enev regulation

CleverBox – energy-efficient roller shutters

 


 

The German EnEV regulation on energy saving in buildings significantly tightened the criteria for energy efficiency in new buildings at the beginning of 2016. It is related to the planned reduction of primary energy consumption and introduction of building energy-efficiency class based on end-user energy consumed.

To meet the rigorous demands of the western market, BeClever ordered an analysis of the  CleverBox roller shutter system for compliance with the relevant standard from the German WERNER Beratende Ingenieure Research Office.

CleverBox roller shutter boxes have been tested in various walls (single-layer, double-layer and triple-layer) for occurrence of cold bridges (tightness to the wall) and thermal transmittance of the joined components (wall with roller shutter).

For calculation of the cold bridge temperature coefficient fRsi of the structure, calculated based on fRsi of the wall and fRsi  of the CleverBox roller shutter, was used. The fRsi values of the structure ranged follows:

enev2-1

Wall structure with CleverBox roller shutter fRsi values fRsi EnEV Standard
Single-layer wall 0,74 ÷ 0,77 ≥ 0,70
Double-layer wall 0,75 ÷ 0,78 ≥ 0,70
Triple-layer wall 0,72 ÷ 0,77 ≥ 0,70

For calculating thermal transmittance of the joined components linear thermal transmission coefficient perspective ψ (psi) was used, which was determined based on coefficient U of the wall and USb of the CleverBox roller shutter; the values ranged as follows:

Wall structure with CleverBox roller shutter ψ  [W/(mK)] values ψ (psi) EnEV standard 
Single-layer wall 0,23 ÷ 0,28 ≤ 0,32
Double-layer wall 0,09 ÷ 0,17 ≤ 0,23
Triple-layer wall 0,11 ÷ 0,16 ≤ 0,25

Expert analyses and calculations clearly showed that the use of roller shutters in the CleverBox system (in all box and wall options) increases the energy-efficiency standard of the building ensuring compliance with the latest EnEV (2016) standard.

The analyses carried out by the WERNER Beratende Ingenieure Research Office is a further step (after acoustic and thermal performance certification tests carried out by the IFT Rosenheim institute) in proving high quality of the CleverBox system.

KEY

fRsi temperature coefficient determines the weakest point of the structure in terms of temperature transmittance (so called thermal bridge). Its value is equal to the difference between surface temperature of the structure and external environment temperature divided by the difference between internal environment temperature and external one. Coefficient is expressed in values between 0 to 1. The higher value of fRsi, means better thermal insulation properties.

USb thermal transmittance coefficient through structural element. It describes the amount of heat lost from the inside of a room (W) to the outside on the surface of 1m² at temperature difference of 1 K. Measurement unit of thermal transmittance coefficient USb is W/(m²K). Lower value of USb, means better thermal insulation properties.

ψ (psi) linear thermal transmission coefficient. It describes the amount of heat lost from the inside of a room (W) to the outside on the surface of 1m² at temperature difference of 1 K. Measurement unit of thermal transmittance coefficient USb is W/(m²K). Lower value of ψ, means better thermal insulation properties.

EXPERTISE FOR DOWNLOAD

Expertise (single-layer wall)

CBR 165x175 N

CBR 165x175 I

CBR 165x255 N

CBR 165x255 I

CBR 205x215 N

CBR 205x215 I

CBR 205x255 N

CBR 205x255 I

CBR 245x255 N

CBR 245x255 I

Expertise (double-layer wall)

CBR 165x175 N

CBR 165x175 I

CBR 165x255 N

CBR 165x255 I

CBR 205x215 N

CBR 205x215 I

CBR 205x255 N

CBR 205x255 I

CBR 245x255 N

CBR 245x255 I

Expertise (triple-layer wall)

CBR 165x175 N

CBR 165x175 I

CBR 165x255 N

CBR 165x255 I

CBR 205x215 N

CBR 205x215 I

CBR 205x255 N

CBR 205x255 I

CBR 245x255 N

CBR 245x255 I