[EnergyPlus_Support] Re: Bug/Problem report, ContFanCycComp will cause error.

["don_shirey" <shirey@xxxxxxxxxxxxxxxxxx>]

The furnace documentation states that the heat/cool furnace and the
dx cooling coil need to have the same fan control designation 
(CycFanCycCoil or ContFanCycCoil) [I/O Reference Manual, page 514]:

"It should be noted that the volumetric air flow rate specified in
the direct air unit for the controlling zone should properly reflect 
the fractional volumetric air flow rate specified in the furnace 
object. In addition, the DX cooling coil operation mode must be 
specified consistently with the furnace operating mode (e.g., with
CycFanCycCoil for Furnace operating mode, the DX cooling coil 
operation mode must be CycFanCycComp)."

Because the fan control designation is contained in two different 
objects (heat/cool furnace and DX cooling coil), it is currently 
difficult for the program to trap a mismatch and issue a message that 
would clearly identify the problem.  However, we are planning to add 
data structures within the program that will allow "sharing" of 
information among various air-side components (objects). Among other 
benefits, these new data structures will allow better error trapping 
of improper inputs and allow for more helpful warning/error messages.


--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "waspoorboy" 
<mingsbox@e...> wrote:
> I don't know if I should call it a bug.
> Just want to share my discovery.
> ------------
> Description: If FURNACE:BLOWTHRU:HEATCOOL use CycFanCycCoil,
> but COIL:DX:CoolingBypassFactorEmpirical use ContFanCycComp,
> there will be a lot of warnings like the below:
> The reason I report this is because the error message didn't
> tell me I should use CycFanCycComp.
> I tried to correct the Air volume flow rate but doesn't help,
> and before I went to check the weather file to see if
> Temperature/Enthalpy wrong, I read Message#1228 and figure this out.
> The error message looks also similar to Message#1376,1384,1385
> which Linda and others suspect the problem might come from
> weather file.
> To reproduce this error, simply open FurnacewithDXSystem.idf
> and change CycFanCycComp to ContFanCycComp in 
> COIL:DX:CoolingBypassFactorEmpirical 
> When corrected back, the whole bunch of warnings are gone.
> Hope this discovery will help some users in the future.
> ========
> ** Warning ** COIL:DX:CoolingBypassFactorEmpirical 
> "FURNACE ACDXCOIL 1" - Air volume flow rate per watt 
> of rated total cooling capacity is out of range.
> ** Warning ** Enthalpy out of range (SATUTH).....
> ** Warning ** Temperature out of range.....
> ** Warning ** Calculated Humidity Ratio Invalid (PSYWTP).....
> ** Warning ** Calculated Relative Humidity out of range (PSYRHT)....
> **   ~~~   ** Relative Humidity being reset to .01
> ************* Psychrometric Error Summary
> *************  Routine - Number of errors
> *************    PSYDPT-0
> *************    PSYRHT-20
> *************    PSYTWD-0
> *************    PSYVTW-0
> *************    PSYWDP-0
> *************    PSYWTH-0
> *************    PSYWTP-242
> *************    PSYWTR-86
> *************    SATUPT-586
> *************    SATUTH-91
> *************    SATUTP-0
> *************    tp12c0-0
> *************    tp12c1-0
> *************    tp12h0-0
> *************    tp12h1-0
> *************    freeze-0
> ==========


------------------------ Yahoo! Groups Sponsor ---------------------~-->
Looking for the latest Free IT White Papers?
Visit SearchMobileComputing.com to access over 500 white papers.
Get instant access at SearchMobileComputing.com Today
http://us.click.yahoo.com/ZyjvfD/PLNGAA/uitMAA/dkFolB/TM
---------------------------------------------------------------------~->

To unsubscribe from this group, send an email to:
EnergyPlus_Support-unsubscribe@xxxxxxxxxxxxxxx

The primary EnergyPlus web site is found at:
http://www.energyplus.gov

The group web site is:
http://groups.yahoo.com/group/EnergyPlus_Support/

Attachments are not allowed -- please post any files to the appropriate folder in the Files are of the Support Web Site.




 

Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/