Feasibility study of geothermal heat extraction from abandoned oil wells using a U-tube heat exchanger

Energy ◽  
2018 ◽  
Vol 153 ◽  
pp. 554-567 ◽  
Author(s):  
Shabnam Gharibi ◽  
Emad Mortezazadeh ◽  
Seyed Jalaledin Hashemi Aghcheh Bodi ◽  
Ali Vatani
Keyword(s):  
Heat Exchanger ◽  
Feasibility Study ◽  
Oil Wells ◽  
Heat Extraction ◽  
Geothermal Heat ◽  
Tube Heat Exchanger

scholarly journals Effect of pile and heat exchanger properties on total heat extraction of an energy pile - A numerical study

2020 ◽  
Vol 205 ◽  
pp. 05024
Author(s):  
Mithun Mandal ◽  
Ramakrishna Bag
Keyword(s):  
Heat Exchanger ◽  
Geothermal Energy ◽  
3D Model ◽  
Total Heat ◽  
Heat Extraction ◽  
Soil Layers ◽  
Energy Pile ◽  
Tube Heat Exchanger ◽  
Concrete Pile ◽  
Inner Diameter

Geothermal energy is one of the potential energy resources to meet future energy demand keeping environmental pollution under control. This paper presents the use of geothermal energy for space heating from energy pile. An energy pile with a single U tube heat exchanger of polyethylene (PE) pipe was modeled in this study. The effect of pile and heat exchanger properties on the total heat extraction was studied by the finite element analysis using COMSOL Multiphysics. The 3D model was developed and validated based on the literature reported results of an experimental thermal performance of a borehole equipped with a single and double U tube heat exchanger. Tetrahedral elements were considered for simulation of a 3D model. The model of a single energy pile of certain dimensions with different soil layers was considered, each soil layers were associated with different temperature. The effect of various parameters such as the length of concrete pile, the diameter of concrete pile, the thickness of U pipe, the inner diameter of U pipe and velocity of fluid inside the U pipe on amount of heat extraction was studied for an energy pile equipped with a single U tube heat exchanger. It was observed that the most influential parameters in increasing the outlet temperature of the heat exchanger loop are the diameter of the concrete pile, the inner diameter of U pipe and the velocity of fluid inside the U pipe.

scholarly journals Experimental Investigation on Thermal Performance of Double-U-tube Heat Exchanger Using CuO/water Nanofluid as Heat Transfer Fluid

2020 ◽  
Vol 165 ◽  
pp. 01022
Author(s):  
Ruiqing Du ◽  
Dandan Jiang ◽  
Yong Wang
Keyword(s):  
Heat Transfer ◽  
Heat Exchanger ◽  
Thermal Performance ◽  
Transfer Process ◽  
Heat Transfer Process ◽  
Heat Transfer Fluid ◽  
Geothermal Heat ◽  
Tube Heat Exchanger ◽  
Heating And Cooling ◽  
Geothermal Heat Exchanger

By applying the shallow ground energy to supply building heating and cooling, the geothermal heat exchanger systems were considered as an energy-efficient building service system. In this study, the CuO/water nanofluid was employed as circuit fluids of the geothermal heat exchanger system, and the thermal performance of the heat exchanger was investigated. The results showed that the heat transfer process of CuO/water nanofluid became stable earlier than that water. Furthermore, the heat transfer rate of nanofluid was higher than that of water when the heat transfer process plateaued.

scholarly journals Externally heated geothermal bridge deck: Performance analysis of the U-tube ground heat exchanger

2020 ◽  
Vol 205 ◽  
pp. 07006
Author(s):  
Omid Habibzadeh-Bigdarvish ◽  
Xinbao Yu ◽  
Anand J. Puppala
Keyword(s):  
Heat Exchanger ◽  
Soil Temperature ◽  
Bridge Deck ◽  
Heat Extraction ◽  
Bottom Surface ◽  
Ground Heat Exchanger ◽  
Geothermal Heat ◽  
Undisturbed Soil ◽  
Existing Bridges ◽  
Winter Operation

In recent years, the geothermal heat pump de-icing system (GHDS) is introduced as a sustainable solution for bridge deck de-icing, which utilizes renewable geothermal energy. Existing GHDS designs mostly rely upon hydronic loops embedded in concrete decks. To extend the GHDS for existing bridges, a new external hydronic deck has been developed recently, which employs a hydronic pipe being attached to the bottom surface of the bridge deck. In this study, the performance of the externally heated geothermal bridge deck is investigated through winter deicing and summer recharging tests with the focus on the ground loop heat exchanger (GLHE), a key component of the GHDS. The test results show that the de-icing system was successful in maintaining the deck surface temperature above freezing in all winter tests. The soil temperature measurements indicate, the 132.5 m vertical U-tube ground heat exchanger is benefited from the undisturbed soil temperature of around 21 °C. The overall average hourly heat extraction of 0.67 kW during winter operation and average hourly heat injection of 0.69 kW during the summer operation were observed. Also, the ground thermal recharge test showed the increase of undisturbed soil temperature at 1.5 m from the geothermal borehole by 0.36 °C after 50 days of system operation.

Heat Extraction Characteristics of a Single U-Tube Geothermal Heat Exchanger with Earth Retaining Wall

2016 ◽  
Vol 2016.52 (0) ◽  
pp. 202
Author(s):  
Hirotake AKATA ◽  
Makoto TAGO ◽  
Takashi ISHIKAMI ◽  
Mutsuo OTA ◽  
Akinori MIURA
Keyword(s):  
Heat Exchanger ◽  
Retaining Wall ◽  
Heat Extraction ◽  
Geothermal Heat ◽  
Geothermal Heat Exchanger
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