6 In a boiler test, the following observations wcre made:358A Text Book of Thermal EngineeringFeed water temperaturçe=12" C; Pressure of steam = 11 bar; Dryness fraction of steam 095Mass of coal burnt 300 kg/h, Calorific value of coal 32 000 kJkg of coal; Mass of water supplied to boilerin 7 hrs 14 min= 14 625 kg.The mass of w ster in the boiler at the end of the test was less than that at the commencement by900kg. Calculate I. Actual evaporation per kg of coal: 2 Equivalent evaporation from and at 100 C per kg[Ans. 7 15 kg, 8 33 kg: 58.75 %of coal ; and 3. Thermal efficiency of the boiler

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358 A Text Book of Thermal Engineering Feed water temperaturç 12° C; Pressure of steam = 11 bar; Dryness fraction of steam - 0.95: Mass of coal burnt 300 kg/h , Calorific value of coal 32 000 kJ/kg of coal : Mass of water suppiied to boiler in 7 hrs 14 min 14 625 kg. %3D The mass ofw ster in the boiler at the end of the test was less than that at the commence ment by 900 kg. Calculate:L. Actual evaporation per kg of coal: 2. Equivalent evaporation from and at 100 C per kg [Ans. 7.15 kg; 8.33 kg: 58.75 %) of coal ; and 3. Thermal efficiency of the boiler.

358 A Text Book of Thermal Engineering Feed water temperaturç 12° C; Pressure of steam = 11 bar; Dryness fraction of steam - 0.95: Mass of coal burnt 300 kg/h , Calorific value of coal 32 000 kJ/kg of coal : Mass of water suppiied to boiler in 7 hrs 14 min 14 625 kg. %3D The mass ofw ster in the boiler at the end of the test was less than that at the commence ment by 900 kg. Calculate:L. Actual evaporation per kg of coal: 2. Equivalent evaporation from and at 100 C per kg [Ans. 7.15 kg; 8.33 kg: 58.75 %) of coal ; and 3. Thermal efficiency of the 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 9.4DP

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