Master of Science in Building Services Engineering
http://dl.lib.uom.lk/handle/123/46
2024-03-29T09:09:22ZFeasibility study on tubular skylights to be used in Sri Lankan office buildings
http://dl.lib.uom.lk/handle/123/12160
Feasibility study on tubular skylights to be used in Sri Lankan office buildings
Kumara, BYBCP
Tubular Daylight Guidance technology can deliver natural light in to a space in a building where daylight is limited with an internally mirrored pipe system using the phenomena called total internal reflection. This research has been conducted to identify the potential and feasibility of applying Tubular skylights in a Sri Lankan office building. The research has focused on the existing technologies and evaluated three models of Tubular skylights designed to be used in office applications. Computer simulations have been carried out to evaluate the light out puts of different lighting arrangements made with Tubular skylights. Energy evaluations have been carried out for the cases require artificial lighting to keep constant illuminance levels. Economic evaluations have been carried out with life cycle cost calculations to evaluate the economic feasibility.
Strategic guidelines for selection of best energy efficient air conditioning system/equipment for commercial buildings in Sri Lanka
http://dl.lib.uom.lk/handle/123/11467
Strategic guidelines for selection of best energy efficient air conditioning system/equipment for commercial buildings in Sri Lanka
Perera, KAK
Air conditioning was considered a luxury in earlier days and now it becomes a general requirement due to urbanization, new constructions, modern architecture, regulations and standards etc. In early days there were no limitations on space and also there were lot of greenery which supports concepts such as natural ventilation. Therefore importance of establishing proper procedure for AC system development is great and this study aims at developing a systematic procedure for selection of efficient AC system/equipment for different type of commercial buildings. Literature review discuss broadly on technologies, standards and regulations, energy efficiency, Calculation techniques and tools, Building envelope improvements which is the flat form for development of a methodology to achieve research objective. Methodology developed consist of three phases namely Design, Testing and Commissioning, Operation and Maintenance. In Sri Lanka focus is mainly given for design phase and neglect T & C, O & M phases which is so critical for success of the project. Once methodology established guidelines have been developed for easy reference so that even layman can understand approach required for development of efficient AC system for his new building. Real time case study presented for better understanding of proposed methodology and further improvement on the study can be done by monitoring applications. Finally recommendations were given based on research study outcome for real time applications.
2015-10-15T00:00:00ZOptimum pre-cooling guidelines: applicable to commercial buildings in Sri Lanka
http://dl.lib.uom.lk/handle/123/11466
Optimum pre-cooling guidelines: applicable to commercial buildings in Sri Lanka
Narangoda, NAPSK
HVAC plants in buildings are generally started earlier than the building operation start time. That is to absorb the stored thermal energy in the building and reach the set indoor thermal condition by the time which the building operation is started. Cooling energy required during this period is called Pre-cooling energy and the early plant running time is called Pre- cooling time of the building. Thermal energy in buildings depends on pre-defined factors and predicted factors. Pre-defined factors include building envelope, envelope materials, type of HVAC system installed, Building interior, lighting, other internal heat gain factors, building operation pattern etc. Predicted factors include climatic condition in the region throughout the year. Due to the fact that precooling time is determined by both pre-defined and predicted factors, a thermal modeling study is more appropriate and recommended to assess the “pre-cooling demand and time” of buildings. The focus on this research study is to prepare an optimum “pre-cooling guidelines” for commercial buildings in Sri Lanka taking climatic variations also into account. World Trade center, Colombo, the largest commercial building in Sri Lanka was modeled in e-QUEST and results were analyzed with Colombo climatic data throughout the year to study the pre-cooling requirements (demand & time) and hence to derive a set of general pre-cooling guidelines applicable to any commercial building in Colombo.
2015-10-15T00:00:00ZPotential of cool thermal storage for an air conditioning system in a records repository building
http://dl.lib.uom.lk/handle/123/10654
Potential of cool thermal storage for an air conditioning system in a records repository building
Seneviratne, LJ
In Heating, Ventilation and Air Conditioning (HVAC), Cool Thermal Storage (CTS), is a popular demand side management technology for shifting electrical demand for cooling from peak time to off peak time periods in most of the countries in the world. However this technique is so far not successfully implemented for building air conditioning systems in Sri Lanka. This research study shows how CTS is used to reduce life cycle cost of air conditioning system for Record Repository Building (RRB) in Sri Lanka using CTS under “General Purpose Tariff” applicable for commercial buildings and “Industrial time of day tariff” applicable for industries and hotels in Sri Lanka. TRACE 700 software[3] is used to carry out a computer simulation for modeling of the air conditioning system of RRB for CTS for different scenarios such as partial storage, full storage etc against the base case of air conditioning system without CTS under “General Purpose Tariff” and “Industrial time of day Tariff”. It has been found that incorporation of partial ice thermal storage for air conditioning system of RRB the cooling capacity of chiller plants for the building can be reduced by 25% and thereby initial cost of air conditioning equipment including ice storage tanks could be reduce by 11% and maintenance cost including ice storage tanks by 8%. Further it has been found that the annual operating cost of air conditioning system incorporated with both partial and full CTS for RRB will be lesser than the annual operating cost of air conditioning system without CTS under General Purpose Tariff (Rate G.P-2) [16&17] as well as Industrial Time of Day Tariff (Two Part)- (Rate I-2 (T.D.2)) [16&17]. The life cycle cost for 20 years of both partial and full CTS for RRB will also be lesser than the operating cost of air conditioning system without CTS under General Purpose Tariff (Rate G.P- 2) [16&17] as well as Industrial Time of Day Tariff (Two Part)- (Rate I-2 (T.D.2)) [16&17]. The payback period for air conditioning system incorporated with full CTS for RRB is 8 to 9 years under General Purpose Tariff (Rate G.P-2) [16&17] and 3 to 4 years under Industrial Time of Day Tariff (Two Part) - (Rate I-2 (T.D.2)).[16&17] Key Words: Cool Thermal Storage (CTS), Record Repository Building (RRB), General Purpose Tariff (Rate G.P-2) [16&17] Industrial Time of Day Tariff (Two Part) - (Rate I-2 (T.D.2)) [16&17].
2015-02-07T00:00:00Z