Under examination the Technical Building Code after order FOM / 1635/2013.
As we already know, on September 12, the Ministry of Public Works published in the BOE order FOM / 1635/2013, of September 10, which updates the Basic Document DB-HE of the Technical Building Code. In this new modification, measures are adopted to reduce energy dependence as well as greenhouse gas emissions, within the so-called 20-20-20 objective.
Below I will cite some of the most important modifications that this document introduces, among which the following stand out:
- NEW SECTION DB HE-0: Limitation of energy consumption.
This new document establishes minimum requirements in the consumption of primary energy of NON-RENEWABLE origin of the building or the extended part, so that said consumption IT IS LIMITED DEPENDING ON THE CLIMATE ZONE where it is.
IN BUILDINGS FOR PRIVATE RESIDENTIAL USE, The limit value in energy consumption is obtained as the sum of the base value of the energy consumption of non-renewable primary energy, depending on the winter climatic zone, obtained from table 2.1 plus a corrective factor per surface of the energy consumption of Non-renewable primary energy (obtained from the same table), divided by the usable area of the building's habitable spaces or the enlarged part in m2.
FOR BUILDINGS OF OTHER USES, The energy rating for the indicator Energy consumption of primary energy of the building or the extended part where appropriate, must be of an efficiency equal to or greater than class B. according to the basic procedure for the certification of the energy efficiency of buildings approved by Royal Decree 235/2013, of April 5.
- BASIC DOCUMENT DB HE-1: Limitation of energy demand.
QUANTIFICATION OF THE DEMAND (section 2.2).
IN BUILDINGS FOR PRIVATE RESIDENTIAL USE, the energy demand for heating the building or the extended part must not exceed the limit value, this value is obtained as the sum of the base value of the energy demand for heating in kWh / m2year for each winter climatic zone plus a factor corrector for area of heating demand, divided by the useful area of the building's habitable spaces in m2, both values taken from table 2.1 of section 2.2.1.1.1
The energy demand for cooling must not exceed the limit value of 15 kW · h / m2 · year for climate zones 1, 2 and 3, or the limit value of 20 kW · h / m2 · year for climate zone 4.
IN BUILDINGS OF OTHER USES. The percentage of savings in the joint energy demand in heating and cooling, with respect to the reference building or the enlarged part, must be equal to or greater than that established in table 2.2 of section 2.2.1.1.2
LIMITATION OF DECOMPENSATION IN BUILDINGS FOR PRIVATE RESIDENTIAL USE (section 2.2.1.2).
Compliance with the values of thermal transmittance and air permeability of the holes and the thermal transmittance of the opaque areas of walls, roofs and floors that are part of the thermal envelope of the building must be justified, so that they do not exceed those established in Table 2.3 of section 2.2.1.2.
TABLE ACCORDING TO UPDATE REGULATIONS:
TABLE ACCORDING TO THE ABOVE DB HE:
Verification and justification of compliance with the requirement (Section 3)
In accordance with the provisions of section 3.2. Justification of compliance with the requirement, the project documents must include the following information:
a) Definition of the climatic zone of the town where the building is located.
b) Geometric, constructive and uses description of the building: orientation, definition of the thermal envelope, other elements affected by the verification of the limitation of decompensations in buildings for private residential use, distribution and uses of the spaces, including the hygrothermal properties of The elements.
c) Profile of use and, where appropriate, level of conditioning of living spaces.
d) Procedure for calculating the energy demand used to verify the requirement.
e) Values of energy demand and, where appropriate, percentage of energy demand savings with respect to the reference building, necessary for verification of the requirement.
f) Minimum technical characteristics that must be met by the products that are incorporated into the works and are relevant to the energy performance of the building.
Calculation procedure:
As described in point 5 Demand calculation procedures, the calculation procedures may use simulation using a thermal model of the building or equivalent simplified methods.
- BASIC DOCUMENT DB HE 2: Performance of thermal installations.
In this section it is indicated that this requirement is developed in the current Regulation of Thermal Installations in Buildings, RITE, and its application will be defined in the building project.
- BASIC DOCUMENT DB HE 3: Energy Efficiency of Lighting Installations
As news the limit values established for the energy efficiency of the installation (VEEI) vary, so that the division of groups 1 and 2 that previously corresponded to the non-representation areas and the representation areas no longer appears.
According to section 2.2, installed power in the building, a new limitation appears corresponding to the installed power per square meter used for lighting the building, these values are limited according to table 2.2 depending on the use of the building.
- BASIC DOCUMENT DB HE 4: Minimum solar contribution of domestic hot water
In section 2.2. quantification of the requirement. The values in table 2.1 of minimum solar contribution are modified, which now do not depend on the energy source of the support installation. The intervals of total DHW demand between 5000 and 10000 l / day are unified.
In the range of 50-5000 l / day of demand, the values of the minimum solar contribution for climatic zones III, IV and V.
In section 4.1 of demand calculation. Table 4.1 of the reference demand is modified. New demand criteria appear, unifying a single dwelling use (previously it was different for single-family or multi-family). New uses appear corresponding to prisons, shelters, barracks and offices instead of administrative. It breaks down school use in two cases with or without happiness. With this new table, the demand is quantified in all uses in l / day per unit. of person.
In table 4.2 of minimum calculation occupancy values in private residential use They vary for homes with 4 bedrooms (5 people are considered), 5 bedrooms (6 people), 6 bedrooms (6 people) and more than six bedrooms (7 people).
In addition, in multi-family housing buildings, a centralization factor will be used to correct the value of the demand., said correction coefficient is obtained from table 4.3 based on the number of dwellings in the building, and is multiplied by the calculated daily demand for sanitary hot water at 60º
- BASIC DOCUMENT DB HE 5: Minimum solar contribution of domestic hot water
In section 2.2.1 of Minimum electrical power, the formula that establishes the minimum electrical power values to be installed is modified, so that the coefficient A, which previously depended on the type of use, is now set at a constant value of 0.002 and the value B becomes 5.
In section 4 of Calculation, An estimated calculation procedure is established to obtain energy in KW / h, from the power obtained for each climatic zone
+ Info:
- Order FOM / 1635/2013
- Access to the CTE portal … HERE.
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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.
