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A thermal power plat uses boiler which evaporates 3500 kg of water at 42.5° C into superheated steam at a pressure of 12.5 bar and 275º C. The boiler consumes 500 kg of coal per hour to produce steam. Assume the specific heat of superheated steam as 2.1 kJ/kgK and the calorific value of coal is 32760 kJ/kg. Determine equivalent evaporation "from and at 100° C" and thermal efficiency of the boiler. Use the following steamtable for required values:

A thermal power plat uses boiler which evaporates 3500 kg of water at 42.5° C into superheated steam at a pressure of 12.5 bar and 275º C. The boiler consumes 500 kg of coal per hour to produce steam. Assume the specific heat of superheated steam as 2.1 kJ/kgK and the calorific value of coal is 32760 kJ/kg. Determine equivalent evaporation "from and at 100° C" and thermal efficiency of the boiler. Use the following steamtable for required values:

Elements Of Electromagnetics
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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A thermal power plat uses boiler which evaporates 3500 kg of water at 42.5° C into superheated steam at a pressure of 12.5 bar and 275° C. The boiler consumes 500 kg of coal per hour to produce steam. Assume the specific heat of superheated steam as 2.1 kJ/kgK and the calorific value of coal is 32760 kJ/kg. Determine equivalent evaporation "from and at 100° C" and thermal efficiency of the boiler. Use the following steamtable for required values: Saturation Properties Temperature Table hf kJ/kg 171.63 hg kJ/kg 2576.2 hfg kJ/kg t °C bar 41 0.07777 2404.5 42 0.08198 175.81 2575.9 2402.1 43 0.08639 179.99 2590.1 2399.7 10 184.17 31.5 97.3 45 0.09582 188.35 2583.3 2394.9 Saturation Properties Pressure Table hf kJ/kg hg kJ/kg hfg kJ/kg 1998.5 t bar °C 11.0 184.07 781.12 2779.7 12.0 187.96 798.43 2782.7 1984.3 13.0 191.61 814.70 2785.4 1970.7 14.0 195.04 830.07 2788.9 1951.4 15.0 198.29 844.66 2789.9 1945.2
Transcribed Image Text:A thermal power plat uses boiler which evaporates 3500 kg of water at 42.5° C into superheated steam at a pressure of 12.5 bar and 275° C. The boiler consumes 500 kg of coal per hour to produce steam. Assume the specific heat of superheated steam as 2.1 kJ/kgK and the calorific value of coal is 32760 kJ/kg. Determine equivalent evaporation "from and at 100° C" and thermal efficiency of the boiler. Use the following steamtable for required values: Saturation Properties Temperature Table hf kJ/kg 171.63 hg kJ/kg 2576.2 hfg kJ/kg t °C bar 41 0.07777 2404.5 42 0.08198 175.81 2575.9 2402.1 43 0.08639 179.99 2590.1 2399.7 10 184.17 31.5 97.3 45 0.09582 188.35 2583.3 2394.9 Saturation Properties Pressure Table hf kJ/kg hg kJ/kg hfg kJ/kg 1998.5 t bar °C 11.0 184.07 781.12 2779.7 12.0 187.96 798.43 2782.7 1984.3 13.0 191.61 814.70 2785.4 1970.7 14.0 195.04 830.07 2788.9 1951.4 15.0 198.29 844.66 2789.9 1945.2
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