Numerical investigation of long-term operation of ground-source heat pumps at neighborhood level: Focus on thermal interactions and electricity consumption. (November 2021)

• Record Type: Journal Article
• Authors: Jaafar, Mohamad Ali; Maragna, Charles
• Is Part Of: Geothermics. Volume 96(2021)
• Publication Date: 2021-11
• Subjects: Shallow geothermal energy -- Ground-source heat pumps -- Line source models -- Long-term performance -- Electrical consumption -- Sustainable cities; COP Coefficient of performance -- SGE Shallow geothermal energy -- BHE Borehole heat exchanger -- ILSM, Infinite line source model -- FLSM Finite line source model -- GWF Groundwater flow -- MILSM Moving infinite line source model -- MFLSM Moving finite line source model -- GSHP Ground-source heat pump -- EH Electrical heater -- AHP Air heat pump -- HCF Heat-carrier fluid; Hydrogeology -- Periodicals; Geothermal resources -- Periodicals; Énergie géothermique -- Périodiques; GEOTHERMAL ENGINEERING; GEOTHERMAL ENERGY; GEOTHERMAL EXPLORATION; Geothermal resources; Hydrogeology; Periodicals; Electronic journals; 621.44
• DOI: 10.1016/j.geothermics.2021.102172
• Languages: English
• ISSNs: 0375-6505

Abstract

Highlights: Long-operation of shallow geothermal energy is studied using non-linear programming. Interactions between borehole heat exchangers are studied with line source models. Ground-sourced heat pumps performance is computed dynamically. Fields interactions could be synergies depending upon climate and building use. A simplified and more efficient moving finite line source model is developed. Abstract: A comprehensive numerical investigation of long-term operation of Ground-Sourced Heat Pumps through Borehole Heat Exchangers is presented. Thermal fluxes between systems are analyzed through a semi-analytical method based on line source models. Operation points of geothermal and backup systems are determined by an hourly-based non-linear constrained optimization. Simulations of a 12-buildings neighborhood demonstrated that middle-buildings experience higher electrical consumptions than corner-buildings. Thermal interactions could be interferences or synergies decreasing or increasing GSHP performances, respectively, depending mainly on heating/cooling balance. Parametrical study showed that low Darcy velocities, insulated ground surface, shorter heat-exchangers, and denser and compact neighborhoods enhance thermal interactions impacts.