Thermal resistance and capacity model for standing column wells operating under a bleed control. (April 2015)

• Record Type: Journal Article
• Authors: Nguyen, A.; Pasquier, P.; Marcotte, D.
• Is Part Of: Renewable energy. Volume 76(2015)
• Page Start: 743
• Page End: 756
• Publication Date: 2015-04
• Subjects: Standing column well -- Ground heat exchanger -- Thermal resistance -- Geoexchange -- Groundwater flow; Renewable energy sources -- Periodicals; Power resources -- Periodicals; Énergies renouvelables -- Périodiques; Ressources énergétiques -- Périodiques; 333.794
• DOI: 10.1016/j.renene.2014.11.080
• Languages: English
• ISSNs: 0960-1481

Abstract

Abstract: A fully coupled multiphysics model involving heat transfer and groundwater flow within a standing column well and its surrounding ground was modeled by means of a thermal resistance and capacity network coupled to an analytical solution. The transient groundwater velocity field and aquifer drawdown are addressed by applying a temporal superposition technique to the so-called Theis analytical equation. The heat pumps are integrated into the model, thereby allowing the effect of its entering water temperature on its capacity and coefficient of performance to be accounted for. To increase the flexibility of the approach, a three-level bleed control and an on-off sequence is included in the model, in order to allow the simulation of the dynamics of a system operation. The results show that the model developed in this paper is consistent with numerical reference solutions. Highlights: A new numerical model to calculate the thermal and hydraulic response for standing column wells. The model couples heat transfer and groundwater flow. The model features a three-level bleed control and an on-off sequence to simulate the dynamic operation of a SCW. The iterative algorithm is convergent and efficient.