[BLDG-SIM] Introduction and Load Calculation Survey

Nick Doylend bldg-sim at ndoylend.fastmail.fm
Fri Aug 3 05:42:53 PDT 2007


Hi, I've recently subscribed to this list.  Perhaps I should introduce
myself briefly:  I'm based in the UK working within the concept design
and sustainability team of a building services engineering consultancy.
I use TAS as my main tool for thermal simulation.  I've also been using
Ecotect, Radiance and Daysim for solar & daylight analysis.  Hopefully
this list can help me keep up to date with current practice in the
industry as well as the academic world.

Recently I've been involved with some research into the calculation of
cooling and heating loads.  I'm concerned about the environmental and
economic implications that different calculation methods have.  For
example, uncertainly in a tool's accuracy (or the user's ability to
define the building and make appropriate assumptions) may lead to use of
excessive safety margins and oversized plant.

At this stage I'm particularly interested in identifying current
practice among UK building services engineers, as opposed to simulation
specialists, so I appreciate that this list may not be the most
appropriate place for my question.  If you know of any other discussion
lists or colleagues who would be able to answer these questions it would
be a great help if you could forward the survey on to them.

Load Calculation Survey

I'm investigating the current practice with respect to heating and
cooling load calculations.  I'd be very grateful if you could help me by
answering the following question:

What methods do you use, on a regular basis, to calculate loads for
plant sizing?

1) Manual/spreadsheet admittance calculation
2) CIBSE based design package (Cymap/Hevacomp)
3) Thermal simulation software (TAS/ApacheSim)
4) Published rules of thumb
5) Guesswork!
6) Other (please describe)

Thanks for your help!

Nick Doylend

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