Fundamentals of Heat and Mass Transfer
7th Edition
ISBN: 9780470501979
Author: Frank P. Incropera, David P. DeWitt, Theodore L. Bergman, Adrienne S. Lavine
Publisher: Wiley, John & Sons, Incorporated
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Textbook Question
Chapter 11, Problem 11.77P
Consider a Rankine cycle with saturated steam leaving the boiler at a pressure of 2 MPa and a condenser pressure of 10 kPa.
(a) Calculate the thermal efficiency of the ideal Rankine cycle for these operating conditions.
(b) It the net reversible work for the cycle is 0.5 MW, calculate the required flow rate of cooling watersupplied to the condenser at 15°C with an allowable temperature rise of 10°C.
(e) Design a shell-and-tube heat exchanger (one-shell, multiple-tube passes) that will meet the heat rateand temperature conditions required of the condenser. Your design should specify the number oftubes and their diameter and length.
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Students have asked these similar questions
A. Calculate the thermal efficiency of a Rankine cycle in which the steam
is initially dry saturated at 2 Mpa and the condenser pressure 7kN/m2
.
Express this efficiency as a percentage of a Carnot cycle efficiency of the
same limits of temperature.
B. If the steam leaves the boiler at 3500C with the same pressure of the
boiler and condenser given above. Explain why the Rankine efficiency
in (A) is less than in (B), and why the ratio of efficiencies of the
respective Rankine and Carnot is grater. Ans [ 88.3%, 49.9%]
A. Calculate the thermal efficiency of a Rankine cycle in which the steam is initially dry saturated at 2 Mpa and the condenser pressure 7kN/m². Express this efficiency as a percentage of a Carnot cycle efficiency of the same limits of temperature.
B. If the steam leaves the boiler at 350°C with the same pressure of the boiler and condenser given above. Explain why the Rankine efficiency in (A) is less than in (B), and why the ratio of efficiencies of the
respective Rankine and Carnot is grater.
A straight-condensing 10,500 kW turbine has a guaranteed steam rate of 6 kg/kW.hr when exhausting at 5.0 kPa. Exhaust steam enters the condenser at 90% quality, and it is estimated that fouling will decrease the overall coefficient by 30% during operation. Cooling water is available at 20 ℃, and for design purposes, 1 ½ in OD 17 BWG Brass tubes (thickness = 0.070 in, k=65 BTU/hrftF°.) are specified with 12 C° rise in cooling water, which circulates at 6 ft/s. Inside and outside film coefficients are hi=970 and ho=1478 BTU/hrft2F°. Design a condenser for this turbine, considering tube and boundary resistance as flat surfaces and neglecting any crossflow factor. Determine: a) Effective overall coefficient of heat transfer b) Volume flow rate of cooling water
Chapter 11 Solutions
Fundamentals of Heat and Mass Transfer
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