(#7ppVI-14Prm) - A steam plant operating with an initial pressure of 1.70 MPa and 370 C temperature and exhaust to a heating system at 0.17 MPa. The condensate from the heating system is returned to the boiler at 65.5 C and the heating system utilizes from its intended purpose 90% of the energy transferred from the steam it receives. The turbine efficiency is 70 %. If the boiler efficiency is 80%, what is the cogeneration efficiency of the system in percent. Neglect pumpwork. Steam Properties: At 1.7 MPa and 370 C h = 3187.1 kJ/kg s = 7.1081 kJ/kg At 65 C h₁ = 274.14 kJ/kg At 1.7 MPa h = 483.20 kJ/kg hfg =2216.0 kJ/kg SĘ = 1.4752 kJ/kg Sfg = 5.7062 kJ/kg-K

(#7ppVI-14Prm) - A steam plant operating with an initial pressure of 1.70 MPa and 370 C temperature and exhaust to a heating system at 0.17 MPa. The condensate from the heating system is returned to the boiler at 65.5 C and the heating system utilizes from its intended purpose 90% of the energy transferred from the steam it receives. The turbine efficiency is 70 %. If the boiler efficiency is 80%, what is the cogeneration efficiency of the system in percent. Neglect pumpwork. Steam Properties: At 1.7 MPa and 370 C h = 3187.1 kJ/kg s = 7.1081 kJ/kg At 65 C h₁ = 274.14 kJ/kg At 1.7 MPa h = 483.20 kJ/kg hfg =2216.0 kJ/kg SĘ = 1.4752 kJ/kg Sfg = 5.7062 kJ/kg-K

Refrigeration and Air Conditioning Technology (MindTap Course List)

8th Edition

ISBN:9781305578296

Author:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Publisher:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Chapter22: Condensers

Section: Chapter Questions

Problem 7RQ: When a standard-efficiency air-cooled condenser is used, the condensing refrigerant will normally be...

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