[EnergyPlus_Support] Re: Heating:Electricity

["beyangj" <beyangj@xxxxxxxxxxx>]

Dear Mike,

Thank you very much for your help. Yes, my input file is 2e3102 as 
you mentioned before. I don't know which is the exact value of the 
peak design cooling load, and I want to know which is the reasonable 
value for the VAV "Zone Minimum Air Flow Fraction"  fields, could 
you tell me? How can I set the the schedules for the reheat coils 
and boiler and let them work properly? 

Moreovr, I have some problems about the SimAirLoops: Maximum 
iterations exceeded for VAV SYS 1. I just downloaded the newest 
version of EnergyPlus (1.2.1) today and installed it. I run my input 
file(2e3102) and the ERR output file gave warnings as follow:
  ** Warning ** Version in IDF="1.2.0" not the same as 
expected="1.2.1"
   ** Warning ** Requested Sizing for Zone="CORE", Zone is not found 
in the Controlled Zones List
   ** Warning ** Requested Sizing for Zone="RFCORE", Zone is not 
found in the Controlled Zones List
   ** Severe  ** Deprecated Object -- Coil:Water:SimpleCooling.  
Please use Coil:Water:Cooling.
In my model, the zones of CORE and RFCORE aren't served by the 
systems, but it gave the warnings for requesting sizing for these 
two zones, and is it necessary?
I changed the version for 1.2.1,and I substituted Coil:Water:Cooling 
for Coil:Water:SimpleCooling, and the input file was run again, the 
ERR output file gave warnings as follow:

   ** Warning ** SimAirLoops: Maximum iterations exceeded for VAV 
SYS 1, at HONG KONG CHN IWEC DATA WMO#=450070, 01/10 08:17 - 08:18
   ** Warning ** SimAirLoops: Maximum iterations exceeded for VAV 
SYS 1, at HONG KONG CHN IWEC DATA WMO#=450070, 01/10 08:18 - 08:19
   ** Warning ** SimAirLoops: Maximum iterations exceeded for VAV 
SYS 1, at HONG KONG CHN IWEC DATA WMO#=450070, 01/10 09:34 - 09:36

 <snip>
   ** Warning ** SimHVAC: Maximum iterations exceeded for all HVAC 
loops, at HONG KONG CHN IWEC DATA WMO#=450070, 12/20 18:00 - 18:15
   ** Warning ** SimAirLoops: Exceeding max iterations 
continues...2500
   ** Warning ** SimAirLoops: Exceeding max iterations 
continues...2550

I don't know why this happened. Could you kindly help me?

Best Regards,

Stewart


 


--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "Michael J. Witte" 
<mjwitte@g...> wrote:
> I am assuming this is the same input file that we were looking at 
last month 
> (2e3102.imf).  This mode is a VAV system serving 16 zones with hot 
water reheat 
> coils served by an electric boiler.  The VAV "Zone Minimum Air 
Flow Fraction" 
> fields are all set to either 0.3 or 0.5, and the reheat coils and 
boiler are 
> scheduled to be on at all times the fan system operates.  So, 
whenever a zone 
> sees a cooling load below 30% (or 50%) of the peak design cooling 
load, the 
> reheat coil will come on to prevent overcooling.
> 
> Mike
> 
> 
> On 3 Oct 2004, at 5:57, beyangj wrote:
> 
> > 
> > 
> > Dear,
> > 
> > The building in my IDF file is located in Hong Kong, but the 
> > simulation results showed  that the Heating:Electricity was 
needed 
> > all the year round.Especially, the amount of Heating:Electricity 
in 
> > January was 1.08E+11 J, but that in July was 1.55E+10 J. In 
summer, 
> > the temperature in Hong Kong is very high, so there should be no 
> > need for heating. I don't know why this happened. Could you 
kindly 
> > help me?
> > 
> > Best,
> > 
> > Stewart
> > 
> > 
> > 
> > 
> > 
> > 
> > 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 area of the Support Web Site.
> > 
> > Yahoo! Groups Links
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> 
> 
> 
> ========================================================
> Michael J. Witte, GARD Analytics, Inc.
> EnergyPlus Testing and Support      
> EnergyPlus-Support@g...





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