067 GGP 0217

GGP February 2017

E N E R G Y E F F I C I E N C Y The market for warm edge spacers Mark Hickox, group sales director from UK warm edge spacer manufacturer and IG component distributor, Thermoseal Group, gives an insight into the current market and information required for selecting a warm edge spacer system. The information provided by the European Window Energy Label Scheme suggests that over 1 billion new windows will be sold by 2030. With the increased demand for triple glazing and the specification of warm edge spacer bars, this could potentially be 6-8 billion meters of warm edge spacer required to meet market demand. If these figures are correct, that’s approximately 500 million metres per year required just to meet demand for warm edge spacer in Europe. With only a handful of warm edge spacer manufacturers currently offering highest performance products, the market is large enough to sustain a continued growth in production of warm edge spacers to meet the demand. It is for this reason that spacer manufacturers such as ourselves continually invest in our production facilities to offer a continued supply of highest performance and best quality products. When selecting a warm edge spacer, it isn’t just about selecting the one with the highest performance. When saying this I feel the need to assure anyone looking at the figures should note that our Thermobar warm edge spacer tube and Thermoflex warm edge spacer flexible options are both ready for the international market with Passive House ratings of phA and phA+ and highest performance Bundesverband “When selecting a warm edge spacer, it isn’t just about selecting the one with the highest performance.” Flachglas (BF) data values of 0.14W/mK and 0.135W/mK respectively. They are also tested to various other international standards. There are, however, a range of considerations that need to be addressed. If you are exchanging a spacer system within a current Window Energy Rating (WER) calculation, it’s not just about selecting the spacer system with the best thermal conductivity value in whichever format you may be presented with the information, you will need to consider calculations carried out using the two box model which offers a truer reflection of the efficiency of the unit edge, as the type and value of the required secondary seal influences the efficiency value to a greater degree than the spacer bar. Both box one (the sealant value) and box two (spacer bar value) are quoted on BF data sheets. For example, consider the calculations quoted in the table above. These figures are also the basis for substitution of spacer systems within current Window Energy Ratings (WERs). A spacer system can be exchanged for another if it is similar and has an equal or lower two box calculation figure and it has an equal or smaller sightline. In terms of spacer bar, it’s worth noting that a spacer tube with a profile height greater than 6.5mm sightline (there are several with a 7mm+ sightline) cannot be substituted into a Thermobar WER as the combined two box depth of larger profiles will result in a smaller glass surface area used in a WER calculation (ie. the area where no spacer or sealant is showing) of the same window. This results in a reduced energy index value. Therefore, Thermix-TX.N cannot 67 www.ggpmag.com February 2017 Continued on page 68 Mark Hickox


GGP February 2017
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