I’ve been geeking out over my gorgeous faux leather hard bound copy of the 2009 Ashrae Handbook – Fundamentals (SI units)
which recently arrived in the post. One of the perks of ASHRAE membership is an updated copy every year of one of the handbooks on a rolling schedule (something CIBSE have started to do too in recent years).
Anyway, in this year’s tome is a new chapter – Chapter 35 SUSTAINABILITY. Under ‘Characteristics of Sustainability’ is a clarifying few paragraphs on the difference between green and sustainable buildings. For reference:
Sustainability Addresses the Future
Sustainability is focused on the distant future (e.g., 30 to 50 years). Any actions taken under the name of sustainability must address the impact of present actions on conditions likely to prevail in that future time frame.
In designing the built environment, the emphasis has often been on the present or the near future, usually in the form of capital- or first-cost impact. As is apparent when life-cycle costing analysis is applied, capital cost assumes less importance the longer the future period under consideration.
This emphasis on the distant future can differentiate sustainable design from green design. Whereas green design addresses many of the same characteristics as sustainable design, it may also emphasise near-term impacts such as indoor environmental quality, operation and maintenance features, and meeting current client needs. This, green design may focus more on the immediate future (i.e. starting when the building is first constructed and then occupied). Sustainable design is of paramount importance to the global environment in the long-term while still incorporating features of green design that focus on the present and near future.
An interesting way to slice the problem, and makes me realise (by this definition, at least), most of the stuff that I am most interested in is green design, rather than sustainable design, occupant comfort being my raison d’etre. The chapter goes on to point out that HVAC&R engineers cannot by themselves create global sustainability (however, we all need to do our bit and encourage as many others as possible), and that sustainability has many contributors, is comprehensive and that technology plays only a partial role.
As green building rating systems continue to converge (BREEAM and LEED), I find a growing interest in keeping up to date with ASHRAE, which I have always found more ‘engineery’ than CIBSE (in that their technical guidance seems to have many more equations than CIBSE).
Given ASHRAE’s definition, which rating system is more sustainable (rather than green) – LEED or BREEAM? Something I’ll poder a while longer…
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