Dear all,
I often do loads, and I have not had this question before. Now I have a
debate with my co-worker.
The LEED and ASHRAE 90.1 say that every solar exposure has to have a
separate control zone. I agree. But ...
I usually model a room with different exposures as one zone if it is
different from other rooms or attach this room to a zone with the exposure
that has more influence ( if room has South and West walls, I attach to a
zone with similar usage rooms with south exposure). And my co-worker says
that LEED asks to submit a plan with properly modeled zones which have to
have their own control.
The question is
Do I have to assume 2 zones for a room with 2 different exposures or I still
can model as one zone with one control.
With best wishes,
Genia Gorbachinsky
Genai:
?
I don't do much LEED. But don't you set up the model in the way it is actually zoned? A single zoom would not have two thermostts.
Evgenia,
The eQUEST Tutorial has a good discussion of zoning in it. Std 90 requires a
perimeter/core zoning pattern at least.
John is correct to point you to mechanical system zones, but there are times
that you won't need to put each and every zone in. An example of one of them
is a multi-family building with a number of units on each exposure. They can
be combined into a thermal block, as discussed in Table G3.1 of Standard 90.
When you use this type of zoning each corner unit is typically handled as a
separate zone since they have 2 exposures.
I hope that answers your question. Zoning is very important and can make or
break your model.
Best,
Carol