Abstract:
Cleanroom is a controlled environment, where temperature, relative humidity, air velocity, air pressure and suspended particle are regulated for manufacturing products according to customer's requirements. Because of steady humidity requirement, air conditioning systems have to be run at all time. According to the records of electricity consumption of voice coil motor industry, its consumption rate of year 2009 and 2010 for air conditioning systems in all cleanrooms had increased from 40.35% to 41.68% with respect to the total amount of the electricity consumption of the whole factory. Statistics and recorded abnormalities of all production activities were brought into analyses for determining correlations between temperature and relative humidity base on a simple linear regression model and Multiple regression model. Then the determined model with an assumption that temperature set point in each clean room was increased for 1 degree Celsius, and humidity set point in each clean room was increased for 1% was employed to simulate a plausible decrease in cost of electricity. It was found that the cost of electricity would be saved about 5,9695,556 baht within 24 months if increase temperature set point in each clean room for 1 degree Celsius, and also increase humidity set point in each clean room for 1%