ณัฐวิทย์ ทองมงคล. Creating an Air Flow Rate Control Algorithm Affects Changes in Humidity and Temperature of The Solar Drying Plant. Doctoral Degree(Energy Management and Smart Grid Technology). มหาวิทยาลัยพะเยา.ศูนย์บรรณสารและการเรียนรู้. : University of Phayao, 2566.
Abstract:
This research aims to create an algorithm to control the air flow that affects changes in humidity and temperature of the solar drying plant. Also, it suggests energy management guidelines for economic value. The research was designing a controlling system of fans inside the dryer, creating a Raspberry Pi 3B+ board that works with a Smart Phone Display, and writing a command to control the internal equipment. The equipment was installed inside the dryer and tested for dryer operation. The two materials for the drying system were banana and water hyacinth. Air flow rates were controlled at 0.35, 0.70, and 1.05 m3/s. The results showed that moisture content could be decreased best at an airflow rate of 0. 35 m3/ s compared with other air flow rates. In addition, an intermittent flow was also investigated by determining on 50 0C temperature and 35% relative humidity which the functional control algorithm of 3 air flow rates (0. 35, 0. 7 and 1. 05 m3/ s) depended on the increasing temperature of 1, 7 and 10 0C, respectively. The results showed that the correlation equation between drying rate with relative humidity, temperature, and air flow rates. The economic analysis showed a viable investment in using an automatic solar drying system at 1. 42 years of break even, considered a short period. The net present value (NPV) equals 24,241. 90 baht, which was also suitable for reducing the amount of greenhouse gas emissions equaled to 0.67859kgCO2 e/month comparing with old system.