List of scientific studies, download here
Outcomes of some studies
ESCORP 2005, by Physibel
When the solar shading industry makes a claim of energy savings, it should be able to demonstrate and quantify such savings. That was the object of the scientific study ES-SO commissioned in 2005, the report called 'Energy Saving and CO2 Reduction Potential from Solar Shading Systems and Shutters in the EU25', in short ESCORP-EU25 for the 25 member states. Physibel, an experienced and specialized Belgian building physics company, carried out the study and used the building simulation program CAPSOL, which has been validated according to standard ISO/FDIS 13791 (Thermal performance of buildings – Calculation of internal temperatures of a room in summer without mechanical cooling – General criteria). The study concludes that solar shading, if applied systematically, could reduce the energy needed for the built environment by almost ten percent. In the report you will find full information on the basic assumptions - and they are important!
Read the full report, download here
Executive summary: English - Dutch
One-page summary: English
Dynamic shading solutions for energy efficient buildings, by Sonnergy 2014
This study includes an update of the figures of the ESCORP report:
If 75% dynamic shading in Europe installed:
For an energy end-use split of 70:30 between space heating and space cooling the impact of dynamic solar shading systems is estimated to be a 30% saving in cooling energy use of 23.9 Mtoe/yr and a 14% saving in heating energy use of 25.4 Mtoe/yr. Taken together the potential energy savings which can accrue from the use of dynamic shading systems are a 19% saving in heating and cooling energy use of 49.3 Mtoe/yr and a carbon emissions reduction of 19% equivalent to a saving of 117 MtCO2/yr.
If in the future more cooling would be needed: energy end-use split of 50:50 the impact of savings for energy use and carbon emissions reduction in buildings will even add up to 22%. Read more on page 21 of the executive supmmary report, to be downloaded here.
Impact of Shading Devices on Daylight Quality in Offices, report TABK, Lund University- by Marie-Claude Dubois
This study includes a literature review, parametric studies of energy use, the development of design tools, measurements as well as simulations of daylighting in rooms with shading devices. The following principles were drawn:
- Shading devices can reduce thermal losses through the window significantly.
- The potential for energy savings is much greater with a simple exterior shading device with a low g – value than with any solar-protective glazing as the shading device can be removed during winter and the free solar heat gains can be utilised to offset the heating demand. This is a significant factor to consider in countries where the heating demand is dominant.
- Simple tools for early design stages must provide detailed information about the solar angle dependent properties of the window and the heating and cooling demand in the building.
- An optimum solution may be to combine a very efficient (low g-value) exterior shading device like an awning to prevent overheating in the summer, spring and autumn, with an interior device with a high g-value like to control daylighting, even in December.
- Shading devices should change the direction of the incident light rays, either by pure diffusion or by redirection (preferably towards the ceiling) as in the case of a venetian blind. The best shading devices are the ones which block or redirect direct light and let diffuse lighting come into the building.
- For a good entrance of daylighting a screen transmittance of around 15 % appears to be optimum for a south-oriented room with a medium window size.
- Download the full report, here