EDR Of Pipe Rads?

Unknown

it was one of my first purchases awhile back, but you mention coils each directly fed with a fresh supply from a header, just wondered if this type was any different.<BR><BR>Dave

Unknown

I have an opinion from Ken

already, but I`m curious to see what others think. These are HW, is the EDR of these things calculated the same as heat from bare steel piping?
The water temp would ween-off as it spirals down, whatcha think?
I`ll bet there was some cursing going-on when he had to do-up some of those L&R couplings!

Dave

Mike T., Swampeast MO

EDR is literally the surface area of the pipe. For a simple rectangle just multiply overall length by the number of rows and compute surface area based on the pipe size.

Radiators of this type are known for high output relative to their EDR rating. When using standard EDR output tables, add 20%.

Coil radiators were never easy to make and even the dead men considered them expensive. Residentially, you'll most often find them in narrow rooms where conventional standing rads would have been obtrusive. They were more commonly used in well-constructed manufacturing environments.

DanHolohan

I'm in Boston today

and away from my books, but the ratings for these are in my book, "The Golden Rules of Hydronic Heating." I reecall that the amount of rows makes a difference in the convective output. Sorry I can't look it up just now. Maybe someone else has the book handy.