I'm running a baseline case to compare to my more complicated model.
This model is completely generated in the SD wizard - now I've added a
DOAS supply per the "standard" workaround: add a dummy space, dummy
zone and system for that dummy zone Pak Var vol Var temp. Edit the inp
to put the DOAS first and then change the 4pipe FC to use the DOAS to
supply OA. This baseline case runs just fine through the loads and
then locks up my windows 7 machine - have to power-cycle it. I've
added it twice and the problem is repeatable. When I implement this
same work around in a much more complicated model it doesn't crash so
I think I've done it correctly but I'm not sure what to do at this
point. .pd2 and .inp attached - Any suggestions would be welcome.
Thank you,
Jason
Warnings at the end of the .sim file are:
**WARNING**********************************************************************
ZONE dummy zone
might have insufficient heating capability.
Check that the SYSTEM or ZONE HEATING-CAPACITY plus this
ZONEs BASEBOARD-RATING is adequate to maintain the ZONE
specified DESIGN-HEAT-T for the calculated peak ZONE load
(see LS-A or LS-B for the ZONE peak load.)
SYSTEM DOAS
which supplies the above listed ZONE, has a design heating
coil exit temperature, HEAT-SET-T,(plus any zone reheat)
below its MAX-SUPPLY-T or the ZONE DESIGN-HEAT-T, which
might account for the insufficient heating capability.
ZONE dummy zone has a THERMOSTAT-TYPE
of REVERSE-ACTION, which, when added to the issues listed
in the messages above, will cause excessive underheating.
**WARNING**********************************************************************
DOAS defined as an OA-FROM-SYSTEM
has OA flow requirement of 69286. CFM
But its calculated/specified SUPPLY-FLOW is only 10. CFM
Its SUPPLY-CFM has been reset to meet requirement, however it is
strongly recommended you re-run with this SUPPLY-FLOW specified.
**WARNING**********************************************************************
DOAS defined as an OA-FROM-SYSTEM
has OA flow requirement of 69286. CFM
But its calculated/specified minimum SUPPLY-FLOW is only
10. CFM
Its MIN-FLOW-RATIO has been reset to meet requirement, however it
is strongly recommended you re-run with this
MIN-FLOW-RATIO specified.
**WARNING**********************************************************************
In the Southern hemisphere, the daylight savings start date
should be later than the end date. If the latitude is taken
from the weather file, you must manually specify the
daylight savings interval in the SITE-PARAMETERS component.
**CAUTION**********************************************************************
In curve: DX-Bypass-Factor-fAirFlow the dependent value
is exceeding the limits.
Value/Min/Max/First time: 1735581.875 -1000000.000
1000000.000 1/ 1/ 1
**WARNING**********************************************************************
Energy-recovery ventilator: DOAS has
frost on the exhaust outlet. First occurrence: 1 1 4
OA T&W: 52.0 0.0051 Return T&W: ***** 0.0000
**WARNING**********************************************************************
Energy-recovery ventilator: DOAS has
frost on the OA outlet. First occurrence: 1 1 4
OA T&W: 52.0 0.0051 Return T&W: ***** 0.0000
It crashed for me too. I made 3 changes to the file -- one of which
fixed it:
- in the dummy zone the OA was forced to 0 -- I reset this to default
(OA must pass through the dummy zone -- sort of.)
- the DOAS type was PVVT -- I set the fan minimum flow rate to 1.
but the one that fixed it:
- the DOAS fan does not have a flow rate -- give it an initial value,
even something low like 5000cfm and it will increase it up to the OA
required (~69,000 cfm). -- check the SV-A report. Once it runs once you
can set the actual OA value in the fan volume.