The possibilities of balancing gas supply and demand with a green gas supply chain were analyzed. The considered supply chain is based on co-digestion of cow manure and maize, the produced biogas is upgraded to (Dutch) natural gas standards. The applicability of modeling yearly gas demand data in a geographical region by Fourier analysis was investigated. For a sine shape gas demand, three scenarios were further investigated: varying biogas production in time, adding gas storage to a supply chain, and adding a second digester to the supply chain which is assumed to be switched off during the summer months. A regional gas demand modeled by a sine function is reasonable for household type of users as well as for business areas, or a mixture of those. Of the considered scenarios, gas storage is by far the most expensive. When gas demand has to be met by a green gas supply chain, flexible biogas production is an interesting option. Further research in this direction might open interesting pathways to sustainable gas supply chains.
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One of the issues concerning the replacement of natural gas by green gas is the seasonal pattern of the gas demand. When constant production is assumed, this may limit the injected quantity of green gas into a gas grid to the level of the minimum gas demand in summer. A procedure was proposed to increase thegas demand coverage in a geographical region, i.e., the extent to which natural gas demand is replaced by green gas. This was done by modeling flexibility into farm-scale green gas supply chains. The procedure comprises two steps. In the first step, the types and number of green gas production units are determined,based on a desired gas demand coverage. The production types comprise time-varying biogas production, non-continuous biogas production (only in winter periods with each digester having a specified production time) and constant production including seasonal gas storage. In the second step locations of production units and injection stations are calculated, using mixed integer linear programming with cost price minimization being the objective. Five scenarios were defined with increasing gas demand coverage, representing a possible future development in natural gas replacement. The results show that production locations differ for each scenario, but are connected to a selection of injection stations, at least in the considered geographical region under the assumed preconditions. The cost price is mainly determined by the type of digesters needed. Increasing gas demand coverage does not necessarily mean a much higher cost price.
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Renewable energy sources have an intermittent character that does not necessarily match energy demand. Such imbalances tend to increase system cost as they require mitigation measures and this is undesirable when available resources should be focused on increasing renewable energy supply. Matching supply and demand should therefore be inherent to early stages of system design, to avoid mismatch costs to the greatest extent possible and we need guidelines for that. This paper delivers such guidelines by exploring design of hybrid wind and solar energy and unusual large solar installation angles. The hybrid wind and solar energy supply and energy demand is studied with an analytical analysis of average monthly energy yields in The Netherlands, Spain and Britain, capacity factor statistics and a dynamic energy supply simulation. The analytical focus in this paper differs from that found in literature, where analyses entirely rely on simulations. Additionally, the seasonal energy yield profile of solar energy at large installation angles is studied with the web application PVGIS and an hourly simulation of the energy yield, based on the Perez model. In Europe, the energy yield of solar PV peaks during the summer months and the energy yield of wind turbines is highest during the winter months. As a consequence, three basic hybrid supply profiles, based on three different mix ratios of wind to solar PV, can be differentiated: a heating profile with high monthly energy yield during the winter months, a flat or baseload profile and a cooling profile with high monthly energy yield during the summer months. It is shown that the baseload profile in The Netherlands is achieved at a ratio of wind to solar energy yield and power of respectively Ew/Es = 1.7 and Pw/Ps = 0.6. The baseload ratio for Spain and Britain is comparable because of similar seasonal weather patterns, so that this baseload ratio is likely comparable for other European countries too. In addition to the seasonal benefits, the hybrid mix is also ideal for the short-term as wind and solar PV adds up to a total that has fewer energy supply flaws and peaks than with each energy source individually and it is shown that they are seldom (3%) both at rated power. This allows them to share one cable, allowing “cable pooling”, with curtailment to -for example-manage cable capacity. A dynamic simulation with the baseload mix supply and a flat demand reveals that a 100% and 75% yearly energy match cause a curtailment loss of respectively 6% and 1%. Curtailment losses of the baseload mix are thereby shown to be small. Tuning of the energy supply of solar panels separately is also possible. Compared to standard 40◦ slope in The Netherlands, facade panels have smaller yield during the summer months, but almost equal yield during the rest of the year, so that the total yield adds up to 72% of standard 40◦ slope panels. Additionally, an hourly energy yield simulation reveals that: façade (90◦) and 60◦ slope panels with an inverter rated at respectively 50% and 65% Wp, produce 95% of the maximum energy yield at that slope. The flatter seasonal yield profile of “large slope panels” together with decreased peak power fits Dutch demand and grid capacity more effectively.
