A comparative study on borehole heat exchanger size for direct ground coupled cooling systems using active chilled beams and TABS

Direct ground cooling is a method for buildings whereby free provided by circulating water through borehole heat exchangers (BHEs). Since no refrigeration involved, supply temperature to the building’s system dependent mainly on BHE sizing. This study investigates sizing of BHEs direct systems, with particular focus influence terminal unit types and their operating strategies. Experimental results using ground-coupled active chilled beam (ACB) are used develop simulation model an office building. The also modified thermally activated building systems (TABS). show that TABS instead ACBs similar reduced peak hourly loads, resulting in lower outlet temperature. Resizing depth reach maximum temperatures according actual extraction rate from resulted significantly shorter compared ACBs. However, indoor was generally warmer TABS, due slower room. findings practical analysing design operation different units.