14 results found
Triantafyllidis CP, Samaras N, 2020, A new non-monotonic infeasible simplex-type algorithm for Linear Programming, PEERJ COMPUTER SCIENCE, ISSN: 2376-5992
Wang X, van Dam KH, Triantafyllidis C, et al., 2019, Energy-water nexus design and operation towards the sustainable development goals, COMPUTERS & CHEMICAL ENGINEERING, Vol: 124, Pages: 162-171, ISSN: 0098-1354
Kis Z, Koppelaar RHEM, Sule MN, et al., 2018, Framework for WASH sector data improvements in data-poor environments, applied to Accra, Ghana, Water, Vol: 10, ISSN: 2073-4441
Improvements in water, sanitation and hygiene (WASH) service provision are hampered by limited open data availability. This paper presents a data integration framework, collects the data and develops a material flow model, which aids data-based policy and infrastructure development for the WASH sector. This model provides a robust quantitative mapping of the complete anthropogenic WASH flow-cycle: from raw water intake to water use, wastewater and excreta generation, discharge and treatment. This approach integrates various available sources using a process-chain bottom-up engineering approach to improve the quality of WASH planning. The data integration framework and the modelling methodology are applied to the Greater Accra Metropolitan Area (GAMA), Ghana. The highest level of understanding of the GAMA WASH sector is achieved, promoting scenario testing for future WASH developments. The results show 96% of the population had access to improved safe water in 2010 if sachet and bottled water was included, but only 67% if excluded. Additionally, 66% of 338,000 m3 per day of generated wastewater is unsafely disposed locally, with 23% entering open drains, and 11% sewage pipes, indicating poor sanitation coverage. Total treated wastewater is <0.5% in 2014, with only 18% of 43,000 m3 per day treatment capacity operational. The combined data sets are made available to support research and sustainable development activities.
Triantafyllidis CP, Papageorgiou LG, 2018, An integrated platform for intuitive mathematical programming modeling using LaTeX, PEERJ COMPUTER SCIENCE, ISSN: 2376-5992
Bieber N, Kee JH, Wang X, et al., 2018, Erratum to "Sustainable planning of the energy-water-food nexus using decision making tools" [Energy Policy 113, (2018) 584, 2018], Energy Policy, Vol: 116, Pages: 289-289, ISSN: 0301-4215
Wang X, Guo M, Koppelaar RHEM, et al., 2018, A nexus approach for sustainable urban energy-water-waste systems planning and operation, Environmental Science and Technology, Vol: 52, Pages: 3257-3266, ISSN: 0013-936X
Energy, water and waste systems analyzed at a nexus level is key to move towards more sustainable cities. In this paper, the “resilience.io” platform is developed and applied to emphasize on waste-to-energy pathways, along with the water and energy sectors, aiming to develop waste treatment capacity and energy recovery with the lowest economic and environmental cost. Three categories of waste including wastewater (WW), municipal solid waste (MSW) and agriculture waste are tested as the feedstock for thermochemical treatment via incineration, gasification or pyrolysis for combined heat and power generation, or biological treatment such as anaerobic digestion (AD) and aerobic treatment. A case study is presented for Ghana in Sub-Saharan Africa, considering a combination of waste treatment technologies and infrastructure, depending on local characteristics for supply and demand. The results indicate that the biogas generated from waste treatment turns out to be a promising renewable energy source in the analyzed region, while more distributed energy resources can be integrated. A series of scenarios including the business-as-usual, base case, natural constrained, policy interventions and environmental and climate change impacts demonstrate how simulation with optimization models can provide new insights in the design of sustainable value chains, with particular emphasis on whole-system analysis and integration.
Triantafyllidis CP, Koppelaar RHEM, Wang X, et al., 2018, An integrated optimisation platform for sustainable resource and infrastructure planning, Environmental Modelling and Software, Vol: 101, Pages: 146-168, ISSN: 1364-8152
It is crucial for sustainable planning to consider broad environmental and social dimensions and systemic implications of new infrastructure to build more resilient societies, reduce poverty, improve human well-being, mitigate climate change and address other global change processes. This article presents resilience.io, 2 a platform to evaluate new infrastructure projects by assessing their design and effectiveness in meeting growing resource demands, simulated using Agent-Based Modelling due to socio-economic population changes. We then use Mixed-Integer Linear Programming to optimise a multi-objective function to find cost-optimal solutions, inclusive of environmental metrics such as greenhouse gas emissions. The solutions in space and time provide planning guidance for conventional and novel technology selection, changes in network topology, system costs, and can incorporate any material, waste, energy, labour or emissions flow. As an application, a use case is provided for the Water, Sanitation and Hygiene (WASH) sector for a four million people city-region in Ghana.
