26_Steam_Engine

26_Steam_Engine - INDIANA UNIVERSITY DEPARTMENT OF PHYSICS P309 LABORATORY Laboratory#26 Efficiency of Steam Engine and Electric Generator Goal

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INDIANA UNIVERSITY, DEPARTMENT OF PHYSICS, P309 LABORATORY Laboratory #26: Efficiency of Steam Engine and Electric Generator Goal: Experimental study of the conversions of heat to mechanical power and of mechanical power to electrical power. Methods to measure mechanical power. Efficiency of conversion. Equipment: Jensen steam engine, variac, AC power meter, Prony brake, stroboscope, variac, power meter, electric generator, variable resistor box. (A) Physics: Machines that convert heat to mechanical power operate between two temperature reservoirs at temperatures T 1 and T 2 . The efficiency of such a machine is the ratio of heat energy input to mechanical energy output. From the Second Law of Thermodynamics follows that the best possible efficiency η max is [FEY64] 1 2 1 max T T T = η . ( 1 ) For a steam engine, T 1 390K (steam under pressure), and T 2
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This note was uploaded on 01/20/2012 for the course P 309 taught by Professor Urheim during the Spring '11 term at Indiana.

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26_Steam_Engine - INDIANA UNIVERSITY DEPARTMENT OF PHYSICS P309 LABORATORY Laboratory#26 Efficiency of Steam Engine and Electric Generator Goal

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