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lecture9 - 9/11/2010 EvaluatingProperties Nickel Wire Clamp...

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9/11/2010 1 Evaluating Properties ME 200 Clamp Apparatus Disk Samples TPS Sensor Experimental Assembly TPS Sensor Nickel Wire Kapton Body 1 1.2 1.4 1.6 1.8 /m-K) Oxidized [T = 283 ~ 290 K] Activated [T = 287 ~ 291 K] Hydriding Purdue University , Dr. Tim Pourpoint – timothee@purdue.edu Thermodynamics I Lecture 9 September 13 th , 2010 0 0.2 0.4 0.6 0.8 0.1 1 10 100 1000 k eff (W P (bar) Last Week •Ene r g y Balance–Cycles: – Summation of all heat interactions (Q cycle ) must equal the summation of all work interactions (W cycle ) •Powe r cycles deliver net work output while refrigeration/heat pump cycles require net work input •Pe r fo rman ce parameters defined for the above cycles Power Cycle Thermal Efficienc ME 200 2 – Power Cycle – Thermal Efficiency – Refrigeration/heat pump cycles – Coefficient of Performance
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9/11/2010 2 •Pu re Substance •Pha se se Change This Week • Property Diagrams ME 200 3 •P u r e substance: Pure Substances •A single phase mixture of various elements or compounds is a pure substance as long as: e.g. ME 200 4 •A mixture of two or more phases is a pure substance as long as:
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9/11/2010 3 Phases of Pure Substances • Solid: – Molecules oscillate about “fixed positions, tightly packed; oscillation is related to temperature • Liquid: – “Chunks” of molecules float about each other; maintain molecular order ME 200 5 •Ga s : –No molecular order; gas molecules move at random large distances between molecules; small intermolecular forces •Mo le cu la r motion determined by temperature •H ighe
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lecture9 - 9/11/2010 EvaluatingProperties Nickel Wire Clamp...

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