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.

Utilization of Geothermal Energy by U-Tube Heat Exchanger

2002 ◽  
Vol 2002 (0) ◽  
pp. 25-26
Author(s):  
Makoto TAGO ◽  
Koji MORITA ◽  
Masahiro SUGAWARA ◽  
Tadashi FUJITA ◽  
Shingo MAWATARI ◽  
...  
Keyword(s):  
Heat Exchanger ◽  
Geothermal Energy ◽  
Tube Heat Exchanger

scholarly journals Optimization of Earth Air Tube Heat Exchanger for Cooling Application Using Taguchi Technique

2020 ◽  
Vol 38 (4) ◽  
pp. 845-862
Author(s):  
Saif Nawaz Ahmad ◽  
Om Prakash
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Coefficient ◽  
Heat Exchanger ◽  
Transfer Coefficient ◽  
Pipe Material ◽  
Ground Heat Exchanger ◽  
Tube Heat Exchanger ◽  
Overall Heat Transfer Coefficient ◽  
The Earth ◽  
Inner Diameter

Earth air tube heat exchanger (EATHE) is one of the passive technologies which utilize the earth stored heat (renewable energy) for heating/cooling the buildings. EATHE releases heat to earth for cooling space in summer, making the earth a heat sink and extracts earth-stored energy for heating space in winter and makes the earth a heat source. This paper optimizes the Length of the ground heat exchanger and overall heat transfer coefficient of earth air heat exchanger using the Taguchi technique for cooling application. For this purpose, we select six factors such as installation depth of Pipe (A), Pipe's inner diameter (B), Thermal conductivity of pipe material (C), Inlet air temperature (D), Outlet air temperature (E), Inlet air velocity (F). All these factors are taken at three levels, and we select an L27 orthogonal array for experimental runs. The ground heat exchanger's Length and the overall heat transfer coefficient were then calculated for each experimental run. In the Taguchi method, we find the signal to noise ratio for an optimal combination of all six factors and ANOVA to find the order of influencing parameters and their percentage contributions for both the objective parameters. According to our results, the best combination for all the six factors for ground heat exchanger length and overall heat transfer coefficient were A1B1C3D1E3F1 and A2B3C2D3E1F3, respectively. The highest and lowest influencing factors for ground heat exchanger length were the pipe's inner diameter and the pipe's installation depth with their contribution factors of 69.12 and 0.32%, respectively. In contrast, the highest and lowest influencing factors for the overall heat transfer coefficient were the pipe's inner diameter and thermal conductivity of pipe material with their contribution factors of 75.97and 0%, respectively. Hence the order of influence of all the six factors for both the objective parameters was BEFDCA.

Geothermal Energy Extraction by Double U-Tube Heat Exchanger

2004 ◽  
Vol 2004.40 (0) ◽  
pp. 171-172
Author(s):  
Makoto TAGO ◽  
Koji MORITA ◽  
Masahiro SUGAWARA ◽  
Tadashi FUJITA ◽  
Manabu FUKUHARA
Keyword(s):  
Heat Exchanger ◽  
Geothermal Energy ◽  
Energy Extraction ◽  
Tube Heat Exchanger

scholarly journals Numerical Study of Heat Transfer and Exergy Analysis of Shell and Double Tube Heat Exchanger

2020 ◽  
Vol 38 (4) ◽  
pp. 925-932
Author(s):  
Ruslan S. Abdulrahman ◽  
Farah A. Ibrahim ◽  
Safaa H. Faisel
Keyword(s):  
Heat Transfer ◽  
Numerical Simulation ◽  
Heat Exchanger ◽  
3D Model ◽  
Exergy Analysis ◽  
Numerical Study ◽  
Ansys Fluent ◽  
Tube Heat Exchanger ◽  
Computational Fluid Dynamics Cfd ◽  
High Reynolds

