Post by account_disabled on Feb 19, 2024 7:15:45 GMT
Image. In the image above, compactness is calculated in reverse, dividing the area of the envelope by the volume it encloses. Therefore, the greater the volume, the lower the
“The greater the simplicity and compactness of the building, the less heat loss through the roof and walls. In cold climates, it is unattractive to achieve the Passivhaus standard with designs where the area-to-volume ratio is greater than : The general rule is, the simpler the form of a building, the lower its unit cost will be.” Passive house .
Definition of compactness
Compactness is defined in the Technical Building Code as follows:
Compactness (V/A): Relationship Phone Number List between the volume enclosed by the thermal envelope (V) of the building (or part of the building) and the sum of the thermal exchange surfaces of said envelope (A= ∑Ai). It is expressed in m³/m².
Therefore, the greater the volume, the greater the compactness for the same envelope surface . On the other hand, the greater the surface area, the less compactness for the same volume contained in said envelope. The greater the compactness, the lower the energy losses . But be careful, not always. This rule is mainly fulfilled in moderately cold climates .
The CTE definition of compactness adds one more paragraph. For the calculation of compactness, the calculation of the area of the enclosures and interior partitions in contact with other buildings or with adjacent spaces outside the thermal envelope is excluded.
What is it for
The current energy saving document includes the compactness factor in the DB HE section. In this section, conditions for the control of energy demand, certain regulatory requirements depend on compactness:
Overall coefficient of heat transfer . The limit K value , both for private residential use and for use other than private residential. Two compactness limit values are established in tables b-HE and c-HE
Compactness_table Klim private residentialCompactness_table Klim use other than private residential
Limit value of air change ratio n . The limit value n in buildings for private residential use with a total useful area greater than m² is limited by compactness. Table b-HE shows that there are two limit values n depending on the compactness value.
Compactness_limit value air change ratio n
Compactness calculation example
To calculate compactness, calculate:
The surface area of the envelope without counting party walls or interior partitions as specified in the previous paragraph: m²
The limit values of K for compactness intermediate between and are obtained by interpolating:
Climatic zone B: interpolate between and
Therefore the Klim value would be
As has been seen in this article, the calculation of compactness is quite simple. It is enough to add the heat exchange surfaces of the envelope. Therefore, surfaces of facades, roofs, openings and floors in contact with the outside air and/or the ground are counted.
“The greater the simplicity and compactness of the building, the less heat loss through the roof and walls. In cold climates, it is unattractive to achieve the Passivhaus standard with designs where the area-to-volume ratio is greater than : The general rule is, the simpler the form of a building, the lower its unit cost will be.” Passive house .
Definition of compactness
Compactness is defined in the Technical Building Code as follows:
Compactness (V/A): Relationship Phone Number List between the volume enclosed by the thermal envelope (V) of the building (or part of the building) and the sum of the thermal exchange surfaces of said envelope (A= ∑Ai). It is expressed in m³/m².
Therefore, the greater the volume, the greater the compactness for the same envelope surface . On the other hand, the greater the surface area, the less compactness for the same volume contained in said envelope. The greater the compactness, the lower the energy losses . But be careful, not always. This rule is mainly fulfilled in moderately cold climates .
The CTE definition of compactness adds one more paragraph. For the calculation of compactness, the calculation of the area of the enclosures and interior partitions in contact with other buildings or with adjacent spaces outside the thermal envelope is excluded.
What is it for
The current energy saving document includes the compactness factor in the DB HE section. In this section, conditions for the control of energy demand, certain regulatory requirements depend on compactness:
Overall coefficient of heat transfer . The limit K value , both for private residential use and for use other than private residential. Two compactness limit values are established in tables b-HE and c-HE
Compactness_table Klim private residentialCompactness_table Klim use other than private residential
Limit value of air change ratio n . The limit value n in buildings for private residential use with a total useful area greater than m² is limited by compactness. Table b-HE shows that there are two limit values n depending on the compactness value.
Compactness_limit value air change ratio n
Compactness calculation example
To calculate compactness, calculate:
The surface area of the envelope without counting party walls or interior partitions as specified in the previous paragraph: m²
The limit values of K for compactness intermediate between and are obtained by interpolating:
Climatic zone B: interpolate between and
Therefore the Klim value would be
As has been seen in this article, the calculation of compactness is quite simple. It is enough to add the heat exchange surfaces of the envelope. Therefore, surfaces of facades, roofs, openings and floors in contact with the outside air and/or the ground are counted.