Browsing by Author "Perera, PABAR"

Now showing 1 - 5 of 5

item:
Development of an empirical model of a helically coiled steam generator for waste heat recovery
(2011) Premalhilake, MRLT; Rajapaksha, RPAKS; Hewa Bettage, MS; Perera, KKCK; Perera, PABAR; Ranaweera, RAMP
Discussions are going on today in many forums analyzing correlations between engineering applications and environmental pollutions. As a result of that, novel concepts such as green engineering have appeared in the engineering scenario. This paper describes a procedure developed for designing a helically coiled steam generator (SG) for recovering heat from the flue gas of a furnace. The design was applied to the lead melting furnace operating at Associated Battery Manufacturers (Ceylon) Ltd (ABM), Ratmalana, Sri Lanka, Most available literature deals with experimental investigations regarding correlations for heat transfer coefficients and pressure drops in helically coiled heat exchangers for both single phase and two phase flow regions. The paper presents a systematic procedure for designing a helically coiled SG through this case study.
item:
Development of energy labelling program for domestic water pumps in Sri Lanka
(2011) Kaluarachchi, KC; Madhushan, HAK; Mirando, ENL; Sugathapala, AGT; Perera, PABAR
To reduce the energy consumption in domestic sector. Sustainable Energy Authority of Sri Lanka is considering implementation of energy labelling programs for household electrical appliances. The main objective of the energy labelling program is to provide guidelines to users for selecting the best appliance rather than following the brand names without knowing their performance levels while encourage manufacturers to go for the optimal designs. This paper discusses about the performance indices which are presented in the form of a star rating that can be usedfor the energy labelling program for domestic water pumps which suits for Sri Lanka.
item: Conference-Abstract
Feasibility study on solar photovoltaic Office Air Conditioning in Sri Lanka
(2011) Perera, KAEK; Kollure, KAL; Prasad, WAKSS; Perera, PABAR; Perera, ATD; Perera, KKCK
Due to the rapid depletion of fossil fuel resources and global concern on Green House Gas emissions, sustainable energy technologies have become important in Heating, Ventilation and Air Conditioning (HVAC) systems in buildings. As a result, much focus is given on research and application based on solar powered HVAC, in various parts of the world. Such initiatives are of timely importance in Sri Lankan context due to the availability of good solar energy potential. In this work, an existing air conditioning system for an office building of 51m~ in Sri Lanka was taken into study. An economic evaluation was performed using HOMER (Version 2.68 beta) to assess the feasibility of using Solar PV (SPV) to power the air conditioning system. The results show that under present circumstances, the Levelized Cost of Energy (COE) of the optimized photovoltaic stand alone system lies far above that of the grid powered. Lt further depicts that grid integration would bring down the COE of the SPV system closer to the range of the main grid. Hence in current conditions, grid integration is the way forward for SPV assisted air conditioning in Sri Lanka.
item: Conference-Abstract
Investigation & simulation of bird flight kinematics & dynamics
(2008) Senevirathne, SWMAI; Piyathilake, BAV; Perera, BDAS; Perera, PABAR; Fernando, MARV
Birds use a simple technique to get airborne. However, mankind is still not capable of using this simple technique successfully in any applications. In this project, it has been investigated about bird flight kinematics with respect to the different flying patterns of birds, with the intension of developing a mechanism for human applications which uses such kinematics. Motions of bird wing skeleton were examined and analysed using computer software. Virtual simulations of wing patterns were also done. In addition, an innovative simulation method has been developed to acquire flapping motion by manipulation of aerodynamic forces exerted, which has minimised the number of prime movers on board.
item: Thesis-Abstract
Vibration diagnostic of rotor mechanisms in ships
(6/15/2011) Jayarathne, GG; Perera, PABAR; Wimalasiri, WK
In ships, there are so many sources of noise and Vibration such as propulsion engines and electric generators in restricted spaces and structures of ships, which are made of steel, transmit vibration well. By the reasons, noise and vibration of ships are very big by nature and reduction of noise and vibration is important subject for ships. Regarding noise reduction, reduction of noise cause by vibration has difficulty and the major part of such noise is structure born noise. "Vibration" is not a problem. It is a physical manifestation of machinery imperfection. It is used to help find obvious and subtle deviations in machines. No machine runs perfect. "Diagnosis" is the Method of Detection. If, a fault develops and goes undetected, then, at best, the problem will not be too serious and can be remedied quickly and cheaply; at worst, it may result in expensive damage and down-time, injury, or even loss of life. There is no reason or excuse to have machinery operate unprotected. The areas of interest in vibration measuring in plant maintenance are general measurement, analysis, and corrective. All rotor mechanisms in ships consist of shafts, bearings, couplings, gears etc. These machinery operate under various load conditions from light to heavy. Ship propulsion system comparatively works under very heavy load conditions with rolling and pitching of the ship which may tend to cause overstressing of shafts.