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本文叙述了为在我国保护地蔬菜生产中应用地下热交换系统而进行的在塑料大棚内用该系统贮能加温的试验研究。试验结果表明,地下热交换系统能有效地贮存太阳能并用于夜间加温,因而能使塑料大棚在不用燃料的情况下在夜间维持10℃左右的棚内外温差,同时也使棚内地温得到相应提高。采用地下热交换系统的塑料大棚,在春季能比普通大棚提早20—30天达到适于喜温蔬菜定植的小气候条件,若再进一步改进与完善,可望将喜温蔬菜的春季定植期比普通大棚至少提前一个月左右。同样,在秋季利用地下热交换系统也能使喜温蔬菜的生长期得到相应的后延。
This paper describes the experimental study on the application of underground heat exchange system for vegetable production in protected areas in China. The experimental results show that the underground heat exchange system can effectively store solar energy and use it for heating at night, so that the plastic greenhouse can maintain a temperature difference of about 10 ℃ in the night without fuel and also increase the ground temperature in the greenhouse at the same time . The plastic greenhouse with underground heat exchange system can reach 20-30 days earlier than ordinary greenhouses in the spring to achieve the microclimate conditions suitable for the planting of hi-temperature vegetables. If further improvement and perfection, the spring planting of hi-temperature vegetables is expected to be more common than the normal Greenhouses at least a month in advance. Similarly, the use of underground heat exchange systems in the fall can also delay the growth of the thermophilic vegetables.