Window Coverings Environmental Efficiency
Warm and Cool your home efficiently with Classic Blinds window coverings
Classic Blinds and Shutters invest in our product research and development to deliver a superior product for our customers. After an extensive study in to the environmental efficiencies of blinds and shutters we can advise on the solution that will best suit your home.
Comparative Efficiency Study
We were aware that there were a lot of extravagant claims circulating, regarding the impact window coverings can have on energy bills. We commonly saw “Reduce energy bills by 80%, 70% or 40%“ and wanted to test the possible accuracy of these claims and use the results to develop and improve our understanding of how window coverings impacted on heat gain or loss and light block out. With this improved understanding, we would be able to advise clients more effectively and improve our own product range.
We sought academic help in designing our experiment, analysing the data and writing the report VIEW WINDOW COVERINGS STUDY REPORT
We constructed a laboratory and equipped with 2 testing cells, one with an ‘ultimate window covering’ (UWC) – a polystyrene panel 60mm thick, used as a control and to set a benchmark. The other cell was used to measure and monitor the light and temperature of a variety of window coverings and in what turned out to be crucial, different colours.
At its most simple, the testing was done by creating two identical, thermally-stabilised ‘rooms’. The entire test environment was stabilised with 24-hour air-conditioning to 22C. Two simple heat sources were applied to the rooms with precisely the same amount of heat and a window covering was placed in one of the test rooms to test against the control room.
Testing was run for close to a two year period.
The UWC produced a reduction in heat gain by 39.7% which we knew from previous University of Newcastle research was close to the maximum possible of 40%. Generally heat gain or loss from an average house would be 40% through the windows.
The best performing internal window coverings to prevent heat gain were white western red cedar plantation shutters
And the best performing for light block out was black Eco frame Aluminium planation shutters
We found that colour had an enormous impact, white was much better at reflecting radiant heat ie heat generated from light and black was much better at absorbing light rays.
Window Coverings Energy Efficiency
We developed this energy rating system following the comparison study.
We tested a range of products in identical facilities using the same procedures and methodology as outlined in the Report “A Comparison Study of Various Window Coverings” peer reviewed by The University of Newcastle’s consulting arm Newcastle Innovation. The following information outlines the findings of this study
Alternatively come and visit our Parry Street Showroom to discuss how our range of window coverings provide difference thermal efficiencies for your home.
Efficiency Test One
Window covering heat gain into a building.
Results are based on the difference in average temperatures taken over a 9.5 hour period, in two identical chambers. We initially tested the ultimate window covering, a 60mm polystyrene block to set our bench mark of 40%. Then a range of window coverings were tested and compared to a pane of glass. A comparison of the differences in temperature were measured over 9.5 hour period. For example: block out fabric roller blinds reduced the total heat into the house by 18.3% (based on satin white colour). In essence, the higher the percentage represents a better energy efficiency. Note that colour was found to be a major driver with satin white vastly outperforming satin black.
Efficiency Test Two
Window covering heat gain through window only.
Results are based on the difference in average temperatures taken over a 9.5 hour period, in two identical chambers. We initially tested the ultimate window covering (UWC), a 60mm polystyrene block to set our bench mark of 40%. Then a range of window coverings were tested and compared to a pane of glass. A comparison of the differences in temperature were measured over 9.5 hour period. For example: block out fabric roller blinds are 46.1% (based on satin white colour) as effective as the UWC at blocking out heat. In essence, the higher the percentage represents a better energy efficiency. Note that colour was found to be a major driver with satin white vastly outperforming satin black.
Resulting product development
We are always looking to improve our products through our continual research and development.
Our team are always learning and implementing new technologies in to our products to improve the overall experience they provide our customers.
From the results of the comparative efficiency study we ran over a two year period to understand the impact of window coverings can have on light and heat control we developed a z shaped frame for our internal Aluminium Plantation Shutters and included a rubber seal. This created a sealed unit when the blades were closed and prevented the movement of the heated air into the room.