Fluid frictional hot-water system consisted of power supply equipment, a motor, fluid heater, fluid tank, circulating pump, fan, flow meter and a heat exchanger. The system had a motor of power capacity 15.2kw/h, light-oil hot air heater in control plot had the heating capacity 20,000kcal/h, by the performance test result, it could supply heat from 24.6 to 28.1 kw depending on the motor, respectively. Thermal efficiency of fluid frictional heater were 88.1% to 91.0% in the same conditions. As the result, a deviation of indoor air temperature between the treatment plot and the control plot was about 2℃. It was heating cost of the each system heater and light-oil hot air heater heating cost were 742,200won, 2,266,000won. therefore heating cost saving was 67%. Yield of tomato cultured in greenhouse with fluid frictional hot-water system was high as 4%. As a result, the fluid frictional hot-water system was 48% higher in economics than the hot air heater.

Abstract
 1. 서론
 2. 재료 및 방법
 3. 결과 및 고찰
  3.1 시간에 따른 물탱크 유량, 입출구 온도 및 소비전력량의 변화
  3.2 시간에 따른 온풍기 유량, 입출구 온도 및 소비전력량의 변화
  3.3 월별 난방비용 및 에너지 사용량
  3.4 경제성 분석
 4. 결론
 참고문헌

• 백이(농촌진흥청 국립원예특작과학원 시설원예시험장) | Y. Paek
• 전종길(농촌진흥청 국립원예특작과학원 시설원예시험장) | J. G. Jeon
• 윤남규(농촌진흥청 국립원예특작과학원 시설원예시험장) | N. K. Yun