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Passivhaus vs. Creativity?
Let’s Talk About the Issues
Standard
Airtight
Pioneering
Physics
MVHR
High performing
Precise
Energy
Comfort
On-site monitoring
Criteria
Third-party certified
Cost
Let’s Talk About the Issues
Standard
Airtight
Pioneering
Physics
MVHR
High performing
Precise
Energy
Comfort
On-site monitoring
Criteria
Third-party certified
Cost
Comfort – our responsibility
Energy – is Passivhaus necessary?
Source: Passivhaus Trust, 2019
The Good Stuff
• Informed decisions
• Bottom up approach
• On site monitoring and third party certification
• Energy resilience
• Simplicity of use and function
The Challenges
• Aesthetics and pull towards box-like buildings
• Inherent difficulty in achieving desirable spaces, particularly upper floor externals
• Design and construction rigour
• Early design/Design cost
• Lacking widespread skills
Croft Gardens, Cambridge
Passivhaus design requirements were made part of the project at an early stage Another design complexity, among others Brownfield, semi-urban site added further design constraints, including: - Acoustics - Orientation - Cost - Planning - Landscape
Croft Gardens, Cambridge
Design ‘work’
Design for airtightness
Higher levels of thermal performance
Some material limitations
Quality of detailing
More intensive focus on cold bridging
Quality of workmanship
Design ‘challenges’
Care not to move too far into a diluted ‘fabric first’ approach – needs to work with MEP systems and building as well
Harder to gain recesses / façade modelling
Limitations of products
Orientation
Working closely with the idea of windows in wall
Don’t forget the ‘other’ stuff!
Design positives
Mass, solidity, tends toward simple forms
Can use alternative products but need to additional work
Clarity of ‘zones’ and ‘lines’ within fabric has benefits in construction
Resilience of design
Design with quality, hopefully for longevity
Simplicity
Kellogg College, Oxford
Lessons learnt
Simple form
Maximised orientation
Challenges of rooflights
Terminations to air in brickwork
Strategic detailing – relationships, positioning and consistency
Thermal efficiency
Style vs. Function?
Passive design does not replace architectural design
Challenges in making
New skills – understanding airtightness, thermal performance and bridging.
Materials and products
Importance of sharing process with teams
“I have never been forced to accept compromises but I have willingly
accepted constraints.” -Charles Eames
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