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本文通过严格一致的对比观测条件,研究和分析了地-气热交换系统的热性能及其对塑料大棚中气候环境、作物生长和产量的影响;在理论分析和实际观测的基础上计算了塑料大棚中热量平衡;从经济效益和节约能源的角度对该设施的可行性和实用性作了客观的评价。 实验结果表明:地-气热交换系统可使塑料大棚在夜间升温2.0—4.4℃,在白天降温2.5—6.5℃;使作物的开花期和收获期提前大约10天,而使晚秋作物(黄瓜)延后生长约15天;草莓和黄瓜的产量分别增加了51％和45％;地-气热交换塑料大棚与对照塑料大棚的热量收支有明显的不同,在夜间对照大棚热量损失较大;从经济效益和节能效果看,该设施在华北地区和黄淮流域具有一定的可行性和实用性。
In this paper, through rigorous and consistent comparative observation conditions, the thermal performance of the ground-to-air heat exchange system and its effect on climate environment, crop growth and yield in plastic greenhouse were studied and analyzed. Based on the theoretical analysis and actual observations, Greenhouse heat balance; from the perspective of economic efficiency and energy conservation of the facility’s feasibility and practicality made an objective assessment. The experimental results show that the ground-air heat exchange system can make the plastic greenhouse warm 2.0-4.4 ℃ in the night and cool 2.5-6.5 ℃ in the daytime, and make the flowering and harvesting of the crops advance about 10 days, Delayed growth for about 15 days; strawberry and cucumber production increased by 51% and 45% respectively; heat exchange between plastic greenhouse and ground heat exchange control plastic greenhouse has a significant difference in calories, heat loss in the control greenhouse at night; From the perspective of economic benefits and energy saving, this facility has some feasibility and practicability in North China and Huang-Huai basin.