Their is no example on OffsetTransformer (with two outputs)

[jakob-wo]

Hi everyone!

We are about to model a local (district) heating network with a CHP that can/should either run (~100%) or be switched off.
Therefore I was looking into the OffsetTransformer and it seems we don't have an exampe on that.
Our application needs a CHP with two outputs, something the Transformer does but the OffsetTransformer does not provide. We came up with the following simple work-around:

gas_bus --> OffsetTransformer --> auxillary_gas_bus --> Transformer (CHP) --> electricity & heat busses

Here, the OffsetTransformer accts more or less as a valve that can just be opend (~100%) or closed (0%). The Transformer then has two outputs and holds the actual technical specifications of the CHP.
The same setup can be used for part-load behavior, etc.

What do you think about that work-around?

1. Is there another (smoother) way to model such a CHP?
2. Is this setup worth to get its own example?

[jnnr]

Couldn't you do the same thing by making the gas input flow nonconvex and set min=1?