Browsing by Author "Ramanayake, VS"

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item: Thesis-Abstract
Energy conservation on a central chiller plant
Ramanayake, VS; Udawatta, L; Witharana, S
Air-conditioning is no more treated as a luxury but a day to day requirement essential for the human comfort and productivity. When compared among different sub systems of a building, air-conditioning subsystem is responsible for the largest proportion of the energy consumption especially in a tropical climate like Sri Lanka. Central air-conditioning that comprise of a chiller plant is the most common means of air-conditioning in large commercial buildings. Hence successful energy optimizations that are implemented on a central chiller plant will definitely result with large financial savings. Even though it is a known fact that all individual components that comprise a central chiller plant are now optimized in terms of energy efficiency, the overall behavior of the entire system once these pieces are put together is something that has to be separately worked out. This research proposes and implements energy optimizations on top of a central chiller plant. It evaluates the amount of saving from each optimization and presents a practical model to follow in a similar plant. Energy optimizations proposed in this research were implemented in conjunction with the capabilities of the central chiller plant control system that is already available at the site for the purpose of real time monitoring and controlling of the central chiller plant. Results of energy saved was quantified using the run hour reading gathered prior and after the implementation of the optimizations. A saving of 15.8% from COW pumps, 23.8% from CHW pumps and 32.8% from CTs were achieved as a result of those optimizations. Outcomes of this research can be made use by different parties including investors and decision makers of buildings to promote similar energy saving projects in their organizations.
item: Thesis-Abstract
User's perspective of bandwidth as a scarce resource
(2014-08-06) Ramanayake, VS; Nanayakkara, V
With developments of the new economy, Internet has become an essential commodity for any organization to carry out their day to day business activities efficiently. It is an obvious fact that the real effectiveness of the Internet depends on its reliability: availability and usable speed. With advancements of the technology (both hardware and software) the availability of the Internet is no more a problem to be solved. But, still a typical complain of any organization is the speed of the Internet. Even though it is accepted that the speed is a relative facto:;; compared with an external resource or prior speed of the same resource, it plays a major role on the satisfaction of the users. When the internet service is provided to the users of an organization as a shared resource, the effective speed of the resource depends on the usage and behaviors of its users. Hence we can simply treat the internet bandwidth as a scarce resource to which the users compete (intentionally or unintentionally, directly or indirectly) to enhance their share. This research is targeted to identify such behaviors of the users in a corporate internet. The research is based on a case study carried out among internet users at University of Moratuwa.