140 Deg. Domestic & Hot water heating system?
140 Deg. Domestic & Hot water heating system?
(OP)
As part of a new condominium development, it is being suggested that we combine the domestic and hot water heating equipment into one system for a discharge temperature of 140 Deg. F. What are the cautions to design and install a system such as this?
Kind Regards,
B
Kind Regards,
B





RE: 140 Deg. Domestic & Hot water heating system?
If nothing else, the whole heating system will have to be designed with non-ferrous materials. The dissolved oxygen that is introduced continuously with the incoming domestic water supply will eat any iron or steel components in short order.
RE: 140 Deg. Domestic & Hot water heating system?
Kind Regards
B
RE: 140 Deg. Domestic & Hot water heating system?
I think if you move cold domestic water through the heating system in the summer to keep it circulation, you may get condensation problems. If you move hot water, you'll be heating the building when you don't need it. This will cost a lot of money to operate, and make the residents uncomfortable.
If you want the input of some people who can just run rings around me on this stuff, post your question at "www.heatinghelp.com" on the "Wall" sub-site. This is a forum for (primarily) residential/small commercial steam & hot water heating contractors and designers. My background is industrial & utility powerhouses, and these guys come at this stuff from a different angle. It's an excellent site, and I learn a lot there.
RE: 140 Deg. Domestic & Hot water heating system?
Kind Regards
B
RE: 140 Deg. Domestic & Hot water heating system?
Other thoughts: There are special temperature limiting faucets available for showers where hign temperatures are more of a safety hazard.
In a large scale operation, you'd have a Boiler operating at over 15 psig, and it would be under some local safety code any way, so that shouldn't be a problem.
Since you'll be ciculating water, you could have the water heater operate at 15 psig and then pump the heated water to 60 psig to use for heating and domestic use.
You could temper the hot water just prior to use in domestic service.
RE: 140 Deg. Domestic & Hot water heating system?