Show simple item record
dc.description.sponsorshipGefördert durch den Publikationsfonds der Universität Kasselger
dc.rightsNamensnennung 4.0 International*
dc.subjectrenewable energyeng
dc.subjectScheffler concentrator reflectoreng
dc.subjectbatch-type solar roastereng
dc.subjectresponse surface methodologyeng
dc.subjectcoffee roastingeng
dc.titleDevelopment and Experiments on a Batch-Type Solar Roaster—An Innovative Decentralized System for Coffee Roastingeng
dcterms.abstractAbout 70% of the harvested coffee is exported to the industrialized nations for value addition due to lack of processing and logistic facilities in developing coffee producer countries, thus leaving behind a marginal economic return for the growers. This research was conducted to investigate the roasting capacity of an innovatively developed batch-type directly solar radiated roasting system for the decentralized processing of coffee using solar energy. Central composite rotatable design (CCRD) was employed to design the experiments to optimize the coffee roasting process. Experimental results revealed that with an average solar direct normal irradiance (DNI) of 800 W/m2, the roaster was capable of roasting a batch of 2 kg coffee beans in 20, 23, and 25 min subjected to light roasts, medium roasts, and dark roasts, respectively at a drum speed of two revolutions per minute (rpm). The batch-type solar roaster has the capacity to roast 28.8–36 kg of coffee beans depending on dark to light roasting conditions on a clear sunny day with DNI ranging from 650 to 850 W/m2. The system thermal efficiency during coffee roasting was determined to be 62.2%, whereas the roasting efficiency at a corresponding light roast, medium roast, and dark roast was found to be 97.5%, 95.2%, and 91.3%, respectively. The payback period of the solar roaster unit was estimated to be 1038 working sunshine hours, making it viable for commercialization.eng
dcterms.accessRightsopen access
dcterms.creatorMajeed, Faizan
dcterms.creatorRaza, Ali
dcterms.creatorMunir, Anjum
dcterms.creatorHensel, Oliver
dc.subject.swdErneuerbare Energienger
dc.subject.swdKonzentrator <Solartechnik>ger
dc.subject.swdReflektor <Lichttechnik>ger
dcterms.source.issueIssue 4
dcterms.source.volumeVolume 14

Files in this item


This item appears in the following Collection(s)

Show simple item record

Namensnennung 4.0 International
Except where otherwise noted, this item's license is described as Namensnennung 4.0 International