Experimental analysis of solar air heater duct with discrete arc-pattern combined staggered element roughness on absorber plate

Sanjeev Kumar Yadav () and Atul Lanjewar
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Sanjeev Kumar Yadav: Maulana Azad National Institute of Technology
Atul Lanjewar: Maulana Azad National Institute of Technology

Environment, Development and Sustainability: A Multidisciplinary Approach to the Theory and Practice of Sustainable Development, 2023, vol. 25, issue 8, No 51, 8675 pages

Abstract: Abstract Providing artificial roughness over absorber surface of solar air heater (SAH) is the most economical and effective way of enhancing its performance. This paper portrays roughness analysis of absorber surface in SAH having discrete arc rib combined with staggered element. The experimental study is carried out with four hot rolled steel plates of 1.2 mm thickness and surface area 1500 mm × 200 mm (L × W) that encompassed roughness parameters comparative roughness pitch (p/e = 10), comparative roughness height (e/Dh = 0.04545), number of gaps (Ng = 2), comparative gap width (g/e = 1), comparative staggered pitch (p′/p = as 0.4) and comparative staggered length (r/e = 1.5, 2.5, 3.5, 4.5) and Reynolds number (Re = 3000–15,000). The highest Nusselt number (Nu) and friction coefficient (f) recorded are 2.74 and 4.93 times compared to smooth plate at r/e = 3.5 and r/e = 4.5, respectively. Highest thermohydraulic performance (THP) recorded is 1.86 at r/e = 3.5 at Re = 12,000. Correlations for roughness function (R) and heat transfer function (G) are developed. The result obtained from mathematical model developed for performance prediction of roughened solar air heater fall within ± 10% for R and ± 6% for G. The SAH performance with respect to effective efficiency is also been considered. The highest values of thermal efficiency and effective efficiency obtained are 59.47% and 57.60%, respectively.

Keywords: Discrete arc; Staggered rib; Effective efficiency; Thermohydraulic performance; Solar air heater (search for similar items in EconPapers)
Date: 2023
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DOI: 10.1007/s10668-022-02417-0

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