[Equest-users] User Expression for DHW heater type

[Bishop, Bill]

Hi Sam,
I’m not sure but I don’t think you can apply a default expression to any TYPE keyword – whether it’s for a DW-heater, a SYSTEM, a SCHEDULE etc.
One alternative is to create multiple DHW heaters, and modify the default expression for CAPACITY to vary with the value of #PA(“DHW_Type”), so that the types you don’t want to use have a .001 capacity.
Regards,
~Bill

William Bishop, PE, BEMP, BEAP, CEM, LEED AP
Senior Energy Engineer
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From: Equest-users <equest-users-bounces at lists.onebuilding.org> On Behalf Of samuel mason via Equest-users
Sent: Tuesday, October 20, 2020 10:53 PM
To: Equest Users Mailing List <Equest-users at lists.onebuilding.org>
Subject: [Equest-users] User Expression for DHW heater type

Hello,
I am trying to set up a user expression for the type of DHW heater in a project. When I use the symbolic index control shown below and add it directly into the equest interface, the model runs fine and the graphical interface shows the correct heater type.

However, when I save the model, the INP file does not get written with the #SI notation and when I reload the model, it crashes while loading the BDL right when it gets to the DW-heater. Does anyone know how to get around this?

Snippet:
TYPE =
{IF(#PA("DHW_Type")==1) THEN
#SI("GAS","DW-HEATER","TYPE")
ELSE IF (#PA("DHW_Type")==2) THEN
#SI("ELEC","DW-HEATER","TYPE")
ELSE IF(#PA("DHW_Type")==3) THEN
#SI("HEAT-PUMP","DW-HEATER","TYPE")
ELSE
#SI("GAS","DW-HEATER","TYPE")
ENDIF
ENDIF
ENDIF}

DHW_Type is a global parameter of type numeric.

I also tried putting this code into the default for the DW-heater with a user expression and this also crashes when trying to load the BDL.

Thank you in advance.

Sam


Sam Mason P.E., LEED AP BD+C, BEMP
Principal
Encompass Energy, LLC
P: 443-410-1534
E: sam.mason at encompassenergyLLC.com<mailto:sam.mason at encompassenergyLLC.com>
W: www.encompassenergyLLC.com<http://www.encompassenergyLLC.com>

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