Balancing Question

bml207

I have been working on finding the right vents for my radiators and have a  question:



The removal of a wall at some point in the past has resulted in the room with the thermostat (living room/dining room) having two large radiators. Using the 2 oz. chart from the e-book, I calculate one radiator needing a Gorton C and the other a #6. Does it make sense to drop a size on these two radiators to counter the large amount of radiation in the room or should I leave them as calculated?



The main is 55 feet of 2 inch pipe and has a Gorton #2 and a Hoffman #75 and I have included a system diagram if either makes a difference to the advisability of changing vent sizes. Thanks!

Jamie Hall

In my humble opinion

probably not necessary to drop the vent sizes.  The wall which as taken out was, presumably, and inside wall -- and most of the heat loss in a room is through the outside walls, windows, and sometimes the ceiling.  Therefore the actual heat demand probably hasn't changed that much.



However... if in the process of balancing for comfort, you find that that room is getting too warm too fast, then yes you might want to try a slower vent.  Balancing isn't all table and formulae -- it's partly what works and gives you the comfort you want.

bobby b

venting

how many edr is boiler

bml207

Boiler Size

The boiler is a Dunkirk PSB 5 section boiler rated (net) for 383 sq. ft. of radiation. I don't know the exact EDR of the convector in the addition or that of the basement radiator but my estimates shouldn't be off that much. Add it all up and the boiler is just slightly under-sized.



I was just wondering if the two large radiators in close proximity to the thermostat was cause it to shut off earlier than it would have if the wall was still in place.



Thanks for the help.

Paul48

Try

shutting one radiator off and see if the results are better. Rather unconventional, but maybe a TRV on one of the two?