Faculty Publications

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    A novel strategy to save energy consumed in electric water lifting for multi storied buildings
    (2007) Kappali, M.; Kumar, U.
    Electric water pumps have become almost an essential commodity for urban households. Existing practice of water lifting in multi-storied buildings employs Top Floor Storage Method (TFSM). Here considerable amount of water is pumped to unnecessary heights, resulting in energy wastage. This paper presents a novel scheme "Individual Floor Storage Method" (IFSM). Here water is pumped to the required optimum heights thus saving energy. Proposed method is analyzed for two different cases: (i) A two-storied house and (ii) A three-storied student hostel. The energy saving is to the extent of 10% for the first case and 20% with the payback period of 3.5 years for the second case. As a concept, IFSM is very simple and economic. It yields greater benefits i.e. higher energy saving if implemented for multistoried buildings with large water consumption like hospitals, hostels, flat complexes etc. In the present day scenario of mushrooming multi storied buildings and escalating energy costs, IFSM is more appropriate compared to the existing TFSM.
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    Electrical energy conservation in India - Challenges and achievements
    (2009) Kamalapur, G.D.; Yaragatti, R.Y.
    The gap between electrical energy supply and demand is continuously increasing despite huge outlay for energy sector since independence. This gap between supply and demand of energy can be bridged with the help of energy conservation which is considered as a new source of energy and envinronmental friendly. The energy conservation is cost effective with a short pay back period and modest investment. There is a good scope of energy conservation in various sectors, viz domestic, industry, agriculture. The planners have already started appreciating the role and significance of energy conservation in future energy scenario of India. An attempt is made in this paper to acess the achievements and further challenges of electrical energy conservation in Indian context.
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    Enhancing energy efficiency of auxiliary power system in a 210 MW coal fired power plant through energy efficiency
    (2010) Mandi, R.P.; Seetharamu, S.; Yaragatti, U.R.
    This paper describes the results of energy conservation measures in various thermal power plants spread over the country. Energy savings in various major auxiliaries are summarized here with improved performance. Staggering of auxiliary loads, reduction in hydrodynamic resistance of pipes and ducts, adoption of new energy efficient technologies, efficient control techniques, reduction in furnace ingress and monitoring of coal size at mill inlets will lead to substantial amount of energy savings. The energy conservation schemes are economically attractive with a break even period of 1 to 5 years. ©2010 IEEE.
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    Experimental Study on Detection of Household Electrical Appliance Energy Consumption Deviation
    (Springer Science and Business Media Deutschland GmbH, 2024) Nayak, R.; Jaidhar, C.D.
    The energy efficiency of buildings is compromised due to the wastage of power and the unidentified abnormal power consumption. Identifying the patterns within a dataset that drastically vary from the usual pattern or behavior is known as anomaly detection. With anomalous power consumption detection, it is possible to respond quickly to problems like malfunctioning appliances, energy waste, or unusual usage patterns, improving energy management, reducing costs, and improving safety. This work is an experimental study on detecting electrical appliance energy consumption deviation using a micro-moment labeled appliance power consumption dataset named ‘SimDataset’. Two sets of experiments were conducted: the first was by using the original dataset without removing any features, and in the second experiment, highly correlated redundant features were removed from the original dataset. Experiments are conducted based on an 80:20 split of the dataset and also on tenfold cross-validation. Experimental results depicted that the Random Forest (RF) classifier performed best, and its performance is consistent among different experiments. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.
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    Design of haul road lighting system. Part II: Design based on optimal cost considerations
    (2006) Karmakar, N.C.; Mangalpady, M.; Rao, Y.V.; Yaragatti, U.R.
    The proper selection of lighting installations is very important for the provision of cost-effective lighting systems without compromising light quality. In this study a computer program was developed to evolve a cost-effective lighting system for haul roads in surface mines. This program is beneficial in assessing the viability of various lighting installations in order to achieve cost-effective solutions. Using the program, illumination design was studied for an 800 m long stretch of haul road. Nine different types of light sources were considered at mounting heights of 12 m and 16 m. The study shows that at a 12 m mounting height, 100 W high-pressure sodium vapour (HPSV) lamps offer the most cost-effective design, followed by 250 W HPSV lamps. In the case of 16 m pole heights the annual lighting cost is minimum for 150 W HPSV lamps, followed by 250 W HPSV lamps. This work also shows that optimum design based on energy consumption need not be the same as design based on optimum cost considerations as cost parameters may vary widely with location.
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    Design of haul road lighting system. Part I: Design based on optimal energy considerations
    (2006) Karmakar, N.C.; Mangalpady, M.; Rao, Y.V.; Yaragatti, U.R.
    Electrical energy consumption is a major cost component of haul road lighting. Haul road lighting depends on many parameters such as type and wattage of sources, mounting height and tilt angle of light fixtures. In this study a computer model has been developed for optimum energy consumption of any haul road lighting system. Using the program, illumination design was studied for a stretch of 800m long haul road. Nine different types of light sources were considered for mounting heights of 12 and 16m. High-pressure sodium vapour (HPSV) lamps of 100W proved to be energy efficient at a 12m height whereas at 16m height, energy consumption was minimum for 150 W HPSV lamps. Thus the developed computer program proved to be successful in evaluating the performance of lighting designs from the point of view of energy consumption.
