[Equest-users] Why the metered energy consumption is two times higher than the energy consumption reported by PS-H

[Yongqing]

Hi,Brian


I revised the model to set the chilled water loop control option to "standby".But in my current model,the problem still existed.


If I remove the heat storage, hourly report indicates that heating of the loop to loop heat pump was doubled in very few time steps.




Howerver,more strangely,if the heating storage system was modeled,at some time step,even if the Elctricity use for heat pump is 0,the ELEC-METER also reported heating energy use.






At 2020-10-28 21:04:14, "Brian Fountain" <Brian.Fountain at sa-footprint.com> wrote:

There is indeed a bug that causes the input electricity for loop-to-loop heat pumps in heating only mode to be doubled.  The PS-C/PS-H reports show the correct electrical energy but that value is doubled in the BEPU/PS-F/ES-D reports.  It is only the heating energy (cooling reports correctly) and only occurs when the loop-to-loop heat pump is in heating only mode with no assigned cooling load. 

 

The problem can be avoided by setting the chilled water loop control option keyword to “standby” rather than “demand”. 

 

Interestingly, adding a process load to the cooling loop does not resolve the issue but instead causes the heating only load to be reported twice – once under heating end use and a second time under miscellaneous.

 

Compliments to Eric Rubli of our office for identifying the loop control solution.

 

B

 

Footprint

Brian Fountain
Associate
d 416 572 8501 m 416 562 6831

 

From: Equest-users <equest-users-bounces at lists.onebuilding.org> On Behalf Of Yongqing via Equest-users
Sent: October 26, 2020 10:54 AM
To: equest-users <equest-users at lists.onebuilding.org>
Subject: [Equest-users] Why the metered energy consumption is two times higher than the energy counsumption reported by PS-H

 

CAUTION: EXTERNAL SENDER

I am woriking on a project that served by loop to loop heat pump.However, when I model it in eQUEST, a very strange probem occured,which is the electricity consumption metered by ELEC-METER is two times higher than the one reported by PS-H.Below is the output screenshot:

PS-H report

PS-F for EM2

 

The electricity meter is only attached to loop to loop heat pump.

 

 






 
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.onebuilding.org/pipermail/equest-users-onebuilding.org/attachments/20201029/1d4e7152/attachment.htm>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image.png
Type: image/png
Size: 49407 bytes
Desc: not available
URL: <http://lists.onebuilding.org/pipermail/equest-users-onebuilding.org/attachments/20201029/1d4e7152/attachment-0010.png>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image.png
Type: image/png
Size: 33647 bytes
Desc: not available
URL: <http://lists.onebuilding.org/pipermail/equest-users-onebuilding.org/attachments/20201029/1d4e7152/attachment-0011.png>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image.png
Type: image/png
Size: 33682 bytes
Desc: not available
URL: <http://lists.onebuilding.org/pipermail/equest-users-onebuilding.org/attachments/20201029/1d4e7152/attachment-0012.png>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image001.png
Type: image/png
Size: 65764 bytes
Desc: not available
URL: <http://lists.onebuilding.org/pipermail/equest-users-onebuilding.org/attachments/20201029/1d4e7152/attachment-0013.png>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image002.png
Type: image/png
Size: 62231 bytes
Desc: not available
URL: <http://lists.onebuilding.org/pipermail/equest-users-onebuilding.org/attachments/20201029/1d4e7152/attachment-0014.png>