Design and comparative evaluation of a three-layer coffee dryer

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dc.contributor.advisorGautz, Loren
dc.contributor.authorCorrea-Piedrahita, Arturo
dc.contributor.departmentBiosystems Engineering
dc.date.accessioned2009-03-06T19:34:40Z
dc.date.available2009-03-06T19:34:40Z
dc.date.graduated2003-08
dc.date.issued2003-08
dc.descriptionxxi, 202 leaves
dc.description.abstractDrying is an important processing step that prevents coffee from being attacked by bacteria and fungus that deteriorate quality. After coffee has been dried correctly, that is, dried to at least of 12 % wet basis moisture content; it can be stored safely with minimum risk of spoilage and quality deterioration. This study evaluated the drying performance of coffee beans dried in a newly developed three-layer coffee dryer, against rotary driers and traditional sun-drying. All the dryers were evaluated by measuring the uniformity of final moisture content and mechanical performance. The conclusion of this study is that, compared to sun-drying and mechanical rotary dryers, the new three-layer coffee drier yields virtually identical uniformity in final moisture content, yet it is achieved through a lower cost. This study also concluded that fuel oil is the most economical fuel to be used in the operation of mechanical dryers. Also, this study concludes that the sun-drying technique is the most expensive system to dry coffee in Kona for two reasons: (1) sun-drying coffee is inherently a manual-labor intensive process; and (2) the cost of manual labor in Kona is high. Lastly, this study's focus on sun dryers also shows that higher uniformity of final moisture can be attained by the incorporation of a three-times-per-day "Cenicafe" raking technique.
dc.identifier.urihttp://hdl.handle.net/10125/6994
dc.publisherUniversity of Hawaii at Manoa
dc.relationTheses for the degree of Master of Science (University of Hawaii at Manoa). Biosystems Engineering; no. 3791
dc.rightsAll UHM dissertations and theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission from the copyright owner.
dc.rights.urihttps://scholarspace.manoa.hawaii.edu/handle/10125/1943
dc.titleDesign and comparative evaluation of a three-layer coffee dryer
dc.typeThesis
dc.type.dcmiText
local.identifier.callnumberQ111 .H3 no. 3791
local.thesis.degreelevelMS

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M.S. - Biosystems Engineering