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Lecture36_Vapor_compression_refri-handout

Lecture36_Vapor_compression_refri-handout - ME200...

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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 36 : Vapor compression refrigeration systems
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2 Outline Vapor refrigeration systems Analyzing vapor refrigeration systems Examples
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3 Vapor refrigeration systems - Purpose : keep certain area colder than the surrounding T - To make a thermodynamic analysis let’s use Carnot Refrig. cycle Turbine Condenser Compressor Evaporator ? ? 𝑊 ? 𝑊 ? 2 1 3 4 T H T L T s T H T C 2 1 3 4 a b
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4 Vapor refrigeration systems 4-1: Refrig. Enters evaporator as Mixture of Two-phase and changes the quality (from Q from Tc). T and P Const. T s T H T C 2 1 3 4 a b 1-2: Refrig. compressed adiabatically and become Sat. Vapor T C =>T H and P increases 2-3: Refrig. Enters condenser becomes Sat. Liquid by Q to T H . T anc P remain const. 3-4: Adiabatic expansion through Turbine. T H =>T C and P decrease
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5 Vapor refrigeration systems T s T H T C 2 1 3 4 a b Carnot cycles are all internally reversible process. ?𝑑? = 𝛿? 𝑖?? 𝑟??
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