Combining Heat Transfer Coefficients
For two or more heat transfer processes acting in parallel, heat transfer coefficients simply add:
For two or more heat transfer processes connected in series, heat transfer coefficients add inversely:
For example, consider a pipe with a fluid flowing inside. The rate of heat transfer between the bulk of the fluid inside the pipe and the pipe external surface is:
where
- q = heat transfer rate (W)
- h = heat transfer coefficient (W/(m2·K))
- t = wall thickness (m)
- k = wall thermal conductivity (W/m·K)
- A = area (m2)
- = difference in temperature.
Read more about this topic: Heat Transfer Coefficient
Famous quotes containing the words combining, heat and/or transfer:
“Adolescence is society’s permission slip for combining physical maturity with psychological irresponsibility.”
—Terri Apter (20th century)
“And suddenly, to be dying
Is not a little or mean or cheap thing,
Only wearying, the heat unbearable ...”
—John Ashbery (b. 1927)
“I have proceeded ... to prevent the lapse from ... the point of blending between wakefulness and sleep.... Not ... that I can render the point more than a point—but that I can startle myself ... into wakefulness—and thus transfer the point ... into the realm of Memory—convey its impressions,... to a situation where ... I can survey them with the eye of analysis.”
—Edgar Allan Poe (1809–1849)