I need to model a system that uses a neutral temperature thermal storage device for a heat pump loop system. A number of buildings will be connected to a large thermal storage tank which which will be maintained between two setpoints by a geothermal well. The thermal storage tank will allow the buildings to exchange energy with each other as well as provide a buffer for the geothermal pump capacity.
The thermal storage systems in EnergyPlus seem to be dedicated to either heating or cooling. Any ideas on how to model a "neutral" thermal storage?