Page 412 - Handbook of Energy Engineering Calculations
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FIGURE 4 Logarithmic mean temperature for a variety of heat-
transfer applications.
SELECTING AND SIZING HEAT EXCHANGERS BASED ON
FOULING FACTORS
A heat exchanger having an overall coefficient of heat transfer of U = 100
2
2
Btu/(ft · h · °F) [567.8 W/(m · °C)] is used to cool lean oil. What effect will
the tube fouling have on the value of U for this exchanger?
Calculation Procedure:
1. Determine the heat exchange fouling factor
Use Table 2 to determine the fouling factor for this exchanger. Thus, the
fouling factor for lean oil = 0.0020.
TABLE 2 Heat-Exchanger Fouling Factors *
