[EnergyPlus_Support] Re: A problem of Sensible Heating/Cooling Rate

["hbn_pch" <hbn_pch@xxxxxxxxxxxx>]

Dear all:
  Thanks for Mike's kind reply.
  I have searched the document and find it just lists the name of the 
variables.There is no specification in the document.
  For convenience,I list the values for the whole day in 14th,Jan.
I use Space-1 for instance.From 1am to 7am,the Zone/Sys Cooling Rate 
values are:210w,217w,220w,215w,218w,219w,208w.The Zone/Sys Heating 
Rate values are 0.At 8am,The Zone/Sys Heating Rate value is 2519w,and 
the Zone/Sys Cooling Rate is 0.At 9am,The Zone/Sys Heating Rate value 
is 167w and the Zone/Sys Cooling Rate  value is 62 w.For the remainer
hour,the Zone/Sys Cooling Rate value 
are:517w,558w,574w,525w,550w,591w,573w,546w,542w,457w,381w,318w,270w,2
29w,217w,0w.And The Zone/Sys Heating Rate value is 0.
  Then problems come:
Problem 1:Why there is only Zone/Sys Cooling Rate during 1am to 7am?  
And during 1am to 7am,the Zone/sys Air Temp values increase a little 
sometimes,if the Zone/sys Air Temp increase,The Zone/sys Heating Rate 
value must be positive?

Problem 2:Why the the Zone/Sys Heating value is so big?

Problem 3:Why the the Zone/Sys Heating and The Zone/Sys Cooling Rate 
exist simultaneous and the values is so small?

Problem 4:Why there is only Zone/Sys Cooling Rate during the remainer 
hours.And in front hours of the remain,the system is on its occpuied 
period,but the Zone/Sys Heating Rate value is 0.Why?

  Thanks for all your kind help!
  pch
   


--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "Michael J. Witte" 
<mjwitte@g...> wrote:
> The Zone/Sys Heating/Cooling report variables are described in the 
Input Output 
> Reference, as are most report variables.  Search the docment for 
the variable 
> name to find a description.
> 
> In this simulation, the thermostat has a setback schedule, so that 
is why the 
> zone temperatures are cool in the unoccupied period.  Also, during 
winter, the 
> system has been scheduled to run the fan around the clock.  The 
minimum outside 
> air schedules is set to 2% during unoccupied hours, so the system 
always brings 
> in some fresh air.  During the hours that you refer to that show 
values for 
> Zone/Sys Sensible Cooling, the system is cooling the space because 
the mixed 
> air is cooler than the zone air.  Remember that the zone/sys 
heating/cooling 
> variables indicate what the system delivered to the zone, not what 
the coils 
> are doing.
> 
> Mike
> 
> 
> On 5 Nov 2004, at 3:09, hbn_pch wrote:
> 
> > 
> > 
> > Dear all:
> >   I start a simulation of the example of 5ZoneEngChill.idf 
attached 
> > to the EnergyPlus.
> >   For analysis,I add a boiler parameter of Boiler Gas Consumption 
> > Rate in the report parameter.I discover that there is only 
Sensible 
> > Cooling Rate values from 1am to the 7am.But at 8am there is only 
> > Sensible Heating Rate values,and these values are very 
big.Whereas,in 
> > 9am,Sensible Cooling Rate value and Sensible Heating Rate value 
exist 
> > simultaneous and the two values are very small.For remainder 
> > hours,there is Sensible Cooling Rate only.
> >   From 1am to 7am,the Zone/Sys Air Temp values are approximately 
> > 17C,and from 8am to 6pm the Zone/Sys Air Temp values are 
> > approximately 21C.Then the Zone/Sys Air Temp values decrease by 
hour.
> >   So I'm puzzled.I can't find the reasonable explain.I even did't 
> > know what do Zone/Sys Heating/Cooling Rate and Zone/Sys Air Temp 
mean.
> > 
> >   Thanks for all your kind help!
> >   pch
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 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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