Aha perfect time to jump in... I have been going through these calcs on Clarke's website all yesterday. I have a situation where we are looking at 125 degree ambient temperature (outside) and about 120 degree water that will be used for the heat exchanger. Using a delta t of 10 degrees F for the pump room I am getting about 20,000 cfm needed for ventilation of the engine I have selected. So I have derated the engine based on 130 degrees temp in the pump room ( I know the code says 120 is max but what can we do that's what we're starting at outside). We may also have to go with a larger cooling loop also given the water temperature.
So here's the question. I have selected a diesel engine because we do not have a reliable power supply, so... What about the ventilation fans? If the power goes out because of this unreliable power supply, I wont have the ventilation fans. Just wondering if anyone has dealt with looking at the reliability of the ventilation fans before. I looked at FM data sheets and did not see it addressed as well as NFPA 20. My current solution will be to provide a small genset for the just the fans and the motorized dampers that are part of the ventilation system. This is preferrable (I think) to going with electric pumps with a larger generator. Justin Reid Sent from my iPhone On Aug 24, 2012, at 3:55 AM, å... .... <[email protected]> wrote: > NFPA 20; consider not just combustion air, but cooling air > for the convective/radiative heat leaving the engine, cooling > air needed by radiator, flow path restrictions, etc. Also > consider highest expected maximum ambient temperature (with its derating) > and consider altitude (and its derating). > > Scot Deal > excelsior fire > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: > <http://fireball.firesprinkler.org/mailman/private/sprinklerforum/attachments/20120824/c95d0dc8/attachment.html> > _______________________________________________ > Sprinklerforum mailing list > [email protected] > http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum _______________________________________________ Sprinklerforum mailing list [email protected] http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum
