Design metrics
The RIBA Passivhaus Overlay, published by the RIBA in 2022, states in relation to design metrics: “To inform the design process each building type and site will have an optimal range of useful Design Metrics, generally including, although not limited to, parameters such as form factor, glazing ratio, ventilation rate, length of intake/exhaust ductwork, internal gains etc. Each building typology has an optimal range of factors, ratios, rates etc. and thus early prototyping and options analysis by means of the PHPP model during RIBA Stages 1 and 2 helps the design team to identify and develop these metrics so that the design process can be expedited, costly redesign can be avoided, and construction budgets can be met.”
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