Heat transfer of glycol vs water in the same pipe
Heat transfer of glycol vs water in the same pipe
(OP)
I am interested in the effects of propylene glycol anti freeze on heat transfer in hydronic heating systems, baseboard and radiant floor heating. I have information on viscosity, density, Reynolds number, Prandtl number, Nusselt number and thermal conductivity for both fluids. I have used the Dittus-Boelter correlation for tubulant flow but am unsure of my results. Any information or sources would be appreciated.





RE: Heat transfer of glycol vs water in the same pipe
The only reason to add glycol is if there is a risk the system will be exposed to temp's. below freezing. At higher temp's. glycol may reduce vapor pressure/boiling/cavitation concerns. I have had people tell me they add glycol antifreeze for the corrosion protection...but why not just add corrosion inhibitors to pure water?
RE: Heat transfer of glycol vs water in the same pipe