PBS SOLAR CONTROL COATINGS - SAFETY, COST AND OPTIMIZATION

被引:110
作者
NAIR, PK
NAIR, MTS
机构
[1] Photovoltaic Systems Group, Laboratorio de Energia Solar, IIM, Universidad Nacional Autonoma de Mexico, Morelos
关键词
D O I
10.1088/0022-3727/23/2/004
中图分类号
O59 [应用物理学];
学科分类号
摘要
Assessments of safety and cost and the optimisation of chemically deposited PbS thin films for solar control applications are presented. The maximum integrated infrared reflectance, 44%, is obtained at a PbS thin film thickness of approximately=95 nm. The corresponding value of the solar control parameters (AM2 case) are: integrated infrared transmittance, 45%; integrated visible transmittance, 17% (yellowish appearance); integrated visible reflectance, 21% (purple appearance); and integrated solar absorptance, 36%. The total solar radiation and heat transfer into the building through a glazing with such a PbS coating is less than 44%, as compared with the approximately=84% of 3 mm thick clear glass, giving a shading coefficient of approximately=50%. A film thickness of 95 nm is obtainable with a deposition time of 50 min from a bath (at 24 degrees C) containing Pb2+ions and thiourea in the 1:3 molar ratio. However, molar ratios up to 1:5 may be employed, thereby enabling the reduction of deposition time to 35 min. Analyses of the safety and the cost of these coatings have shown excellent promise for their application as medium-efficiency low-cost solar control coatings appropriate for small-scale industrial and ‘do-it-yourself' production of the coatings. © 1990 IOP Publication Ltd.
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页码:150 / 155
页数:6
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