The following observations were recorded during a boiler trial of 1 hr duration. 700 kg of coal of calorific value 30,000 kJ/kg is used to produce 5,250 kg of steam at a pressure of 12 bar. Dryness fraction of steam is 94%. Temperature of steam leaving the superheater is 250°C and temperature of hot well is 45°C. Calculate: (i) Equivalent evaporation. (ii) Thermal efficiency of boiler.
The following observations were recorded during a boiler trial of 1 hr duration. 700 kg of coal of calorific value 30,000 kJ/kg is used to produce 5,250 kg of steam at a pressure of 12 bar. Dryness fraction of steam is 94%. Temperature of steam leaving the superheater is 250°C and temperature of hot well is 45°C. Calculate: (i) Equivalent evaporation. (ii) Thermal efficiency of boiler.
Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)
8th Edition
ISBN:9781305387102
Author:Kreith, Frank; Manglik, Raj M.
Publisher:Kreith, Frank; Manglik, Raj M.
Chapter9: Heat Transfer With Phase Change
Section: Chapter Questions
Problem 9.28P
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