Tag: Energy Efficiency

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I was first introduced to Passivhaus several year back when we decided to pursue it in the architect’s practice where I work. It seemed like the right step forward in so many ways. However, learning about the Passivhaus Standard and everything that is required for certification, presented many challenges. There were some technical challenges, but probably the biggest challenges were to the received wisdom that I held firmly onto at the time.

This somewhat tongue-in-cheek post explores some of those mindset challenges with the benefit of hindsight. It also explores some other mindset challenges that arise from delivering passivhaus architecture.

010 10 Things I hate About Passivhaus

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The Passivhaus Standard sometimes gets confused with a passive solar design approach, particularly when it comes to solar orientation. This often means people assume that solar orientation is critical for passivhaus, like it is for passive solar design.

On the other hand, sometimes those who particularly favour a passive solar approach assume that the opposite is true. That solar orientation doesn’t matter at all for passivhaus. And if you pick up a book on passivhaus, such as the one I reviewed last week, solar orientation doesn’t feature in the list of key methods or principles.

So which is it?

The key to passivhaus is an integrated approach to design. Solar orientation does matter for passivhaus. However, it doesn’t need to be the driving factor.

Solar orientation impacts on solar gain. The importance of solar gain depends on the type of building. (Passivhaus isn’t just for houses, remember?) And windows have other purposes besides heating!

009 Passivhaus Solar Orientation

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False.
I often read and hear people, including passivhaus experts, state that once a building is airtight it requires mechanical ventilation. This is not strictly true. And there are many examples of passivhaus buildings that operate using ‘natural ventilation’ during the summer months. An airtight building significantly reduces air movement through the building fabric: walls, floor, roof, window frames and junctions etc.. And we should never rely on this kind of air movement to provide the air that we breath inside a building, for ventilation, that is. (Fancy drinking the water that seeps through a leaking roof? It’s kind of similar.) A ventilation strategy and system that genuinely does work, and is used properly all year round, is needed in any building, airtight or not. Once you add comfort and energy efficiency into the equation, this almost always means mechanical ventilation with heat recovery will be required for some of the year. The comfort and energy efficiency benchmarks of the Passivhaus Standard certainly mean this is the case.

And this is where airtightness and mechanical ventilation converge – both are needed for comfort and energy efficiency.

004 Airtight-Passivhaus-MVHR Continue reading →

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Gary Vaynerchuk, the social media superstar and business leader, released a book in 2013 called “Jab, Jab, Jab, Right Hook” (#JJJRH) which uses a Boxing analogy to highlight the best approach to using social media channels. Jabbing is giving value to your followers & community, and the follow up Right Hook is asking for something, whether this be attention or sales. This means at least 75% of your posting on social media should be about giving value and sharing useful information and insights with your followers and community, not asking for attention or for a sale. Everyone appreciates generosity over being repeatedly asked for attention.

What has this got to do with passivhaus? The Passivhaus Standard is most well known as “the world’s leading standard in energy efficient design.” And energy efficiency asks building owners and occupants for something. It asks them to at least modify their behaviour and to pay more attention to the operation of their building. However, energy efficiency is actually only part of passivhaus. People don’t often realise that the Passivhaus Standard is also a rigorous comfort standard that ensures a building is free from draughts, free from cold spots, free from excessive over heating and provided with a constant supply of fresh clean air. And it does so with the minimum amount of energy.

Passivhaus throws an outstanding “Jab, Jab, Jab” of occupant comfort before hitting home with the solid “Right Hook” of energy efficiency.

Passivhaus-Comfort Continue reading →