Earth to air heat exchangers made by iron, aluminium, copper and poly-ethylene pipe for single greenhouse heating were experimented and blowers. Earth to air heat exchanger was installed by pipelines in earth tube at 70cm depths and air blower was the heating capacity 3kW/h, As the result, Temperature difference due to temperature history of the inlet and outlet air on the various type in earth tube in greenhouse showed that air temperature at the various type in earth tube, comparison tube were make no difference respectively. Under the experimental condition, heat fluxes and heating load were showed 6,800Kcal/h, 19,699kcal/h generally yield of Lactuca Sativa cultured during days of sowing 90day in greenhouse using copper pipe was 170% incleased.

Abstract
 1. 서론
 2. 재료 및 방법
 3. 결과 및 고찰
  3.1 지중 매설관 종류별 입 ․ 출구 온도 변화
  3.2 지중 매설관 종류별 지중 깊이에 따른 지온 변화
  3.3 외기온에 따른 온실 내부온도변화
  3.4 매설관 입출구의 온도에 따른 열교환량 및 온실난방부하
  3.5 지중 매설관 종류별 상추의 생육 특성
 4. 결론
 참고문헌

• 백이(농촌진흥청 국립원예특작과학원 시설원예시험장) | Yee Paek
• 전종길(농촌진흥청 국립원예특작과학원 시설원예시험장) | Jong-gil Jeon
• 윤남규(농촌진흥청 국립원예특작과학원 시설원예시험장) | Nam-kyu Yun
• 강금춘(농촌진흥청) | Geum-Choon Kang
• 이시영(농촌진흥청) | Si-Young Lee