HELP!!!

doug_10

I posted this message earlier this week with only two responses. I know someone out there must have experienced what I am triing to do. I have been involved in the renovation of a large single family home. The steam boiler is not very old and the steam system works very well. I was asked to add heat to areas of the home that were not previously heated. Because of their location in the home it was decided to heat these areas with forced hot water. I added three zones of forced hot water baseboard and one zone of radiant heat. The boiler is large enough to handle the added btu's. I was left with the decission of how I would connect the hot water zones to the steam boiler. I had successfully done a similar addition in the past, on a different job, using an Everhot sidearm heater and creating a closed system. I decided to creat a closed sytem yhis time and used a 30 gallon indirect water heater. Each zone is individually pumped and that end all seems to work well. Except I can not seem to generate hot water fast enough in the water heater. I also have a 60 gallon Super Stor connected to the steam boiler for domestic hot water. No problem with the hot water! I increased the circulator size connected to the coil of the water heater and still am only able to generate a constant 150 degree flow out to thw heat zones during the coldest weather. I am considering replacing the 30 gallon residential indirect with a 45 gallon commercial unit. I will increase the coil size from 15 to 40 square feet by doing this. My total heat load is 13,500 Btu's. I hope that someone out there can offer ideas for me to consider.

jim sokolovic

Not sure if this is a factor...

but why do you want so much volume (30 or 45 gal.) in the secondary heat exchanger?

doug_10

Thank you for your response. Voluume is not needed in this installation. Adaquate heat transfer is what is really needed. I have considered the larger tank only to obtain a larger surfaced coil. Am I missing somthing here? Should the answer / solution be as clear as the nose on my face?

Harry Wheeler

Steam to Hot Water

Altough i have not experienced this problem,i suspect that the flow rate may be to great or the condensate temp. may be to low.Is the steam boiler fired when you have this problem.

kevin coppinger_4

why the hx...

you could do it w/o one. If I were you I would go back to what worked, the side arm...sounds like you are out running the volume in the boiler and diluting it too much. kpc

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mellow

heat

Just a question. When testing this,is the boiler only heating the tank for the zones? I know that should not mater,but the recovery of the tanks rely on 180 deg water.... How about three 4 gpm zones plus radiant. Is that 12 gpm flow off the tank? Can this tank handle that and stay hot? Could be drawing too much too fast would have to know more details.

Steamhead

Or

the piping from the boiler to the HX might not be picking up enough heat from the boiler. They should connect on the opposite sides of the boiler to secure the most heat transfer.

How about some pics?

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