Reduction in Electric-Energy Consumption for Cooling in a Plant Factory with Artificial Light
文献类型： 外文期刊
第一作者： Wang, J.
作者： Wang, J.;Yang, Q.;Tong, Y.;Wei, L.
作者机构：
关键词： energy-saving;outdoor air temperature;air conditioner;COP;electric-energy use efficiency
期刊名称：INTERNATIONAL SYMPOSIUM ON NEW TECHNOLOGIES FOR ENVIRONMENT CONTROL, ENERGY-SAVING AND CROP PRODUCTION IN GREENHOUSE AND PLANT FACTORY - GREENSYS 2013
ISSN： 0567-7572
年卷期： 2014 年 1037 卷
页码：
收录情况： SCI
摘要： The commercial use of plant factories with artificial light (PFAL) is limited by its high initial construction and operation costs. The electric-energy consumed by air conditioner (AC), applied mainly for cooling, accounts for 15-35% of the total electric-energy used in a PFAL. To reduce this electric-energy consumption, an air exchanger (AE) with low electric power was used for cooling by introducing outdoor cold air. In this experiment, the indoor air temperature in two PFALs (floor area: 10.5 m(2) each) was maintained at 25 and 15 degrees C during photoperiod and dark period, respectively. In one PFAL, an AE (air flow rate: 250 m(3) h(-1)) was used along with an AC (cooling capacity: 6.3 kW) to maintain the indoor air temperature at the set-point, the other without AE was the reference. The AE was used when outdoor air temperature was lower than T-f, standing for the highest temperature of outdoor air allowing into PFAL, 22 and 12 degrees C during photoperiod and dark period, respectively. When the indoor air temperature could not be maintained at the set-point by using AE, AC was started. The results show that, when outdoor air temperature ranged from -4 to 12 degrees C, the electric-energy consumption in the PFAL with AE was reduced by 24.6-63.0% and 2.3-33.6% during photoperiod and dark period, respectively, compared with the reference PFAL. A negative correlation existed between the reduction rate and outdoor air temperature in the range of -4 to 12 degrees C. The results indicate that the electric-energy consumption for cooling could be reduced by using AE in combination with AC when outdoor air temperature is relatively low. Thus, during photoperiod and dark period, as long as outdoor air temperature is lower than T-f, using AE in a PFAL will be an effective way to reduce electric-energy consumption for cooling and the operation costs, especially during cold winter.
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