Numerical and experimental investigation of a solar absorber extension tube with turbulators for upgrading the performance of a solar dryer

Abstract

Purpose During the past several years, research and studies in the field of solar energy have been continuously increased. One of the substantial applications of solar energy is related to industrial utilization for the drying process by efficient heat transfer methods. This study aims to upgrade the overall performance of an indirect solar dryer using a solar absorber extension tube (SET) equipped with ball-type turbulators. Design/methodology/approach In this work, three various SETs including hollow (SET Type 1), 6-balls (SET Type 2) and 10-balls (SET Type 3), have been simulated using Fluent software to evaluate heat transfer characteristics and flow structure along the air passage. Then, the modified solar drying system has been manufactured and tested at different configurations. Findings The findings indicated that adding a SET improved the performance notably. According to the results, using turbulators in the tube has a positive effect on heat transfer. The highest overall thermal efficiency was found in the range of 51.47%–64.71% for the system with SET Type 3. The maximum efficiency increment of the system was found as 19% with the use of SET. Also, the average specific moisture extraction rate, which is a significant factor to survey the effectiveness of the dehumidification system was found between 0.20 and 0.38 kg kWh−1. Originality/value In the present study, a novel SET has been developed to upgrade the performance of the solar dehumidifier. This new approach makes it possible to improve both thermal and drying performances.

A comprehensive review of solar cooking systems

“…Solar energy has emerged as a critical field of research and innovation, with a multitude of studies and developments in recent years that are shaping the landscape of solar technology (Afshari, Mandev, et al, 2023; Bakirci, 2021; Bakirci & Yuksel, 2021) which highlight the diverse range of advancements in the field. The importance of solar energy as a versatile and sustainable power source is exemplified by a wide range of studies conducted in recent years (Afshari, Muratçobanoğlu, et al, 2023; Khanlari et al, 2022, 2023; Tuncer et al, 2023). Furthermore, presented studies in the field emphasizes the potential of solar energy in providing clean and accessible energy for daily energy needs.…”

“…advancements in the field. The importance of solar energy as a versatile and sustainable power source is exemplified by a wide range of studies conducted in recent years Khanlari et al, 2022Khanlari et al, , 2023Tuncer et al, 2023). Furthermore, presented studies in the field emphasizes the potential of solar energy in providing clean and accessible energy for daily energy needs.…”