Practical case of a single-family home energy certificate (Chalet) through the CE3X application in energy certification.
In this post we are going to put a practical example and steps to follow in the drafting of the energy certificate of a "chalet". Including the economic study of the single-family home.
ENERGY CERTIFICATE OF A SINGLE-FAMILY HOME WITH CE3X
HOUSING GENERAL DESCRIPTION:
The building is a single-family house with two floors. On the ground floor we find an area with a bedroom with a toilet. The rest of the house is located on the first floor. Most of the ground on the first floor is in contact with the outside air as it has been left open downstairs, except for the sleeping area.
Year of construction 1960. Useful living space = 104.77 m2. Free height of plant = 2.50 m.
ENTERING DATA IN THE PROGRAM:
1.-Administrative data tab Ce3x:
We enter the data of the home, as well as the data of the client and the certifying technician. If we do not know the cadastral reference of the property, it can be obtained from the virtual cadastral website, from where we can download the cadastral file of the same, otherwise add an observation such as those required in "Observations of the energy certificate"
2.-General data tab in the energy certificate report:
We will reflect the year of construction of the house and its applicable regulations, in this case it is 1960 and therefore prior to the NBE CT-79, the type of building and the locality. In the event that the town is not within the drop-down list, another one will be marked and, if necessary, the climatic zone will be changed, since if the difference in altitude with the provincial capital is greater than 200 m. the climatic zone established according to table D.1 of Appendix D of DB HE-1 must be considered.
3.-Tab of the thermal envelope of the property to be certified:
3.1.-Facade walls.
The geometric characteristics of the enclosures are reflected in the following table:
We begin by introducing Façade 1 with Northeast orientation of the First Floor, which has a length of 8.96 and 2.50 m in height, the NE orientation is indicated, and since it has been found that the enclosures are double-leaf with no camera ventilated and it is known that they do not have insulation, their thermal properties are obtained in an estimated way by the program.
NORTHEAST FACADE 1 IN PL. 1st
And so we proceed until we enter all the facades of the house, each time the data of a new façade is entered we give it to add and in that way we create the new façade.
Single Family Home Shade Patterns:
Only the shadow pattern will be considered in the energy certificatecorresponding to the first floor floor slab section that flies over the ground floor 8 Southeast facade. Three vertical planes are considered that delimit the flight, starting from the eaves up to an elevation of 75º. The pattern in the following image is obtained, which must be associated with facade 8 and its openings.
3.2.-Soils:
The ground floor is a slab in contact with the ground (there is no sanitary chamber). While in the case of the first floor floor, as can be seen in the sketch, a large part of it remains in contact with the outside air. As it has not been possible to obtain sufficient information on their constructive composition, the thermal properties of both have been obtained by default.
3.3.-Interior partition:
The house has an upper deck resolved with a hipped roof made with partitions. Said roof will be introduced as a horizontal interior partition in contact with the upper non-habitable space.
3.4.-Gaps:
Facade 1 has two windows and a door, with the following characteristics:
WINDOW V.1:
FRAME ABSORTIVITY.
To obtain the absorptivity of the frame, click on the absorptivity tab and indicate that it is gray:
SUN PROTECTION DEVICES:
The V1 gap is affected by a 2.50 m deep overhang, a 15 cm setback from the plane of the facade, and a shutter, for the latter case it is considered that in winter they are raised to allow solar radiation to enter. , while in summer they are lowered to limit their entry, making a correction of the solar factor. We repeat the process until all the holes in all the facades of the house are inserted.
3.5.-Thermal bridges of the energy certificate:
In this case, the linear thermal transmittance values are adopted by default, since there are no plans of the house or enough information on how the encounters have been constructively resolved, in addition, the length of the thermal bridges must be reviewed for each case. . If this information is available, the program has the Thermal Bridge Library, which would allow us to obtain its value in a more exact way, knowing the types of encounters.
4.-Certificate Installations tab:
The house has a butane heater for ACS and a refrigeration equipment in the dining room for air conditioning, its characteristics and the demand covered are summarized in the following table:
In addition, in the case of the refrigeration equipment, it has been possible to verify by looking at the technical characteristics plate of the equipment that the Nominal Efficiency is 2.64 = 3.3 Kw / 1.25 Kw (Relationship between thermal power and consumption). Said Yield is expressed as per one, as per hundred it will be 264%.
DHW EQUIPMENT:
REFRIGERATION EQUIPMENT:
5.-Project qualification:
Once all the information about the envelope and facilities has been entered, we click on the tab, rate the project and obtain the rating of the home.
6.-Measures to improve the certificate:
A set of improvement measures is considered that includes the external cladding of thermal insulation on the façade and the improvement of the energy efficiency of the installation systems.
7.-Study of the economic viability of the certificate:
Once the improvements have been defined, we click on the economic analysis tab of the certificate, we will enter the economic data, the price associated with the fuels, where we indicate the cost of energy, which has been obtained from energy bills from the supply companies, as well as the annual increase in the cost of energy and the interest rate.
In the next tab we indicate for each measure its useful life and its cost, which are obtained from unit prices obtained from an official price base, or from an updated price catalog.
In the results tab we give you to calculate and in this way we obtain the simple amortization period of the proposed measures. The measures proposed for housing are amortized over a very long period, but their design should also be assessed.
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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. Follow us on Google+
