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Impact of Process Parameters and Bulk Properties on Quality of Dried Hops

Raut, S.; von Gersdorff, G.J.E.; Münsterer, J.; Kammhuber, K.; Hensel, O. and Sturm, B. (2020) Impact of Process Parameters and Bulk Properties on Quality of Dried Hops. Processes, 11 (8), pp. 1-23.

[thumbnail of processes-08-01507-v3.pdf] PDF - Published Version - English

Document available online at: https://www.mdpi.com/2227-9717/8/11/1507/htm


Hops are critical to the brewing industry. In commercial hop drying, a large bulk of hops is dried in multistage kilns for several hours. This affects the drying behavior and alters the amount and chemical composition of the hop oils. To understand these changes, hops of the var. Hallertauer Tradition were dried in bulks of 15, 25 and 35 kg/m² at 60 °C and 0.35 m/s. Additionally, bulks of 25 kg/m² were also dried at 65 °C and 0.45 m/s to assess the effect of change in temperature and velocity, respectively. The results obtained show that bulk weights significantly influence the drying behavior. Classification based on the cone size reveals 45.4% medium cones, 41.2% small cones and 8.6% large cones. The highest ΔE value of 6.3 and specific energy consumption (113,476 kJ/kgH2O) were observed for the 15 kg/m² bulk. Increasing the temperature from 60 °C to 65 °C increased the oil yield losses by about 7% and myrcene losses by 22%. The results obtained show that it is important to define and consider optimum bulk and process parameters, to optimize the hop drying process to improve the process efficiency as well the product quality.

EPrint Type:Journal paper
Keywords:bulk weight, hop cones size distribution, chemical analysis, energy consumption, BÖLN, BOELN, BOEL, BÖL, FKZ 17OE005, SUSORGANICPLUS, Core Organic Cofund, SusOrgPlus
Agrovoc keywords:
analytical methods
energy consumption
Subjects: Food systems > Food security, food quality and human health
Food systems > Processing, packaging and transportation
Research affiliation: European Union > CORE Organic > CORE Organic Cofund > SusOrgPlus
Germany > Federal Organic Farming Scheme - BOELN > Food > Processing
Germany > University of Kassel > Department of Agricultural Engineering and Agricultural Engineering in the Tropics and Subtropics
Horizon Europe or H2020 Grant Agreement Number:727495
Related Links:https://www.susorgplus.eu, https://orgprints.org/cgi/search/advanced?addtitle%2Ftitle=&keywords=17OE005&projects=BOEL&_order=bypublication&_action_search=Suchen
Deposited By: von Gersdorff, Gardis J.E.
ID Code:38727
Deposited On:08 Jan 2021 12:09
Last Modified:08 Jan 2021 12:09
Document Language:English
Refereed:Peer-reviewed and accepted

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