# Big imbalance

**URL:** <https://www.simscale.com/forum/t/big-imbalance/101447>\
**Category:** Post-processing\
**Created:** [November 12, 2026, 9:41am UTC](https://www.simscale.com/forum/t/big-imbalance/101447 "2026-11-12T09:41:38Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![typolderman](https://www.simscale.com/forum/letter_avatar/typolderman/32/6_22734026db12803ebb3e059622ac3534.png) [@typolderman](https://www.simscale.com/forum/u/typolderman)\
**Post date:** [November 12, 2026, 9:41am UTC](https://www.simscale.com/forum/t/big-imbalance/101447/1 "2026-11-12T09:41:38Z")

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Hi,

I’m simulating a subsurface solar collector. I swapped out the fluids for a heat transfer coefficient to minimize the computational requirements. All of my graphs look very converged, yet when I calculate the imbalance, it’s pretty high at a 1.6% imbalance. Here’s a screenshot of the selected surfaces. Maybe I’m doing the calculations wrong, is something wrong with my setup?

 ![image](https://www.simscale.com/forum/uploads/default/original/3X/1/6/164b1225a7344f96e40750fc6c4ca11a66aa5450.png)