steam install

ed wallace

have a customer with a 2 family house warm air heat 1st floor, steam heat on second floor, 1st floor originally steam heat hooked up to exsisting pipeing customer wants to put steam back on the 1st floor, how would you size the radiators, will be doing a load calculation to see if boiler is sized for the current heat load

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[Deleted User]

I'd do the heat loss,

and then I'd see if the radiators are sized to those numbers. Of course, they aren't, but you can see what per cent oversized they are.

If the whole system is going to run from a single thermostat, and there won't be TRVs on each radiator, I'd oversize the new radiators the same per centage. Then the whole system will run similar to when it was new.

It may cost about the same to put smaller radiators in, and put TRVs on the vent openings of the big radiators, or even on all of the radiators (except where the room thermostat is).

Noel