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Open Access Article
1 - Aging Study of Oil Impregnated Repulped and Standard Cellulose through Measuring Viscometric Degree of Polymerization
Sohrab Rahmani Rana Rahmati Ali Ramazani -
Open Access Article
2 - Environmental Optimization of Building Insulation Thickness in Warm-Dry Regions
E. Anbarzadeh S. M. Ghafoori Yazdi -
Open Access Article
3 - Environmental Optimization of Building Insulation Thickness for Cold Climates using Neural Network Method
E Anbarzadeh T Shahmohammadi -
Open Access Article
4 - Evaluation of heat transfer performance of two-phase nanofluid flow in a parabolic solar collector with eccentric absorber and solid insulation
mojtaba jamiati Hossein PourmohamadianIn this study, the flow field analysis and heat transfer of two-phase nanofluid flow in a parabolic solar collector with eccentric absorber and solid insulation have been investigated. The fluid used in this collector is nanofluid of water - Aluminium. The main aim of c MoreIn this study, the flow field analysis and heat transfer of two-phase nanofluid flow in a parabolic solar collector with eccentric absorber and solid insulation have been investigated. The fluid used in this collector is nanofluid of water - Aluminium. The main aim of current study is to investigate the effect of using eccentric absorber system and solid insulation on the energy efficiency of linear parabolic collectors. For this purpose, energy efficiency has been measured and presented for different states (including ambient temperature, fluid inlet temperature, nanofluid volume fraction, nanoparticle diameter and geometric characteristics). The study is in turbulent flow regime and in order to model it, the k epsilon turbulence model has been used. In order to solve the survival equations, the finite volume method and the SIMPLE C algorithm have been used. Different optimal models are introduced in terms of having the highest energy efficiency, and the best model is determined. Based on obtained results, the highest energy efficiency in different Reynolds is related to the novel collector and two-phase model(TPM). In the next positions, respectively, are the novel collector and single-phase model(SPM), the basic collector and two-phase model, and at the end, the basic collector and single-phase model. It was also found that as the Reynolds number increases, all modes have an uptrend. The maximum amount of energy efficiency was for the novel collector and the two-phase model at Reynolds 15000, Which is equal to 68%. Also, the maximum energy efficiency for eccentricity 20 mm at Reynolds 15000, which is equal to 74.9%. Manuscript profile -
Open Access Article
5 - Study and conducting appropriate approaches for noise reduction and presenting an equation with plans for predicting noise reduction (case study: tune boundary stations in Semnan province)
Ehsan Jamshidi alireza arghavan sadegh tarahomiIn gas pressure reduction stations, due to the equipment installed and the geographic location of the station, in order to maintain the safety and health of the station, appropriate measures are needed to measure noise and reduce noise. Due to the high noise pollution, MoreIn gas pressure reduction stations, due to the equipment installed and the geographic location of the station, in order to maintain the safety and health of the station, appropriate measures are needed to measure noise and reduce noise. Due to the high noise pollution, the TBS gas pressure stations are compared. Therefore, in this research, an appropriate model and a mathematical program to analyze the intensity level of sound at different intervals from the source of sound and various frequencies and different sound power in a non-insulated state and in insulated mode, by changing the surface density of the insulator, it examines the effect of reducing the level of sound intensity. The most important results are: Reduces the intensity of the sound by increasing the distance from the sound source. Voice intensity increases with increasing sound power at identical intervals from the sound source. As the distance from the sound source increases, the intensity of the sound decreases with decreasing frequency. With increasing insulating surface density, the level of sound balance decreases at identical intervals. Manuscript profile -
Open Access Article
6 - Modeling Energy Efficiency of Amphitheater Building of Semnan Azad University, Using InDesign Bidder Software