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    Case study of a hybrid (Wind and solar) power plant
    (2011) Jaralikar, S.M.; Mangalpady, M.
    The paper highlights the urgency of utilizing and promoting use of non conventional sources, particularly the wind and solar energy, so as to control the environmental pollution, such as ozone layer depletion, deforestation, loss of biodiversity, global warming etc. As a case study, the various performance factors of a 10 kW hybrid (wind and solar) power plant, which is having 60:40 power generation share of wind power to solar power were analysed. The study shows that there is 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 plant utilization factor (PUF) was poor and that there is very less scope for installation of solar tracking system. Based on the detailed analysis of obtained results, certain recommendations were made for streamlining and optimizing the power generation capacity, and also for better utilization of generated power.
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    Adsorption of benzene vapor onto activated biomass from cashew nut shell: Batch and column study
    (Bentham Science Publishers, 2012) Suresh, S.; Vijayalakshmi, G.; Rajmohan, B.; Subbaramaiah, V.
    The preparation of chemically modified activated cashew nut shell (ACNSB) of different impregnation ratios and their effects in adsorption of benzene vapor were studied. Effects of chemical pre-impregnation using phosphoric acid at different ratios (1:1 and 2:1) were investigated in order to patent. Physico-chemical characterization including surface area, scanning electron microscopy, energy dispersive X-ray spectroscopy, High-resolution Transmission Electron Microscopy and Fourier transform infrared spectroscopy of the ACNSB before and after benzene adsorption have been done to understand the adsorption mechanism. Optimum conditions for benzene removal were found to be, adsorbent dose m=10 g/l of solution and time (t) 120 min for the C0 range of 300-500 mg/l. Adsorption of benzene followed pseudosecond-order kinetics. Langmuir and R-P isotherms were found to best represented data for benzene adsorption onto ACSNB. In ACNSB column experiments, it can be concluded that concentration of benzene increases with the longer breakthrough time and hence higher adsorption capacity. ACSNB are many advantages includes simple and fast, organic solvent recovery, economical, energy savings, environmentally safe aspect and minimize the waste management problem. © 2012 Bentham Science Publishers.
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    Control of CO2 emission through enhancing energy efficiency of auxiliary power equipment in thermal power plant
    (Elsevier Ltd, 2014) Mandi, R.P.; Yaragatti, R.Y.
    This paper describes the results of energy efficiency enhancement in 23 numbers of 210 MW coal fired power plants spread over India. Energy efficiency improvement of major auxiliary equipment with different plant load factors are summarized here with improved performance. The effect of plant load factor on all major auxiliary equipment and improvement in performance of auxiliary equipment are discussed in this paper. Operation of the plant at improved plant load factor reduced the specific auxiliary power from 11.23% at 70% PLF to 8.74% at 100% PLF that reduced the net auxiliary power by 9.1 MU/year that is an equivalent reduction of CO2 emission by 9500 t/year. Optimizing the excess air, controlling the furnace ingress, enhanced energy efficiency of individual equipment by proper maintenance, etc., improves the plant capacity and reduces the overall auxiliary power by about 1.5-2.1% of gross energy generation i.e., equivalent CO2 reduction of 23,000-32,400 t/year and release an additional power of about 3.5 MW (for a typical one 210 MW power plant) into grid. © 2014 Elsevier Ltd. All rights reserved.
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    Thermal and energy saving analysis by using tinted double window glass combinations for heat gain in buildings
    (Regional Energy Resources Information Center (RERIC) rericjournal@ait.ac.th, 2018) Gorantla, K.; Saboor, S.; Babu, A.; Ranga, P.; Setty, T.
    Buildings consume large amount of energy to accommodate thermal and visual comforts, in which glass windows play an important role as we used as building envelope. Universally clear glass is used as chief building envelope for buildings. As clear glass is having more transmission property it permits more radiation and day light into the buildings which creates uneasy feeling to the occupants. This paper presents the experimental measurement of spectral characteristics of three tinted glasses which include transmission and reflection in entire solar spectrum wavelength region from 300nm to 2500nm as per ASTM standards by using UV 3600 Shimadzu spectrophotometer. These measured spectral characteristics were used to compute solar optical properties as per British standard by using MATLAB code. To find the total solar radiation through double tinted window glass combinations GC1 to GC6 place as building envelopes of New Delhi climatic zone by using MATLAB code and to find the monthly solar radiation passing into the building which is helpful to calculate the cost energy saving annually for cooling and heating loads. From the results GC6 combination windows are saving cost i.e. 61.16 (US Dollars/year) in south, 60.54 (US Dollars/year) in south east and 59.23 (US Dollars/year) in south west orientations annually than other combination windows.