1) Confirmation: at Okofen, the 12 or 15 or 20 kW, it is rigorous the same machine with simply more or less open turbulators and the software porgrammed otherwise.
The only real question is that one, or else go to the "mini" (8 kW).
2) I confirm: still no identified case of undersized pellet boilers ... Why, I read messages! On the other hand, regular oversizing!
3) Another factor is that the outdoor temp varies between 6 a.m. and mid-afternoon. And the building has more or less inertia ... So that "buffers" the need ...
Anyway, don't worry. Install the 15 kw and I'm ready to bet that you will bridle it to 12 after the second winter ...
Loss and power pellet boiler
bnohit wrote:
Hence 16KW / 187m2 = 85W / m2 (=> or a building with very high energy performance)
Please note: BBC is an energy consumption of 50 kWh / m².year - modulated according to climatic zones (65 in Alsace).
You are talking about heating power and not energy.
BBC buildings have Ubat in the order of 0,5 to 0,6 W / m².K (the Ubat measures the insulation of the building, very precisely its "thermal porosity"). They "lose" 0,6 W per m² of surface in contact with the exterior and per degree of interior / exterior difference
So in your case, 20 ° inside by - 10 ° outside, it would be: 15 to 18 x S if it were BBC (S being the sum of the surfaces in contact with the outside)!
0 x
This new house to be built in the Paris region must therefore be certified bbc according to 2012 standards, without thermal bridges and leaks, and therefore at 50KWh / m2 / year !!
Or 4 times less loss than an old house from the late 70s to the early 80s with 200KWh / m2 / year and therefore with a boiler with 4 times less boiler power.
In the not cold Paris region, ('much less than Alsace) in winter the temperature is around zero and more with rare peaks at -5 ° C and still very very rare at -18 ° C, rare winters and very short, except in 1956 with -15 ° C for 15 days, which I never saw again and which marked me as a child (the Seine frozen like ice floe) !!!
So comparing with a bad old house well known by me, in the Paris region, at 200KWh / m2 / year, 135m2 and 20 to 25KW of maximum boiler power most of the time excessive, by rule of three simple of surface and 4 times less for bbc house we get to
20x187 / 135/4 = 7KW to 8,6KW
If you are guaranteed bbc, and waterproof, which is required by 2012 standards and advised to have a house at the top, you do not have to exceed this value because otherwise you will have problems at mild temperatures of 7 to 15 ° C typical of the Paris region with a pellet boiler that cannot go below a third of its power and therefore will overheat you a lot of months before and after winter.
It is better to have a simple auxiliary stove for the few days of extreme cold.
A priori, without classic errors of the 70s to 80s, (numerous thermal bridges, leaks, without double flow CMV, weak insulation, etc.), your house with 10cm of insulation and bricks in the walls, you should be very near bbc guaranteed in the Paris region.
Normally this must be guaranteed to you, in particular the absence of the many possible errors to hunt like the plague !!
It is in your interest to demand it for the value of your future home to the new standards which will give it full value if the prices of fuels and pellets which follow these prices, almost certainly increase.
In the Paris region the temperature in winter is often above 0 ° C and therefore the average of 0 ° C is a reasonable value and therefore the loss of walls with 10cm of insulation at 0,03W / m / ° C gives 0,03, 2W / m20 ° Cx0,1 ° C / 6m = 2W / m6 and 1000KW of losses corresponds to 2mXNUMX of walls which is probably not the case for you, except house tarabisquotée at pleasure or a max of windows to the north. !!
So a priori 6 to 8 KW should be enough, 10KW max, according to this simplistic assessment, which can and must be done thoroughly for a bbc house of 2012 standards that you must request by a real specialist duly guaranteed.
15cm instead of 1Ocm of insulation would be a useful investment for the future on a new house.
This is in line with the values given by Tomgey on different cases in different regions.
In addition, take -7 ° C for the usual is excessive in the Paris region and therefore the oversized boiler will have overpower problems at least 1/3 of its maximum power which cannot be reduced, often and very long, as explained by pellet specialists who are experiencing this problem and who must be listened to. !!
Otherwise the regulations with a heating curve with more than 150 okofen pages on econology leave me perplexed, because ideal to spend its time adjusting them endlessly, but it is the current fashion, while I would design them quite differently for me with a real regulation !!
