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| 2. |
- Holtz, Emma, 1969, et al.
(författare)
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The influence of dielectric and sorption properties on drying behaviour and energy efficiency during microwave convective drying of selected food and non-food inorganic materials
- 2010
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Ingår i: Journal of Food Engineering. - : Elsevier BV. - 0260-8774 .- 1873-5770. ; 97:2, s. 142-153
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Tidskriftsartikel (refereegranskat)abstract
- The average energy efficiency of microwave convective drying is strongly related to drying time and thus to drying kinetics. This study investigates the energy efficiency of materials with different material properties and drying rates. Four solid, porous materials (swede, potato, bread, and lightweight concrete) were dried under the same microwave convective drying conditions. Drying behaviour, temperature development, hygroscopicity, dielectric properties, and specific energy consumption were studied. Despite differences in kinetics and product properties, the specific energy consumption (MJ/kg evaporated water) was approximately the same for all materials at intermediate to high moisture contents. When drying was pursued into the hygroscopic region, however, the specific energy consumption increased. The results indicate that a relationship between microwave penetration depth and water activity of the materials may be found. Drying of the food materials was limited by burning either due to temperature runaway in the hygroscopic region or due to development of hot spots, possibly induced by material structure.
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| 3. |
- Kurdve, Martin, 1971, et al.
(författare)
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Challenges for lean thinking in food waste recycling management in a Swedish supply chain
- 2019
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Ingår i: PLAN's Forsknings- och Utvecklingskonferens 2019.
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Konferensbidrag (refereegranskat)abstract
- Recycling and waste management industry is important for future circular material flows. The food waste logistic and recycling operations need to be managed efficiently both in terms of material efficiency and cost of operations. Supply chain challenges include extraction of the residual material, retaining material quality with low contamination, and to produce a marketable material. Consumer waste/residual material is particularly challenging in these respects. Lean is a management concept with focus on quality, flow and improvement for customers. Important lean management principles for are; Continuous improvement, Respect for people, Standardised way of work, Just in time and Right from me quality. These principles can be simulated in lean games to facilitate discussions on improving the system. Benefits from using lean management in manufacturing have been lower costs, improved customer value, and competitiveness, reached through less transport, handling and inventory losses. The recycling and waste management industry differs from manufacturing by having less value of the products and a system providing simultaneous services and products to different customers. This study used literature, process data, including observations and operator interviews, and a workshop using a lean simulation game to initiate lean thinking discussion concerning improvement measures in food waste collection and recycling. The aim with this paper is to find in what areas (if any) there is potential for lean management implementation and the challenges for implementing such management in the food waste recycling chain. The results showed several applicable lean principles in the recycling industry. The industry has focus on flow and in many respects the transportation sub-system of the studied chain is efficient, although carrier return is a significant system loss. Information flow and goal settings have improvement opportunities. Disturbance in the information flow is not unique to recycling industry but give challenges. Paying customers in each end of the value flow with various requirements adds complexity for food waste recycling. Using the lean simulation game and value stream map were appropriate to enhance understanding of the value chain. Distinguishing value-reducing activities from other non-value adding activities may be important in waste management processes. This study contributes with a case study applying lean management tools in municipal waste management of food waste and with conceptualisations for further green lean, and sustainable supply chain management research in recycling and waste management industry.
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- Malafronte, Loredana, 1986, et al.
(författare)
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Combined convective and microwave assisted drying: Experiments and modelling
- 2012
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Ingår i: Journal of Food Engineering. - : Elsevier BV. - 0260-8774 .- 1873-5770. ; 112:4, s. 304-312
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Tidskriftsartikel (refereegranskat)abstract
- The drying process is largely used in many different industrial applications, such as treatment of foods,production of cosmetics and pharmaceuticals, manufacturing of paper, wood and building materials,polymers and so on.Physical and mathematical models can constitute useful tools to establish the influence of the main process variables on the final product quality, in order to apply an effective production control. In this work, simulation model was developed to describe combined convective/microwave assisted drying. In particular, a multi-physics approach was applied to take into account heat and two mass balances (for liquid water and for water vapor) and Maxwell’s equations to describe electromagnetic field propagation.Potato matrix was selected as food material; a waveguide with a rectangular cross section, equipped with a hot air circulator device, was used as microwave applicator. The proposed model was found able to describe the process, being thus a useful tool for design and management of the process itself.
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