radiation or heatloss? (Leo G)

Leo G_99

did a heatloss on a home 65,000 BTUH.

radiation as installed, about 100K.

boiler is 225K.

hot water free standing radiators.

Do I quote a boiler to match the heatloss or the installed radiation???

Leo G

Robert O'Connor_3

by the radiation!

Mark Eatherton1

If it's steam...

you have to match the radiation. If its hot water, match the load. The radiators will do what they need to do when they need to do it, and it allows you the opportunity to operate with lower temperature for the majority of the year.

ME

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Ted_9

If its hot water, this is what you can do.

Why not use the heatloss calc, use outdoor reset and set the system supply water temp lower than 180, like 160 or even less. You see, the larger radiators are actually a blessing, to someone who knows what they are doing.

PATRIOT HEATING & COOLING, INC.

Leo G_99

Merci. ya'all!

Leo G

Boilerpro_3

Definitely Heat loss

What use ar the extra BTU's and you end up with a much less efficiently operating boiler and less even temps.

With cast iron radiation and a properly sized boiler, I usually see about a 20F delta tee from on to off during burner sycle of about 20 to 30 minutes and about 1.5 cycles per hour. With this type of operation, I really don't see much gain from outdoor reset, unless you zone or use TRV's.

Boilerpro

Boilerpro_3

Definitely Heat loss

What use are the extra BTU's when sizing to hot water radiation and you end up with a much less efficiently operating boiler and less even temps.

With cast iron radiation and a properly sized boiler, I usually see about a 20F delta tee from on to off during burner sycle of about 20 to 30 minutes and about 1.5 cycles per hour. With this type of operation, I really don't see much gain from outdoor reset, unless you zone or use TRV's.

Boilerpro

jwade55_3

Both

Heat loss= boiler sizing.

Radiation = water temp.J

Constantin

Have you also had a look at their bills?

Heat loss calculations are well and good, but if you happen to know the degree days and the fuel consumpion of a house over the course of a year, you'll have a far better idea what the actual heat loss is than what HVAC-Calc and other programs put together.

Granted, a steam system has to be sized by the radiation surfaces, but you're dealing with hot water, so the required boiler size is more dependent on the actual heat loss. Just my $0.02

Plumbob

yeah!

> by the radiation!

Yeah! By the radiation! And multiply it by a factor of 5 to be safe...fewer callbacks! Customer will understand, just explain about how the existing boiler is too small!