Film Coefficient, h

[engpes]

I am trying to determine the film coefficient, h, as defined in Tema chapter 7. I need this in order to determine the overal heat transfer coefficient for an indirect line heater (API 12k). The bath heat medium is water and the coil / tube medium is water as well. The heat medium water is heated to 190 F.

Are there. E

 

[engpes]

Sorry are there any sources that would give a published film coefficient between the pipe and water (bath and coils). Thanks.

 

[srfish]

Most process heat transfer text have a section that has a nomograph or equation for this type of heat transfer coefficient. One term to use to search their index is "natural convection". Kern refers to it as free convection.

 

[georgeverghese]

All information required to enable the derivation of hi, ho and overall U can be found in many heat transfer textbooks - try DQ Kern " Process Heat Transfer " as suggested. Mc Graw Hill has stopped reprinting this book, so you may need to get a 2nd hand one.