@article{scholars9295,
          volume = {113},
            note = {cited By 42},
             doi = {10.1016/j.renene.2016.12.099},
           title = {Thermal performance study of a multi-pass solar air heating collector system for drying of Roselle (Hibiscus sabdariffa)},
            year = {2017},
         journal = {Renewable Energy},
       publisher = {Elsevier Ltd},
           pages = {281--292},
        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},
             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},
        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{\^A}o 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{\^a}??2, 32.24 {\^A}oC, and 0.81 ms{\^a}??1, respectively. An average drying rate of 33.57 g (kg m2 h){\^a}??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. {\^A}{\copyright} 2016},
            issn = {09601481},
          author = {Kareem, M. W. and Habib, K. and Ruslan, M. H. and Saha, B. B.}
}