Passivhaus overheating shouldn’t happen: it’s one of the criteria of the international Passivhaus standard.
Even so, people sometimes ignore this requirement during the early stages of the design process.
It shouldn’t be ignored. Overheating is a key design issue and should be addressed from the beginning as an integral part of the Passivhaus design process.
But how?
This blog post is a simple guide to preventing Passivhaus overheating by design.
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!
This blog post is a review of “PHPP Illustrated: A Designer’s Companion to the Passive House Planning Package” published in October 2014. Sarah Lewis, architect and Certified European Passivhaus Designer wrote this delightful and chunky volume.
The Passive House Planning Package (PHPP) can seem like a monster spreadsheet at 30+ worksheets (tabs). And the last thing most architects would consider a ‘design tool’. However, once architects understand passivhaus and start to design passivhaus buildings, they quickly realise that the passivhaus spreadsheet PHPP is an essential element of the design process. For without the PHPP there would be no passivhaus buildings as Dr Wolfgang Feist writes in the foreword:
Behind the success of the [Passivhaus] Standard lies the Passive House Planning Package (PHPP), the Passive House energy balance and design tool. A tool of proven accuracy and demonstrated reliability in predicting building energy consumption…
The next step up is to gain enough understanding and fluency with the PHPP to fully integrate it as a passivhaus design tool. And that is where the strength of this book lies for passivhaus architects.
Sarah guides the reader towards fluency with the passivhaus spreadsheet PHPP using three key tools throughout the book:
Camden Passivhaus, the first certified passivhaus building in London UK, is used throughout the book to give real-world context each step of the way. It is also a seminal bere:architects passivhaus project and one that Sarah worked on previously while as a Director of the practice.
An unfamiliar tool can appear as an obstacle to design. Once understood and put into practice it can powerfully inform and support design decision making.
This blog post is a review of “Passive Houses: Energy Efficient Homes” published in March 2012. Chris van Uffelen, who compiled this monograph, is a prolific author with over 50 architecture and design related titles to his name
showcase the great variety of exciting and at the same time sustainable architectural solutions.
I first heard of this book when Murray Durbin mentioned it during his interview on the Home Style Green podcast. Murray and Lee Ann Durbin had found this book to be a particular inspiration when setting out to design their own residential Passive House in Auckland, New Zealand. They have written extensively about the process and you can see pictures of the completed residential Passive House on their blog.
It is a well-deserved recommendation. This book covers an enormous geographic and climatic range, and it showcases a wide variety of architectural styles and approaches to energy efficient homes.
“Passive Houses: Energy Efficient Homes” includes houses from the USA, Canada, England, Wales, Germany (as you would expect!), Austria, Switzerland, several Scandinavian countries, Australia, China, Japan and more. The author didn’t limit the choice to only certified residential Passive Houses, but instead selected inspirational energy efficient homes demonstrating a whole range of standards, all employing ‘passive’ techniques of one sort or another.
Out of the 56 homes showcased, at least 18 are certified to the European Passive House Standard and 6 to the Swiss Minergie Standard, which is very similar. Many examples meet a different standard such as the Califorina Green Building Standards Code, KfW40 (a German low energy standard), Energy Star and the UK’s Code for Sustainable Homes Code 6. There are also some certified to multiple complimentary standards. For example the Prescott Passive House in Kansas City, USA, is Passive House certified and also LEED Platinum.
This blog post is a review of “The Passivhaus Handbook” published in October 2012. The authors wrote and compiled this practical handbook for anyone who wants to be involved in delivering ultra-low energy housing. Janet Cotterell and Adam Dadeby were the architect – client team for the Totness Passivhaus B&B, the third retrofit in the UK to be certified to the Passivhaus Standard. Following their work together on the B&B they formed Passivhaus Homes and subsequently wrote The Passivhaus Handbook.
The Passivhaus Handbook is:
…intended to provide knowledge of both the methodology and the skills needed to achieve genuinely low-energy buildings, whether new or retrofitted, that perform as intended.
While passivhaus is not just for houses, The Passivhaus Handbook really is the ‘bible’ for developing passivhaus housing, particularly if you are thinking of a self-build passivhaus. The authors give substantial background into the “how and why of passivhaus” and then hold your hand through the whole process of a project. There is valuable guidance on setting up a passivhaus project, particularly applicable to self-build passivhaus, and then key practical aspects of a passivhaus project are each given a chapter. The book wraps up with chapters on living in a passivhaus, illustrated with four case studies, and a chapter specifically about UK policy.
