Re: [EnergyPlus_Support] Energy Balance

["Michael J. Witte" <mjwitte@xxxxxxxx>]

Are you interpreting "energy transfer" as the envelope heat transfer to/from 
the zone?  This is not what it represents.  The Energy Transfer meters are used 
for various HVAC system energy flows.  See the meter details (mtd) output file 
for a list of specific report variables that are accumulated on a given meter.  

There are no report variables available for the envelope contribution to the 
zone load.  The list of variables here are heat *gains*, presumably all 
components except the heat transfer through opaque surfaces.  The HVAC system 
meets heating/cooling *loads*, and portions of the gains become loads 
significantly later due to thermal mass.  Comparing over a daily basis helps, 
but not all gains become a load.  

If you want to confirm the physics and calculate the opaque surface heat 
transfer, then the only accurate way is to set up a steady-state design day and 
use UAdeltaT to calculate the surface heat transfer.

Mike


On 25 Aug 2005, at 19:11, Ali_Ajmi wrote:

> Hi All,
> I tried to balance the energy that losses in the North zone, in my five zone
> building, and energy needed by the system and gain by the solar to cover that
> losses. The report and meter variables that shown below shows that the energy
> transfer out of the zone in the first day of January too high comparable to the
> energy should be compensated the loss by the heating coil, people, lighting. A
> short list for  the variables that I used to do this analysis is below. could
> any one figure out which variable I may missed or error of value conversion from
> W to J.
> 
> ZONE NORTH:Zone Window Heat Gain[W](Daily)
> 
> ZONE NORTH:Zone Window Heat Gain[J](Daily)
> 
> ZONE NORTH:Zone Window Heat Loss[W](Daily)
> 
> ZONE NORTH:Zone Window Heat Loss[J](Daily)
> 
> ZONE NORTH:People-Total Heat Gain[J](Daily)
> 
> ZONE NORTH:Electric Eq-Total Heat Gain[J](Daily)
> 
> ZONE NORTH:Cat00 Electric Eq-Total Heat Gain[J](Daily)
> 
> ZONE NORTH:Infiltration-Sensible Heat Loss[J](Daily)
> 
> ZONE NORTH:Infiltration-Sensible Heat Gain[J](Daily)
> 
> EnergyTransfer:Zone:ZONE NORTH [J](Daily)
> 
> 6.67E-01
> 
> 2.40E+06
> 
> 1.57E+03
> 
> 8.64E+12
> 
> 1.09E+08
> 
> 8.48E+07
> 
> 8.48E+07
> 
> 1.62E+08
> 
> 0.00E+00
> 
> 1.15E+08
> 
> Thanks in advanced 
> 
> Ali
> 
> 
> 
> ---------------------------------
> How much free photo storage do you get? Store your holiday snaps for FREE with
> Yahoo! Photos. Get Yahoo! Photos
> 
> [Non-text portions of this message have been removed]
> 
> 
> 
> 
> 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@xxxxxxxx




------------------------ Yahoo! Groups Sponsor --------------------~--> 
Fair play? Video games influencing politics. Click and talk back!
http://us.click.yahoo.com/T8sf5C/tzNLAA/TtwFAA/dkFolB/TM
--------------------------------------------------------------------~-> 

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

<*> To visit your group on the web, go to:
    http://groups.yahoo.com/group/EnergyPlus_Support/

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

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