Binion W R, Friend T H, Holub G A
Department of Animal Science, Texas A&M University, 2471 TAMU, College Station, TX, 77843, USA.
Int J Biometeorol. 2014 Nov;58(9):1819-23. doi: 10.1007/s00484-013-0783-3. Epub 2014 Jan 12.
This study determined the efficacy of a radiant barrier material used in the construction industry to moderate summer temperatures in polyethylene calf hutches. The cover consisted of a single layer of two-sided reflective aluminized polyester film with a center polyester scrim reinforcement (reflectivity = 95%). At each of two dairies, six hutches containing a young calf were either uncovered (control) or had reflective covers across the top and sides of the hutch, leaving the front, back, and 1.2 × 1.8-m attached outdoor wire pen exposed. Duplicate loggers mounted 20 cm above the flooring in the center of each hutch recorded interior temperature at 30-min intervals over 22 days during late August to early September. The mean daily interior peak temperatures in each of the hutches over 21 days of observation were significantly less (P < 0.001) in the hutches with reflective covers (37.48 ± 0.14 °C) than in the uncovered hutches (41.65 ± 0.45 °C) and did not differ (P = 0.77) between dairies. The mean daily interior peak temperatures in each of the hutches over the warmest 10 days of observation were significantly less (P < 0.001) in hutches with reflective covers (40.15 °C ± 0.16) than in the uncovered hutches (44.93 ± 0.47 °C). The mean interior ceiling temperatures in each of the hutches over 4 days of observation were significantly lower (P < 0.001) in the hutches with reflective covers (37.82 ± 0.36 °C) than in the uncovered hutches (46.89 ± 0.47 °C). The reflective cover used in this study moderated interior hutch temperatures but showed signs of delamination after 22 days and was relatively expensive, so more suitable material needs to be identified.
本研究确定了建筑行业中使用的一种辐射屏障材料在调节聚乙烯犊牛舍夏季温度方面的功效。该覆盖物由单层双面反射镀铝聚酯薄膜组成，中间有聚酯稀松布加强层（反射率 = 95%）。在两个奶牛场中，每个奶牛场有六个装有幼犊的牛舍，其中一部分牛舍无覆盖物（对照），另一部分牛舍在顶部和侧面装有反射性覆盖物，前部、后部以及1.2×1.8米的附属室外铁丝围栏暴露在外。在每个牛舍中心地面上方20厘米处安装的两个重复记录仪，在8月下旬至9月初的22天内每隔30分钟记录一次室内温度。在21天的观察期内，有反射性覆盖物的牛舍（37.48±0.14℃）的每日室内最高平均温度显著低于无覆盖物的牛舍（41.65±0.45℃）（P<0.001），且两个奶牛场之间无差异（P = 0.77）。在观察期内最温暖的10天里，有反射性覆盖物的牛舍（40.15℃±0.16）的每日室内最高平均温度显著低于无覆盖物的牛舍（44.93±0.47℃）（P<0.001）。在4天的观察期内，有反射性覆盖物的牛舍（37.82±0.36℃）的室内天花板平均温度显著低于无覆盖物的牛舍（46.89±0.47℃）（P<0.001）。本研究中使用的反射性覆盖物可调节牛舍内部温度，但在22天后出现分层迹象且成本相对较高，因此需要确定更合适的材料。