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Summary Project objectives This study fits into a larger research project on logistics collaboration and outsourcing decisions. The final objective of this larger project is to analyze the logistics collaboration decision in more detail to identify thresholds in these decisions. To reach the overall objectives, the first step is to get a clearer picture on the chemical and logistics service providers industry, sectors of our study, and on logistics collaboration in these sectors. The results of this first phase are presented in this report. Project Approach The study consists of two parts: literature review and five case studies within the chemical industry. The literature covers three topics: logistics collaboration, logistics outsourcing and purchasing of logistics services. The five case studies are used to refine the theoretical findings of the literature review. Conclusions Main observations during the case studies can be summarized as follows: Most analyzed collaborative relationships between shippers and logistics service providers in the chemical industry are still focused on operational execution of logistics activities with a short term horizon. Supply management design and control are often retained by the shippers. Despite the time and cost intensive character of a logistics service buying process, shippers tendering on a very regular basis. The decision to start a new tender project should more often be based on an integral approach that includes all tender related costs. A lower frequency of tendering could create more stability in supply chains. Beside, it will give both, shippers and LSPs, the possibility to improve the quality of the remaining projects. Price is still a dominating decision criterion in selecting a LSP. This is not an issue as long as the comparison of costs is based on an integral approach, and when shippers balance the cost criterion within their total set of criteria for sourcing logistics services. At the shippers' side there is an increased awareness of the need of more solid collaboration with logistics service providers. Nevertheless, in many cases this increased awareness does not actually result in the required actions to establish more intensive collaboration. Over the last years the logistics service providers industry was characterized by low profit margins, strong fragmentation and price competition. Nowadays, the market for LSPs is changing, because of an increasing demand for logistics services. To benefit from this situation a more pro-active role of the service providers is required in building stronger relationships with their customers. They should pay more attention on mid and long term possibilities in a collaborative relation, in stead of only be focused on running the daily operation.
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The future energy system could benefit from the integration of independent gas, heat and electricity infrastructures. Such a hybrid energy network could support the increase of intermittent renewable energy sources by offering increased operational flexibility. Nowadays, the expectations on Natural Gas resources forecast an increase in the application of Liquefied Natural Gas (LNG), as a means of storage and transportation, which has a high exergy value. Therefore, we analyzed the integration of decentralized LNG regasification with a Waste-to-Energy (W2E) plant for a practice-based case to get an idea on how it might affect the balancing of supply and demand, under optimized exergy efficient conditions. We compared an independent system with an integrated system that consists of the use of the LNG cold to cool the condenser of the W2E plant, as well as the expansion of the regasified LNG in an expander, using a simplified deterministic model based on the energy hub concept. We use the hourly measured electricity and heat demand patterns for 200 households with 35% of the households producing electricity from PV according to a typical measured solar insolation pattern in The Netherlands. The results indicate that the integration affects the imbalance for electricity and heat compared to the independent system. If the electricity demand is met, both the total yearly heat shortage and heat excess are reduced for the integrated system. If the heat demand is met, the total yearly electricity shortage is also reduced (with 100 MWh). However, the total yearly electricity excess is then increased (with 300 MWh). We observed that these changes are solely due to the increase in exergy efficiencies for heat and electricity of the W2E Rankine cycle. The efficiency of the expander is too low to offer a significant contribution to the electricity demand. Therefore, future research should focus on the affect that can be obtained by to other means of integration (e.g. Organic Rankine Cycle and Stirling Cycle).
