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Lecture19_Heat_exchangers_throttling_devices-handout[1]

Lecture19_Heat_exchangers_throttling_devices-handout[1] -...

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1 Professor: Euiwon Bae Lecture Hours : MWF 1:30-2:20 in ME1130 Office Hours : MWF 2:30-3:30 in ME1091 Email : [email protected] Phone : 765-494-6849 Course website : http://engineering.purdue.edu/ME200 ME200 : Thermodynamics I Lecture 19 : Heat exchangers & throttling device
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2 Outline Heat exchangers Throttling device Examples
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3 Heat exchangers - Device for transferring heat from one fluid to another - Heating/cooling system, automotive (radiator) - CPU heat sink
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4 Modeling -Typical assumption - - - - Q
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5 Modeling Energy balance Mass balance ?? ?? ?? = ? 𝑖? − ? ??? = 0 Q 0 = 𝑄 𝑐𝑣 − ? 𝑐𝑣 + ? 𝑖 (ℎ 𝑖 − ℎ ? ) + (? 𝑖 2 −? 𝑒 2 ) 2 + 𝑔(𝑧 𝑖 −𝑧 𝑒 )
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6 Throttling device - Throttle :To produce decrease in the pressure via introducing restriction to the flow. -> partially open valve or porous plug - Ex : in refrigeration system valve is introduced to - P1 and P2 are up and down stream Pressure P1 P2 P1>P2; Decrease in P
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7 Modeling -Typical assumption - - - -
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8 Modeling Energy balance Mass balance ?
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