ERU - 1999
http://dl.lib.uom.lk/handle/123/14672
2024-03-29T08:04:36ZFeasibility 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.
1999-01-01T00:00:00ZProceedings of the Annual Symposium 1999 (Pre Text)
http://dl.lib.uom.lk/handle/123/20643
Proceedings of the Annual Symposium 1999 (Pre Text)
Hettiarachchi, P
1999-12-01T00:00:00ZA CCTV image grabber for vehicular parameter detection.
http://dl.lib.uom.lk/handle/123/9312
A CCTV image grabber for vehicular parameter detection.
Jayasinghe, JAKS; Nishantha, GGD
The concept of vision information has become a key feature in moden vehicular traffic control and Intelligent Vehicle Highway Systems (IVHS) [1]. Vehicle detection by video cameras is one of the most promising new technologies used in implementing advanced traffic control and management systems [2].
The CCTV Image Grabber discussed in this paper is a low cost design which can capture, store and transmit video information to a remote computer for visual site inspection and extraction of vehicular traffic parameters for adaptive control of road traffic.
1999-01-01T00:00:00ZWall effects on the performance of ceiling fans: a two-dimensional model
http://dl.lib.uom.lk/handle/123/9344
Wall effects on the performance of ceiling fans: a two-dimensional model
Sugathapala, AGT
The distance between the rotor and the ceiling wall is known to have a significant effect on the performance of ceiling fans, especially at a close proximity. A simplified ideal fluid flow model is developed to analyse this problem and predict the effect of the wall. A plane version of the classical actuator-disk model is modified by inclusion of an artificial vertical boundary downstream of the rotor to make it aerodynamically self-consistent The conformal mapping technique is then used to obtain the flow field induced by the rotor. The effects of ceiling gap on the flow rate and the aerodynamic power generated by the fan are presented. The shapes of the jet boundary for different ceiling gaps are also given. The upstream flow is diverted due to the presence of the ceiling, which results in reductions in the jet area and the flow rate and a higher loading on the rotor owing to the suction pressure at the ceiling. For an example when the ceiling gap is half of the rotor radius the reduction on the flow rate (at the same induced power) is 30% and the increase in the induced power (which produces the same flow rate) is 200%.
1999-01-01T00:00:00Z