Lecture 11 PES Su 2011 annotated

Lecture 11 PES Su 2011 annotated - ME 200: Thermodynamics I...

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ME 200: Thermodynamics I Lecture 11: Property Tables (Continued) Prof. Sojka Summer 2011
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2 In this Lecture … Property Tables (Continued)
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3 Enthalpy Enthalpy, H or h It’s a property . It’s a combination of internal energy ( u ) and potential energy associated work associated with flow ( P υ ). It has units of energy/mass (kJ/kg or Btu/lb m PV U
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4 Example 1 Determine the h of R 22 when T = 12 ºC and u = 144.58 kJ/kg. 5.0 77.58 38. 230 58. 144 = - x f g fg xh + 29 64. 194 35.59 kg kJ / 157
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5 Example 2 A piston-cylinder assembly contains 1 kg of water, initially occupying a volume of 0.5 m 3 at 1 bar. Energy transfer by heat to the water results in an expansion at constant temperature to a final volume of 1.694 m . Kinetic and potential energy effects are negligible. For the water, (a) show the process on a T- υ diagram, (b) evaluate work, in kJ, and (c) evaluate the heat transfer, in kJ. Given m = 1 kg of water V 1 = 0.5 m P = 1 bar T 2 = T = 1.694 m Find Show the process on a T- diagram. W = ? in kJ Q Sketch Assumptions
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Lecture 11 PES Su 2011 annotated - ME 200: Thermodynamics I...

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