Prevention of fabric and interior furnishings fading from the sun

If you could block 100% of UV light than the fading would be reduced to approximately 1/3rd the amount. As the entire spectrum of light contributes to fading and it is very dependant on the material the best you can do is select a glass which has low damage-weighted transmittance has the symbol T-dw. This isn’t perfect as T-dw was developed …

Documentation required for a Certified Passive House

A fairly common question during the certification process is ‘What sort of construction documentation is required for a certified passive house?’ Required documentation for a Certified Passive House (Passivhaus) or PHI Low Energy Building is that sufficient to fully check the energy model and design quality and assure that the building was built as per the design. That sort of …

26 October 2018 Passive House Plus Jeff Colley: Study: extreme overheating not reflected in building simulations

Dangerous overheating in buildings may not be showing up in desktop studies, new research suggests.”   “Monitored operative temperatures of up to 47.5C recorded in a highly glazed apartment building in London were not reflected in software modelling of the same building, with temperature peaks in simulated scenarios between 18C and 30C cooler, depending on which weather files were used.” …

26 October 2018 Passive House Plus’ Kate de Selincourt: Performance gap much smaller for passive homes, research finds

This report reviewed detailed test measurements for air tightness and heating loads for passive houses and non-passive houses designed to meet an energy target. From this data the Passive Houses (Passivhaus in the UK) predicted performance matched quite closely to the measurements compared to other non-passive house designed buildings. “Most of the homes were fitted with mechanical ventilation with heat …

The Four Control Layers – Fundamentals of Building Science

The Building Enclosure and the Four Control Layers   Understanding of the building enclosure and the four control layers that make up the building enclosure is vital to understanding how the building enclosure will perform Enclosure The building enclosure is what separates the inside environment from the outside ‘natural’ environment. This includes everything from the paint on the outside of …

SE Certification Platform Checklist

Sustainable Engineering Ltd. provides client certification resources to help them with their certification process. The attached link to the PDF is a list of all the different entries of the Passive House Certification Platform to enable you to go through and just check off and make sure you’ve made each of these entries to make the certification process easier and …

Passive House Climate Files for NZ

As of 13 December 2017 there are six additional PHI certified climate files for NZ. These now cover all of NZ including the Chatham Islands. It is important to note these are all (excluding the Chathams file) based on work done by NIWA to develop regional files for NZ and this last set of climate certification work done by PHI …

WUFI

Hygrothermal modeling with WUFI Sustainable Engineering can perform hygrothermal modeling of your proposed assemblies using WUFI one or two dimensional software. Quick initial reviews of assemblies and more in-depth consulting to improve or fix the assemblies performance are available. Presentation for Expert Tour 2015 – Introduction to WUFI As part of the 2015 Expert Tour Sustainable Engineering Ltd. was asked …

Stress test your design for Overheating

I hate comfort complaints. Not the complaining bit – folks are nice – but I hate the failed expectations of comfort. This past summer I had several calls from clients living in certified Passive Houses. They say it’s too damn hot. What is going on here? The Passive House Planning Package (PHPP) appears to predict the overheating pretty well. When …

Glass is rocket science for high performance buildings

During a presentation at the South Pacific Passive House Conference in Christchurch (March 2017). I spoke on lessons learned from New Zealand projects. One of the biggest lessons we’ve learned is that windows are the rocket science in high performance buildings.  They are very advanced technology originally from the space industry and they can make your building high (sky high) …