[BLDG-SIM] TEMP of air leaving cool coil in equest--A confusing result!

Brian Fountain bfountain at greensim.com
Sat Oct 6 12:56:50 PDT 2007

As for the chiller running year round - the default operating mode is
standby - that should be changed to either demand or snap on OAT -
otherwise your chiller runs whenever a system is running "just in
case" it needs cooling.



-----Original Message-----
From: BLDG-SIM at gard.com [mailto:BLDG-SIM at gard.com] On Behalf Of
Mingming Zuo
Sent: October 6, 2007 4:04 AM
To: BLDG-SIM at gard.com
Subject: [BLDG-SIM] TEMP of air leaving cool coil in equest--A
confusing result!


Dear all:


Hi, I modeled a VAVs in eQUEST recently and the parameters related are
summarized below:


 100% outside air for all the year

 for preheat coil, PREHEAT-T=48.2 F ;

 for central cool coil, COOL-SET-T=48.2 F and MIN-SUPPLY-T=60.8F;

 for chilled water loop, loop operation = demand only.

 no economizer and heat recovery.NO humidity control!


As in Shanghai, China, there are many hours when outside air dry bulb
temp will go below 48.2F, So I think no cooling from chiller is
needed.After simulation, I exmained hourly 


results report and found out the CHW loop ran all the year and TEMP of
air leaving cool coil is 46F. As no humidity control, in my opinion,
there is no need to lower coil temp.


Why are temps of air leaving cool coil driven below 46 F while no
cooling is needed?




Zuo Mingming

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