The heat exchanger (HX) plays a key role for several industries, to reduce the energy consumption by rising heat transfer rate through heat exchanger. In this study, numerical simulation of shell and double tube heat exchanger without and with baffles is analyzed to evaluate the heat transfer and exergy analysis. A numerical simulation of 3D model with turbulent flow at the range (4000-12000) is performed with commercial computational fluid dynamics (CFD) software ANSYS (Fluent). The circular vents baffles model is used at the side of the shell. The simulation results show that the circular vents on the baffles of the heat exchanger have a significant impact on thermal- hydraulic performance and exergy analysis. Also, the results show that the heat exchanger effectiveness with baffles increases by 17% at high Reynolds number comparing with heat exchanger without baffles. Besides, the highest value of exergy loss reached to 42W with baffles presence. Finally, it is concluded that the heat exchanger with baffles gives better hydraulic and thermal performance than that of heat exchanger without baffles.

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

Performance Evaluation and Operation Mechanism of Deep Borehole Heat Exchanger with Different Types of Boundary Conditions

2020 ◽  
Author(s):  
Wanlong Cai ◽  
Chaofan Chen ◽  
Fenghao Wang ◽  
Jun Liu ◽  
Olaf Kolditz ◽  
...  
Keyword(s):  
Heat Exchanger ◽  
Boundary Conditions ◽  
Urban Areas ◽  
Geothermal Energy ◽  
Heat Fluxes ◽  
Heat Extraction ◽  
Neumann Condition ◽  
Deep Borehole ◽  
Borehole Heat Exchanger ◽  
Different Types

<p>Due to its sustainability, continuity and low carbon emissions, the utilization of geothermal energy is gaining more attention all around the world. Shallow geothermal energy is usually extracted through borehole heat exchangers (BHE) with a maximum length up to 150 m. Such systems typically require large space areas, thus limiting its application in built-up urban areas. This study presents a case where deep borehole heat exchanger (DBHE) with a depth down to 2500 m was constructed to extract geothermal energy for building heating purposes. A double-continuum finite element based numerical model was set up to simulate the heat transport process within and around the DBHE. The model has been validated by the experimental data in a demonstration project located in Fengxi, Xi’an China. The heat extracting performance of DBHE under different types of boundary conditions (including the Dirichlet condition and Neumann condition) are evaluated. The amount of thermal recharges from top, sides and bottom of the domain were differentiated and quantified. It is found that different types of boundary conditions will lead to deviations in the simulated heat fluxes and corresponding thermal recharge. The numerical simulations also suggest that the sustainable heat extract capacity of DBHE is mainly determined by the stored heat from the surrounding subsurface, and thermal recharge takes only a limited contribution. According to the calibrated modelling results, the proper heat extraction rate of DBHE in the long-period operation modes is analyzed.</p>

scholarly journals Calculation of a Two-Tube Heat Exchanger with Preliminary Heating of a Binary Mixture in Rectification Processes

2021 ◽  
Vol 136 (5) ◽  
pp. 48-52
Author(s):  
A. B. Golovanchikov ◽  
◽  
N. A. Prokhorenko ◽  
Keyword(s):  
Heat Exchanger ◽  
Working Capital ◽  
Pipe Length ◽  
Preliminary Heating ◽  
Tube Heat Exchanger ◽  
Central Tube ◽  
Economic Parameters ◽  
Calculation Results ◽  
Inner Diameter ◽  
Pipe Heat

A typical algorithm for calculating a two-pipe heat exchanger is supplemented with technical and economic parameters related to annual costs for electricity, depreciation costs for equipment and working capital for repairs and maintenance. An example of the calculation with heating of the oil stream before distillation of the bottom heavy fraction obtained at the outlet of the column is given. The calculation results are presented in the form of dependencies of the main technical and economic parameters: hydraulic resistance, pump power, pipe length on the central tube inner diameter, in which heated crude oil moves counter currently with the bottom of the bottom of the bottom fluid.

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