Compact Heat Exchangers

Compact Heat - Good source is Kays& London Results are correlated in terms of Colburn j factor Colburn j factor 2 3*Pr H j St = Stanton number p

Info iconThis preview shows pages 1–16. Sign up to view the full content.

View Full Document Right Arrow Icon
Compact Heat Exchangers
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Used to achieve very large heat transfer surface area per unit volume Liquids >= 400 m 2 /m 3 Gases >= 700 m 2 /m 3 Have dense arrays of finned tubes or plates Typically used when at least one fluid is a gas (thus, small convection coefficient)
Background image of page 2
Geometry Tubes may be flat or circular Fins may be plate or circular
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Geometry - continued Parallel-plate heat exchangers may be finned or corrugated May be used in single-pass or multi-pass modes of operation
Background image of page 4
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Geometry - continued Flow passages are typically small Dh <= 5 mm Flow is usually laminar
Background image of page 6
Heat transfer and flow characteristics Many have been considered Data is available
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 8
Background image of page 9

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 10
Background image of page 11

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 12
Background image of page 13

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 14
Background image of page 15

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 16
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Good source is Kays & London Results are correlated in terms of Colburn j factor. Colburn j factor 2 3 *Pr H j St = Stanton number p h St GC = G max fr ff ff fr VA m m G V A A A ρ σ = = = A and σ Aff = minimum free-flow area of the finned passages (cross-sectional area perpendicular to the flow direction) Afr = frontal area of the exchanger σ = A ff / A fr Reynolds number, Re Re h GD μ = Pressure drop across heat exchanger 2 2 (1 ) 1 2 i o m i ff i G v v v A p f v A v σ ∆ = +-+ V i = fluid inlet specific volume V o = fluid outlet specific volume V m = (v i + v o ) / 2...
View Full Document

This note was uploaded on 02/15/2012 for the course EML 4147C taught by Professor Abbitt during the Spring '11 term at University of Florida.

Page1 / 16

Compact Heat - Good source is Kays& London Results are correlated in terms of Colburn j factor Colburn j factor 2 3*Pr H j St = Stanton number p

This preview shows document pages 1 - 16. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online