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[FEATURE] PiecewiseEffects for Flows #300
Description
Prerequisite Checks
-
I have searched the existing issues and confirmed this feature doesn't already exist.
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I have checked the documentation to ensure this feature isn't already available.
Is your feature request related to a problem?
At the moment I'm not able to model the piecewise (in reality non-linear) relationships between flows and effects.
Describe the solution you'd like
I would like to use PiecewiseEffects in Flow:
flixopt.Flow( ... , effects_per_flow_hour=flixopt.PiecewiseEffects( ... ))
Energy System Use Case
I try to implement pressure losses for transmission objects on a very simplified basis. The pressure loss of a pipe is non-linear in respect to the flow in the pipe. To represent the pressure loss more precisely, I would like to use PiecewiseEffects.
Desired Code Example (optional)
# example with pressure losses, which my_effect takes into account
my_piecewise_effect = fx.PiecewiseEffects(
piecewise_origin=fx.Piecewise(flow_list),
piecewise_shares={my_effect.label: fx.Piecewise(pressure_loss_list)},
)
flixopt.Flow( ... , effects_per_flow_hour=my_piecewise_effect)Component Category (if applicable)
Network/Grid (transmission, distribution)
Alternatives considered
No response
Additional context
No response
Activity
FBumann commentedon Sep 4, 2025
@JonaGL Thanks for your request.
We will work on this.
It might also be possible to use a linear Transformer with
fx.PiecewiseConversioninstead.This would lead to the losses being accounted for in a Flow (with a connected Bus and Sink probably), instead of an Effect.
You should be able to achieve what you are looking for while we work on a more elegant solution.
If you have any Questions on this don't hesitate to ask here.
FBumann commentedon Sep 10, 2025
@JonaGL I will try to solve this on Friday. I can't promise that I'll finish it, but ill keep you updated.
JonaGL commentedon Sep 11, 2025
@FBumann Thanks a lot!
FBumann commentedon Sep 18, 2025
@JonaGL i hope you got the news #310 (comment)