Theoretical Investigation of Consumption Patterns Effect on Optimal Orientation of Collector in Solar Water Heating System

Abbas Rajabi Khanghahi; Mohammad Zamen; Mehdi Soufari; Majid Amidpour; Ali Abbas Nejad

Volume 4, Issue 1 , February 2017, Pages 1-10

  One of the subjects in solar water heater design is considering distribution of hot water consumption during the day. For example, each of the household, commercial, office, school, and industrial consumptions have a particular distribution of hot water consumption named pattern in this article. In solar ...  Read More

Research Article
Optimization of Solar Absorption Cooling System Considering Hourly Analysis

Zahra Hajabdollahi; Majid Sedghi Dehnavi; Hassan Hajabdollahi

Volume 4, Issue 1 , February 2017, Pages 11-19

  Thermal modelling and optimal design of a solar absorption cooling system are presented, and hourly analysis is performed over the period of a year. Three design parameters are considered, then the Real Parameter Genetic Algorithm (RPGA) is applied to obtain the minimum total annual cost. The optimization ...  Read More

Different Types of Pitch Angle Control Strategies Used in Wind Turbine System Applications

Ehsan Hosseini; Ghazanfar Shahgholian

Volume 4, Issue 1 , February 2017, Pages 20-35

  The most common controller in wind turbine is the blade pitch angle control in order to get the desired power. Controlling the pitch angle in wind turbines has a direct impact on the dynamic performance of the machine and fluct­uat­io­ns in the power systems. Due to constant changes in wind ...  Read More

Research Article
Thermal Pretreatment for Improvement of Biogas Production and Salinity Reduction by Zeolite

Rozita Asgari; Farida Iraji Asiabadi; Hadi Radnezhad

Volume 4, Issue 1 , February 2017, Pages 36-40

  The anaerobic digestion of organic waste for biogas production can be affected by some variables such as temperature; concentration of the biogas feed solution, bacteria populations, and pressure. This study investigated the effects of thermal pretreatment at 50, 75, and 100 ºC on the biogas produced ...  Read More

Research Article
Effect of Temperature on Electrical Parameters of Phosphorous Spin–on Diffusion of Polysilicon Solar Cells

Siamak Azimi-Nam; Foad Farhani

Volume 4, Issue 1 , February 2017, Pages 41-45

  Effects of temperature on electrical parameters of polysilicon solar cells, fabricated using the phosphorous spin-on diffusion technique, have been studied. The current density–voltagecharacteristics of polycrystalline silicon solar cells were measured in dark at different temperaturelevels. For ...  Read More

Research Article
An overview of organic/inorganic membranes based on sulfonated poly ether ether ketone for application in proton exchange membrane fuel cells

Somayeh Sarirchi; S. Rowshanzamir

Volume 4, Issue 1 , February 2017, Pages 46-60

  Nowadays, proton exchange membrane fuel cells (PEMFCs) are the most promising green energy conversion devices for portable and stationary applications. Traditionally, these devices were based onperfluoro-sulfonic acid electrolytes membranes, given the commercial name Nafion. Nafion is the mostused electrolyte ...  Read More

Research Article
Evaluation of Off-grid Hybrid Renewable Systems in the Four Climate Regions of Iran

Shoeleh Vahdatpour; Shokoofeh Behzadfar; Leila Siampour; Elahe Veisi; Mehdi Jahangiri

Volume 4, Issue 1 , February 2017, Pages 61-70

  Renewable systems influence the process of supplying domestic electricity demands. It will be useful to replace the conventional energy generation system by renewable energy sources since the uncontrolled use of fossil fuels is accompanied by global warming and environmental hazards, in addition ...  Read More