Faculty Publications
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Item 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.Item An approach to reduce the size and cost of PV panel in solar water pumping(2010) Kappali, M.; Uday Kumar, R.Y.Of late Solar PV generation is finding prominence as a promising renewable source of energy. Water pumping is an important application of solar PV generation. However it suffers from the demerit that the initial cost is quite high which is mainly due to the high cost of PV panels. Present paper proposes a novel approach "Individual Floor Storage Method" for solar water lifting in multi-storied buildings. In this method water is pumped to the required optimum heights thus avoiding wastage of energy. Hence the energy required will be less for a particular amount of water to be lifted. This means there will be reduction in the size of photo voltaic panel and hence in the initial cost. In the present paper, solar pumping proposal without battery backup, is worked out for a house with two floors. It's found from the tests that with the proposed new approach, PV panel size and panel cost will decrease by 13% and 11.5% respectively. ©2010 IEEE.Item Harnessing maximum power from solar PV panel for water pumping application(Springer Verlag service@springer.de, 2013) Kappali, M.; Uday Kumar, R.Y.; Sheelavant, V.R.The problem of fast depleting fossil fuels is triggering exploration of alternate sources of electricity. Among such sources, Solar Photo Voltaic (PV) energy is gaining prominence due to its plentiful availability. Water pumping is an important application of solar PV power. However people are not opting for it in large numbers as the 'cost per watt' for solar pumping systems is high. The cost component can be reduced by harnessing more power per unit installed capacity of the solar panel. One method of realising this is by Maximum Power Point Tracking (MPPT) wherein a Power Electronic (PE) converter is used to match pump with the PV panel. Present paper deals with the MATLAB based simulation study of solar PV driven Permanent Magnet (PM) DC motor (brushed) Pump System. Two cases are considered: a) System without MPPT b) System with MPPT. It is shown that by varying duty cycle of the converter at different radiation levels, the pump speed and hence the useful mechanical output can be enhanced with MPPT. The simulation study reveals that the output power becomes the maximum when the motor voltage becomes the maximum. Hence it is proposed that the motor voltage can be used as a control parameter for varying the duty cycle of the converter in achieving maximum output. © 2013 Springer-Verlag.Item Harnessing maximum power from solar PV panel for water pumping application: A simple approach(2012) Kappali, M.; Uday Kumar, R.Y.Among alternate sources of electricity, solar photovoltaic (PV) energy is gaining prominence due to its plentiful availability. Water pumping is an important application of solar PV power. However people are not opting for it in large numbers as "cost per watt" for solar pumping systems is high and the reliability is poor due to complex technology. The cost can be reduced by harnessing more power per unit installed capacity of the solar panel. One of the methods of realizing this is by Maximum Power Point Tracking (MPPT) wherein a power electronic converter is used to match pump with the PV panel. Currently "panel power" is the widely employed control parameter for MPPT. This approach can be referred to as MPPTPP. Present paper proposes load voltage as control parameter for MPPT. Varying the duty cycle of the MPPT converter such that load voltage is always maximum leads to harnessing maximum power output. This approach can be referred to as MPPTLV. Here only one parameter i.e. load voltage needs to be monitored. MPPTLV is simpler than MPPTPP as in the latter case it"s necessary to measure both panel voltage and current and then find their product. The proposed method is substantiated by theoretical explanation followed by simulation as well as experimentation results. The system considered is a standalone PV source connected to Permanent Magnet (PM) brushed DC motor driving centrifugal pump.Item Solar Load Voltage Tracking for Water Pumping: An Algorithm(Springer India sanjiv.goswami@springer.co.in, 2015) Kappali, M.; Udayakumar, R.Y.Maximum power is to be harnessed from solar photovoltaic (PV) panel to minimize the effective cost of solar energy. This is accomplished by maximum power point tracking (MPPT). There are different methods to realise MPPT. This paper proposes a simple algorithm to implement MPPTlv method in a closed loop environment for centrifugal pump driven by brushed PMDC motor. Simulation testing of the algorithm is done and the results are found to be encouraging and supportive of the proposed method MPPTlv. © 2014, The Institution of Engineers (India).