The Experts below are selected from a list of 315 Experts worldwide ranked by ideXlab platform
W.j.t. Van Gemert - One of the best experts on this subject based on the ideXlab platform.
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Operational modeling of a sustainable gas supply chain
Engineering in Life Sciences, 2010Co-Authors: Jan Bekkering, Ton A. Broekhuis, W.j.t. Van GemertAbstract:Biogas production from codigestion of cattle manure and biomass can have a significant contribution to a sustainable gas supply when this gas is upgraded to specifications prescribed for injection into the national gas grid and injected into this grid. In this study, we analyzed such a gas supply chain in a Dutch situation. A model was developed with which the Cost Price per m(n)(3) was presented as a function of scale level (m(n)(3)/hr). The hypothesis that transport Costs increase with increasing scale level was confirmed although this is not the main factor influencing the Cost Price for the considered production scales. For farm-scale gas supply chains (approximately 150-250 m(n)(3)/h green gas), a significant improvement is expected from decreasing Costs of digesters and upgrading installations, and efficiency improvement of digesters. In this study also practical sustainability criteria for such a supply chain were investigated. For this reason, the digestate from the digester should be used as a fertilizer. For larger scale levels, the number of transport movements and energy use in the supply chain seem to become a limiting factor with respect to sustainability.
Jan Bekkering - One of the best experts on this subject based on the ideXlab platform.
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The challenge of implementing green gas into the gas supply
2014Co-Authors: Jan BekkeringAbstract:In order to gain a more mature share in the future energy supply, green gas supply chains face some interesting challenges. The thesis addresses the question how future green gas systems may look like. Green gas supply chains, based on co-digestion of cow manure and maize, have been studied. The produced biogas is upgraded to natural gas quality and injected into the existing distribution gas grid and thus replacing natural gas. A practical way of calculating the Cost Price of green gas was developed, taking scale and sustainability criteria into account. The way such supply chains can deal with season dependent gas demand was also investigated. Results show that, to meet such a gas demand by a green gas supply chain, flexible biogas production is the most promising from a Cost Price point of view. This research was further expanded into a geographical model to simulate several degrees of natural gas replacement by green gas. Finally, ways to optimize green gas supply chains in terms of energy efficiency and greenhouse gas reduction were explored. It was shown that with the current technology greenhouse gas reductions of more than 80 % are possible. Multiple improvement options will have to be implemented in green gas supply chains, in order to meet the sustainability targets set by the EU. Overall it can be concluded that the used modeling approach gives opportunities to investigate variations in green gas supply chains in a practical way. Future research may comprise flexible biogas production and a useful application of digestate. An extension of this research may be the further exploration of possible biogas production locations, together with governments, farmers and other stakeholders. Optimal use of arable land and waste streams are part of this.
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Operational modeling of a sustainable gas supply chain
Engineering in Life Sciences, 2010Co-Authors: Jan Bekkering, Ton A. Broekhuis, W.j.t. Van GemertAbstract:Biogas production from codigestion of cattle manure and biomass can have a significant contribution to a sustainable gas supply when this gas is upgraded to specifications prescribed for injection into the national gas grid and injected into this grid. In this study, we analyzed such a gas supply chain in a Dutch situation. A model was developed with which the Cost Price per m(n)(3) was presented as a function of scale level (m(n)(3)/hr). The hypothesis that transport Costs increase with increasing scale level was confirmed although this is not the main factor influencing the Cost Price for the considered production scales. For farm-scale gas supply chains (approximately 150-250 m(n)(3)/h green gas), a significant improvement is expected from decreasing Costs of digesters and upgrading installations, and efficiency improvement of digesters. In this study also practical sustainability criteria for such a supply chain were investigated. For this reason, the digestate from the digester should be used as a fertilizer. For larger scale levels, the number of transport movements and energy use in the supply chain seem to become a limiting factor with respect to sustainability.
Yue Ling Liu - One of the best experts on this subject based on the ideXlab platform.
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comparison of the Cost performance between pure cashmere siro spun yarn and pure rabbit hair ring spun yarn
Advanced Materials Research, 2011Co-Authors: Yue Ling LiuAbstract:This paper systematically analysied and measured the main properties of the pure cashmere siro-spun yarn and pure rabbit hair ring-spun yarn, including the yarn evenness, thin and thick , neps, raw material nature, yarn strength, yarn hairiness, twist level, wearing resistance and etc. And the market Price of yarn was also investigated. The model of the Cost performance ratio was established to analyse the yarn properties scientifically. The results indicated that the pure rabbit hair yarn is better than the pure cashmere yarn. It provided the guidance suggestions and scientific basis for the manufacturers to improve the performance and reduce the Cost Price of the yarn.
Ton A. Broekhuis - One of the best experts on this subject based on the ideXlab platform.
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Operational modeling of a sustainable gas supply chain
Engineering in Life Sciences, 2010Co-Authors: Jan Bekkering, Ton A. Broekhuis, W.j.t. Van GemertAbstract:Biogas production from codigestion of cattle manure and biomass can have a significant contribution to a sustainable gas supply when this gas is upgraded to specifications prescribed for injection into the national gas grid and injected into this grid. In this study, we analyzed such a gas supply chain in a Dutch situation. A model was developed with which the Cost Price per m(n)(3) was presented as a function of scale level (m(n)(3)/hr). The hypothesis that transport Costs increase with increasing scale level was confirmed although this is not the main factor influencing the Cost Price for the considered production scales. For farm-scale gas supply chains (approximately 150-250 m(n)(3)/h green gas), a significant improvement is expected from decreasing Costs of digesters and upgrading installations, and efficiency improvement of digesters. In this study also practical sustainability criteria for such a supply chain were investigated. For this reason, the digestate from the digester should be used as a fertilizer. For larger scale levels, the number of transport movements and energy use in the supply chain seem to become a limiting factor with respect to sustainability.
Marike Brits - One of the best experts on this subject based on the ideXlab platform.
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Surviving the Cost-Price squeeze
2016Co-Authors: W.a. Lombard, Marike BritsAbstract:We are increasingly seeing fewer but larger farming units as farmers increase the size of their operations to exploit the benefits of economies of scale in an attempt to survive the agricultural Cost-Price squeeze. This is nothing new and commercial farming has become used to this scenario. Is it, however, possible for smaller farm units to survive this phenomenon?
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Surviving the Cost-Price squeeze : current affairs
2016Co-Authors: W.a. Lombard, Marike BritsAbstract:We are increasingly seeing fewer but larger farming units as farmers increase the size of their operations to exploit the benefits of economies of scale in an attempt to survive the agricultural Cost-Price squeeze. This is nothing new and commercial farming has become used to this scenario. Is it, however, possible for smaller farm units to survive this phenomenon?
