Conference Proceedings
http://dl.lib.uom.lk/handle/123/2099
2024-03-28T08:25:09ZFeasibility of vapour absorption based air- conditioning in industries: a case study
http://dl.lib.uom.lk/handle/123/9325
Feasibility of vapour absorption based air- conditioning in industries: a case study
Wijayatunga, PDC; Attalage, RA; Sugathapala, AGT
This paper presents the results of financial and technical feasibility of vapour absorption based air- conditioning systems (VAAC) in an industrial environment in comparison to vapour compression based systems (VCAC). The financial analysis of the study involves three possible scenarios including a waste heat recovery based system. It is concluded that the most attractive option is to install VAAC systems at the initial stages of construction of the factory premises. The other options involving existing industrial installations where waste heat recovery from standby generator units can be utilised, provide internal rates of return (IRR) varying from 1.9% to 24% and simple pay back periods vaiying from 11 years to 5 years respectively. The latter two options are applicable to existing installations.
The most attractive option for the industrial installation selected in the case study is where a VAAC system is provided to supplement the existing VCAC system. This is likely to give an IRR of 14% and a simple pay back period of 8 years under present conditions.
1999-01-01T00:00:00ZDiscovering public-places in the people – streets of New Delhi
http://dl.lib.uom.lk/handle/123/22442
Discovering public-places in the people – streets of New Delhi
Mital, R
Dayarathne, R; Wijesundara, J
Urban public spaces, in particular streets have been recognized as a major ordering element in the physical structure of the city. Spiro Kostoff goes as far as saying that without the street as a public space there is no city. Indeed it may be stated on the basis of research that links good streets to good cities that a city is only as good as its streets. What then is a good street? And how important is the street in evaluating quality of life in a city? This paper looks at some typical scenarios on streets in the capital city of New Delhi with the express intention of show casing the all-important though not always visually impressive informal people-places in public spaces. The paper also looks at the margin areas between planned and un-planned Delhi as potential people-places. Through informal market places and life on the streets on the margins it will be attempted to establish that public places are vital as necessary interfaces between the haves and the have-nots and thus that vibrant streets/ public places are essential to healthy cities. The informal and temporary character of street happenings gives the street a dynamism that is almost tangible in its celebration of the citizen. The here-today-gone-tomorrow property of street-plays, market places, chance encounters etc give the street or any place for casual public activity a constantly changing form and provides, it is felt, the opportunity for sensitivities to develop that address the feeling of belonging and ownership so essential for good democratic governance of urban centres.
2013-10-15T00:00:00ZThe spatial organization of public spaces in the ancient thought; the case of Pergamon
http://dl.lib.uom.lk/handle/123/22441
The spatial organization of public spaces in the ancient thought; the case of Pergamon
Demir, M
Dayarathne, R; Wijesundara, J
Spatial organization of public spaces has been an issue that involves social and temporal differentiations reflecting the thought systems of the communities to which they belong. These differentiations make it obligatory to assess the form of ancient thought, its conjuncture and their spatial reflections together as the period that the first appearance of the terms publicity/public were formed during. There are spatial differences that dwell upon the way of thinking and living in both the ancient era and the present day. These differences are caused by a transformation from a more public lifestyle to the self-oriented human profile in the present day. Public lifestyle here refers a composition of differentiating ideas about the understanding and interpreting all elements of life in ancient life in ancient era. At the same time a self-oriented human profile is a human profile that returns to oneself and is personalized is under the crushing capitalism which based upon the assumption that man can rule the world using technology. Therefore, tracing and depicting the historical origins of the semantic and spatial meanings of the concept of publicity, with a parallel approach to the philosophy of Arendt which interprets the critique of the modern era in reference to the ancient thought founding it to the idea of shaping the future today, constitutes the subject of this study. In this context, the ancient Pergamon has been analysed with the help of archaeological expeditions in order to define the design criteria of public spaces in the ancient period as one of civilisation the centres established in Western Anatolia that became the capital of the Kingdom of Pergamon and played a significant role. Today, the ancient Pergamon is to the north and west of the modern city of Pergamon (Bergama) in Turkey. Hence, the results of this study are expected to contribute the literature as the first step of a future comparison between ancient era and today on this subject.
2013-10-15T00:00:00ZOvercoming the degradation of arterial towns: typo-morphological studies and technological robustness
http://dl.lib.uom.lk/handle/123/22440
Overcoming the degradation of arterial towns: typo-morphological studies and technological robustness
Ranaweera, H; Pathiraja, M
Dayarathne, R; Wijesundara, J
Over the last few decades, the part of the world identified as ‘developing’ has witnessed dramatic increase in urban population, drastic changes to its urban landscapes, and the launch of separate construction markets with limited connection in terms of building procurement modes and labor allocations. Sri Lanka is no exception: the extremely limited opportunities offered by the dwindling economies of small towns in the country’s interior have triggered the migration of rural population to Colombo and other major towns, which have in turn produced radical transformations in building morphology, land use patterns and labor market structures. The small towns located along regional arteries, in particular, are morphing into continuous commercial strips without apparent structure, coordinated land use planning or good performance of its building stock. Such urban growth has come to depend on largely unskilled workers, which does not favor the production nor the industry’s ability to meet demand, thereby resulting in operational barriers and the subsequent proliferation of sub-standard building systems and processes in urban areas. This paper looks at countering the formative failures of arterial towns by developing a two-phase response. Firstly, typo-morphological studies of the urban fabric are proposed to determine the technical and functional behavior of the existing building stock, and identify the problems and potentials of the emerging building types, forms and constructional responses. Secondly, a framework for a design theory, which addresses the building challenges posed by urbanization is presented by comprehending and appropriating the organization, skill-base and internal links of various industrial actors and processes that make up the industry, because it is only within this scale that the rationale and the means for action can be found and possibly activated.
2013-10-15T00:00:00Z