Triple Glaze Windows

H JARVIS’ triple-glazed windows were used in Nottingham University’s “pod” experiment to show the true extent of energy savings that can be achieved in British homes.

And the results speak for themselves – with eco design saving almost three quarters on the amount of energy required.

Two students stayed overnight in special bedrooms – one with Passivhaus energy-saving techniques added in, and one without.

Passivhaus, developed by the Passivhaus Institute in Germany, is a simple system of building design that provides a high level of comfort for occupants but uses little energy for heating and cooling.

The Passivhaus pod in the Nottingham experiment used just 28% of the energy used by the other.

The non-Passivhaus pod was designed to conventional UK building regulations.

Designed to strict quality assurance processes, more than 30,000 Passivhaus structures have been built on the continent – and the system is growing in popularity on home turf.

H Jarvis also provided technical and design support for the experiment, which included specially designed EcoClear sealed units with high performance triple glazed windows on the Passivhaus pod.

Mr Glendinning, pictured right with one of the firm’s green products, said: “The university wanted to do two pods to demonstrate how much more energy efficient a house could be.

“Our supplier, Glassolutions, asked us if we would be willing to manufacture a window that meets current regulations for the pods.

“We knew there would be a fair saving – but we were very surprised that it was 72% difference.”

“The triple glazed windows look identical, it doesn’t alter the appearance of the house.”

He added: “There are many ways of achieving energy efficiency, there isn’t one silver bullet that gets you to Passivhaus standard, but obviously with the overall build fabric our windows can make a huge difference.

“This will raise awareness of what we are capable of with our windows.”

Professor Mark Gillott, co-director of the Institute of Sustainable Energy Technology at The University of Nottingham, said: “Evidence and feedback to date shows that Passivhaus buildings are performing to a very high standard, which is crucial, given that the discrepancy between design aspiration and as-built performance for many new buildings in the UK can be as much as 50-100%.”

The Passivhaus standard was developed in Germany in the early 1990s by Professors Bo Adamson of Sweden and Wolfgang Feist of Germany.

The very first dwellings to be completed to the Passivhaus Standard were constructed in Darmstadt in 1991.