摘要
大功率LED的散热问题影响着LED的发光效率和电能消耗。该研究设计了水冷式植物工厂LED面光源及散热系统,通过水循环将LED面光源产生的热量及时置换,从而降低LED结温、延缓其光衰,同时将置换的热量根据植物工厂需热特点配置,降低控温能耗。该系统主要包括LED面光源、散热器和水循环系统三部分。水循环系统水路分为两路,在采暖季节将热量置换于植物工厂内部用于室内增温,而在非采暖季节将热量置换于室外,通过风冷散热后再进入水循环系统。性能测试试验表明:水冷式散热装置具有降低LED面光源散热器温度的作用,较无水冷散热装置的散热器温度最少低5.3℃,最高低19.3℃,不仅直接降低了散热器温度,还间接降低了LED结温,从而延长了LED面光源的使用寿命。
The luminous efficiency and energy consumption of LED（light emitting diode） are affected by heat dissipation of high power LED. In the study, LED surface light source used in plant factory with water-cooled cooling system was designed, and the purpose was to take away the heat generated by the LED using water cycle, to reduce the junction temperature and delay light attenuation of the LED, to distribute the heat according to requirement for heat of plant factory, and thus to reduce energy consumption for controlling temperature. The system was mainly made of LED surface light source, radiator and water circulation system. LED surface light source was made of the high-power LED, with 28 identical array units which were arrayed in 4 rows and 7 columns, and each array unit consisted of 44 LEDs. LED surface light source could give out red, blue, white, green and yellow light or any combination light made by above-mentioned light. Supplying voltage of light source was 220 V, and power of LED was provided by the conversion from 220 V AC（alternating current） signal to 0-48 V DC（direct current） signal. Electrical energy of the light with different colors was respectively supplied by independent power. Dimmer was used to adjust output DC voltage of the power, to regulate current of the LED and realize the aim of adjusting light intensity. Light intensity of LED surface light source could be adjusted in the range of 0-2000 μmol/（m2·s）. The radiator of LED surface light source（length×width×height, 500 mm×400 mm×20 mm） was made of hot galvanized Q235 steel, which was composed of bottom plate, hanging lug, cover plate, etc. Water path of bottom plate was S type. The function of water circulation system was to transfer the heat produced by LED surface light source to water. After giving out heat, water was recycled into the radiator to maintain the temperature of the radiator at a low level. The water circulation system mainly consisted of supplying water tank, constant-flow pump, recycling water tank
出处
《农业工程学报》
EI
CAS
CSCD
北大核心
2015年第17期244-247,共4页
Transactions of the Chinese Society of Agricultural Engineering
基金
国家高技术研究发展计划(863计划)(2013AA103003)
农业部公益行业(农业)科研专项(201303108)
关键词
发光二极管
光源
散热系统
水冷系统
LED面光源
植物工厂
light emitting diodes（LED）
light sources
cooling systems
water cooling systems
LED surface light source
plant factory
