How should stove or fireplace installations be included in energy certificates?
The following questions were raised, which are representative of a search we did on the web regarding this topic.
- If the stove or fireplace is the main type of heating installation, how do I calculate its power and performance? (depending on the kg of material, its specific heat or combustion power, the capacity of the boiler or combustion chamber, and the burning time, or based on what !? and how would it be done, please) [consider the example of the typical mountain village houses where the only heating system is a fireplace for the whole house (and sooooo many blankets for the rest of the rooms xD)] [or a home with different wood stoves distributed in the different rooms (Let's go to the houses of the yayos of all life xD)]. We must also take into account the types of pellets in biomass stoves, for example, depending on the material the power can vary.
- If the stove or fireplace is not the main mechanism, what contribution do we associate with it? [Typical single-family house in cold areas that has its radiator system and at the same time a fireplace or stove that is used as support or as a replacement in the cold winter months]
- If it is only for decoration but is used occasionally, in this case it would be advisable to omit it?
- ¿What type of installation would correspond to it, would it be a "Standard Biomass Boiler"? Or how should it be contemplated in the program?
Based on the previous questions and taking into account that the installations of stoves or chimneys will be a critical and typical point when we carry out the energy certificate mainly in a single-family home. When in doubt in the energy certification report, we present the following responses obtained by various means.
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LINKEDIN ANSWER:
With the ce3x program once the envelope is final and consequently the energy demand of the house (which as you know is independent of the generator you use), you have to parameterize the facilities for which and with the initial data that you write, I recommend follow the guidelines below:
* Generator 1 / main: Select a constant performance type heating only equipment and as biomass / renewable fuel (firewood = biomass). Regarding the seasonal performance of this generator, in the case of wood stoves I have doubts since I have not prescribed any for 10 years, but I can tell you that it is surely much less than 75%.
1. - Generator 2 / Support: Regarding the Electro-convector, select a Joule Effect type heating unit and Electricity as fuel type.
1. - Generator 3 / ACS: As a generator only ACS I imagine that they will use an electric boiler for which it proceeds as in point 2.
Finally, and in the absence of power data from the generators, you only have to establish the percentage of demand covered by each generator and type of service (heating / DHW).
If the Electro-convector is of little power and / or localized use, you can define an area within the home (eg: living room) and cover a% of the area with Generator No. 1 and the rest with No. 2.
For a distribution of demands based on the installed thermal power, you can use as a criterion that in the Alava plain an isolated house for discontinuous use may need an installed power of the order of 150 w / m2.
If you need data on the thermal power of generator 1, check the manufacturers (Ergom, etc.) and make a volumetric equivalence based on the dimensions of the hearth where the wood is burned.
IDAE ANSWER:
The criteria for the completion of the building's energy efficiency certificate must be established by the certifying technician as long as they do not contravene the provisions of the mandatory Royal Decree.
Similarly, the criteria of the competent body of each Autonomous Community in charge of their registration must be taken into account. Therefore, we advise you to contact said body of the Autonomous Community.
However, we recommend that you consult the manuals for the CE3 and CE3X programs that you can download at the following link from the Ministry of Industry, Energy and Tourism:
EFINOVA ANSWER: (We believe that it is the most sensible, they are the ones who have made the CE3X)
It is an important question and who is really competent in the matter is the competent body of the Autonomous Community, so we recommend that you send the question to that body.
This situation is not specifically considered in the certification procedures because it was not in Calener. From our criteria:
* We believe that they should be introduced as standard biomass boilers. The installation data will not really have an influence on global emissions and therefore on the rating because the coefficient of transition from final energy consumption to biomass emissions is zero.
* If it is only used occasionally, I think it would be best not to include it. In this way, the certifying technician is being conservative and cannot be put in trouble.
We hope that it will be of help to the Certifying Technicians in their reports and qualifications before the daily work.
