In this study, high thermal efficiency and eco-friendly coffee roaster is developed. The core element of coffee roaster is a roasting drum and most of the coffee roasting drum is a flat cylindrical barrel type. From the traditional shape of cereal puffing machine, we got the idea of the roasting drum. Oak barrel shape is well known high thermal efficiency system in korean heating cook system. Therefore, we designed the coffee roaster containing the oak barrel shaped drum and combustor nozzles which has an ability of roasting 3kg of coffee beans within 10 minutes of roasting time. With our developed coffee roasting machine, the heating speed of roasting process is very fast, and the roasting of coffee beans can be quickly finished. We experimented the roasting time and compared the results with other coffee roasting machines of the same amount of roasting capacity. The results were outstanding in roasting time and the quality of roasting. In spite of smaller fuel consumption, the roasting time was more shorter than flat cylindrical roasting drum.

ABSTRACT
 1. 서 론
 2. 로스터기 구성요소 개발
  2.1 배출가스 저감형 커피 로스팅기의 구성
  2.2 드럼의 형상 설계
  2.3 고효율 에너지 연소기 노즐의 개발
  2.4 커피 로스팅기의 외관 설계
 3. 성능 실험과 결과 고찰
  3.1 실험장치 및 방법
  3.2 실험결과 및 고찰
 4. 결 론
 References

• 이태연(division of Mechanical & Biomedical Eng., Gangneung-Wonju National University) | Tae-Yeon Lee Corresponding Author
• 신준(Gangneung-Wonju National University) | Joon Shin