Journal of Biosystems Engineering

Korean Society for Agricultural Machinery (한국농업기계학회)
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Analysis of Optimum Water Cooling Conditions and Heat Exchange of LED Lamps for Plant Growth

식물생장용 LED 램프의 적정 수냉조건 및 열교환량 분석

  • Park, Jong-Ho (Dept. of Bioindustrial Machinery Engineering, Chonbuk National University) ;
  • Lee, Jae-Su (Dept. of Bioindustrial Machinery Engineering, Chonbuk National University) ;
  • Kim, Dong-Eok (Dept. of Agricultural Engineering, National Academy of Agricultural Science) ;
  • Kim, Yong-Hyeon (Dept. of Bioindustrial Machinery Engineering, Chonbuk National University)
  • 박종호 (전북대학교 생물산업기계공학과) ;
  • 이재수 (전북대학교 생물산업기계공학과) ;
  • 김동억 (국립농업과학원 농업공학부) ;
  • 김용현 (전북대학교 생물산업기계공학과)
  • Received : 2011.09.16
  • Accepted : 2011.10.13
  • Published : 2011.10.25
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Abstract

This study was conducted to compare the characteristics of heat dissipated from LED lamps with water cooling method and natural cooling method in a closed-type plant production system (CPPS) and to determine the optimum water temperature and flow rate for LED lamps with water cooling method. The experiments were performed in CPPS maintained at temperature of $24^{\circ}C$ and humidity of 70%. As compared to the LED lamps operated at water temperature of $22.5{\pm}1.2^{\circ}C$ and flow rate of $1,521{\pm}3.3\;mL{\cdot}min^{-1}$, air temperature under LED lamps with natural cooling was approximately increased by $1^{\circ}C$ and photosynthetic photon flux was decreased by $10{\mu}mol{\cdot}m^{-2}{\cdot}s^{-1}$. PPF illuminated from LED lamps was affected by forward voltage varied by the surface temperature of LED lamps. Forward voltage of LED lamps was decreased with increasing surface temperature and then PPF was proportionately decreased. Five levels ($14^{\circ}C,\;17^{\circ}C,\;20^{\circ}C,\;23^{\circ}C,\;26^{\circ}C$) of water temperature and three levels ($500\;mL{\cdot}min^{-1}$, $1,000\;mL{\cdot}min^{-1}$, $1,500\;mL{\cdot}min^{-1}$) of flow rate were provided to analyze the change of surface temperature and heat exchange of LED lamps. Heat exchange was increased with decreasing water temperature and increasing flow rate. At flow rate of $1,000-1,500\;mL{\cdot}min^{-1}$ and water temperature of 22.0-$22.6^{\circ}C$, surface temperature of LED lamps can be approached to $24^{\circ}C$ that was almost same as air temperature in CPPS. The calorific value generated from LED lamps used in the study was estimated to be $103.0\;kJ{\cdot}h^{-1}$.

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References

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