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A Review of Performance Appraisals of Nigerian Federal Government-Owned Refineries

Energy and Power Engineering 2012年第1期4卷 47-52页

作者： Ismaila Badmus miracle olanrewaju oyewola Richard Olayiwola Fagbenle 不详

The aim of this paper is to review previous works on the performance appraisal of Nigerian government-owned refineries. The review has been done in a general sense, covering appraisal works by engineers, scientists, management experts, economists, sociologists and even historians. The outcome indicates that while there seems to be several works directly and/or indirectly assessing the performance of the refineries in a general sense, there is a dearth of such in the specific area of energy consumption. There also appears to be no single one appraising energy utilisation of all the refineries at the same time in the open literature. This is in spite of the fact that refining processes are energy intensive. Despite popularisation of exergy analysis as a veritable tool, the only energy utilisation appraisal within our reach which was carried out on just one of the refineries has not been done exergetically. However, the work still reveals, within the limitations of 1st Law energy analysis that the energy consumption patterns are below international benchmarks in the oil and gas industry. Some suggestions have also been offered to take care of the energy efficiency challenges in these refineries. These include plant to plant analyses of energy utilisation patterns in the four refineries, periodical determination of GHG emission levels in the refineries using current international best practices as benchmarks, use of exergy analysis to check avoidable energy wastage in the refining processes, shifting refinery fuelling pattern in favour of low carbon content fuels like natural gas and ensuring regular turnaround maintenance of the system.

关键词： Nigerian Refineries Energy Efficiency Exergy Analysis Review Performance Appraisal

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Effect of Heatpipe Array Condenser Section Length on Thermal Cooling of Li-Ion Batteries

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Frontiers in Heat and Mass Transfer 2024年第2期22卷 475-490页

作者： olanrewaju M.oyewola Olawale S.Ismail Adetokunbo A.Awonusi Department of Mechanical Engineering University of Alaska FairbanksFairbanks99775USA Department of Mechanical Engineering University of IbadanIbadan200005Nigeria

One of the new methods for ensuring that the battery in a thermal energy storage system is kept at the proper temperature is the heat pipe-based ThermalManagement System(TMS).In this study,the improvement of cooling performance of a heat pipe based TMS is examined through the variation of condenser section length of heat pipes in an *** TMSs with an array of heat pipes with different condenser section lengths are *** system performances are evaluated using a validated numerical *** results show that a heat pipebased TMS provides the best cooling performance when a wavy-like variation is employed and when the condenser section length of the last set of the heat pipe in the array is greater than that of the penultimate *** maximum cell temperature and the maximum temperature difference within the cell of this TMS are decreased by 4.2 K and 1.1 K,respectively,when compared to the typical heat pipe based TMS with zero variation in its condenser section ***,the strategy offers an improvement in the thermal uniformity for all the TMS cases.

关键词： Thermal cooling condenser section length Li-ion battery heatpipe

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Magnetic Field Enhancement in Ammonia-Water Absorption Refrigeration Systems

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Energy and Power Engineering 2014年第4期6卷 54-68页

作者： Moradeyo K. Odunfa Richard O. Fagbenle olanrewaju M. oyewola Olayinka S. Ohunakin Mechanical Engineering Department Covenant University Ota Nigeria Mechanical Engineering Department Obafemi Awolowo University Ile-Ife Nigeria Mechanical Engineering Department University of Ibadan Ibadan Nigeria

Absorption enhancement has been considered as an effective way of improving coefficient of performance (COP) of refrigeration systems and magnetic enhancement is one of these methods. A model of magnetic field enhancement in ammonia-water absorption systems is presented in this paper. A numerical model using finite difference scheme was developed based on the conservation equations and mass transport relationship. Macroscopic magnetic field force was introduced in the momentum equation. The model was validated using data obtained from the literature. Changes in the physical properties of ammonia solution while absorbing both in the direction of falling film and across its thickness were investigated. The magnetic field was found to have some positive effect on the ammonia-water falling film absorption. The results indicate that absorption performance enhancement increased with magnetic intensity. The COP of simple ammonia solution absorption refrigeration system increased by 1.9% and 3.6% for magnetic induction of 1.4 and 3.0 Tesla respectively.

关键词： Ammonia-Water Absorption Refrigeration Magnetic Field Force Ammonia Solution Concentration Coefficient of Performance Finite Difference Scheme Numerical Solution

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