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Creative SMEs are heavily focusing on the creating process designing new products and services. Consequently, their managers tend to loose contact with crucial management issues. Especially their knowledge of the financial aspects of their business can be so limited that they fail to connect with the financial viability of their business, which can lead to serious business problems. This paper draws on a number of studies that examine the role of outsiders -contracted professional service providers- in relation to business success of SMEs. In the light of the potential growth of Flemish creative SMEs on international markets the question can be raised as to what extent outsiders, and more specifically financial service providers like accountants and banks, contribute to the export success of these firms. In this paper therefore the role played by accountants and banks was explored to solve export-related questions by small furniture designers in Flanders, Belgium. Export can be considered as the most successful growth and therefore raises interesting management issues for creative SMEs. Little is known about the content and intensity of services of accountants and bank employees in relation to export-related questions of owner-managers of small creative firms. In order to examine the fit between supply and demand the focus is on outsider contribution during six phases of export.
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Analyse the results from a representative selection of the supply chain studies for school feeding programmes in Kenya, Ghana and Mali, and make specific suggestions for interventions that can efficiently include SHF in the supply chains.
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The Bio-P2G-program (Bio-Power to Gas) at the Hanze University of AppliedSciences evaluates the technologic feasibility of the biological reduction of carbondioxide with hydrogen to methane (biomethanation: 1 CO2 + 4 H2 -> CH4 + 2 H2O)Chemically, this process is known as the Sabatier reaction, but within anaerobicdigestion the biological methanation is catalyzed by a specific group ofmicroorganisms: the hydrogenotrophic methanogens.
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The theoretical framework of this dissertation is based on Amartya Sen’s capability approach (Chapter 2). In the early 1980s, development economist Amartya Sen developed the capability framework as a broad normative framework for the evaluation and assessment of individual well-being and social arrangements mainly in countries in the Global South (Sen, 1999, 2009). I chose the capability approach was chosen because of its strong focus on the notion of freedom as the capability to live the life each individual is aiming for. The freedom to choose a particular lifestyle is an intrinsic part of Sen’s notions of agency and well-being (Sen, 1999). After elaborating on notions of agency and well-being in detail, I turn to the role of financial self-help groups and how their members are influenced by social structures. This chapter concludes by operationalizing the theoretical framework into three capabilities (C1–C3) that serve as sensitizing concepts throughout the dissertation. These capabilities focus on the potential impact CAF groups have on members’ abilities to develop social networks (C1), to control their financial household management (C2), and to adopt an enterprising attitude (C3). Chapter 3 discusses my research methodology. I describe how the three capabilities (C1–C3) were applied as sensitizing concepts in the set-up of this particular action research (Blumer, 1954). I also explain in more detail how, by using sensitizing concepts, I combined an inductive research approach with a deductive angle. Then, I elaborate on the fundamental elements of this action research project: the implementation of the CAF groups as well as the collection and analysis of the empirical data. Finally, I reflect on how I designed and carried out this action research, with a special focus on the interaction between researcher and CAF members as research participants. A more detailed background description of the Dutch financial landscape is provided in Chapter 4. The chapter focuses on two particular financial self-help groups: ROSCAs among Ethiopians and Ghanaians living in the Netherlands. Compared to the formal banking system dominating the current financial landscape, these financial self-help groups claim effectivity instead of efficiency in the operation and management of their respective groups. By exploring developments in the current financial landscape, this chapter argues that distinguishing different kinds of resilience creates possibilities for analysing the different roles of financial arrangements and institutions for the financial landscape. Thus, this explorative study on ROSCAs questions the dominance of the financial side of the coin that has resulted from the efficiency-driven institutions of the financial sector. Chapter 5 presents each CAF group in more detail. The reader gets to know the different members of each CAF group and their motivations to join. Financial performance is assessed according to members’ savings and loan behaviour during the period of their participation. The quantitative data is analysed on how much the members of a respective CAF group saved and how much they borrowed from the group’s fund during the entire period of the research. These insights help the reader to better understand the differences and similarities between the five CAF groups. Chapter 6 discusses the empirical findings from the first three CAF groups. This chapter explores whether and how participation in a