การพัฒนาเครื่องอบแห้งสับปะรดท่าอุเทนด้วยพลังงานแสงอาทิตย์ร่วมกับรังสีอินฟราเรดที่ควบคุมอุณหภูมิและความชื้นสัมพัทธ์ด้วยระบบอินเทอร์เน็ตของสรรพสิ่ง

Songpol  Wijanjak; Umphisak  Teeboonma; Apinunt  Namkhat; Songsupa   Pumchumpol; Athiwut  Sanpoka; กานต์ กอมณี

Authors

Songpol Wijanjak Program of Mechanical Technology, Faculty of Industrial Technology, Nakhon Phanom University
Umphisak Teeboonma Program of Mechanical Engineering, Faculty of Engineering, Ubon Ratchathani University
Apinunt Namkhat Program of Mechanical Engineering, Faculty of Engineering, Ubon Ratchathani University
Songsupa Pumchumpol Program of Mechanical Engineering, Faculty of Engineering, Ubon Ratchathani University
Athiwut Sanpoka Program of Mechanical Technical Education, Faculty of Technical Education, Rajamangala University of Technology Isan Khonkaen Campus
กานต์ กอมณี Program of Mechanical Technology, Faculty of Industrial Technology, Nakhon Phanom University

Keywords:

Solar drying, Infrared drying, Internet of Things

Abstract

This study evaluated the performance of a solar–infrared hybrid dryer for Tha Uthen pineapples with Internet of Things control (SD-IR-IoT). The system was compared with a solar dryer with IoT control (SD-IoT) and a traditional solar dryer (TSD). Experiments were conducted under identical environmental conditions from 09:00 to 17:00. A 200 W infrared heater was used to maintain the chamber temperature between 50 and 70°C. The exhaust fan was controlled to operate within a relative humidity range of 30–50 %. The results showed that SD-IR-IoT maintained chamber temperatures 5–45% higher than the other systems. It also reduced the average relative humidity by 10–30%. As a result, the moisture ratio decreased from 1.0 to approximately 0.15 within 8 hours. In contrast, the final moisture ratios of SD-IoT and TSD were 0.35 and 0.50, respectively. The drying rate of SD-IR-IoT ranged from 0.4 to 0.8 g/min. This rate was clearly higher and more stable than those of the other systems. The economic analysis indicated a payback period of only 0.36 years. The findings demonstrate that integrating solar energy, infrared heating, and real-time IoT control improves temperature stability, enhances the drying rate, and provides strong economic feasibility. The system is suitable for community-level and small-scale agricultural applications

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