Conference Papers

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Author: search.filters.author.Mangalpady, M.

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    Design of haul road lighting system. Part III: Application
    (2006) Karmakar, N.C.; Mangalpady, M.; Rao, Y.V.; Yaragatti, U.R.
    The design of haul road illumination systems based on a scientific approach is very important. Improperly planned lighting systems may provide unsatisfactory illumination and may also incur higher costs. This paper describes illumination systems designed for two haul roads using the computer programs developed in earlier stages of this work. System performances and cost are compared with the existing illumination system. Designs based on the developed programs show total potential cost savings of approximately 26% and 48% for the two systems.
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    Efficient artificial lighting system for surface mine haul roads
    (2006) Mangalpady, M.; Yaragatti, U.R.
    Haul roads within the pit are one of the critical areas in surface mines where lighting installations are not permanent due to regular advancement of the working face. Due to this reason it is very difficult to maintain the lighting standards, as specified by various regulatory bodies. Lighting in mines presents special problems because of the dark surroundings and low surface reflectance. Hence, scientific design of artificial lighting is very important to achieve the minimum required lighting standards. Authors developed software, named SURLux, in MATLAB for design of illumination system, which incorporates all the design parameters. It also computes the total cost of the lighting system. In this paper a 1.0 km stretch of haul road is designed for four different types of sources namely, 150 and 250 W high pressure mercury vapor lamps (HPMV), and 150 and 250 W high pressure sodium vapor lamps (HPSV), at various pole heights (8, 10, 12, 14 and 16 m). From the results of the study it is observed that with 16 m height pole the total annual cost for 150 W HPSV is the minimum (Rs. 87,739/-). In most of the cases the cost is high with HPMV lamps. This is mainly because of their shorter life and relatively more number of poles. In general, lamp selection is made mainly based on efficacy and suitability to each situation. However, among the feasible alternatives for any project, the variant that offers the minimum total cost is finally selected. © 2006 IEEE.
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    Energy sector reforms in India - a review
    (2008) Mangalpady, M.; Raj, M.G.
    Indian economy has been growing at a rate of 6-8 % annually during the 10th plan period (2002-07), which requires growth of basic infrastructural facilities at a still higher rate. Power sector is one of the major components of infrastructure development, which requires a growth rate of 9-10 % during the 11th and 12th plan periods (2007-2016). This requires huge amount of investments and restructuring of power sector, for which Government cannot fund the entire amount independently. Hence, private participation is necessary either as an independent venture or through public-private partnership (PPP). Electricity Act 2003 is a step in the direction of reforms by creating an environment for private participation in the generation, transmission and distribution of power in the country. The main aim of this Act is to implement proper steps for efficient and optimum use of energy resources available in India and to supply quality power at good reliability and optimum cost to the Indian consumers. However, one of the major constraints faced by the power sector is the lack of adequate R&D support. This paper attempts to throw a light on present status of Indian power sector with respect to generation, transmission and distribution of electricity.
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    Performance analysis of hybrid (WIND & SOLAR) power plant - A case study
    (2010) Jaralikar, S.M.; Mangalpady, M.
    The paper presents a case study of performance analysis of a 10 KW hybrid (wind & solar) power plant having 60:40 power generation share of wind power to solar power. The hybrid power plant performance aspects such as the total power generation capacity and generation share, power utilization capacity, Clean Development Mechanism (CDM), rate of returns, project viability (technical and commercial) etc., are studied. The paper highlights the urgency of utilizing and promoting use of non conventional or green energy sources, particularly the wind and solar energy, so as to control the environmental pollution, ozone layer depletion, deforestation, loss of biodiversity, global warming etc. It was observed that there was mismatch between the designed and actual Plant Load Factor (PLF), as well as the power generation share of the wind and solar power plant. It was also found that the Power Utilization Factor (PUF) was poor and there is very less scope for installation of solar tracking system. After the detailed analysis of results certain recommendations are made for streamlining and optimizing the power generation capacity, and also for better utilization of generated power.
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    Investigation to determine the effect of wet surface condition in mines on design of lighting system
    (2011) Mangalpady, M.; Jaralikar, S.M.
    In surface mines, where the work is carried out in the night shifts, good lighting is necessary for safe and efficient work. The reflectance of surrounding surfaces is one of the important factors, which improve the vision, in the night hours. Field studies shows that the reflectance of mine surfaces will be reduced, considerably under wet weather conditions. A laboratory set up has been developed to study the reflectivity of various mineral surfaces, in dry and wet weather conditions, which indicates that the reduction in reflectance due to wet surfaces varies from 9 to 48%, depending upon the type of mineral surfaces. The texture depth of surface has an important bearing on the specularity of a surface, when it is wet. The composition of road surface directly influences the texture of that surface, and thus its dry and wet weather specularities.
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    Energy audit of a 400/220 kV substation - A case study
    (2012) Jaralikar, S.M.; Mangalpady, M.
