The effects of antifreeze in the circulating water on the operation performance of ground heat exchangers

摘要

Ground-coupled heat pump (GCHP) systems often require antifreeze in the circulating water inlocations with significant heating seasons, such as Northern China. In this study, the effects ofantifreeze in the circulating water on operation performance of ground heat exchangers (GHEs) wasinvestigated. A theoretical model was derived to analyze the antifreeze effect. Then the model wasvalidated by an experimental system. Based on the effects of antifreeze solution on heat transferperformance and friction loss, the correction factor of flowrate and friction loss are given. In addition,the design method for GHEs in cold regions are also discussed.