Abstract
Abstract To improve the efficiency of solar thermal collector, solar absorber with selective coating is essential. Solar absorbers with CuO nano structure selective coating were prepared by chemical oxidation with 0.065mol/L K2S2O8 and 2.5mol/L KOH solution at 60℃ for 5min, 15min and 60min, respectively, and then heat treated at 180℃ in air for 2h. Transient calorimetric method was applied to obtain the absorptance (α). And outdoor tests were conducted in summer in Nanjing to obtain emittance (e) of CuO nano structure selective coating and instantaneous efficiency of solar absorber. It shows that the oxidation time has obvious effect on absorptance, emittance of CuO nano structure selective coating and instantaneous efficiency of solar absorber. The absorptance and emittance (α/e) are measured to be approximately 0.88/0.13 (5min), 0.90/0.11 (15min) and 0.88/0.39 (60min). The instantaneous efficiency measured to be 76.8% (5min), 78.3% (15min) and 64.9% (60min). CuO nano structure selective coating showed great potential on application of solar thermal collector.
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