4060

Reprinted by permission by Tranter Inc., Platecoil Division, Catalog 5-63

1. Consider usual fouling for this service.

2. Maximum values of U should be used only when velocity of fluids is high and corrosion or scaling is considered negligible.

3. "Natural convection" applies to pipe coils immersed in liquids under static conditions.

4. "Forced convection" refers to coils immersed in liquids that are forced to move either by mechanical means or fluid flow.

5. The designer should be aware that a natural circulation will arise in the heating mode once the coil is turned on. This natural circulation is not to be confused with forced circulation, which is referred to as "agitated."

Reprinted by permission by Tranter Inc., Platecoil Division, Catalog 5-63

1. Consider usual fouling for this service.

2. Maximum values of U should be used only when velocity of fluids is high and corrosion or scaling is considered negligible.

3. "Natural convection" applies to pipe coils immersed in liquids under static conditions.

4. "Forced convection" refers to coils immersed in liquids that are forced to move either by mechanical means or fluid flow.

5. The designer should be aware that a natural circulation will arise in the heating mode once the coil is turned on. This natural circulation is not to be confused with forced circulation, which is referred to as "agitated."

Table 6-23

Effect of Metal Conductivity on "U" Values

Table 6-23

Effect of Metal Conductivity on "U" Values

Application

Material

Film Coefficients

Thermal Conductivity (BTU/hr-tf-T/in).

Metal Thickness (in).

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Renewable Energy 101

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