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

[Brian Fountain]

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

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Brian Fountain
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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
[cid:image001.png at 01D6AD09.1D6F4270]
PS-F for EM2
[cid:image002.png at 01D6AD09.1D6F4270]

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







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