scholarly journals Hydrochemical and biotic control on iron incrustations in groundwater heat pump systems: Case study from a saline, anoxic aquifer in Melhus, Norway

Geothermics ◽  
2022 ◽  
Vol 100 ◽  
pp. 102349
Author(s):  
Lars A. Stenvik ◽  
Sondre Gjengedal ◽  
Randi K. Ramstad ◽  
Bjørn S. Frengstad
Keyword(s):  
Heat Pump ◽  
Groundwater Heat Pump ◽  
Biotic Control

Evaluation of measures to improve the performance of an open loop ground source heat pump system in the chalk aquifer: a case study

2021 ◽  
pp. qjegh2021-074
Author(s):  
D. Birks ◽  
C. Adamson ◽  
M. G. Woods ◽  
G. Holmes
Keyword(s):  
Heat Pump ◽  
Cooling System ◽  
Specific Capacity ◽  
Open Loop ◽  
Ground Source Heat Pump ◽  
Pump System ◽  
Heat Pump System ◽  
Ground Source ◽  
Groundwater Heat Pump

A case study documenting the development of a groundwater-fed district heat network in Colchester, UK, is presented. The performance of an open loop groundwater heating and cooling system (also known as a ground source heat pump (GSHP)) is a function of the performance of individual boreholes and interactions between the boreholes. When performance does not meet its design capacity or decreases with time, various measures can be undertaken to improve either the performance of individual wells or the performance of the system as a whole.Output from the first exploration borehole was less than expected, placing the business case for the development in jeopardy. Consequently, refinements to the remainder of the drilling programme were implemented including three to improve the performance of individual wells and two to improve performance of the system in its entirety. Results of these refinements are presented and may be used to inform the design of new open loop groundwater heat pump systems (GSHPs) and/or the rehabilitation of existing systems that have experienced diminished performance.Yields from three wells drilled using the reverse circulation method were more than double those drilled with the direct water flush method. A significant improvement in the performance of abstraction wells due to reinjection was observed. Specific capacity in abstraction wells increased by c. 40% due to reinjection, where the distance between abstraction and reinjection locations was 535–717 m. Allowing an excess pressure of up to 0.2 MPa in the reinjection boreholes meant that reinjection could be achieved with fewer wells.Outputs from abstraction wells were not increased by extending the depth of boreholes from 135 to 200 m or implementing additional acid treatments.

Clogging Problems in Groundwater Heat Pump Systems in Sweden

1988 ◽  
Vol 20 (3) ◽  
pp. 133-140 ◽  
Author(s):  
Annika Lindblad-Påsse
Keyword(s):  
Redox Potential ◽  
Heat Pump ◽  
Hydrogen Sulphide ◽  
Sludge Formation ◽  
Iron Bacteria ◽  
Iron Precipitation ◽  
Water Composition ◽  
Groundwater Heat Pump ◽  
And Control ◽  
System Knowledge

A number of groundwater heat pump systems have been investigated to determine the extent of problems caused by the chemistry of the groundwater used. The main purpose was to investigate sites using iron rich groundwater. Fifteen facilities were studied regularly for three years. Ten of these facilities had some kind of problem caused by iron precipitation. Four of the sites were rebuilt because of severe plugging due to iron sludge in wells, pumps and pipes. In all facilities with severe problems, iron bacteria were found. Low redox potential, indicated by hydrogen sulphide in the groundwater, seems to protect from iron bacteria. In some of the systems using groundwater with H2S the problems were corrosion and sludge formation caused by sulphur oxidizing bacteria. Rapid clogging was caused by aeration of the groundwater due to improper design of the system. Knowledge of the water composition, design of the systems to minimize aeration, and control of clogging turned out to be important factors to maintain operation safety.

Case study of underground pipe ground coupled heat pump system

2012 ◽  
Vol 19 (3) ◽  
pp. 664-668
Author(s):  
Min Zheng ◽  
Bai-yi Li ◽  
Zheng-yong Qiao
Keyword(s):  
Heat Pump ◽  
Pump System ◽  
Heat Pump System ◽  
Underground Pipe ◽  
Ground Coupled Heat Pump

Determination of optimal well locations and pumping/injection rates for groundwater heat pump system

Geothermics ◽  
2021 ◽  
Vol 92 ◽  
pp. 102050
Author(s):  
Dongkyu Park ◽  
Eunhee Lee ◽  
Dugin Kaown ◽  
Seong-Sun Lee ◽  
Kang-Kun Lee
Keyword(s):  
Heat Pump ◽  
Pump System ◽  
Heat Pump System ◽  
Groundwater Heat Pump ◽  
Injection Rates

Research on Influence of Water Source Heat Pump System to Groundwater - A Case Study of New Campus of Taiyuan University

2011 ◽  
Vol 356-360 ◽  
pp. 2329-2332
Author(s):  
Shu Qin Gao ◽  
Yu Ming Feng
Keyword(s):  
Heat Pump ◽  
Water Source ◽  
Pump System ◽  
Air Conditioning System ◽  
Heat Pump System ◽  
Protection Method ◽  
Groundwater Environment ◽  
New Energy ◽  
Influence Of Water

Water source heat pump system(WSHPS) is a new energy saving and environmentally air conditioning system, its degree of influence to groundwater related to the feasibility of construction of WSHPS and development & protection of regional groundwater. After introducing WSHPS, this paper analyzed the influence of WSHPS to groundwater, brought up the protection method to reduce influence. At last, a case study of new campus of Taiyuan university was carried out. The results showed that running of WSHPS won’t bring up disadvantage to groundwater environment.

An energetic, economic and environmental evaluation of a dual-source heat pump water heater – A case study in Beijing

2022 ◽  
Vol 253 ◽  
pp. 115190
Author(s):  
Rong Zhao ◽  
Yuming Liu ◽  
Chongxing Li ◽  
Boya Ji ◽  
Binyu Wang
Keyword(s):  
Heat Pump ◽  
Water Heater ◽  
Environmental Evaluation ◽  
Heat Pump Water Heater ◽  
Dual Source

scholarly journals Improved method and case study of ground-coupled heat pump system design

2012 ◽  
Vol 14 ◽  
pp. 849-854 ◽  
Author(s):  
Zhang Xuedan ◽  
Jiang Yiqiang ◽  
Yao Yang
Keyword(s):  
System Design ◽  
Heat Pump ◽  
Improved Method ◽  
Pump System ◽  
Heat Pump System ◽  
Ground Coupled Heat Pump

scholarly journals Sustainability indicator for the prevention of potential thermal interferences between groundwater heat pump systems in urban aquifers

2019 ◽  
Vol 134 ◽  
pp. 14-24 ◽  
Author(s):  
Alejandro García-Gil ◽  
Sylvia Muela Maya ◽  
Eduardo Garrido Schneider ◽  
Miguel Mejías Moreno ◽  
Enric Vázquez-Suñé ◽  
...  
Keyword(s):  
Heat Pump ◽  
Sustainability Indicator ◽  
Groundwater Heat Pump

scholarly journals Case study on optimal design and operation of detached house energy system: Solar, battery, and ground source heat pump

2022 ◽  
Vol 308 ◽  
pp. 118370
Author(s):  
Ellen Nordgård-Hansen ◽  
Nand Kishor ◽  
Kirsti Midttømme ◽  
Vetle Kjær Risinggård ◽  
Jan Kocbach
Keyword(s):  
Optimal Design ◽  
Heat Pump ◽  
Energy System ◽  
Ground Source Heat Pump ◽  
Ground Source ◽  
Solar Battery ◽  
Detached House
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