flue gas condensation question

Gordy

It sounds like my scenario, in the summer my unit is off (no standing Pilot) and I have that time lapse before I hit 140* on heat call.I do not understand why the WM tech said a little surface rust would be a good thing.

Mike T., Swampeast MO

Rocket Science

YES!!!

Viessmann Vitodens burner--supposedly it's allowed to be run JUST AS PICTURED in trade shows while STILL meeting those tough German air pollution standards...

Viessmann website supposedly claims it produces 107% efficiency. (I won't go there because I have an idea in my head to make it "better" and prefer not to "pollute" such with preconceptions regarding "why" and "how".)

If you look back at my recent posts regarding the nature of combustion I think you'll understand why I'm asking the questions...

107%???? I understand 100+% regarding a heat pump but a COMBUSTION device whose exhaust temp is still warmer (AND generally more humid I might add) than the temp of the incoming air??? One way this makes sense to me is if the BTUs derived from condensing are a "bonus" and not considered to be "part" of the BTU content of the fuel to begin with... Other explanations in my head are hideously bizarre.

Kal Row

lets assume the 100%

Is the maximum, normal gas conductive heat produced, any additional energy, ie infrared radiant, latent heat of condensation, etc to be considered extra, so you get to more than the “NORMAL” maximum,

They haven’t scratched the tip of the iceberg with this stuff, you mentioned “heat pump”, and condensation, and radiant, what about catalytic induced effect, also the mesh dome then produces the radiant can be made out of multilevel radiating strands or zirconium and platinum wires friction-stir welded to together to form and large thermocouple array that feeds more radiant filaments or resistive loads

With all this shtick, you can solve the load matching problem, ie: all the new boilers buy the most savings, on low temp loads like radiant heat, and domestic hot water, for a system that needs 180f water supply, and 160 back, the 160 water would not be able to extract all the heat from the exchanger in fact it would lose heat to a fully condensed one!

But with all the other stuff mentioned we could do energy conversion, ie we cant make more energy than there are btu’s in the fuel, but you could match the temp to the load – so instead of letting the 160f return water from a baseboard system hit a fully condensed heat exchanger, we could instead run it to a resistive heater driven by the thermocouple array, or a catalytic generator, or a heat pump, And then, on to the hottest part of the “normal” heat exchanger,

It’s all going to boil down to the cost per therm – that’s what’s going to drive all this cool stuff