The area of greenhouse heating is 21,202 ha which becomes 42% among the total greenhouse area. As heating fuel, diesel or oil is usually used by 60%, and the heating cost takes 30 to 40% percentage at the greenhouse running. In this study, the pellet fuel heater was developed to replace oil for reducing the burden of greenhouse heating cost. The pellet fuel heater was composed of a conveying grate stoker, which could control temperature precisely like the diesel heater. Diesel and pellet were used for the greenhouse heating, whose calorific values are 9,200 and 3,898 kcal/kg, respectively. As the heating cost due to the saving effect of pellet fuel heater compared with diesel, greenhouse heating cost was reduced by 44% with pellet

Abstract
 1. 서론
 2. 재료 및 방법
 3. 결과 및 고찰
  3.1 컨베이어화격자 펠렛 공급 및 연소방식 설계
  3.2 연소실 및 온수 열교환시스템 설계
  3.3 불씨유지시스템 가동에 따른 화격자 온도유지 성능
  3.4 펠렛 공급에 따른 공급수 온도 변화
  3.5 펠렛 공급에 따른 공급수 온도 변화
  3.6절 연료소모량 비교
  3.7절 부분예산법에 의한 경제성 분석
 4. 결론
 References

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• 전종길(농촌진흥청 국립원예특작과학원 시설원예시험장) | J. G. Jeon
• 김형권(농촌진흥청 국립원예특작과학원 시설원예시험장) | H. K. Kim