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How can I create a virtual load to activate supply side of plant?

asked 2020-12-04 01:20:42 -0500

Babak's avatar

updated 2020-12-04 14:28:53 -0500

I need my plant loop pumps to circulate the working fluid during some hours with no actual load. I need this to charge the thermal storage tank during no-load conditions. Thermal storage is placed after the chillers mixer and chillers are controlled by cooling load based operation scheme. Also, my plant loop has no common pipe and has HeaderedPumps:ConstantSpeed in the supply inlet branch.

I considered LoadProfile:Plant but there are two problems with that. First, it affects the sizing of the pumps and chillers which is unfavorable. Second, I need chillers to operate based on load and PLR not based on flow requests. Do you have any suggestions to fix these issues (common pipe, ems, user-defined component etc)?

Update: Here is a visual perspective and an additional explanation about the virtual load [Ref]:

image description

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Have you tried an AvailabilityManager:Scheduled or AvailabilityManager:ScheduledOn?

Julien Marrec's avatar Julien Marrec  ( 2020-12-04 09:21:27 -0500 )edit

@Julien Marrec, Where should I use it? I didn't get your point.
Actually, I got the idea of the virtual load from a paper. I add some screenshots if it helps.

Babak's avatar Babak  ( 2020-12-04 13:38:12 -0500 )edit

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answered 2020-12-05 23:10:09 -0500

updated 2020-12-05 23:11:47 -0500

Here is a solution my friend. After autosizing components in the plant loop that you intend to use your virtual load, replace autosized loadprofile:plant would not affect component sizing. The second problem I think is handled by the load distribution of the energyplus. You just have to set a binary value for load and maximum flow rate (pump size) for the flow of theloadprofile:plant. Then using ems you can turn off the pumps when the chiller PLR is zero.

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Asked: 2020-12-04 01:20:42 -0500

Seen: 83 times

Last updated: Dec 05 '20