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.

Change of the redox potential in the profile of light grey forest surface-gleyed soil under different anthropogenic

2018 ◽  
Vol 2 (95) ◽  
pp. 26-29
Author(s):  
O.S. Gavrishko ◽  
Yu.M. Olifir ◽  
T.V. Partyka
Keyword(s):  
Redox Potential ◽  
Mineral Fertilizer ◽  
Fertilizer Application ◽  
Soil Tillage ◽  
Mineral Fertilizers ◽  
Gleyed Soil ◽  
Agricultural Use ◽  
Fertilizer System ◽  
And Control ◽  
The Given

The results of studies of the change in redox potential in the profile of light gray forest surface-gleyed soil on variants with long-term agricultural use without applying fertilizers and mineral fertilizer system solely compared with the soil under the forest are presented. On the basis of the conducted analyzes it was established, that soil tillage without fertilizer application and with mineral fertilizer solely has a different effect on ROP in the profile. In the soil without fertilization (control) as compared to the forest a moderate oxidizing (514 mV) and slightly oxidizing (437 mV) processes are happening. Prolonged application of mineral fertilizers to the soil (N65R68K68) significantly reduced the redox potential of all genetic horizons compared with forest and control without fertilizers. For the given fertilizer system the highest values of ROP were obtained in arable HEgl and underarable HEgl layers: 426 mV and 416 mV respectively. Redox potential sharply decreases with the depth to 398-311 mV, which characterizes processes occurring in the soil profile, as weakly reducing and close to moderately reducing.

Structure and control co-optimization for an ejector expansion heat pump coupled with thermal storages

2021 ◽  
Vol 235 ◽  
pp. 110755
Author(s):  
Fang Liu ◽  
Jiaxin Deng ◽  
Qiu Mo ◽  
Yanping Xu ◽  
Dan Liu ◽  
...  
Keyword(s):  
Heat Pump ◽  
And Control

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

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

Development and Challenges of Groundwater Heat Pump in China

2012 ◽  
Vol 193-194 ◽  
pp. 115-120
Author(s):  
Qing Gao ◽  
Xue Zhi Zhou ◽  
Xiao Wen Zhao ◽  
Chun Qiang Ma ◽  
Yu Ying Yan
Keyword(s):  
Heat Pump ◽  
Energy Transport ◽  
Control Strategies ◽  
Energy Utilization ◽  
Ground Source Heat Pump ◽  
Ground Source ◽  
Groundwater Environment ◽  
Groundwater Heat Pump ◽  
Over Exploitation ◽  
Direct Use

A groundwater heat pump (GWHP) is one type of ground source heat pump (GSHP) and is a major form of earth energy utilization, which can realize the direct use of groundwater energy or the reuse of stored underground energy. The energy conservation effect of GWHP plays an important role in the national energy strategy, but the groundwater environment has been affected and even damaged to some extent because of over-exploitation and unreasonable utilization. This paper reviews the development and challenges of GWHP in China and surveys the situation of groundwater utilization, which shows that lack of cognitive ability, scientific constraints and reasonable utilization may bring catastrophic damage to the groundwater. A coming work should aim to more researching basic problems, such as thermal interaction, energy transport in the well field, groundwater contamination, etc. In fact, the characteristics of unsteady and transient heat transfer in the complex underground environment, and their control strategies have been being also the most pressing problem. Their explorations and studies will strengthen the theoretical and practical understanding, and guide an orderly, healthy and sustainable development of GWHP.

Sign in / Sign up

Export Citation Format

Share Document