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[bmicky]

We have a question about design a cooling system with Propylene Glycol solution 52/48 at various temp and hence various viscosity values. System description: Propylene Glycol solution 52/48 will use as a cooling media at a Generator cooler. The Propylene Glycol will cool the hot air circulation at the Generator. Hot Propylene Glycol will be cooled by a dedicated air cooler consists of several fans and circulation pump.
The system is designed for 80F where 52/48 solution viscosity is around 3 cps. However min ambient temp at the area is around -30F with solution viscosity of about 250 cps.
Our concern is about start up of this system at a cold day (-30 F). Do we have to design the circulation pump for Propylene Glycol solution at -30F with 250 cps? Maybe we could circulate only small amount of Propylene Glycol solution at start up in order to reduce viscosity of the solution? Does any body have experience with such sys? What about the circulation pump motor? Does it need a heater or to be over sized?

Thanks in advance

[pawan]

Why do U want to use PG for cooling when ambient is -30°F. I mean can't U use CW. OR upto what temp U want to cool the air.