Build better houses to solve dry year energy problem

Newsflash: using less energy is better than generating more of it. I know that seems obvious given the cost of new electricity generation schemes but it’s even more significantly beneficial to reduce peak heating demand because of New Zealand’s big dry winter problem. The University of Otago’s energy programme is producing valuable work, and its latest paper by Michael Jack …

Revised ASHRAE standard gets serious on building decarbonisation

ASHRAE in the USA is really focusing on building decarbonisation, finally. ASHRAE Journal March 2024 contains a really readable summary of the changes to ASHRAE Standard 100-2024, Energy and Emissions Building Performance Standard for Existing Buildings. This amounts to a deep retrofit of the standard, which now will address both energy emissions (via Energy Use Intensity, EUI) and carbon emissions …

Simple timber buildings are ripe for retrofits

This Canadian retrofit project is encouraging: it’s an old timber-framed and clad building with single-paned glazing in timber frames. Built in the 1850s, it’s older than the New Zealand homes built from the same materials. Regardless, it’s this kind of construction that offers the best retrofit potential in New Zealand—even better if they are two-storey like this Nova Scotian example. …

10 Passive House design tips for keeping cool in summer

The high temperatures this past summer have served to sharpen everyone’s focus on how to design Passive House buildings to remain comfortable for longer when the temps spike. The team at Sustainable Engineering Ltd is working on detailed energy modelling in order to produce building specification guidelines. We’ve also been thinking about what could be implemented right away: finding the …

DefignTalks podcast talks operational energy

The first episode of a new podcast for architectural designers launched this week, and its first guest is Sustainable Engineering Ltd’s principal Jason Quinn. Hosts Glenn Murdoch and Casey Curtis kick off by considering operational energy (really, operational carbon) and ask, how big is the problem? As we design more durable buildings, does the balance between operational and embodied energy …

The Heights Whare keeps gathering attention

Newly certified LEB The Heights Whare has been featured in an extensive two-page (broadsheet) story in the Otago Daily Times. It can only be read online by subscribers (the ODT is the last independently owned major daily in the country and doesn’t give away its content) but these pics of the layout show the attention lavished on this terrific project. …

Easier ways to gather data to predict mould growth

Modelling mould growth in domestic environments using relative humidity and temperature is a useful technical paper, as it seeks to modify the VTT model of mould growth on surfaces to make it easier to use in built homes. The research also suggested the existing VTT model underestimates the risk of mould in domestic settings.  The authors surveyed a large number …

Bader Ventura is a certified Passive House project

Oddly, this write-up about Kainga Ora’s Bader Ventura project doesn’t make it explicit that the building did achieve Passive House certification. You can read a detailed case study by Sustainable Engineering here—our team certified this project and provided lots of technical support. The result is all the more impressive because Passive House performance wasn’t a focus from the very beginning …