eprintid: 9295 rev_number: 2 eprint_status: archive userid: 1 dir: disk0/00/00/92/95 datestamp: 2023-11-09 16:21:16 lastmod: 2023-11-09 16:21:16 status_changed: 2023-11-09 16:14:46 type: article metadata_visibility: show creators_name: Kareem, M.W. creators_name: Habib, K. creators_name: Ruslan, M.H. creators_name: Saha, B.B. title: Thermal performance study of a multi-pass solar air heating collector system for drying of Roselle (Hibiscus sabdariffa) ispublished: pub keywords: Drying; Economic analysis; Hemp; Humidity control; Investments; Solar energy; Wind, Medicinal herb; Multi-pass; Payback periods; Performance; Roselle, Collector efficiency, economic analysis; energy efficiency; heating; herb; performance assessment; renewable resource; solar power; thermal power; wind velocity, Hibiscus sabdariffa note: cited By 42 abstract: This article presents a study on the performance of a forced convective multi-pass solar air heating collector (MPSAHC) system assisted with granite as a sensible energy storing matrix. Experimental drying of Roselle was carried out in August 2015 at Solar Energy Research Site of Universiti Teknologi PETRONAS, Malaysia (4.385693° N and 100.979203 S). The present investigation was conducted under the daily average relative humidity, solar irradiance, ambient temperature and wind speed of 64.5, 635.49 Wm�2, 32.24 °C, and 0.81 ms�1, respectively. An average drying rate of 33.57 g (kg m2 h)�1 was achieved while the system optical efficiency, collector efficiency, drying efficiency and moisture pickup efficiency of 70.53, 64.08, 36.22 and 66.95 were obtained, respectively. MPSAHC dryer was 21 h faster with fair color retention when compared to open sun drying approach (OSDA) that was conducted together under the same weather condition. Techno economic analysis reflected a payback period of 2.14 years. However, drying efficiency could be improved if the inlet air humidity can be controlled to favor drying operation. © 2016 date: 2017 publisher: Elsevier Ltd official_url: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85019598968&doi=10.1016%2fj.renene.2016.12.099&partnerID=40&md5=82beef1a3f3a124a273a45755b01d4ce id_number: 10.1016/j.renene.2016.12.099 full_text_status: none publication: Renewable Energy volume: 113 pagerange: 281-292 refereed: TRUE issn: 09601481 citation: Kareem, M.W. and Habib, K. and Ruslan, M.H. and Saha, B.B. (2017) Thermal performance study of a multi-pass solar air heating collector system for drying of Roselle (Hibiscus sabdariffa). Renewable Energy, 113. pp. 281-292. ISSN 09601481