What does DfMA stand for?).
This is a combined target and is based on the energy consumed by building systems and the renewable energy generated by building mounted wind, photovoltaics or solar thermal systems.. For the above reasons, Passivhaus is a suitable standard for clients and developers that seek a well-established, sustainability standard to deliver low energy buildings with the highest construction quality, aspiring to net zero carbon in operation.. Bryden Wood’s 10-step approach to Passivhaus building design and construction.Whilst there is no fixed formula to Passivhaus, Bryden Wood proposes the achievement of the above targets via the following 10 steps, which relate both to design decisions and construction specifications for improved sustainability:.
A compact shape with low building envelope to volume ratios.. Building orientation to benefit from useful solar gains.. Optimised window sizes to capitalise on useful solar gains, reduce heat losses and deliver exemplary levels of natural light into the building..Highly insulated walls, floors and roofs.. Site specific shading to mitigate summertime overheating, whilst allowing winter solar heat gains.. High performance triple glazing with thermally bridge- free heads, jams and sills.. A thermal bridge-free building via detailed design of junctions, and clear and easily buildable air seal lines, to deliver the specified air permeability..Mechanical ventilation with heat recovery (MVHR) and low-pressure loss duct systems to minimise heating demand..
High-performance air source heat pumps for heating and DHW.. Renewable technology, including building mounted photovoltaics, solar thermal or small-scale generators and consider the use of battery storage for improving payback periods of building mounted renewables..Recommended design measures for the achievement of Passivhaus performance.
What are the benefits and challenges of adopting Passivhaus?.
These are the main benefits of adopting a Passivhaus standard:.The idea that the purpose and objective can be captured in a document and then a design team (human-intelligent-machine) can simply deliver it, is as frightening as the robot childminder.. For Design to Value the rules should be:.
Altruism – the aim should be to maximise the value to the client, understanding the underlying purpose.Uncertainty – the problem statement and value drivers should remain uncertain.
Iteration – there needs to be a dynamic process: try, analyse, evaluate.Professor John Dyson spent more than 25 years at GlaxoSmithKline, eventually ending his career as VP, Head of Capital Strategy and Design, where he focussed on developing a long-term strategic approach to asset management..