Quote:
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Originally Posted by GymRatZ
Doctor Evil wrote:
Go for rads at a design flow temp of 70C return of 50C, or even better 60C,
40C, as they do in parts of Scandinavia. Then you will get highly efficient
operation.
Where or how would one find/workout the design flow temp as per 60C 40C ?
I thought a radiator was.... well, just a radiator.
Pete
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90% plus of systems are designed to have radiators run with an 80C flow and 70C return. You can design the system to have 60-40C. Obviously the rads will be larger. But the lower temperature operation ensures high efficiency from a condensing boiler. Condensing boilers are more efficient the lower the return temperature. They can operate at a 20C flow/return temperaure differential, as opposed to 10C on a non-condensing boiler.
The manufacturers have tables to work out the rad size on 70-50, 60-40.