Vol. 7 No. 1 (2018)
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Open AccessArticles
Article ID: 449
Simplified Voltage and Frequency Controller for Six-phase Isolated Induction Generator Feeding Resistive Loadby Kiran Singh
Progress in Energy & Fuels, Vol.7, No.1, 2018; 222 Views, 2 PDF Downloads
This article deals with a simple and moderate Matlab /Simulink software model of voltage and frequency controller for a stand-alone (or an isolated) six-phase self-excited induction generator (SP-SEIG). A simplified programmed controller circuitry keeps the terminal voltage and generated frequency almost fixed in order to maintain the uniform generator output power despite marginal drop in machine rotor speed during variations in consumer energy demands. Dynamic simulation results verify the proposed control strategy for merely one value of resistive loading at particular instant of time period.
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Open Access
Articles
Article ID: 90
Synthesis, characterisation and electrochemical studies of Co2+ doped GdAlO3 for sensor applicationsby P K Jisha1, Ramachandra Naik1, S C Prashantha2, H Nagabhushana3, H P Nagaswarupa1, C R Ravikumar1
Progress in Energy & Fuels, Vol.7, No.1, 2018; 237 Views, 3 PDF Downloads
The structural and electrochemical properties of cobalt (Co 2+ ) doped GdAlO 3 nanoparticles have been investigated. Structure analysis was carried out using X-ray diffraction (XRD) and Transmission electron microscope technique (TEM). The electrochemical properties of the GdAlO 3 :Co 2+ (3 mol %) was measured using cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) measurements using 1 M KOH electrolyte and 1 M KOH electrolyte with 2 ml of Paracetamol. The cyclic voltammetry measurements indicate that the reversibility of the electrode reaction increases while adding 2 ml of Paracetamol. Whereas, the EIS measurements reveal that a reduction in the charge transfer resistance increases capacitance of the GdAlO 3 :Co 2+ electrode.
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Open Access
Articles
Article ID: 87
Theoretical analysis of desiccant cooling system: A case studyby Sunil Kumar, Shobhit Srivastava
Progress in Energy & Fuels, Vol.7, No.1, 2018; 202 Views, 3 PDF Downloads, 0 Theoretical analysis of desiccant cooling system: A case study Downloads
This paper presents a theoretical analysis of desiccant cooling system based on second law analysis for the environment condition of Kurukshetra, Haryana, India. Desiccant cooling system worked on ventilation and recirculation mode. Renewable energy and low grade or waste energy can be used in the system. In this analysis, coefficient of performance (COP) is to be calculated in both ventilation and recirculation  mode and found the best mode for the system according to environment condition. A very few studies have done on the second law aspects of these system. The reversible COP depends on the operating parameters and the analysis is based on certain operating conditions for the desiccant dehumidifier. The thermal and reversible COPs of an open desiccant cooling system depend on operating conditions of the system. A second law analysis is performed and reversible COPs are 2.26 and 2.56 in ventilation and recirculation mode respectively at ambient condition for month of May 43.3 ◦ C and 20%RH of Kurukshetra, Haryana. The results of the analysis provide an upper limit for system.
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Open Access
Articles
Article ID: 443
Investigation of the Effect of Nono-silica Particles on Heat Specific Properties of Water Based Drilling Fluids and Rheological Propertiesby Amin Ahmadi1, Mahmood Monjazi2, Borzu Asgari Pirbaloti1
Progress in Energy & Fuels, Vol.7, No.1, 2018; 212 Views, 4 PDF Downloads
The drilling fluid or drilling mud plays various roles during drilling operations, including well cleaning, cooling, supplying necessary pressure on the well, cooling drilling bit; if correctly done, it will increase its lifespan and improve drilling performance. One of the most important properties associated with heat transfer into the well is the specific heat capacity. Increasing the special heat capacity of drilling mud improves the heat transfer in both streaming and static conditions, because this parameter improves the convection heat transfer coefficient. Today, many studies have been carried out on nanotechnology applications in the industry. Useful studies have been conducted on various industries in the field of heat transfer. The application of nanotechnology in drilling mud has not been deeply investigated to improve the performance of drilling mud during heat transfer. In this study, the impact of silicon oxide nanoparticles on improving the performance of heat transfer behavior and specific heat capacity of drilling mud is examined. Due to the structure of nanoparticles that enter the fluid as tiny and active particles, this additive is expected to improve the heat transfer process; and also the selection of nano-silicon, as a less expensive material, is also cost-effective. The results of this study indicate that a mixture of nano-silica along with polymer materials with a combination of specific concentration leads to presentation of a drilling fluid with a better control over the rheology and an increase in the thermal heat transfer coefficient due to the increase of the specific heat capacity, resulting in improving the performance of drilling fluid.
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Open Access
Articles
Article ID: 452
Redox Flow Batteries Applied For A Green Future—In The Perspective of Heat and Mass Transferby Qian Xu, Qiang Ma, Weiqi Zhang, Fen Qiao, Lei Xing, Huaneng Su
Progress in Energy & Fuels, Vol.7, No.1, 2019; 288 Views, 4 PDF Downloads, 0 Redox Flow Batteries Applied For A Green Future—In The Perspective of Heat and Mass Transfer Downloads
The global energy crisis is making energy storage as a critical technology in the use of renewable energy sources, such as solar and wind power, which have the intermittent nature. Among emerging technologies, the redox flow battery (RFB) is a promising candidate for large-scale stationary storage applications due to its unique features, including tolerance to deep discharge without any risk of damage, long lifetime, independance of power and capacity, and simple structure. However, the RFB technology is still hindered by several challenging issues before its widespread commercialization. For given electrolyte and electrode materials, the performance of the RFB is basically determined by the heat, mass and charge transport characteristics on the electrolyte-electrode interface and in the porous electrode. A better understanding of these coupled characteristics thus becomes essential for improving the battery performance. Hereby, we present a mini-review to reveal the recent progresses in RFB, with an emphasis on understanding the transport characteristics as well as the effects of operating conditions. By careful arrangements of flow regime and operating temperature, the cell performance as well as system efficiency can be greatly improved. In addition, some key transport parameters can be determined via electrochemical method using a RFB structure. Finally, a better criterion for cell performance evaluation is proposed.
