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Lecture 12 PES Su 2011 annotated

Lecture 12 PES Su 2011 annotated - ME 200 Thermodynamics I...

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ME 200: Thermodynamics I Lecture 12: Specific Heats and Incompressible Substances Prof. Sojka Summer 2011
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2 In this Lecture … We will study: Specific Heats Incompressible Substances
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3 Specific Heats Specific heats used to be called heat capacities . Physical description : The increase in energy storage (heat) a body undergoes when its temperature rises by 1 degree. Particularly useful for thermodynamic calculations involving the ideal gas model. Units of kJ/kg-K, kJ/kg-ºC, Btu/lbm-ºF, and Btu/lbm-ºR.
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4 Specific Heats For a simple system, if the volume is constant if the pressure is constant W Q E - = υ υ T u c = U E Q = = E W Q + = p p T h c = H U V p Q = + =
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5 Specific Heats Specific heats They are properties. Although their definition comes from two different paths, they work for any process. Both du = c υ dT and dh = c p dT work for isobaric, isochoric, isenthalpic, isentropic, … c p > c υ Their ratio is also a property called
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