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High thermal performance of the solar air heater designs triggered by improved jet stability

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  • Chaurasiya, Shailendra Kumar
  • Singh, Satyender

Abstract

In this experimental work, the thermal and thermohydraulic performance of two novel designs of solar air heater employing confined submerged circular air jet arrays is investigated. Design-I consists of a wavy transparent acrylic sheet for air jet impingement from the top side of the absorber plate, while Design-II consists of a wavy metallic impinging plate for air jet impingement from the bottom side of the absorber plate. Both solar air heaters are designed to induce stable air jets for the range of mass flow rates ranging from 0.01 kg/s to 0.04 kg/s. Obtained results presented the superiority of Design-I in terms of heat transfer augmentation to air and compactness in size compared to Design-II. The thermal and thermohydraulic efficiency of Design-I corresponding to the mass flow rate of 0.04 kg/s is obtained as 89.72% and 89.16%, which is found to be 24.33% and 24.52% high compared to Design-II, respectively. In addition, the recommended value of the mass flow rate is obtained as 0.03 kg/s on the basis of thermohydraulic efficiency and operating cost, that presents an operating cost of 0.109 INR/kWh for Design-I. This work is extended for the numerical investigation to reveal the associated physics of fluid and heat transfer in solar air heater designs. In numerical investigation, 3D structured O-grid mesh is generated and RNG k-ε turbulence model is employed using the commercial CFD tool.

Suggested Citation

  • Chaurasiya, Shailendra Kumar & Singh, Satyender, 2023. "High thermal performance of the solar air heater designs triggered by improved jet stability," Renewable Energy, Elsevier, vol. 204(C), pages 532-545.
    • Handle: RePEc:eee:renene:v:204:y:2023:i:c:p:532-545
    DOI: 10.1016/j.renene.2023.01.031
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    References listed on IDEAS

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    1. Paul, B. & Saini, J.S., 2004. "Optimization of bed parameters for packed bed solar energy collection system," Renewable Energy, Elsevier, vol. 29(11), pages 1863-1876.
    2. Singh, Satyender & Chaurasiya, Shailendra Kumar & Negi, Bharat Singh & Chander, Subhash & Nemś, Magdalena & Negi, Sushant, 2020. "Utilizing circular jet impingement to enhance thermal performance of solar air heater," Renewable Energy, Elsevier, vol. 154(C), pages 1327-1345.
    3. Zukowski, M., 2015. "Experimental investigations of thermal and flow characteristics of a novel microjet air solar heater," Applied Energy, Elsevier, vol. 142(C), pages 10-20.
    4. Chauhan, Ranchan & Thakur, N.S., 2014. "Investigation of the thermohydraulic performance of impinging jet solar air heater," Energy, Elsevier, vol. 68(C), pages 255-261.
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