Five Years' Outdoor Exposure of Solar Collectors. Renewed Performance Measurements and Determination of the Effect on Thermal Efficiency

摘要

During 1980/81, the Swedish National Testing Institute (NTI) measured the thermal efficiency and other parameters of virtually all the solar collectors available on the Swedish market at the time. One of the parties for whom the work was carried out was the National Board for Consumer Policies. All told, there were 17 different collectors (both Swedish-manufactured and imported), all water-cooled. After carrying out the tests, the collectors were mounted on the roof of one of the Institute's buildings for outdoor exposure under stagnation conditions, with the intention that they should provide data for assessing the overall life of the products. After about five years' outdoor exposure, an interim assessment has been performed by remeasuring the thermal efficiency of some of the collectors, coupled with visual inspection to detect any changes. (Copyright (c) Swedish Council for Building Research 1988.)