Browsing by Author "Nupehewa, JM"

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    item: Conference-Abstract
    Bed shrinkage in packed bed biomass combustion
    (Engineering Research Unit, Faculty of Engiennring, University of Moratuwa, 2016-04) Adassuriya, TL; Jayatillake, KDKY; Nupehewa, JM; Kaluhendiwela, YC; Narayana, M; Jayasekara, AGBP; Amarasinghe, YWR
    This paper focuses on evaluating shrinkage of a biomass packed bed. A laboratory scale packed bed is designed to conduct experiments in batch mode. Different types of biomass i.e. Ginisiriya, coconut shells and rubber are used for the packed bed to study the behavior of bed shrinkage. The model uses inlet air stream at room temperature as the gasifying medium and a fixed batch of biomass. Ignition of the biomass batch is initiated by an external heat source. Further operation is maintained by the own heat emitted by combustion reactions, until the whole batch is finished. As the time goes height of the packed bed is decreasing due the shrinkage of the bed. Empirical data obtained from this model can be used to evaluate the bed shrinkage and temperature variations in solid phase and gas phase with time.
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    item: Conference-Full-text
    Capacitance and tan δ measuring equipment for high voltage insulation modelling and simulation modelling and simulation
    (IEEE, 2016-05) Gamage, CM; Nupehewa, JM; Kodikara, KKCS; Chathuranga, SAD; Samarasinghe, R; Lucas, JR; Jayasekara, AGBP; Bandara, HMND; Amarasinghe, YWR
    Capacitance and tan δ measurements are usually carried out to check the healthiness of an insulation. Measuring equipment based on different methodologies to test insulation in cables, transformer bushings etc. are available. This paper presents the development of such a measuring equipment for a high voltage (HV) laboratory of a University. The design is divided into three parts as filter unit, test unit, and the measuring unit. These units are separately modeled and simulated using software (MATLAB and PSpice). Filter unit and the test unit are combined to analyze the results through simulation. Simulation results are used to improve the design.