Colmant wrote:My circulator is still running a little after the burner stops to recover the heat from the heater and send it to the heating circuit, ...
Hello Colmant
Theoretically, in the heating body of a boiler, the T ° must not fall below 68 ° C:
it's for its lifetime
explanation:
Whether burning gas, wood or fuel oil, combustion produces CO2, CO, unburned and especially water vapor (necessarily in gaseous form)
and this water vapor, whether it is (in combustion product) at 100 ° C, 500 ° C, 1000 ° C or higher, always has the ability to liquefy (condensation) on a
cold wallbut it is found that at atmospheric pressure, the T ° of dew: T ° below which the water vapor can condense, it is on a wall below 68 ° C
as needed, to rust the steel, at the same time: oxygen and water (oxygen alone or water alone can not) (except electrolysis for water alone)
the fact of maintaining the wall of the heating body (facing the fireplace) at a T ° greater than the dew T ° simply prevents the rust from forming, and the boiler lasts very very long
in fact,
it only ages during startup, the time that the wall reaches the famous 68 ° Ca guy was saying to me: my heating engineer does not understand: he has built a lot of boilers like mine, and all the others have perished. But only the boiler of the guy in question produced hot water, and this throughout the year (instead of an electric cumulus), so the focus has probably maintained its T ° above 68 ° C
Probably such a boiler would have a better efficiency, and a gas outlet in the chimney cooler if the circulator could circulate water at less than 50 ° C (see 35 ° C when it is for heated floors ) on the wall of the fireplace, but if this wall is steel, in less than two, the boiler would be sucked
All the builders of steel furnace boil the water stagnant against the fireplace, and this water does not circulate in force, even with the circulator en route: this water is circulated only by thermosiphon with another compartment, which is directly in the circulator circuit
On the other hand, there are condensing boilers, which they are probably made of another material in the place where the water vapor produced during the combustion is supposed to liquefy and give at the same time:
540 calories per gram of water (passed from vapor to liquid) and thus draw 110% boiler efficiency
Colmant wrote:What would be needed is a circulator with a better performance, mine (wilo) is a real pump
it is true, all the small circulators have a yield probably lower than 20%
and it is necessary to think that the yield is better by using the 1ère or 2ème speed instead of 3ème, because it consumes less energy
bolt