ME200 - Lecture 19

ME200 - Lecture 19 - 10/6/2010 HeatExchangers,Mixing

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10/6/2010 1 Heat Exchangers, Mixing Chambers, and Throttling Valves ME 200 Thermodynamics I Purdue University , Dr. Tim Pourpoint – timothee@purdue.edu Lecture 19 October 8 th , 2010 • Application of First Law of Thermodynamics – Turbines •spec if ic volume increases; net work output Compressor Last Lecture – Compressors ic volume decreases; net work input – Pumps –Hea t transfer and PE almost always negligible for turbines and compressors; may need to consider KE ME 200 2 TODAY: t Exchangers – Mixing Chambers – Throttling Valves
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10/6/2010 2 •A heat exchanger is a steady flow engineering system used to transfer heat from one stream of fluid to another stream of fluid Heat Exchangers Check •N o work device mechanical or other forms •H e a t transfer with surroundings is minimized by using insulation; this of course depends on how you draw your control volume Nitrogen tube valves ME 200 3 •P E and KE changes usually negligible Hydrogen tube Tube Within a Tube Heat Exchangers Counterflow Parallel Flow Assuming negligible KE, PE, and heat transfer to surroundings: ME 200 4 0 CV CV dE Q dt  CV W 2 2 i ii ee i i ie V mh m gz       2 2 e i V mg z  0 e 
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10/6/2010 3
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ME200 - Lecture 19 - 10/6/2010 HeatExchangers,Mixing

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