Info

0.232 0.232

(660X0.205) (120X0.205)/ = 17.1 Btu/(h)(°F)(ft length)

UA in SI units:

Since the area of the tube cross section is expanding perpendicularly to the heat transfer, a mean area (Am) value must be sued in determining UA, and the basic equation becomes

Outside fluid film (h0) Outside scale (hos)

Exchanger wall (kw)

Figure 4. Temperature profile for heat exchanger in which heat transfer area is not constant.

Inside scale (hi,)

Inside fluid film (A;)

Figure 4. Temperature profile for heat exchanger in which heat transfer area is not constant.

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