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Comparative study of air and argon gases between cover and absorber coil in a cylindrical solar water heater: An experimental study

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  • Sadeghi, Gholamabbas
  • Safarzadeh, Habibollah
  • Bahiraei, Mehdi
  • Ameri, Mehran
  • Raziani, Mohsen

Abstract

In this study, the effect of various gases filling the space between the cover and the absorber coil on the thermal performance of a cylindrical solar water heater (CSWH) is experimentally investigated. Since the Prandtl number for argon gas is less than that for the air, the thermal performance of the CSWH increases. The experiments are conducted for mass flow rates of 2.5, 3, 3.5 and 4 kg/h. The results show that an increase in the flow rate leads to a decrease in the temperature difference the of water between the inlet and outlet of the coil due to reduction of the residence time of the fluid. The energy efficiency of the collector reaches its maximum at the mass flow rate until 3.5 kg/h, and then reduces at higher values of mass flow rate because the water temperature difference decreases dramatically. Hence, the optimum mass flow rate for a cylindrical collector is reported as 3.5 kg/h. The maximum energy efficiencies for argon and air are 52.14% and 48.17%, respectively. Finally, the constructed cylindrical solar water heater is also economically compared to a flat plate collector (FPC) and an electric water heater with similar thermal efficiency.

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  • Sadeghi, Gholamabbas & Safarzadeh, Habibollah & Bahiraei, Mehdi & Ameri, Mehran & Raziani, Mohsen, 2019. "Comparative study of air and argon gases between cover and absorber coil in a cylindrical solar water heater: An experimental study," Renewable Energy, Elsevier, vol. 135(C), pages 426-436.
    • Handle: RePEc:eee:renene:v:135:y:2019:i:c:p:426-436
    DOI: 10.1016/j.renene.2018.12.030
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    1. Ahmadlouydarab, Majid & Anari, Tahereh Dana & Akbarzadeh, Alireza, 2022. "Experimental study on cylindrical and flat plate solar collectors’ thermal efficiency comparison," Renewable Energy, Elsevier, vol. 190(C), pages 848-864.
    2. Sadeghi, Gholamabbas & Najafzadeh, Mohammad & Ameri, Mehran, 2020. "Thermal characteristics of evacuated tube solar collectors with coil inside: An experimental study and evolutionary algorithms," Renewable Energy, Elsevier, vol. 151(C), pages 575-588.
    3. Sadeghi, Gholamabbas & Pisello, Anna Laura & Safarzadeh, Habibollah & Poorhossein, Miad & Jowzi, Mohammad, 2020. "On the effect of storage tank type on the performance of evacuated tube solar collectors: Solar radiation prediction analysis and case study," Energy, Elsevier, vol. 198(C).
    4. Yari, Shahram & Safarzadeh, Habibollah & Bahiraei, Mehdi, 2021. "Experimental study of an absorber coil in spherical solar collector with practical dimensions at different flow rates," Renewable Energy, Elsevier, vol. 180(C), pages 1248-1259.

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