In this paper, an attempt has been made to obtain nonsensitive solutions in the multi-objective optimization of a photovoltaic/thermal (PV/T) air collector. The selected objective functions are overall energy efficiency and exergy efficiency. Improved thermal, electrical and exergy models are used to calculate the thermal and electrical parameters, overall energy efficiency, exergy components a...

The efficiency of conversion of electrical power into fluidic power in an electrohydrody-namic (EHD) pump depends on the bulk fluid velocity. An analytical formulation is developed for calculation of the efficiency of an EHD pump, with and without the presence of a superimposed flow due to an externally imposed pressure gradient. This formulation is implemented into a numerical model, which is ...

Silicon Carbide and diamond Schottky barrier diodes (SBD) with an original and high efficiency termination are presented. The influences of termination parameters on the diodes electrical performance are investigated for both punch-through (PT) and non punch-through (nPT) structures by simulations. Design guidelines, based on simple analytical expressions, for ideal SBDs are included. Electrica...

The benefits are demonstrated of using exergy to understand the efficiencies of electrical power technologies and to assist improvements. Although exergy applications in power systems and electrical technology are uncommon, exergy nevertheless identifies clearly potential reductions in thermodynamic losses and efficiency improvements. Various devices are considered, ranging from simple electric...

About 20% of the electricity produced in the world is consumed in rotary equipment for conveying fluids such as water, gas, air, and other liquids, while the loss of energy consumption in this sector is more than 60%. The aim of this study is to evaluate different efficiencies in the pumping stations in the pressurized irrigation systems to address low energy efficiency issues in the pump stati...

abstract background: heavy metals in industrial wastewater especially chromium (vi) are considered as the main environmental pollutants. methods: electrochemical cell made of plexiglass with a volume of 1.95 lit was used. iron and graphite electrodes, electricity conductor, each with dimensions of 0.1×3×10 cm (width×length×height) were designed and built. tests were carried out in various condi...

Considering that the natural sources of the earth are limited, it is necessary to produce economical electrical machines with a high efficiency through better design and a proper selection of materials. At present, magnets have a high energy product (BHmax) with suitable magnetic and physical properties for applications in electrical machines. This paper considers how an electrical engineer cou...

It is predicted that energy consumption will increase by 56% between year 2010 and 2040. To cope with this upcoming energy demand, innovative technologies have been developed in recent decades to harvest energy from the environment such as wind, solar, tide and vibration. Harvesting energy from structural vibration presents two major challenges: efficiency and vibration control. In particular, ...

We developed a system that gave electrical stimulation with intensity in proportion to the voluntary EMG through the EMG recording electrodes, and used it for hemiplegic traning. The training effect was observed in long (a month of the training) and short (ten minutes after the training) period. We investigated this training effect of this system physiologically. We carried out two experiments;...