Extreme learning machine: a new alternative for measuring heat collection rate and heat loss …

Solar water heaters (SWHs) are powerful and popular techniques to make use of solar energy, which typically use solar collectors and concentrators to gather, store, and use solar radiation to heat air or water in domestic, commercial, or industrial plants (Mekhile et al. 2011). As one of the most important types of stationary collector, evacuated tube solar collectors have substantially lower heat loss coefficient and cost than standard flat plate collectors (Kalogirou 2003; Morrison et al. 1984). In Chinese area, all-glass evacuated tubular solar water heaters are widely used due to their excellent thermal performance, convenient installation, and easy transportability (Shah and Furbo 2007; Liu et al. 2013). In recent years, there are many research groups that focus on the theoretical and experimental studies of the thermal performance of water-in-glass…


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