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北方日光节能温室设计中把墙体保温、覆盖保温、前屋面阻热板保温都考虑得较成熟,但地面传导散热因施工和肥水管理等问题往往被忽视。土壤传导失热是温室热量散失的重要途径,其包括土壤上下层之间纵向的热传导。土壤中纵向的热传导仅发生在25cm左右的土壤中,当深度达40~50cm时,土壤温度变化很小。河北省唐山市丰南区地处沿海,盐碱地较多,地下水位较浅,日光
In the design of solar energy conservancy greenhouse in North China, the wall insulation, covering insulation, thermal insulation of the front roof are considered more mature, but the problem of ground-conduction heat dissipation due to construction and fertilizer and water management are often overlooked. Soil conduction loss of heat is an important way to dissipate heat in the greenhouse, which includes the longitudinal thermal conduction between the upper and lower soil layers. Longitudinal heat conduction in the soil takes place only in the soil about 25cm, and when the depth reaches 40 ~ 50cm, the soil temperature changes little. Fengnan District, Tangshan City, Hebei Province is located in the coast, more saline land, shallow groundwater, sunlight