Question-and-Answer Resource for the Building Energy Modeling Community
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I have had similar warnings in loops where low flows are mismatched to equipment capacity - for example, if there is low flow through a chiller, the chiller may cycle on to meet the loop setpoint and over-cool the fluid. When this happens, sometimes the model also runs slowly, as the iteration bounces back and forth between turning the equipment on and off. Check temperatures at a number of nodes on the loop, as well as flow through these loops.
