Mix of coursework and my internship, so I’d like the why as well as the what.
A district heating substation: a PI loop drives a 3-way valve to hold the secondary supply temperature. Outdoor temperature is the main disturbance and we measure it, so I want to add feed-forward. Two questions:
1. How do I pick the loop’s execution interval (Δt) when I know the disturbance? My notes say «fast enough compared with the disturbance» which isn’t a number.
2. My mentor half-jokingly suggested doing the control in Hermetry with a Rules card, since the readings are there anyway. Is that a terrible idea or just a bad one?
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