The optimization of the variable louver angle (Δθ) and initial louver angle (θi) for a louvered-fin heat exchanger was determined numerically using the conjugate gradient method. The area reduction ratio relative to a plain surface was the objective function to be maximized. A search for the optimal variable louver angle (Δθ) and initial louver angle (θi), in the ranges of +0°< Δθ < +4°and 18°< θi < 30°, respectively, was performed. The results show that the maximum area reduction ratios are 48.5%-55.2% for the optimal design of (Δθ, θi) at ReH = 133-1199 (Uin = 1.0-9.0 m/s). In order to validate the reliability of the numerical simulation procedure, a comparison of experimental and numerical simulation results was made with the scaled-up testing. This article shows the temperature for the scaled-up louvered fin as determined from infrared thermovision and numerical simulation, respectively. A comparison of images shows that both methods give similar temperature distributions across the entire louvered fin. In addition, it shows comparisons of j and f between the simulation and experimental results. The results show good agreements, with a maximum discrepancy of 12%.
|Number of pages||13|
|Journal||Applied Thermal Engineering|
|Publication status||Published - 2015 Dec 5|
All Science Journal Classification (ASJC) codes
- Energy Engineering and Power Technology
- Industrial and Manufacturing Engineering