﻿ Heat Transfer | Oil & Gas Process Engineering

# Tag Archives for heat transfer

## Natural Gas Sensible Heat Duty at Constant Pressure

The sensible heat duty for natural gas at constant pressure is: Heat capacity is determined at atmospheric conditions and then corrected for temperature and pressure based on reduced pressure and temperature. The gas pseudo critical pressures and temperatures can be … Continue reading

12. September 2009 by Jack

## Approximate Overall Heat Transfer Coefficient

The calculation of overall heat transfer coefficient U using the equations previously presented can be rather tedious. Heat transfer specialists have computer programs to calculate this value. There are some quick approximation techniques. Table 2-8 comes from the Gas Processors … Continue reading

09. September 2009 by Jack

## Outside Film Coefficient (Shell-and-Tube Exchangers)

For shell-and-tube heat exchangers with shell-side baffles, the shellside fluid flow is perpendicular to the tubes. In this arrangement, the outside film coefficient can be calculated from the following equation:

09. September 2009 by Jack

## Outside Film Coefficient (in a Liquid Bath)

The outside film coefficient for a process coil in a liquid bath heater is the result of natural or free convection. Temperature variations in the fluid cause density variations. These density variations in turn cause the fluid to circulate, which … Continue reading

09. September 2009 by Jack

## Inside Film Coefficient

The inside film coefficient represents the resistance to heat flow caused by the change in flow regime from turbulent flow in the center of the tube to laminar flow at the tube surface. The inside film coefficient can be calculated … Continue reading

09. September 2009 by Jack

## Overall Heat Transfer Coefficient

The overall heat transfer coefficient is a combination of the internal film coefficient, the tube wall thermal conductivity and thickness, the external film coefficient, and fouling factors. That is, in order for the energy to be transferred through the wall … Continue reading

09. September 2009 by Jack

## Overall Temperature Difference

The temperature difference may not remain constant throughout the flow path. Plots of temperature vs. pipe length for a system of two concentric pipes in which the annular fluid is cooled and the pipe fluid heated are shown in Figures … Continue reading

08. September 2009 by Jack