I want to add a zone to my wood boiler to heat the garage. The wood and
oil boilers are tied together so oil can heat when nobody is around to
put wood in the wood furnace.
Since I won't be heating the garage all the time and don't want to keep
draining and refilling the system how about antifreeze in the system?
Should it be that RV stuff and can I leave it in the system all the time
at 50/50 mix?
Antifreeze doesnt transfer heat as efficiently as water, it will cost
more to heat with 50-50 antifreeze. Some mechanic put in 100%
antifreeze in my car, it overheated for years and wouldnt heat the
inside of the car until I found out and got it to a 50% mix. www.heatinghelp.com
is where boiler pros are.
HOWEVER, the amount of heat reqired to raise the temperature of a
given mixture can be higher or lower than straight water (which is 1
BTU per lb per degree F)
Antifreeze mixtures do not transfer as much heat as pure water, but
I'm not convinced it will make as big a difference in heating cost as
has been stated.
The combination of flow work and volume to provide equivalent heat flow
of a 50:50 ethylene-glycol mixture compared to pure water is +32% at
140F according to the figures at the link posted earlier....
I've not verified their calculations, but I've never found a significant
computational problem at EngineeringToolbox.com so I'd venture they're
in the ballpark, anyway.
I can believe the problem in a radiator w/ 100% if it was closely sized
capacity to begin with which many smaller, more recent vintage vehicles
are where weight and size were serious constraints to try to push
It's just a consideration we normally never think of...
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