What version of TRNSYS are you using? I believe there was a bug fix a while back that addressed this issue - but that’s from memory. And what do you mean by the time to heat up the rock bed; the entire average temperature of the rock bed or the temperature near the top of the rock bed? Increasing the number of segments shouldn’t change the average temperature a lot but will change the stratification in the storage. Jeff Sent from my iPhone On Mar 28, 2023, at 2:24 PM, Alex Cheng via TRNSYS-users <trnsys-users@lists.onebuilding.org> wrote:
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