We analyze how the climatic zone can influence the qualification of the energy certificate
As we already know, the energy demand of a property depends on the characteristics of its thermal envelope, as well as other factors related to the bioclimatic discipline regarding the location and the orientation of the building's facades according to the climatic characteristics of the place where it is located. .
When we try to obtain the energy rating of an existing property, we are highly conditioned by these parameters, given that they condition energy demand and greatly influence consumption and the final rating.
It seems logical, therefore, as established in Appendix D of DB HE 1 of the Technical Code, on climatic zones, which we must consider when we are faced with a property located in mountain areas within a certain province with significant altitude differences Regarding the provincial capital, we must consider another climatic zone since, obviously, climatic conditions vary.
Next we are going to analyze to what extent the climatic zone can influence the final qualification of the energy certificate using CE3X, through an example of a house in two cases, in the first case the climatic zone of Valencia capital is considered "by default" without taking into account the previous table, and in another case in which it is considered, since as we will see, due to its altitude it corresponds to a much more unfavorable climatic zone. We start from assessing that, obviously, the climatic zone to be considered will be different and that the rating scale will also be different.
CASE 1: We consider the default climate zone of the capital by province:
It is an individual block house, whose construction year is 1998, with a useful habitable surface of 99 m2, in this case in the general data tab of the CE3X we enter the town, indicating that it is Utiel, but we leave «for default »the climatic zone corresponding to Valencia, that is, zone B3.
We observe that the program gives us the following qualification:
CASE 2: Considerations of the climatic zone according to the altitude of the locality:
In this second case, since it is a house located in the town of Utiel, we go to Wikipedia to obtain its altitude, according to which it is 720m above sea level.
Taking into account that the reference altitude for Valencia is 8m, according to the previous table, we obtain that the difference in altitude between the town and the provincial capital in meters is 712 m, so that according to table D.1 of climatic zones we consider zone D1. When operating with the program we not only indicate the locality, but we will select that climatic zone (HE-1).
In this second case, the program gives us the following qualification:
CONCLUSIONS:
Regarding energy demand and consumption:
In this second case, much higher demands can be seen in heating compared to the first (from 74.5 Kwh / m2 it rises to 183 Kwh / m2) and also in cooling the demand appears as not qualifying, which indicates that there is no demand . Here it is shown how I commented at the beginning of the article the influence of altitude and climate on the energy demand of the property and ultimately on its rating.
Regarding the rating scale:
In this second case, it can be seen that the rating scale is different, so that in this second case the indicators used by the program are different and the intervals in each letter with respect to the kg CO2 / m2 indicator are greater.
Regarding the qualification obtained:
In this second case, it can be seen that with the demands and consumption obtained in the new rating scale, the home has worsened one letter, going from an initial F to a final G. I understand that this circumstance does not always have to occur, but given the conclusions obtained, it is important to always consider the appropriate climatic zone according to the second case, considering the altitude of the town according to table D.1 of climatic zones.
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Article prepared by José Luis Morote Salmeron (Technical Architect - Energy Manager - Google plus profile) Access to his website HERE, in collaboration with OVACEN.
