Friction/Head Loss thru Heat Exchanger

Plumdog_2

Has anyone determined what difference, if any, there might be between pumping requirements for the various boiler brands using the Gionnani heat exchanger? I guess I'm curious if the different brands have different friction/head loss thru the manifolding and heat exchanger due to the way they are assembled. Some install manuals specify higher head pumps than others; and I guess I'm wondering if this is a CYA on thier part?   

hot_rod

I suspect

there are many versions used. I remember seeing the Gionnani booth at ISH a few years ago, they had dozens of different HXers on display.



But I think you are correct in the over sizing fudge factor. I have one of the earliest Knights 80K's and it has been running happily with a Grundfos 15-58 on mid speed, even when it kicks up to DHW priority.



I do have it connected to a large bore indirect coil, I'm sure that helps.



Reminds me of the old copper tube battle cry "you need a bigger pump"



hr



hr

Mark Eatherton

This ain't your grandpas Gianonni any more....

I am simply amazed and stunned with the technological advances of hydronic combustion heat sources. I met a gent named Hans Presel of Germany 35 years ago that had a "Heat Box" that would cut the energy consumption of any load by a minimum of 30%, just due to the burner/heat exchanger efficiency. He wanted me to help him install one in a hotel near my home town, and I turned him down because it didn't have the right approvals, and so on and so forth. He installed it himself. Reduced the hotels energy consumption by 40%.



Check out what their other heat exchanger designs look like. I like the Fat Boy to the left of the screen.



http://www.giannoni.fr/products.php



These are some amazing, exciting times :-)



BTW, I'm pretty sure I've seen the PD charts on their web site someplace.



ME