[BLDG-SIM] Performance Metrics

["Mark E. Case" <mcase@xxxxxxxxxx>]

We have been involved locally with trying to use ASHRAE 90.1, both 1989 and 1999 as a metric in new building design - i.e., `xx% better than code minimum' for both LEED compliance and for a State buildings program. I know there are a number of similar programs and initiatives throughout the country. I am also slated to give a presentation on "Issues Around Using ASHRAE 90.1-1999 as a Metric" at the ASHRAE Annual meeting in June (Seminar 28).

I'm looking for two things - first what experiences have people had with `exceeding' the code by x%? I've heard rumors that a reputable simulation firm said 35% can't be done if you strictly interpret the code. LEED provides credit for 40% and 50% improvements. We've been using a completely arbitrary target of 35%, which with a little  c o d e  stretching seems to be obtainable. What is realistic based on your experience?

Second, I would like to get some feedback on the whole `using 90.1 as a metric` issue that I might include in my presentation to round it out a little.

Any feedback would be appreciated and of course I would credit anything I used in the Seminar.

Mark E. Case, P.E.
etc Group, Inc.

 

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