中国的日光温室实现了高效的能量利用,在中国北方地区的冬季农业生产中发挥了巨大的作用。但在实践生产中日光温室存在巨大的能量不平衡,给北方冬季的农业生产造成很大的损失,同时也限制了日光温室的高效应用。为了实现了日光温室对太阳能的高效利用,该文提出了一种能够将白天富裕能量进行有效存储的主动蓄热后墙日光温室。该文对主动蓄热后墙日光温室的室内温度和通风蓄热风道蓄热特性进行理论分析和试验,并与传统9 m跨的被动蓄热日光温室进行了对比分析。试验结果表明,主动蓄热后墙日光温室的温度指标有了较明显提高。在晴天和多云采光天气条件下,主动蓄热后墙日光温室室内的温度较9 m跨被动蓄热日光温室均有较大幅度的增加,在晴天夜间保温时段(16:00~次日09:00),主动蓄热后墙日光温室温度提高最小为1.8℃,最大为2.8℃,平均提高2.2℃;在多云天夜间保温时段(16:00~次日09:00),主动蓄热后墙日光温室温度提高最小为1.6℃,最大为4.2℃,平均提高2.2℃。该文利用CFD数值模拟对温室蓄热后墙的20℃等值面进行了分析,分析结果表明在定常条件下,通风主动蓄热的高效范围在10 m以内,有效长度在20 m以内。通过该试验,结合温室建筑的实践构造要求,确定的蓄热风道合理长度为20 m。
Efficient utilization of solar energy is one of the important topics of structural optimization design of solar-greenhouse. And it is significant to the applied researches in this field and particularly to greenhouse energy conservation. Chinese solar greenhouse achieved high efficiency of energy expenditure in the practice. Solar greenhouse played a huge role in the agriculture production particularly in winter in northern China. However, solar greenhouse basically has two major problems. One problem is energy imbalance in the indoor greenhouse between daytime and nighttime. Solar greenhouse has to be ventilated due to the high indoor temperature in the daytime. And it has to be heated at night to protect vegetable from frost damage. According to statistical analysis, the losses to agricultural production brought by freezing injury are almost the sum losses by other stress. At the same time it also limits the efficient utilization of solar greenhouse. This paper introduces new types of solar-greenhouses. The innovation structure is the active energy-storage solar-greenhouse which can active storage heat during the daytime. Theoretical analysis was carried out on the indoor temperature and the regenerative properties of soil-air heat transfer of the active energy-storage solar-greenhouse in this paper. Comparing with the 9m-span normal solar-greenhouse with fixed back-wall, the active energy-storage solar-greenhouse has higher indoor temperature and temperature indicators have improved greatly. Under such experiment condition the active energy-storage solar-greenhouse is more efficient in utilization of solar energy and raising temperature. The indoor temperature in the greenhouse with active thermal storage technology has a great enhancement comparing with the normal type at clear and cloudy day. The mean indoor temperature increased by 1.8 to 2.8℃ in the active thermal-storage back wall solar-greenhouse within Nocturnal period (16:00-09:00) on Jan 15, 2014 (clear day). The average mean indoor temp