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Energy and Exergy Analysis for Low-Temperature Refrigeration System for Biogas Upgrading

Journal of Energy and Power Engineering 2017年第1期11卷 11-15页

作者： Joseph Bassila Joseph Toubassy denis Clodic Amelie danlos Cryo Pur 3 rue de la Croix Martre 91120 Palaiseau France Conservatoire National des Arts et M&tiers Laboratoire de Chimie Moldculaire G&nie des Procedes Chimiques et Energetique(CNAM-CMGPCE EA 7341) 292 rue Saint Martin 75003 Paris France

Low-temperature refrigeration system for biogas upgrading has been developed by the Cryo Pur company based on cooling biogas in three steps： Removing most of the water content at -40 ℃, removing siloxanes and SVOCs at -85 ℃ and frosting CO2 at temperatures varying from -90 ℃ to -120 ℃. This process transforms biogas containing typically 60% methane, 35% CO2, 5% water vapor in methane containing 2.5% of CO2. This paper studies how a single low-temperature refrigeration system is able to cool biogas with an indirect system using low-temperature heat-transfer fluids. The exergy study defines the exergy losses and served as guidance for the energy/pinch analysis that is used for the design of the heat-exchanger series and the appropriate heat recovery. An optimal system could save up to 40% of the electric consumption of the refrigeration system.

关键词： Biogas upgrading exergy analysis pinch analysis refrigeration cascade.

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design and Performance of a Controlled Environment Mini-chamber for Measuring Produce Quality deterioration

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Journal of Agricultural Science and Technology(B) 2012年第4期2卷 391-399页

作者： denyse I. LeBlanc Clement Vigneault Jereme Boutin Vicky Toussaint denis Charlebois Charles F.Fomey Gaetan Bourgeois Alain Clement Greg S. Bezanson Agriculture and Agri-Food Canada c/o Food Research Centre Universitd de Moncton 18 Antonine-Maillet Ave. Moncton NBE1A 3E9 Canada Agriculture and Agri-Food Canada Horticulture Research and Development Centre 430 Gouin Blvd Saint-Jean-sur-RichelieuQC J3B 3E6 Canada Agriculture and Agri-Food Canada Atlantic Food and Horticulture Research Centre 32 Main St. Kentville NS B4N IJS Canada Agricultureand Agri-Food Canada Food Research and Development Centre 3600 Casavant Bird West St-Hyacinthe QC J2S8E3 Canada

To minimize losses between harvest and retail display, a system is needed to track temperature and RH exposure of fresh produce and predict its quality at each step of the distribution chain. With accurate models, such system could （1） identify problematic situations before losses occur; （2） become a management tool for decision makers; and （3） help quantify the real impact of individual inappropriate conditions. A project was initiated to develop models required for such a decision system. Because the data required to develop models were not availab.e for most fruit and vegetables, a series of storage trials was planned for measuring changes in physiological and microbial quality, and development of physiological disorders and/or diseases, as a function of time, temperature and RH. To meet this objective, controlled environment mini-chambers were designed, built and instrumented for measuring the effect of traceable environmental conditions encountered during storage and transportation of fresh horticultural produce of similar size and shape as tomato. detailed design and performance evaluation of these mini-chambers are presented.

关键词： lab.scale storage chamber temperature relative humidity fruit and vegetable quality.

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