Or 4 times less loss than an old house from the late 70s to the early 80s with 200KWh / m2 / year and therefore with a boiler with 4 times less boiler power.
I want to build a new house, and am interested in installing central heating (PC + DHW + radiators), with an Okofen Pellematic pellet boiler. ..
Region: Ile de France
Altitude: 130m
Exposure: South / North (50% of openings in the south, and 50% in the north)
Ceiling height: 2,60m (floor and ground floor)
Hab surface: 187m2
Construction form: rather in length (ratio L x W = 2/3 x 1/3)
Joint ownership: Detached house, no party wall
Levels: Full basement + Ground floor + converted attic
Masonry: 20cm hollow bricks
Insulation: mineral wool (320mm in the attic, 100mm on the walls)
Joinery: Aluminum with thermal break, double glazing with low emission argon gas
Heating: underfloor throughout the ground floor (anhydrite screed), low temp radiators. upstairs
DHW: 300L storage tank connected to the boiler
Comp. Heating : A wood stove is provided in the living room on the ground floor
Others: Large opening on entry, and staircase communicating with the basement arriving directly in the entry (at the bottom of the staircase, a door giving into a laundry room is planned, heated to minimum (17 ° C approx.), To create a buffer zone with the garage)
In the not cold Paris region, ('much less than Alsace) in winter the temperature is around zero and more with rare peaks at -5 ° C and still very very rare at -18 ° C, rare winters and very short, except in 1956 with -15 ° C for 15 days, which I never saw again and which marked me as a child (the Seine frozen like ice floe) !!!
So comparing with a bad old house well known by me, in the Paris region, at 200KWh / m2 / year, 135m2 and 20 to 25KW of maximum boiler power most of the time excessive, by rule of three simple of surface and 4 times less for bbc house we get to
20x187 / 135/4 = 7KW to 8,6KW
If you are guaranteed bbc, and waterproof, which is required by 2012 standards and advised to have a house at the top, you do not have to exceed this value because otherwise you will have problems at mild temperatures of 7 to 15 ° C typical of the Paris region with a pellet boiler that cannot go below a third of its power and therefore will overheat you a lot of months before and after winter.
It is better to have a simple auxiliary stove for the few days of extreme cold.
A priori, without classic errors of the 70s to 80s, (numerous thermal bridges, leaks, without double flow CMV, weak insulation, etc.), your house with 10cm of insulation and bricks in the walls, you should be very near bbc guaranteed in the Paris region.
Normally this must be guaranteed to you, in particular the absence of the many possible errors to hunt like the plague !!
It is in your interest to demand it for the value of your future home to the new standards which will give it full value if the prices of fuels and pellets which follow these prices, almost certainly increase.
In the Paris region the temperature in winter is often above 0 ° C and therefore the average of 0 ° C is a reasonable value and therefore the loss of walls with 10cm of insulation at 0,03W / m / ° C gives 0,03, 2W / m20 ° Cx0,1 ° C / 6m = 2W / m6 and 1000KW of losses corresponds to 2mXNUMX of walls which is probably not the case for you, except house tarabisquotée at pleasure or a max of windows to the north. !!
So a priori 6 to 8 KW should be enough, 10KW max, according to this simplistic assessment, which can and must be done thoroughly for a bbc house of 2012 standards that you must request by a real specialist duly guaranteed.
15cm instead of 1Ocm of insulation would be a useful investment for the future on a new house.
This is in line with the values given by Tomgey on different cases in different regions.
In addition, take -7 ° C for the usual is excessive in the Paris region and therefore the oversized boiler will have overpower problems at least 1/3 of its maximum power which cannot be reduced, often and very long, as explained by pellet specialists who are experiencing this problem and who must be listened to. !!
Otherwise the regulations with a heating curve with more than 150 okofen pages on econology leave me perplexed, because ideal to spend its time adjusting them endlessly, but it is the current fashion, while I would design them quite differently for me with a real regulation !!
0 x
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roy1361
- x 17
dedeleco wrote:Otherwise the regulations with a heating curve with more than 150 okofen pages on econology leave me perplexed, because ideal to spend its time adjusting them endlessly, but it is the current fashion, while I would design them quite differently for me with a real regulation !!
- depressing.
- desolate.
- disheartening.
...
0 x
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roy1361
- x 17
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