{'fraction_non_alphanumeric': 0.022953328232593728, 'fraction_numerical': 0.028309104820198928, 'mean_word_length': 4.7368421052631575, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
Numerical Investigation of Airflow in a Trapezoidal Solar Air Heater Channel

Trapezoidal solar air heater channel is one of the developments of a solar air heater. It has a purpose to increase the performance of a solar air heater. It has a more effective area to absorb solar heat. This study present analyzes of airflow and heat transfer inside a solar air heater channel using Computational Fluid Dynamic. The Reynolds number range from 10600, 11300, 12000, and 12700. The uniform heat flux on the top and tilt surface value is 800, 900, and 1000 W/m2. The simulation set up for this paper uses the finite volume method, the algorithm is SIMPLE. The Renormalization k-epsilon (RNG) is used as a viscous turbulent model. The governing equations such as continuity equation, momentum equation, energy equation are discretized by the second-order upwind numerical scheme. The solutions are converged when the continuity residual values are 10−4 for all variables and then 10−6 for the energy equation. The result from this study shows the low Reynolds number will increase air temperature outlet for all intensity. The airflow velocity inside the channel develops continuously from inlet to outlet. The airflow near the bottom surface has low velocity. It due to shear stress, airflow with channel surface.