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Using a (thick) surface as thermal storage in E+

I have a building with a very thick concrete slab (more than a meter thick, over several thousands square meters of area) and would like to evaluate the potential savings of embedding pipes in the slab and thermally charge it at night to reduce my daytime peak electricity usage.

For example in the summer, a heat pump is providing chilled water to terminal units. I'd like to use the heat pump at night to cool the slab down, then during the day I'd discharge the slab first to limit the electricity used by the heat pump for cooling.

In the winter, the same heat pump (in the heating mode) is provided hot water to terminal units. I'd like to use the heat pump at night to heat the slab, then during the day I'd discharge the slab first to limit the electricity used by the heat pump for heating.

Is there any good way to do this in E+?