A Using of Solar Roof Top for Electrical Energy Conservation in Educational Organization

Abstract

This research presents solar roof top for electrical energy conservation. The case study is implemented in educational building in a campus of university in Thailand. To get the goal of electricity cost reducing under limited budget, the solar roof top is used in some building. This research uses surveys the electrical load data and considers the selecting of building following on the budget. The chosen building is the building of accounting department which the majority of electrical loads are air conditioner and lighting system. From the data, it is observed that electrical load consisted of 27000 W of air condition or about 74%, 4536 W of lighting or 12%, 3850 W of computer or 11% and other about 1160 W or 3% which including refrigerator, kettle and so on. The total load is 36546 W. Therefore, the 12 kW solar roof top is installed. Solar cell in type of crystalline silicon is used. The system consists of the 300 W solar panel amount 17 panels amount 2 sets the total of 34 panels, 2 commercials on grid inverter 6 kW. From the experimental results, it is found that the electrical consumption decreased 20.46% approximately 49103 kWh a year or about 5,729 dollars a year. The payback period is 4.01 years.