The observed effects of changes in groundwater flow on a borehole heat exchanger of a large scale ground coupled heat pump system

Geothermics ◽  
2018 ◽  
Vol 74 ◽  
pp. 240-246 ◽  
Author(s):  
David C. Smith ◽  
A.C. Elmore
Keyword(s):  
Heat Exchanger ◽  
Groundwater Flow ◽  
Heat Pump ◽  
Large Scale ◽  
Borehole Heat Exchanger ◽  
Pump System ◽  
Heat Pump System ◽  
Ground Coupled Heat Pump

scholarly journals Long-Term Temperature Evaluation of a Ground-Coupled Heat Pump System Subject to Groundwater Flow

Energies ◽  
2019 ◽  
Vol 13 (1) ◽  
pp. 96
Author(s):  
Nehed Jaziri ◽  
Jasmin Raymond ◽  
Nicoló Giordano ◽  
John Molson
Keyword(s):  
Groundwater Flow ◽  
Heat Pump ◽  
Exchange Capacity ◽  
Pump System ◽  
Heat Pump System ◽  
Ground Coupled Heat Pump ◽  
Darcy Flux ◽  
Advective Heat Transfer ◽  
Heat Injection ◽  
The Impact

The performance of ground-coupled heat pump systems (GCHPs) operating under significant groundwater flow can be difficult to predict due to advective heat transfer in the subsurface. This is the case of the Carignan-Salières elementary school located on the south shore of the St. Lawrence River near Montréal, Canada. The building is heated and cooled with a GCHP system including 31 boreholes subject to varying groundwater flow conditions due to the proximity of an active quarry being irregularly dewatered. A study with the objective of predicting the borehole temperatures in order to anticipate potential operational problems was conducted, which provided an opportunity to evaluate the impact of groundwater flow. For this purpose, a numerical model was calibrated using a full-scale heat injection test and then run under different scenarios for a period of twenty years. The heat exchange capacity of the GCHP system is clearly enhanced by advection when the Darcy flux changes from 6 × 10−8 m s−1 (no dewatering) to 8 × 10−7 m s−1 (high dewatering). This study further suggests that even the lowest groundwater flow condition can be beneficial to avoid a progressive cooling of the subsurface due to the unbalanced building loads, which can have important impacts for design of new systems.

Recent Status and Development in Researches on Ground-Coupled Heat Pump System

2011 ◽  
Vol 354-355 ◽  
pp. 759-765
Author(s):  
Jin Hua Chen ◽  
Xiu Bi Bao
Keyword(s):  
Heat Pump ◽  
Large Scale ◽  
Development Trend ◽  
Pump System ◽  
Heat Pump System ◽  
Tube Heat Exchanger ◽  
The Status ◽  
Ground Coupled Heat Pump ◽  
Theoretical Stage ◽  
The Development Trend

At present, development of ground-coupled heat pump technology in China has entered the stage of large-scale project application from purely theoretical stage. The key question is how to apply theory to practice efficiently. However, there are still a large number of scholars who remain in the Researches on theoretical heat transfer of buried tube heat exchanger and theoretical soil thermal equilibrium. So it is essential to know the status of ground-coupled heat pump, the pressing issues and trends in the development process. This paper revealed the development status of ground-coupled heat pump, analyzed problems combining with engineering examples and predicted the development trend reasonably. The important issues are mass demonstration and promotion, which need reasonable solutions and proven technology.

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