温室透光覆盖材料透光特性的测试

Test and measurement of solar visible radiation transmittance of greenhouse glazing

透光特性是温室透光覆盖材料的一个重要指标,其数值的表达却因测试方法的不同而有所差异。该文介绍了透光覆盖材料太阳辐射透过率的测试及计算方法,选用聚乙烯塑料膜(PE)、浮法玻璃、聚碳酸酯双层中空板(PC)三种典型的覆盖材料进行了测试,计算了国际照明委员会(CIE)规定的标准C、标准A和标准D65三种光源下,在可见光与PAR波段范围内,基于4种权重系数下的覆盖材料透光率和光合有效辐射(PAR)透过率。结果表明,PE薄膜几乎不受影响,浮法玻璃相差2%左右,聚碳酸酯双层中空板差异达2%～3.7%。

Solar visible transmittance is crucial for greenhouse glazing. Different test methods for solar visible transmittance of glazing induce different results. The present paper described test and calculating methods for solar transmittance of glazing. Three typical glazing materials, namely, polyethylene（PE） film, float glass and double polycarbonate（PC） sheet, were measured and calculated under different International Commission on Illumination（CIE） standard sources（A, C and D65）, within the visible and photosynthetic active radiation（PAR） spectra, using four response coefficients to solar radiation. Results show that PE film is not affected and float glass differs 2%, the difference of double polycarbonate sheets is up to 2%-3.7%.