    The paper highlights the necessity of undertaking performance analysis and energy audit study of an electrical installation, more particularly a power substation on regular basis. A 630 MVA, 400/220 kV substation was identified and a detailed study was carried out to assess the various station performance parameters under different operating conditions. It was observed that the installed capacity of the station (transformer) was very large compared to the actual load it had to supply. Thus the station was under loaded and underutilized for the major period of its operation. This reduced the operational efficiency of the station. Secondly the incoming line voltage level was remaining high during most of the period of operation. Presently voltage is tried to be maintained by switching ON the line reactors at the receiving and sending ends of this station, switching OFF one of the 400 kV incoming lines during off peak loading conditions, thus risking the supply reliability. The present study emphasizes on the urgent need for improving the power quality, streamlining and optimizing the station capacity, operations and its loading pattern. Accordingly suggestions are proposed for the same. © 2011 IEEE.
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    Performance analysis of PV panel under varying surface temperature
    (EDP Sciences edps@edpsciences.com, 2018) Tripathi, T.A.; Murthy, Ch.S.N.; Mangalpady, M.
    The surface temperature of PV panel has an adverse impact on its performance. The several electrical parameters of PV panel, such as open circuit voltage, short circuit current, power output and fill factor depends on the surface temperature of PV panel. In the present study, an experimental work was carried out to investigate the influence of PV panel surface temperature on its electrical parameters. The results obtained from this experimental study show a significant reduction in the performance of PV panel with an increase in panel surface temperature. A 5W PV panel experienced a 0.4% decrease in open circuit voltage for every 1°C increase in panel surface temperature. Similarly, there was 0.6% and 0.32% decrease in maximum power output and in fill factor, respectively, for every 1°C increase in panel surface temperature. On the other hand, the short circuit current increases with the increase in surface temperature at the rate of 0.09%/°C. © The Authors, published by EDP Sciences, 2018.
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    Performance Testing of Diesel Engine using Cardanol-Kerosene oil blend
    (EDP Sciences edps@edpsciences.com, 2018) Ravindra, n.; Mangalpady, M.; Harsha, V.
    Awareness of environmental pollution and fossil fuel depletion has necessitated the use of biofuels in engines which have a relatively cleaner emissions. Cardanol is a biofuel, abundantly available in India, which is a by-product of cashew processing industries. In this study performance of raw Cardanol blended with kerosene has been tested in diesel engine. Volumetric blend BK30 (30% kerosene and 70% Cardanol) has been used for the test. The properties like flash point, viscosity and calorific value of the blend have been determined. The test was carried out in four stroke diesel engine connected with an eddy current dynamometer. Performance of the engine has been analysed by finding the brake specific fuel consumption (BSFC) and brake thermal efficiency (BTE). The results showed that the brake thermal efficiency of the blend is 29.87%, with less CO and smoke emission compared to diesel. The results were also compared with the performance of Cardanol diesel blend and Cardanol camphor oil blend, which were already tested in diesel engines by other researchers. Earlier research work reveals that the blend of 30% camphor oil and 70% Cardanol performs very closer to diesel fuel with a thermal efficiency of 29.1%. Similarly, higher brake thermal efficiency was obtained for 20% Cardanol and 80% diesel blend. © The Authors, published by EDP Sciences, 2018.
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    Laboratory investigation of photovoltaic panel performance under the shaded condition
    (Institute of Electrical and Electronics Engineers Inc., 2020) Tripathi, A.K.; Mangalpady, M.; Ray, S.; Parida, S.
    The most encouraging use of solar energy is its conversion into electrical energy by using solar photovoltaic (PV) panel. The performance of solar-based PV panel is undoubtedly influenced by the quantity of solar radiation, which is reaching on the panel surface. The occurrence of shading over the panel surface is a vital environmental phenomenon which affects the penetration of solar radiation to reach the overall surface area of photovoltaic cells. The shading on PV panels may happen due to trees, the formation of mists, accumulation of dirt elements on the panel surface, close by long-standing structures, shadows of different panels in its region, neighbouring structures and so on. This paper is mainly focused on the study of shading impact on the panel performance. Further, this paper also observed the influence of shading on the variation of surface temperature of the PV panel. The present study shown a significant reduction of 41.40% in the maximum power output (Pmax) of the panel due to 25% shading strength of the single cell in the panel. Moreover, it was also observed that the increase in the percentage shading strength over the panel surface shifts the maximum power point (MPP), of the panel characteristics, towards the lower output voltage, which affects the effective operation of the charge controller. Further, it was seen that the shading impact degrades the performance of the panel as well as in charge of the rise of the surface temperature of the panel. In the present investigation, it was observed that the temperature of the unshaded cell rises at the rate of 1.753%, due to the shading phenomena over the panel surface. © 2020 IEEE.
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    Analysis on photovoltaic panel temperature under the influence of solar radiation and ambient temperature
    (Institute of Electrical and Electronics Engineers Inc., 2021) Tripathi, A.K.; Ray, S.; Mangalpady, M.
    The generation of electrical energy from solar energy is one of the most promising utilization of solar energy technology and it can be achieved by the application of solar photovoltaic (PV) panel. In this paper an experimental study has been conducted to examine the effect of solar radiation and ambient temperature on the surface temperature of the solar photovoltaic panel. With the help of experimental measurements, a multi-linear regression model is developed relating the three quantities. The developed model validated with the actual measured values shows good accuracy with small values of root mean square error. During the study, the recordedvalue of maximum panel temperature was 78.50°C for the atmospheric condition which having solar radiation of 1140 W/m2 and ambient temperature of 36°C. The developed relation and subsequent outcomes of the study will help the PV panel designers and manufacturers incomprehending the effects of atmospheric parameters on the temperature of the photovoltaic panel. © 2021 IEEE