HERelations

# HERelations - (NTU-C exp-1 C 1-exp-1 = R R ε NTU Relations...

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1 ME 416 Computer Assisted Design of Thermal Systems Heat Exchanger Relationships Basic Definitions Effectiveness ( 29 ( 29 ( 29 ( 29 in C, in H, min in C, out C, C in C, in H, min out H, in H, H max act T - T C T - T C = T - T C T - T C = q q = ε Number of Transfer Units min C UA = Ntu Heat Capacity Ratio C C = C max min R

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ME 416 CAD of Thermal Systems 2 Effectiveness Relations Concentric Tube, Parallel Flow ( 29 { } C + 1 C + 1 NTU - exp - 1 = R R ε Concentric Tube, Counterflow ( 29 { } ( 29 { } C - 1 NTU - exp C - 1 C - 1 NTU - exp - 1 = R R R ε Cross Flow, both fluids unmixed { } [ ] 1 - (NTU) C - exp NTU C 1 exp - 1 = 0.78 R 0.22 R ε Cross Flow, C max (mixed), C min (unmixed) { } [ ] { } ( 29 NTU - exp - 1 -C exp - 1 C 1 = R R ε Cross Flow, C max (unmixed), C min (mixed) { } [ ]
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Unformatted text preview: (NTU)-C exp-1 C 1-exp-1 = R R ε NTU Relations Concentric Tube, Parallel Flow ( 29 [ ] C + 1 C + 1-1 ln-= NTU R R ε Concentric Tube, Counterflow ε ε 1-C 1-ln 1-C 1-= NTU R R Cross Flow, both fluids unmixed No Equation Cross Flow, C max (mixed), C min (unmixed) [ ] ε R R C C-1 ln + 1 ln-= NTU Cross Flow, C max (unmixed), C min (mixed) [ ] [ ] R R C 1 +-1 ln C ln-= NTU ε...
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HERelations - (NTU-C exp-1 C 1-exp-1 = R R ε NTU Relations...

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