Performance of Introducing Outdoor Cold Air for Cooling a Plant Production System with Artificial Light

文献类型： 外文期刊

第一作者： Wang, Jun

作者： Wang, Jun;Tong, Yuxin;Yang, Qichang;Xin, Min;Wang, Jun;Tong, Yuxin;Yang, Qichang;Xin, Min

作者机构：

关键词： coefficient of performance;energy saving;heat pump;lettuce;plant factory

期刊名称：FRONTIERS IN PLANT SCIENCE （ 影响因子：5.753； 五年影响因子：6.612 ）

ISSN： 1664-462X

年卷期： 2016 年 7 卷

页码：

收录情况： SCI

摘要： The commercial use of a plant production system with artificial light (PPAL) is limited by its high initial construction and operation costs. The electric-energy consumed by heat pumps, applied mainly for cooling, accounts for 15-35% of the total electric-energy used in a PPAL. To reduce the electric-energy consumption, an air exchanger with low capacity (180 W) was used for cooling by introducing outdoor cold air. In this experiment, the indoor air temperature in two PPALs (floor area: 6.2 m(2) each) was maintained at 25 and 20 degrees C during photoperiod and dark period, respectively, for lettuce production. A null CO2 balance enrichment method was used in both PPALs. In one PPAL (PPAL(e)), an air exchanger (air flow rate: 250 m(3).h(-1)) was used along with a heat pump (cooling capacity: 3.2 kW) to maintain the indoor air temperature at the set-point. The other PPAL (PPAL(c)) with only a heat pump (cooling capacity: 3.2 kW) was used for reference. Effects of introducing outdoor cold air on energy use efficiency, coefficient of performance (COP), electric-energy consumption for cooling and growth of lettuce were investigated. The results show that: when the air temperature difference between indoor and outdoor ranged from 20.2 to 30.0 degrees C: (1) the average energy use efficiency of the air exchanger was 2.8 and 3.4 times greater than the COP of the heat pumps in the PPAL(e) and PPAL(c), respectively; (2) hourly electric-energy consumption for cooling in the PPAL(e) reduced by 15.8-73.7% compared with that in the PPAL(c); (3) daily supply of CO2 in the PPAL(e) reduced from 0.15 to 0.04 kg compared with that in the PPAL, with the outdoor air temperature ranging from -5.6 to 2.7 degrees C; (4) no significant difference in lettuce growth was observed in both PPALs. The results indicate that using air exchanger to introduce outdoor cold air should be considered as an effective way to reduce electric-energy consumption for cooling with little effects on plant growth in a PPAL.

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