Category: Passivhaus

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This blog post is a review of “Passive House Design – Planning and design of energy-efficient buildings” published in September 2014. Author and architect Roberto Gonzalo (who also wrote the 2012 title “Energy-Efficient Architecture”) and passivhaus architect Rainer Vallentin collaborated on this valuable guide for architects and designers.

This is a timely book as the delivery of passivhaus architecture accelerates around the world. As the authors note, more and more architects are finding their way to passivhaus:

…simply because it is one of the most scientifically sophisticated and practical energy efficiency standards for buildings currently available.

Thorough introductory and background material is provided for those that are new to the Passivhaus Standard. This is followed by chapters dealing with a range of subjects in suitable detail for those already familiar with the standard. Well-illustrated case studies complement both the introductory and the more advanced content.

“Passive House Design” is an extremely useful book full of beautiful photographs, clear diagrams and detailed drawings. It maintains the very high standard of presentation and technical detail that can be found in all Detail magazines and books.

Passivhaus architecture depends on the design and construction quality of the building envelope. This book guides you in designing the building envelope.

023 Passive House Design building envelope
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The Passivhaus Standard delivers radically energy efficient buildings with excellent occupant comfort. I have written about the comfort aspects of passivhaus before in the Gary Vaynerchuk inspired post and in one of the LovePH series.

Heating is a key element of occupant comfort. So why does the Passivhaus Standard have a limiting benchmark for heating energy of 15kWh/m2 per annum? Isn’t this contradictory?

While this may seem contradictory, there are good reasons for it. Firstly, heating makes up a significant proportion of energy consumption in buildings, so it needs to be addressed to improve energy efficiency and reduce climate change impact. Secondly, setting a very low heating energy benchmark drives a fabric first approach, which has several benefits, comfort being a key one. And thirdly, having a heating energy benchmark singled out from primary energy means it can’t be achieved by offsetting with renewables or any other energy accounting cheats.

15kWh/m2 for comfort – delivered with radical energy efficiency, fabric first design and no cheating!

022 Passivhaus Less Heating More Comfort
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Perhaps you’ve heard the oft-cited African proverb: “It takes a village to raise a child.” Passivhaus is similar; it takes a whole team to successfully deliver a passivhaus project. The Passivhaus Standard requires an integrated approach to design so everyone on the team needs to be involved and to play their part.

Structural engineers need to design structure integrated with, not compromising, the thermal envelope. Building services engineers need to design the building as a whole system not as discrete items of equipment added to a building. Architects need to be aware of building services and structure and how they integrate as elements of the architecture. The passivhaus designer needs to be aware of the building shape, form, structure, services, physics and more. And the list goes on; the team of professionals working closely together on an individual passivhaus project can be quite extensive.

And looking beyond individual projects, passivhaus professionals share many common interests and goals. They want to deliver buildings that live up to their promises. They want to help tackle climate change. And more often than not, they want to work together and help each other succeed. Whether it is on specific projects, at conferences, or on social media, passivhaus professionals are very active in honestly sharing mistakes, lessons learnt, best practice and latest developments. There is a very strong global passivhaus community.

Community is a reason to Love Passivhaus!

021 Love Passivhaus Community
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Architecture is often described as the combination of art and science. The role of art in architecture is understandably subjective and open to debate. However, what about the role of science in architecture?

Clearly buildings do obey the laws of science, as they must. And specifically, the structure and services of a building are calculated and designed using physics. Understandably, it is most often these areas of science that get expressed in architecture. We can see this, for example, in the structural expressionism of Santiago Calatrava or in the romanticised high-tech style of Richard Rogers.

Aside from structure and building services, however, does science inform architecture in any other ways? Perhaps not as often as it should! As I wrote about previously, design is central to passivhaus. And science is central to passivhaus design – at the macro level of form and orientation, and at the micro level of airtightness and thermal bridging.

Science is a reason to Love Passivhaus!

020 Love Passivhaus Science
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What is the fundamental purpose of a building?

Buildings serve several needs of society – primarily as shelter from weather, security, living space, privacy, to store belongings, and to comfortably live and work. A building as a shelter represents a physical division of the human habitat (a place of comfort and safety) and the outside (a place that at times may be harsh and harmful).
– Wikipedia

As you can see, comfort is fundamental to the purpose of a building. So why do we find it so hard to ensure our buildings are actually comfortable? Why does our ‘world-class’ architecture still fail to provide comfortable buildings to live, work, learn and play in? (Besides using far too much energy and emitting far too much CO2!)

The Passivhaus Standard is known as the world’s foremost building energy efficiency standard. And it is that, but it is also a comfort standard. After all, what is the point of a building being energy efficient (or low carbon for that matter) if it compromises the functionality and comfort of the people who use the building? Passivhaus buildings provide exemplary comfort for the occupants by maintaining a healthy comfortable temperature, by being quiet, by having fresh air and by being draught-free.

Comfort is a reason to Love Passivhaus!

019 Love Passivhaus Comfort
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