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[BLDG-SIM] Passive Chilled Beam Model with Dummy OA zone of SZRH
Hi
all
I am
using eQuest to try to model a Passive Chilled Beam system using a Dummy OA zone
of SZRH and Fan Coil Units in the zones.
I
specified the Dummy zone for only OA treatment without any internal loads, and
set COOL-CONTROL as CONSTANT,
COOL-SET-T as 59 oF(15oC). Because CB won't kick in
untill the room temperature is above 15oC with AHU.
There
is one AHU for the Dummy zone.
Then
for all the actual zones, I specified FC with OA-FROM-SYSTEM as dummy
zone.
There
is a sparated loop (chilled water temperature of 14oC supply and 17oC
return) defined for the FC.
As my
understanding you can remove the Fan energy of FC then the energy consumption of
FC will represent the actual loads for passive chilled beam. And the Dummy OA
zone of SZRH will deal with constant OA load.
Am I
right, anything I missed for the assuption.
My
problems are:
1)
warning message in SIM file saying "Preheat/heating-capacity is too low to
provide the requested supply temperature for the
calculated mixed air temperature...".
Although I used auto sizing for the heating capacity.
2) What is the
different impact if I specify the actual zones as FC from
IU.
3) I
did some test runs of FC and IU. The results indicated heating energy
consumption of IU was 10 times as FC.
4) The
test run of passive chilled beam shows the cooling and heat rejection energy
goes 50%, pump goes 25% up
than the conventional VAV. And Fan
became only 20% of the conventional VAV.
The result is quite different from
my expectation and some reference. I am expecting similar cooling and heat
rejection figure but
apporx 150% of pump, 50% of fan
energy than the conventional VAV.
Any
comments would be appreciated.
Thank
you in advance.
Kind
Regards,
Vickie
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