In the present paper the analysis of the performance of an underground thermal energy storage (UTES) system is compared to a traditional HVAC plant. In particular the study is aimed at evaluating the opportunities offered by the combination of the UTES with a desiccant based air handling unit (AHU). Differently from the conventional solutions, the humidity control is here separately obtained by chemical dehumidification of the ventilation airstream performed by liquid desiccants in a packed column. In winter the AHU configuration allows sensible and latent heat recovery while in summer the borehole heat exchangers water temperature is generally suitable to meet the sensible load without any integration by the chillers. In this way not only operation but above all the investment costs are reduced and the UTES system competitiveness is increased. The described solutions are investigated by a computer simulation referring to a modern office building in a climate of the northern Italy
Analysis of an air conditioning system using underground thermal energy storage combined with chemical dehumification
LONGO, GIOVANNI ANTONIO;
2003
Abstract
In the present paper the analysis of the performance of an underground thermal energy storage (UTES) system is compared to a traditional HVAC plant. In particular the study is aimed at evaluating the opportunities offered by the combination of the UTES with a desiccant based air handling unit (AHU). Differently from the conventional solutions, the humidity control is here separately obtained by chemical dehumidification of the ventilation airstream performed by liquid desiccants in a packed column. In winter the AHU configuration allows sensible and latent heat recovery while in summer the borehole heat exchangers water temperature is generally suitable to meet the sensible load without any integration by the chillers. In this way not only operation but above all the investment costs are reduced and the UTES system competitiveness is increased. The described solutions are investigated by a computer simulation referring to a modern office building in a climate of the northern ItalyPubblicazioni consigliate
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