Bieber N, Ker JH, Wang X, et al., 2017, Sustainable planning of the energy-water-food nexus using decision making tools, Energy Policy, Vol: 113, Pages: 584-607, ISSN: 0301-4215
Developing countries struggle to implement suitable electric power and water services, failing to match infrastructure with urban expansion. Integrated modelling of urban water and power systems would facilitate the investment and planning processes, but there is a crucial gap to be filled with regards to extending models to incorporate the food supply in developing contexts. In this paper, a holistic methodology and platform to support the resilient and sustainable planning at city region level for multiple sectors was developed for applications in urban energy systems (UES) and the energy-water-food nexus, combining agent-based modelling - to simulate and forecast resource demands on spatial and temporal scales - with resource network optimization, which incorporates capital expenditures, operational costs, environmental impacts and the opportunity cost of food production foregone (OPF). Via a scenario based approach, innovative water supply and energy deployment policies are presented, which address the provision of clean energy for every citizen and demonstrate the potential effects of climate change. The results highlighted the vulnerability of Ghanas power generation infrastructure and the need for diversification. Feed-in tariffs and investment into supporting infrastructure and agriculture intensification will effectively increase the share of renewable energy and reduce carbon emissions.
Wang X, Guo M, Van Dam KH, et al., 2017, Waste-Energy-Water systems in sustainable city development using the resilience.io platform, 27th European Symposium on Computer Aided Process Engineering
Wang X, Van Dam KH, Triantafyllidis C, et al., 2017, Water and energy systems in sustainable city development: a case of Sub-saharan Africa, Urban Transitions Conference 2016, Publisher: Elsevier, Pages: 948-957, ISSN: 1877-7058
Current urban water and energy systems are expanding while increasing attention is paid to their social, economic and environmental impacts. As a research contribution that can support real-world decision making and transitions to sustainable cities and communities, we have built a model-based and data-driven platform combining comprehensive database, agent-based simulation and resource technology network optimization for system level water and energy planning. Several use cases are demonstrated based on the Greater Accra Metropolitan Area (GAMA) city-region in Ghana, as part of the Future Cities Africa (FCA) project. The outputs depict an overall resource landscape of the studied urban area, but also provide the energy, water, and other resource balance of supply and demand from both macro and micro perspectives, which is used to propose environmental friendly and cost effective sustainable city development strategies. This work is to become a core component of the resilience.io platform as an open-source integrated systematic tool gathering social, environmental and economic data to inform urban planning, investment and policy-making for city-regions globally.
Wang X, Guo M, van dam K, et al., 2017, Waste-Energy-Water systems in sustainable city development using the resilience.io platform, 27th European Symposium on Computer Aided Process Engineering
Dominguez-Ramos A, Triantafyllidis C, Samsatli S, et al., 2016, Renewable electricity integration at a regional level: Cantabria case study, Editors: Kravanja, Bogataj, Publisher: ELSEVIER SCIENCE BV, Pages: 211-216
Triantafyllidis C, Samaras N, 2015, Three nearly scaling-invariant versions of an exterior point algorithm for linear programming, OPTIMIZATION, Vol: 64, Pages: 2163-2181, ISSN: 0233-1934
Samaras N, Sifelaras A, Triantafyllidis C, 2009, A primal-dual exterior point algorithm for linear programming problems, Yugoslav Journal of Operations Research, Vol: 19, Pages: 123-132, ISSN: 0354-0243
The aim of this paper is to present a new simplex type algorithm for the Linear Programming Problem. The Primal - Dual method is a Simplex - type pivoting algorithm that generates two paths in order to converge to the optimal solution. The first path is primal feasible while the second one is dual feasible for the original problem. Specifically, we use a three-phase- implementation. The first two phases construct the required primal and dual feasible solutions, using the Primal Simplex algorithm. Finally, in the third phase the Primal - Dual algorithm is applied. Moreover, a computational study has been carried out, using randomly generated sparse optimal linear problems, to compare its computational efficiency with the Primal Simplex algorithm and also with MATLAB's Interior Point Method implementation. The algorithm appears to be very promising since it clearly shows its superiority to the Primal Simplex algorithm as well as its robustness over the IPM algorithm.
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