ME200 - Lecture 12

ME200 - Lecture 12 - 9/25/2010 SpecificHeats...

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9/25/2010 1 Specific Heats Incompressible Substances ME 200 Thermodynamics Purdue University , Dr. Tim Pourpoint – [email protected] Thermodynamics I Lecture 12 September 20 th , 2010 Research supported by General Motors Last Week •P rope r t y Tables •De f ined enthalpy te rm ina t ion of u and h using the property tables • Application of First Law Energy Balance Using Property Table Data f ine quality (ratio of mass vapor to total mixture mass) ined ways to find state of a substance: CL, SL, SLVM SV SHV ME 200 2 SLVM, SV, SHV
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9/25/2010 2 •Spe c i f i c Heats •Fu r the r Discussion of Incompressible Substances Today ME 200 3 c i f i c heat is the energy required to raise the temperature of a unit mass of a pure substance by one degree Specific Heat • In thermodynamics, we consider two important specific heats –Con s tan t volume specific heat: describes change in temperature for process with no p d v work ME 200 4 – Constant pressure specific heat: describes change in temperature for process with p d v work
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9/25/2010 3 •Spe c i f i c Heat at Constant Volume ( c v ) Specific Heat (cont.) v v u c T    c v is related to change in internal energy per unit change in temperature at constant volume c i f i c Heat at Constant Pressure ( c p ) h ME 200 5 c p is related to change in enthalpy per unit change in temperature at constant pressure p p c T •S I Units: kJ/kg K or kJ/kg C – Equivalent since only change in temperature is relevant i.e. T(ºC) = T(K) – Molar Specific Heats: kJ kmo K or kJ kmo C Specific Heat (cont.) Molar Specific Heats: kJ/kmol K or kJ/kmol C •U SC S Units: Btu/lbm R or Btu/lbm F c
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This note was uploaded on 12/11/2011 for the course ME 200 taught by Professor Gal during the Fall '08 term at Purdue.

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ME200 - Lecture 12 - 9/25/2010 SpecificHeats...

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