[Bldg-sim] eQUEST - Chilled Beams...

Norbert Repka nrepka at aeieng.com
Mon Mar 17 09:19:38 PDT 2008

Hi there,

I have a question regarding chilled beams in eQUEST. I read the
articles on the Bldg-sim web site and tried to confirm my approach but
the information there is very general and inconclusive:

My inputs according to the building design: Using IU in eQUEST
SA temperature = 48F (entered as zone entering min. supply temp.)
AHU CHW loop temperature = 42F (created a primary loop)
CB CHW loop temperature = 57F (created a secondary loop based on the
gpm - % to primary)
Room set point temp. = 75F

Getting an error message:
C coil leaving temp. must be at least 6F higher than entering water

- Is the “zone entering min. supply temp.” a temperature of air
coming from the AHU or it is a temperature anticipating the induction
ratio (such as induction ratio of 3, i.e. 1portion of air at 48F and
3portions of air at 75F >> (1*48+3*75)/4 = 68.25F ??? (Does IU treat the
SA as only air from the MUA / OA unit or does it treat the SA as the mix
of return air and OA)
- In the cooling tab is the CHW Coil Delta T a temperature related to
the CC of the AHU or CB ???
- It doesn’t allow a SA temp. lower than a CHW temp???


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