Alhassan Salami Tijani

An Overview of Hydrogen Production from Renewable Energy Source for Remote Area Application

Hydrogen production through solar energy technology plays a very important role in the development of sustainable energy systems. Traditionally, a wide variety of methods are available for hydrogen production from conventional sources such as natural gas, coal and oil. Their application, however, contributes to emission of ozone depleting gases such as CO2. This paper reviews the recent developments of hydrogen production methods related to solar-hydrogen production for remote area application. The methods discussed are thermochemical, photoelectrochemical and electrochemical where water is the basic raw material. From this review, the low overall efficiency of photoelectrochemical and thermochemical processes make them non-attractive for remote areas application. This paper concludes that the most suitable method for hydrogen production for remote area application is electrochemical process where electrolyzer represents the most important process to obtain hydrogen without any emission of air pollutants or greenhouse gases. This paper will be useful for manufacturers, academicians and researchers who are involved and interested in solar hydrogen system.

Simulation Analysis of the Effect of Temperature and Exchange Current Density on Power and Hydrogen Production of (PEM) Electrolyzer

The purpose of this manuscript is to analyze the effect of temperature and exchange current density on operating cell voltage, resistance and ionic conductivity of the polymer electrolyte. Equations related to mathematical models for PEM Electrolyzer based on a combination of thermodynamics fundamental and electrochemical relations of the well-known Butler-Volmer kinetic have been used to simulate the system. The result of this study shows a significant drop in membrane Ohmic resistance as the temperature decreases. In conclusion the best operation temperature that corresponds to lower voltage (1.82 V) is 80°C. At power density of about 9 W/ cm2, hydrogen flow rate of 3.5ml/min and 3.78 was observed at 40°C and 80°C respectively, this account for only about 7% increase hydrogen flow rate. These model results are found to agree well with previous published work.

Simulation and Optimization of a Stand-Alone Sustainable Renewable Energy System

This paper presents a state of the art design of a stand-alone photovoltaic (PV) system to provide the required electrical power for a single refrigeration system at Kuala Terengganu, Malaysia. The simulation result shows a total of 1849.7 kW/m2/year horizontal global irradiation available at Kuala Terengganu. After considering losses such as IAM factor, model array miss match etc, the final energy available to the consumer is 5,256 (kWh/year). The energy requirement of the refrigerator system is 83.3% of the energy available.