Journal of Engineering Research and Reports <p style="text-align: justify;"><strong>Journal of Engineering Research and Reports</strong>&nbsp;<strong>(ISSN: 2582-2926)</strong> aims to publish high-quality papers in all areas&nbsp;of engineering.&nbsp;The journal also encourages the submission of useful reports of negative results. This is a quality controlled,&nbsp;OPEN&nbsp;peer-reviewed, open access INTERNATIONAL journal.</p> SCIENCEDOMAIN international en-US Journal of Engineering Research and Reports 2582-2926 Remediation of Crystal Violet Dye Aqueous Solution Using Agro Waste Based Activated Carbon: Equilibrium and Kinetics Studies <p>Remediation of crystal violet (CV) dye aqueous solution was attempted using acid activated <em>raphia hookeri </em>seeds (AARHS) as adsorbent. Adsorption equilibrium and kinetics of CV dye uptake onto AARHS were examined in series of experimental runs, and effects of contact time and initial CV dye concentrations were investigated at different solution temperatures (303 K, 313 K and 323 K). Equilibrium and kinetic data modeling of the adsorption process was performed using selected theoretical methods. Four different forms of Langmuir (type I, II, III and IV) and Freundlich isotherms were considered for fitting the equilibrium data while zero order, first order, pseudo-first order (PFO), second order, types I, II, III and IV pseudo-second order (PSO) and intra-particle diffusion models were selected to describe the kinetics of the adsorption process. Error functions including coefficient of determination (R<sup>2</sup>), root mean square error (RMSE), chi square (χ<sup>2</sup>) and average relative error (ARE) were employed to reveal model of best fit. Results obtained from error value computations show that the equilibrium data best followed Freundlich isotherm, which indicates multilayer adsorption of CV dye onto AARHS. The calculated Freundlich’s adsorption intensity values at different temperatures reveal the favourability of the adsorption process. PSO type I, II and IV best fitted the kinetic data compared to other investigated models. Intra-particle diffusion plots depict that the adsorption process of CV dye onto AARHS is a two-step process and also, intra-particle diffusion is not the only rate-limiting step.</p> Chukwunonso Chukwuzuloke Okoye Okechukwu Dominic Onukwuli Chinenye Faith Okey- Onyesolu Ifeoma Amaoge Obiora- Okafo ##submission.copyrightStatement## 2020-08-13 2020-08-13 1 11 10.9734/jerr/2020/v15i417149 Leadframe Design Enhancement for Elimination of Burrs at Singulation Process <p>The paper focused on the improvement done in leadframe design to address the copper (Cu) burrs defect in assembly manufacturing.&nbsp; Newly qualified device struggled to hit the target yield due to the said Cu burrs defect. A holistic approach through why-why analysis was performed by the technical cross-functional team to identify the root-cause and come-up with the robust solution to the issue. The paper discussed how the device in focus was made as point of reference in designing a leadframe carrier. Ultimately, the new and enhanced leadframe design successfully eliminated the occurrence of Cu burrs with 100% improvement in the scrappage rate.</p> Antonio Sumagpang Jr. Frederick Ray Gomez Edwin Graycochea Jr. ##submission.copyrightStatement## 2020-08-13 2020-08-13 12 16 10.9734/jerr/2020/v15i417150 Pressure Transient Analysis for Sandstone Reservoir by Using Saphir <p>This work is discussed how to differentiate between two tricky models for sand stone formation by using the pressure transient analysis PTA for three Wells which are distributed in south, middle and north of X field. In the derivative curve these two models have the same sequence of flow regime which are by hump, first radial flow regime, transition hump and then late radial flow regime. The parameter Kappa (K) played the most important key to select the type of reservoir model and differentiate between the two models in PTA. In the middle and south of the field, this parameter has a value close to one at well no. Rt-16 &amp; Rt-18, which means that the system behaves as dual porosity. On the other hand, Kappa has a value of around (0.74) in Rt-17 to represent a double permeability system but without cross flow between two layers due to the small value of Lamda.</p> Hussein Al- Ali ##submission.copyrightStatement## 2020-08-14 2020-08-14 17 24 10.9734/jerr/2020/v15i417151 Economic Analysis of Compressor Inlet Air Precooling Techniques of a Gas Turbine Operational in Nigerian Energy Utility Sector <p>Economic analysis of gas turbine compressor inlet air precooling is based on the economical evaluation (maintenance, operations and personnel costs) of the various precooling systems used to improve the performance of gas turbine operational in Nigeria energy utility sector. The precooling techniques studied are evaporative, vapour compression and vapour absorption precooling techniques. This study objectively compared the three precooling techniques taking into consideration the prevailing climatic conditions of Nigeria. The overall yearly cost for evaporative, vapour compression and vapour absorption precooling techniques are evaluated to be USD25501.31/KWh, USD69867.19/KWh and USD1184548.01/KWh respectively and the payback time is three years. The system profitability for evaporative, vapour compression and vapour absorption precooling systems are USD1785376.83/KWh, USD7198182.79/KWh and USD11103747.4/KWh respectively and the payback time is three and a half year. The Net Revenue of the systems is USD8782909.21/KWh, USD15888192.52/KWh and USD84947043.84/KWh respectively. In conclusion, it is recommended that evaporative precooling system should be used in dry and humid weather conditions (Northern region of Nigeria) but it must be ensured that water is in abundance and refrigeration precooling should be employed in the moderate climatic conditions (Southern Region of Nigeria).</p> Victor C. Okafor ##submission.copyrightStatement## 2020-08-14 2020-08-14 25 34 10.9734/jerr/2020/v15i417152