CAF group improves individuals’ well-being with regard to expanding their social networks, improving their financial household management, and strengthening their entrepreneurial positions. It also shows how participating in CAF groups at the grassroots level contributes to the well- Balancing the social and financial sides of the coin26being of vulnerable people in the Netherlands. Finally, the chapter reconsiders Sen’s notion of freedom for the particular context of overconsumption, inequality, and overindebtedness. In applying Sen’s capability approach, I realized that the approach has a “blind spot” regarding individuals’ possible impacts on the structures within and around them. By adding notions of Giddens’s structuration theory to the core concepts of the capability approach, I rendered the capability approach more sensitive to how CAF-group members may interact with their surrounding structures (Chapter 7). The relation between individuals and surrounding societal structures is extensively discussed in what is often referred to as the agency-structure debate (Ritzer, 2003). This debate is based on differing views about whether and to what extent individuals have a free will and can act according to their preferences, values, and personal feelings, or to what extent they are the “product” of their surrounding social structures. By expanding the capability approach with the notions of internal structures, on the one hand, and more proximate and more distant societal structures, on the other (Stones, 2008), I detail not only how individual agents are influenced by their surrounding structures, but how they might also have – however small and modest – an impact on those structures themselves. As a result, this chapter not only provides answers to how CAF-group participation affects individual members’ access to social networks, their financial household management, and their entrepreneurial positioning, but it also enabled me to investigate how and why individuals join a CAF group to take part in a so-called countermovement. Thus, I also consider how CAF members could possibly play a role in their surrounding social structures, like the existing financial landscape and the emerging participation society in the Netherlands.One way in which a CAF group can play a role in the surrounding structures is to become a community of practice. Wenger (1998) describes a community of practice as a group of people who share a certain domain of interest that distinguishes them from others. In a community of practice, it is crucial to learn from each other by engaging in joint activities and discussions. To discuss whether and how some of the CAF groups studied here turned into a community of practice, I apply the criteria of a common goal, trust, democratic leadership, and accumulation of knowledge in Chapter 8. The application of these criteria to the functioning of the CAF groups also provides more insight into how members interacted which each other in the different CAF groups. I will show how two of the five CAF groups indeed turned into communities of practice. Chapter 9 concludes this dissertation by linking the empirical findings on the individual level (Chapters 6 and 7) with those on the group level (Chapter 8). I follow this with a general discussion of the main contribution to theory development made by the Balancing the social and financial sides of the coin27expansion of Sen’s capability approach with Giddens’s structuration theory. Then, I discuss the role of CAF groups in enabling individual participants to balance the social and financial sides of the coin. Finally, I conclude this dissertation by showing how CAF groups have the potential to empower their members to meet the expectations of the participation society and the challenges of the contemporary financial landscape. I also provide recommendations for how engaged scholars doing action research can be reflective about the way they interact with their research participants and for how practitioners can set up CAF groups in the field. In the Epilogue, I tell the story of Cash2Grow. Based on the experiences and findings of my research, I co-founded the Cash2Grow foundation to promote savings groups in the Netherlands as a tool for financial and social empowerment. By developing improved savings-group methodologies and financial education tools, the foundation aims to train staff and volunteers from different types of (welfare) organizations to establish savings groups among their target populations. At the moment, we are also collaborating with similar organizations in Spain, Italy, Germany, and Poland to learn more from each other in a project subsidized by the EU.
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In discussions on smart grids, it is often stated that residential end-users will play a more active role in the management of the electric power system. Experience in practice on how to empower end-users for such a role is however limited. This paper presents a field study in the first phase of the PowerMatching City project in which twenty-two households were equipped with demand-response-enabled heating systems and white goods. Although end-users were satisfied with the degree of living comfort afforded by the smart energy system, the user interface did not provide sufficient control and energy feedback to support an active contribution to the balancing of supply and demand. The full potential of demand response was thus not realized. The second phase of the project builds on these findings by design, implementation and evaluation of an improved user interface in combination with two demand response propositions. © 2013 IEEE.
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