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以不锈钢、HDPE、改良PVC-u材料制成的地中热交换系统为试验材料,与传统的PVC-u(对照)进行对比,研究了4种材料对热交换系统的进口及出口温湿度、不同深度土层温度的影响,以期筛选出一种对温室内环境调节和蓄热性能方面均表现突出的地中热交换系统材料。结果表明:白天不锈钢与改良PVC-u降温性能相近且均优于对照,夜间改良PVC-u保温性能最好;改良PVC-u夜间除湿效果最佳,不锈钢次之;在地下30 cm处,不锈钢组蓄热性能明显优于对照,夜间改良PVC-u组保温性能最佳;在地表20 cm处,晴天,不锈钢组的蓄热性能及改良PVC-u组的保温性能均略优于对照;阴天温度下降阶段,改良PVC-u组的保温性能优势明显;地下10 cm处,4组保温蓄热性能无明显差异。从对温室热环境方面考虑,4组中改良PVC-u性能最佳。
Taking the medium to high heat exchange system made of stainless steel, HDPE and modified PVC-u as test materials, compared with the traditional PVC-u (control), the effects of four kinds of materials on the temperature and humidity of the heat exchange system, Different depths of soil temperature in order to screen out a kind of medium heat exchange system material which has outstanding performance in regulating and storing heat in the greenhouse. The results showed that: during the day, the cooling performance of stainless steel and modified PVC-u were similar and better than the control, the best PVC-u insulation performance was the best at night; the best PVC-u night-time dehumidification effect was the best, followed by stainless steel; The heat storage performance of the group PVC-u was better than that of the control at night. The thermal insulation performance of the PVC-u group was better than the control at sunny 20 days, In the stage of decreasing temperature, the thermal insulation performance of the improved PVC-u group has obvious advantages. There is no significant difference between the thermal insulation and thermal storage properties of the 4 groups under the ground 10 cm. From the perspective of the thermal environment of greenhouses, the best PVC-u performance in the four groups was improved.