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Lec24

# Lec24 - maximum performance measures Sections 5.8-5.9...

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ME 200: Thermodynamics I Lecture 24: Temperature scales, maximum performance measures Sections 5.8-5.9 Problems: SP24; 5.50, 5.62 Professor Hukam Mongia Office Hours: MWF 2:30 to 3:30 pm in ME 83 (Other times email for appointment) Email: [email protected] Phone: 765-494-5640 Course Website: https://engineering.purdue.edu/ME200 Course Secretaries: Diana Akers (ME 84) and Marilyn Morrison (ME 100) See Kul Inn (ME 189) about grading Homework Assignments 10/18/2009 1

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Power Cycles h = W/ Q H = 1-Q C /Q H Coefficient of performance for a refrigeration cycle, b = Coefficient of performance for a heat pump cycle, g = Maximum values of h, b and g beyond the statements Q c >0 and W cycle >0
2 nd corollary of the 2 nd Law: All reversible power cycles operating between the same two thermal reservoirs have the same thermal efficiency. Assigned value of temperature at the triple point of water

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The Gas Thermometer Bath temp T = a p Bath at triple point of water: 273.16 = a p tp a =273.16/p tp T = 273.16 (p/p tp ) v T = 273.16 (p/p tp ) v→0 13.8033 K: H2 triple point 24.5561 K: Ne triple point 54.3584 K: O2 triple point 234.3156 K: Hg triple point 273.16 K: H2O triple point 1357.77 K: Copper freezing point

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Lec24 - maximum performance measures Sections 5.8-5.9...

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