Abstract
The significant challenge in vacuum tube solar air collector is worse performance after sunset which prompts the thermal energy storage. In present manuscript, the used engine oil based thermal energy storage coupled with novel evacuated tube solar air collector (NETAC) is developed. The NETAC investigation is evaluated during winter season for hot air production for 13 h at diverse air flow rates and different directions of air flow (parallel air flow & counter air flow). The maximal temperature difference (24.8 oC) of air is obtained at low air flow rate (79.5 Kg/h) and maximal mean efficiency (28.8%) of NETAC at high air flow rate (159 Kg/h) with circular fin and counter flow arrangement. The maximal mean energy efficiency (27.15%) and exergy efficiency (24.8%) of the oil thermal storage tank is attained at high air flow rate (159 Kg/h) with circular fin and parallel flow arrangement. The maximal mean energy gain (538.7 W) by air is obtained at high air flow rate (159 Kg/h) with circular fin and parallel flow arrangement.
Published Version
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