Question-and-Answer Resource for the Building Energy Modeling Community
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Here are some things I would check.
You are autosizing the tank's source side and plant loop design flow rate, but hard sizing the boiler flow rates -- make sure these are coming out to be consistent.
At first glance it seemed like maybe the tank's source side flow rate is too low, you could try a shorter indirect heat recovery time.
The design water outlet temperature in the boilers is set at 48.9C, I think you want this match the 82.22 setpoint for the boiler loop.
I am not sure you really need DualSetpointDeadband in the boiler plant loop, you might try using single setpoint there.
