Feasibility assessment of solar rooftop systems for gymnasium: case study of Chulalongkorn University
Chulalongkorn University is a large educational institution that has various kinds of activities, in which the cost of electricity usage is increasing almost 17% in 2018. High electricity bill has become one of the serious issues of the university. Photovoltaic system is one of the productive ways for solving this problem. The objective of this study is to
assessment and to compare the quality of solar rooftop system using in the gymnasium daily. This study leads to an analysis and suggestion for solar cell installation which can be enough for usage and battery backup. Cases of the study included three gymnasiums in Chulalongkorn University and the data was collected in the form of architecture survey, survey of electricity usage of each building, and schedule of building usage. The program of System Advisor Model Version 2018.11.11 was applied to calculate the electricity energy.
Feasibility assessment of solar rooftop systems for three gymnasiums include Indoor Stadium 1 in daytime and night time (without air conditioner), Chanthanayingyong Gymnasium in daytime and night time (with air conditioner) and Indoor Stadium 2 in night time (without air conditioner). The result revealed that photovoltaic system can produce electricity sufficiently during daytime and can reach almost 62%, 47% and 8% of daily electronic energy use. This study concludes that the building that is used in daytime and night time without air conditioner and battery backup is suitable for the investment because the cost of installation is 2-3 times as expensive as regular system. Moreover, solar rooftop system can decrease the electricity bill. The photovoltaic system can produce 336,579 KWh/year. This system can produce electricity sufficiently during daytime. It can reach almost 62% of daily electronic energy use, performance ratio is ranged in 68% and IRR 13%. The payback period is 7 years.
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