Question-and-Answer Resource for the Building Energy Modeling Community
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I found a potential fix, although it may not be the best answer. I was able to start the tank cold and keep it cold by setting up a schedule in OpenStudio that, for the first full week of the year, had a setpoint of 23.3 degC, instead of the standard 67 degC setpoint for the tank.
When I tried having the cold setpoint for a shorter timeframe than a week, the tank would warm up without me understanding where the heat came from.
