Wood pellet burner on fuel oil boiler Buderus S115?

Heating, insulation, ventilation, VMC, cooling ... short thermal comfort. Insulation, wood energy, heat pumps but also electricity, gas or oil, VMC ... Help in choosing and implementation, problem solving, optimization, tips and tricks ...
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Did67
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by Did67 » 05/06/13, 17:32

Yes indeed. You have 100% reason.

I was in the moon!
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by Christophe » 05/06/13, 18:35

dirk pitt wrote:it's almost impossible to do at random.


Nice remark Dirk, I note it :)

For those who want no pif, there is this: table for the thermal calculation of the K building
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by Did67 » 05/06/13, 18:38

Just to explain my "thought": some calculators (pproximatives, we agree), are based on an assessment that I qualify as "on the spur of the moment": not isolated, weak, average, good insulation ... the basics of energy classification ...

Conversely, an ECD diagnoser does this in a non-intrusive manner. So, for me, pif.
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by Christophe » 05/06/13, 18:40

So did67 if I'm the opposite of the pif it's also the pif? : Cheesy:

ps: a example of thermal calculation of the insulation level K (of my cellar)
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by Did67 » 05/06/13, 19:02

A DPE, yes, for me, it is "a pif disguised as a scientific thing by the use of a software and a laptop"

Insofar as we do not know what is in the walls, the sealing of the frames, etc ... it is a rough calculation (more or less - because there are cases where the data are " fairly "known - if we" diagnose my house, I can give the "composition" of the walls but in what state is the LDV under my tiles ???]

And the organizer, the pretty hsitograms and the beautiful bill will not change anything.

So yes, it's pif!

Your beautiful table begins with 5 or 6 lines called "hypotheses".

So you conclude that what you calculated is exactly what your assumptions are worth ...

[on quite another thing: I make tables for my contingency budgets; about 32 people; in October of the year n for the whole year n + 1; until recently, I took the payroll of the year n, corrected a little more or a little less according to the arrivals of departures; and I fell into very little trouble; there, I am asked to make the individual painting, by pipe head; at the end of monstueux calculations, I come across something that is absolutely not more precise! So it's not the calculation that makes the result; it is the precision of the data used]
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by sapeur3873 » 05/06/13, 21:13

I quite agree with what did67 said.

and yes, I think that the heating specialist boiler wood / pellet had to do it for me by experience.

I contacted some heating wood / pellets to find out if they had already done the kind of installation that I want to do ...

no one in the corner does it.
but I found people who had already made this change ...

today 4T of pellets bought and brought down to the cellar ...
my mini silo that contains 11 bag is 165kilos is filled.

I did a burn test just to see a simple cycle of operation ...
ignition: about 2min (I simulated the flame for the detector by a flashlight on the sensor)
normal burn: during 5min the supply of pellets is 5 6 dry all 45 seconds around ...
stop: about 5 min .. or only the fan turns ... I guess it is to finish burning the pellets that are in the cups.
I may therefore have a significant overflow of the deposit ...
to see

I am ready to pass my pellet boiler.

and I will try to reduce the maximum power range, I do not need 25KW but 15KW maxi would be enough.
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by sapeur3873 » 11/06/13, 08:36

And here I installed the pellet burner in place of the oil burner ...
it works neatly.
I slightly reduced the power of the burner, it rises in temperature.

it takes about 30 min to mount the boiler from 30 ° C to 63 ° C to make hot water. the circulation pump for DHW starts only from 45 ° C.

the start-up time is obviously longer than the fuel and the ramp-up is more progressive.

the settings of the burner are not perfect, I end up with the fine dust in the bottom of burn pot burnt (it's perfect)
but also with small pellets imbrulés .. 3 days it makes me a small handful of deposit .. knowing that it turns 1 hour per day.

I implicate 2 points:
- a combustion not perfect (for that I wait to have the device to make the settings)
- I think that when the new pellets arrive (every minute) they push the old ones at the end of the grid, and with the ventilation they fall ...
the grid is slightly raised at the end, but may not be enough.

What do you think?
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by Did67 » 11/06/13, 13:31

sapeur3873 wrote:
it takes about 30 min to mount the boiler from 30 ° C to 63 ° C to make hot water. the circulation pump for DHW starts only from 45 ° C.

..... / ....

but also with small pellets imbrulés .. 3 days it makes me a small handful of deposit .. knowing that it turns 1 hour per day.


1) the start of the circulator 45 °: be careful, risk of cold water returns, so condensation in the exchangers the boiler; depending on the boiler, risk of corrosion ...

["top ten" boilers do not generally trigger below 60 °, for this reason = "anti-condensation" procedure]

2) it is in doubt poorly burned pellets at the start of combustion, pushed by the following ones who have time to burn ... and to be reduced to ashes.
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by sapeur3873 » 11/06/13, 18:37

as for the start-up temperature of the pump (knowing that I am heating my water to 55 ° C) and that the boiler rises to max 60 see 65 ° C if the water is very cold, it would be difficult to turn on the pump so late.
not having a motorized 3 channel, it is the boiler that regulates the temperature of the water in the circuit and therefore I can have water at 30 as 70 ° C according to the inside and outside temperature, so the circulator starts as soon as possible, it is the boiler that manages it!


for pellets.
I add a photo of my combustion chamber after 30 min.
Image

Image
we do not see very well, but there is a lot of non-burned residue.

the operating principle of the burner being quite basic I ask myself questions ...

I speak in normal mode, once it starts:

he rotates the auger every X seconds for Y seconds to drop pellets into the burn pot.

the basic parameters was
X = 45.0s
Y = 6.5s
so all 45s, the screw turned during 6.5s

I modify these parameters to reduce the power (and also the speed of the fan)
X = 60.0
Y = 5.2

for each of the power of the burner I can day on Y only and the speed of the fan.

Given the principle, the arrival of new pellet in package, cold, in the burnpot should not be top?
Would not it be better to have pellets that happen more often but fewer?
with a style parameter
X = 20 s
Y = 2 sec

do 20 dry dry 2 pellets?
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by Did67 » 11/06/13, 21:20

Frankly, I do not know. But I think so.

On my boiler, with a "volcano" system (the pellets arrive from below), the operation is indeed a few seconds off / a few seconds of supply (the program calculates in tenths of a sec - like 83 then 57 tenths second; both data vary depending on the modulation, which includes 17 levels)
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