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SteamGenerators_web - ENU 4134 – Steam Generators D Schubring Steam Generators I Determination of gross design parameters I Determination of heat

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Unformatted text preview: ENU 4134 – Steam Generators D. Schubring November 16, 2010 Steam Generators I Determination of gross design parameters I Determination of heat transfer rate I General SG analysis I Numerical approach for undetermined L and ˙ m channel problems We will focus on once-through steam generators that boil from x = 0 to x = 1; additional geometry considerations and systems involving steam dryers are beyond our scope. Determination of Gross Design Parameters I Shell-vs.-tube sides I Number of tubes, array organization, flow direction I Primary system I Entrance pressure I Entrance temperature I Exit temperature I Mass flow rate I Secondary system I Secondary pressure I Exit state (superheat) I Entering temperature I Mass flow rate Heat Transfer Rate Geometry: primary tube (inner and outer radii R i and R o , R o- R i = δ ). Heat transfer from tube to secondary q = q 00 s × 2 π R o = htc s ( T co- T m , s ) × 2 π R o (1) T co- T m , s = q 2 π R o htc s (2) Heat transfer from primary to tube q = q 00 p × 2 π R i = htc p ( T m , p- T ci ) × 2 π R i (3) T m , p- T ci = q 2 π R i htc p (4) Heat Transfer Rate (2) Heat transfer through tube T ci- T co = q 2 π k tube ln R o R i (5) Total heat transfer T co- T m , s = q 2 π R o htc s (6) T m , p- T ci = q 2 π R i htc p (7) T m , p- T m , s = q 2 π 1 k tube ln R o R i + 1 R o htc s + 1 R i htc p (8) Since R o ≈ R i ≈ R tube = Ro + R i 2 ... Heat Transfer Rate (3)...
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This note was uploaded on 07/18/2011 for the course ENU 4133 taught by Professor Schubring during the Spring '11 term at University of Florida.

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SteamGenerators_web - ENU 4134 – Steam Generators D Schubring Steam Generators I Determination of gross design parameters I Determination of heat

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