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Unformatted text preview: ME 200: Thermodynamics I Lecture 3: Temperature, T, and Problem solving structure Prof. Sojka Summer 2011 In this Lecture Temperature Problem Solving structure 2 3 Temperature Zero th Law of Thermodynamics When two objects are in thermal equilibrium with a third object, they are in thermal equilibrium with one another. Properties of many substances change with temperature. 4 Temperature Scales Scale Kelvin (SI) Rankine (English) Relationship Absolute K R R = 1.8 x K Practical C F F = 1.8 x C + 32 K = C + 273.15 R = F + 459.67 5 Temperature Scales T R = T F = 1.8 x ( T K = T C ) USE ABSOLUTE TEMPERATURES IN ALL YOUR PROBLEM SOLUTIONS. 6 Solving Engineering Problems Previous problems you encountered have been fairly straightforward. The system was easy to define (only one type). There were few basic equations . You did not need to make assumptions . 7 Solving Engineering Problems ME 200 problems are not so straightforward. Three types of systems. Lots of basic equations. You now need to make assumptions . 8 Problem Solution Methodology Important steps to solve any problem in a systematic...
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 Summer '08
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