cycle operates reversibly, irreversibly or is impossible. (a) Q2 =300KJ , W = 400 KJ (b) Q2 = 2000KJ , Q1 = 2200KJ (c) Q1 = 3000KJ , W= 500KJ (d) W = 400 KJ , COP =6 %3Darrow_forwardProblem 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.arrow_forward
- 4. What is the second law of thermodynamics, give its Clausius and Kelvin-Planck statements and justify on their basis why a perpetual motion machines that extracts heat from ambient environment to do work is not feasible. What is difference between reversible and an internally reversible process, and why are most actual processes considered irreversible. Numerical:arrow_forward(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.arrow_forward
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