[Equest-users] Changing DHW Schedule Does not Change the Gas Consumption

[Brian Fountain]

I am not aware of a general issue with DHW in eQUEST with regards to the schedules so I suspect it is a project specific issue – at which point sharing the .inp may be helpful.  I have been surprised at the impact of the UA value in the DHW heater on the heater’s efficiency, but as the loads change, the natural gas input will also.

Quick checks:

-          Are the schedules linked as you expect? Daily->weekly->annual->DHW Loop Process Load

-          Are the changes being masked by other gas uses?  i.e. check the PS-H report in the .sim for the DHW heater – is the load and response there changing?

-          Check the Process T of your DHW loop.  If it is lower than the DHW loop temperature, the DHW flow is “mixed” at the tap with the incoming water temperature reducing the DHW loop flow.  Perhaps this is set much too low?

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Brian

From: Equest-users <equest-users-bounces at lists.onebuilding.org> On Behalf Of Ahmad Fraij via Equest-users
Sent: Monday, September 27, 2021 3:51 AM
To: Fraij via Equest-users <equest-users at lists.onebuilding.org>
Subject: [Equest-users] Changing DHW Schedule Does not Change the Gas Consumption

CAUTION: EXTERNAL SENDER
Hello Guys,

I am changing the fraction in the Domestics Hot Water (DHW) schedules in eQUEST but the gas consumption is not changing. Does anybody encountered something like that?

I spent a lot of time trying to fix it but I could not. Your help will be highly appreciated.

Thank you.

Ahmad
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