LONG-TERM WEATHERING EFFECTS ON THE THERMAL PERFORMANCE OF THE SOLARGENICS (LIQUID) SOLAR COLLECTOR AT OUTDOOR CONDITIONS

摘要

Visual inspection of the collector, prior to rétest, in¬dicated that some rain water leakage had occurred at the cover seals leaving water marks on the absorber plate. No other material deficiencies were apparent. The test results indicated that a small change in performance had occurred. A slight increase in the negative slope indi¬cates an increase in the heat loss parameters. The slightly lower intercept on the ordinate axis is likely a result of a slight decrease in the absorptivity of the absorber plate or a decrease in the transmissivity of the cover glass.