CFD Simulation Studies for Vertical Temperature Profile, Pitch Optimisation and Parametric Study of Borehole Heat Exchanger
Shiv Lal,
Subhash Chand Kaushik,
Pradeep Kumar Bhargava
Issue:
Volume 1, Issue 2, October 2016
Pages:
16-23
Received:
23 July 2016
Accepted:
10 August 2016
Published:
6 September 2016
DOI:
10.11648/j.ijeee.20160102.11
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Abstract: In this communication, simulation studies of a borehole heat exchanger are worked out through computational fluid dynamics (CFD) software. A two dimensional (k-ε) realizable turbulent model with standard wall function is used to evaluate the temperature variation along with depth of BHE, pitch optimization and to determine the effect of two dimensionless parameters as ratio of pitch to borehole diameter and ratio of borehole to pipe diameter. The predicted results are validated through experimental data; and statistical assessment shows a good agreement between simulated and experimental results. The tube air temperature is proportional to depth in cooling mode and BHE can decrease the temperature of air by 13-14°C when ambient temperature observed by 41°C. The optimised pitch for 8 inch borehole and 2 inch diameter U-tube is found to be 4 inch, however two U-tubes are recommended for enhanced performance. The effective borehole to tube diameter ratio is estimated by 4. The BHE system can be used for heating and cooling of buildings it is a feasible solution for sustainable development.
Abstract: In this communication, simulation studies of a borehole heat exchanger are worked out through computational fluid dynamics (CFD) software. A two dimensional (k-ε) realizable turbulent model with standard wall function is used to evaluate the temperature variation along with depth of BHE, pitch optimization and to determine the effect of two dimensi...
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Carbon Dioxide Emissions (CO2), Energy Consumption and Economic Development of New Industrialized Countries Using Panel Econometric Analysis
Rajasekar Thangasamy,
Malabika Deo,
Kalaimohan Sankaran
Issue:
Volume 1, Issue 2, October 2016
Pages:
24-33
Received:
31 August 2016
Accepted:
5 October 2016
Published:
17 October 2016
DOI:
10.11648/j.ijeee.20160102.12
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Abstract: The present research work started with a simple question: Is there any relationship between carbon dioxide emissions, energy consumption and economic growth of new industrialized countries. The study tries to evaluate the relationship, cause and effect between CO2 emissions, energy consumption and economic growth. Since the research used panel data, the sophisticated panel data models such as unit root, cointegration, error correction model, granger causality, impulse response function and variance decomposition tests were used over the period of 1960 to 2014. From the result, it is found that there exists long run relationship and causality between energy consumption and economic growth and also found the relationship between carbon dioxide emissions. Hence the study has concluded that, if the country needs to increase their economic growth they are bound to use energy, but at the cost of CO2. emission. The study also suggested that as per the Kyoto protocol, new industrialized countries need to take necessary steps to reduce CO2 emissions with an immediate effort.
Abstract: The present research work started with a simple question: Is there any relationship between carbon dioxide emissions, energy consumption and economic growth of new industrialized countries. The study tries to evaluate the relationship, cause and effect between CO2 emissions, energy consumption and economic growth. Since the research used panel data...
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Limestone Deposits and Its Economic Importance at Panchbibi Area of Joypurhat District, Bangladesh
Mohammed Masum,
Nehal Uddin,
Nazwanul Haque,
Nuruzzaman Sabuj,
Mohammad Shahariar Hasan,
Rubel Sheik
Issue:
Volume 1, Issue 2, October 2016
Pages:
34-39
Received:
9 July 2016
Accepted:
22 July 2016
Published:
28 October 2016
DOI:
10.11648/j.ijeee.20160102.13
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Abstract: The study area is located at Panchbibi upazila of Joypurhat District which is in the south-western part of Bangladesh. Tectonically the area lies in the southern slope of Rangpur saddle within the stable Precambrian platform. The investigation work carried out by an exploratory drilling operation with the help of wire line drilling rig. Core samples were collected and subsequently analyzed during the drilling activity. Three limestone layers have been encountered at different depth of this drilling hole which is in between 450 meter to 530 meter below the surface. This limestone is light grey in colour, fossiliferous, sandy in nature, moderately hard and compacted. The outer surfaces of core samples are not smooth. It Composed of mainly (>40%) calcium carbonate (CaCO3). The average chemical property of limestone is 44% CaO, 10% SiO2, 1% Fe2O3 and 2% Al2O3. The thickness of limestone is varies from layer to layer where first layer is about 8 m thick and the total thickness of the limestone is about 13 m. The physical and chemical properties of limestone indicated that the quality of limestone is medium to good. Composed of calcareous sands, both skeletal and oolitic, with lesser volume of fine carbonate mud and reef rocks which indicated that the condition of deposition of this limestone is shallow water deposits. It is the most important and widely distributed carbonate rocks which used in many industrial purposes. The limestone deposit of the studied area may utilize at different purposes after extraction like as mainly in manufactures of cement clinkers in the cement factory. Besides it is also used as different construction materials. It should be suggested that more exploratory drilling hole detail geophysical investigation might be done to evaluate the real picture of this deposits.
Abstract: The study area is located at Panchbibi upazila of Joypurhat District which is in the south-western part of Bangladesh. Tectonically the area lies in the southern slope of Rangpur saddle within the stable Precambrian platform. The investigation work carried out by an exploratory drilling operation with the help of wire line drilling rig. Core sample...
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