Starting values for referenced temperature values may be improved

[fwitte]

By the way, I just noticed, that with the new version of tespy the code has to be modified very slightly. You have to change this line:

    # old variant: c6.set_attr(fluid={"water": 1}, T=Ref(c7, 1, -10))
    c6.set_attr(fluid={"water": 1}, T=Ref(c7, 1, -10), h0=100)

Originally posted by @fwitte in https://github.com/oemof/tespy/discussions/685#discussioncomment-13598876