Multiple source ground heat storage

[摘要] Sharing geothermal borefields is usually done with each borehole having the same inlet conditions (flow rate, temperature and fluid). The objective of this research is to improve the energy efficiency of shared and hybrid geothermal borefields by segregating heat transfer sources. Two models are briefly presented: The first model allows the segregation of the inlet conditions for each borefields; the second model allows circuits to be defined independently for each leg of double U-tubes in a borehole. An application couples residential heat pumps and arrays of solar collectors. Independent circuits configuration gave the best energy savings in a symmetric configuration, the largest shank spacing and with solar collectors functioning all year long. The boreholes have been shortened from 300 m to 150 m in this configuration.

[发布机构] Ecole de Technologie Supérieure, 1100 Rue Notre-Dame O, Montréal; QC; H3C 1K3, Canada^1

[关键词] Geothermal modeling;Ground heat storage;hybrid geothermal;Inlet conditions;Multiple source;Residential heat pumps