Mohsen Rasouli Nader RahbarEnergy consumption is high for building comfort; therefore, it is essential to explore ways to reduce energy consumption or store it. In this article, we have modeled the Amphitheater of Semnan Azad University with Designer Bilder software. The results of the modeling s MoreEnergy consumption is high for building comfort; therefore, it is essential to explore ways to reduce energy consumption or store it. In this article, we have modeled the Amphitheater of Semnan Azad University with Designer Bilder software. The results of the modeling show that the use of bricks instead of stone for the facade of the building has a lower thermal dissipation rate of 6% of the outer walls, and The use of insulation of 7 cm thick polystyrene for external walls and the use of insulating wool for the roof of the final floor with a thickness of 7 cm and the use of a window with horizontal awnings of 50 cm width, we can heat the total building load for one year 14% Optimize energy consumption ratio We have a base building Manuscript profile -
Open Access Article
7 - A review of energy efficiency in buildings by phase change materials and intelligent management system
mehdi abdoos Abdollah Khalesi Doost Hadi Kargar SharifabadOne of the most important issues in the world today is energy saving, which in the construction industry, proper thermal insulation is one of the solutions to prevent energy loss. Also, the use of new and suitable insulation materials helps us to achieve this. Energy cr MoreOne of the most important issues in the world today is energy saving, which in the construction industry, proper thermal insulation is one of the solutions to prevent energy loss. Also, the use of new and suitable insulation materials helps us to achieve this. Energy crisis, global warming and other environmental issues have always been the main motivation for researchers and engineers to look for new ways to reduce building energy consumption. Recently, the use of phase change materials to increase the thermal mass of the building has received much attention. Phase changers are organic or inorganic compounds that have the ability to absorb and store large amounts of heat energy within themselves. Due to this unique feature, using these materials can naturally delay the transfer of heat to the building for several hours during peak hours of energy consumption and therefore closer to the goal of optimizing energy consumption in the building. The use of phase change materials in the construction industry along with the proper use of the capabilities and physical properties of materials, was introduced in the world several decades ago and is now known in developed countries, while in our country the research and application of these materials in the construction industry remains almost unknown. The purpose of this article is to introduce and provide suggestions for using phase change materials to store and reduce energy consumption in the building. Manuscript profile -
Open Access Article
8 - A Mini Review of Insulation Testing Techniques for Power Cables in Transmission Lines
Pooya Parvizi Alireza Mohammadi Amidi Milad Jalilian Hana Parvizi -
Open Access Article
9 - Industrial Measuring of Pollution Effects on the Operation of High Voltage Insulations
Mohammad Mehdi Ghanbarian Mohammadreza Shariati Mohammad MohammadiHigh voltage insulators are exposed to different ambient and climate conditions the interactions of ambient condition and insulator contamination led the insulators themselves become a proper medium for conduction of current, leaving their effects on the power system. P MoreHigh voltage insulators are exposed to different ambient and climate conditions the interactions of ambient condition and insulator contamination led the insulators themselves become a proper medium for conduction of current, leaving their effects on the power system. Presently, approximate and empirical numbers are used to determine the level of contamination of the insulation. As a result ,creep internals in some area do not accord to ambient conditions and are below the design level. In this power by periodic ESDD and NSDD measurements, two method direction dust gauge DGG are used to measure the intensity of the ambient pollution on the insulator and OLCA to display and record the leaking current as appropriate criteria for the degree and type of pollution. Manuscript profile -
Open Access Article
10 - Effect of Impulse Voltage on Partial Discharge of Oil and Paper - Oil Insulators Containing Air Cavity
Seyed Mohammad Hassan Hosseini Roya Shmsali -
Open Access Article
11 - Homogenizing Electric Field of Lightning in L.P.S. XLPE Descending Conductor
Ali Amirjalali Seyed Mohammad Hassan Hosseini -
Open Access Article
12 - Optimal Location of Surge Arresters in Distribution Network Considering Reliability and Technical and Economic Factors to Reduce Costs using ICA Algorithm
Mehrdad Ahmadi Kamarposhti AbasAli Hejri