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Audenaert A.,Artesis University College of Antwerp | Audenaert A.,University of Antwerp | De Boeck L.,Center for Modeling and Simulation | De Boeck L.,University of Management and Economics | And 3 more authors.
Renewable Energy

In this paper an economic evaluation of photovoltaic grid connected systems (PVGCS) for companies situated in Flanders (Belgium) is conducted by using a generic Excel model. The model is unique in that it includes the dimension of taxation. This inclusion is required, otherwise the fiscal benefit of using solar panels is not accounted for. The model uses the cash flow projection method. This technique allows the calculation of the following classical evaluation criteria: net present value, internal rate of return, payback period, discounted payback period, profitability index, yield unit cost, yield unit revenue and break-even turnkey cost. Their outcome makes it possible to answer the question whether installing a PVGCS in Flanders is a responsible financial investment for companies. Furthermore, the paper estimates whether the corporate environment is ready for a subsidy legislation change. This change has recently been announced and as such it is possible to gauge whether the current market situation is profitable given future legislation. © 2010 Elsevier Ltd. Source

Audenaert A.,Artesis University College of Antwerp | Audenaert A.,University of Antwerp | De Boeck L.,Center for Modeling and Simulation | De Boeck L.,University of Management and Economics | Roelants K.,Student Lessius

Energy efficiency in buildings has become a key goal of any energy policy. Europe relies on the Energy Performance of Buildings Directive (EPBD), which has been converted by Flanders into the 'Energy Performance and Interior Climate' (EPB). Taking into account this Flemish EPB-standard (in terms of maximum U-values, E-level and K-value), this study seeks the economically most profitable combination of insulation - facade, roof, floor and glazing - for the Flemish citizen. For this purpose, a scenario-analysis is conducted using the EPB-software Flanders and a self-designed Excel file. Based on some important profitability criteria, the most profitable combination is determined for three representative types of dwellings studied. The scenario-analysis generates some well-founded guidelines for the Flemish citizen when building a house. It shows that in order to ensure the maximum profitability from investment in insulation, the key factor for the semi-detached dwelling is the insulation of roof and floor, whereas for a detached dwelling the key factor is the insulation of facade and floor. As a subsidiary consideration, the study also indicates that the U-values resulting from the more stringent E-level are still not sufficiently stringent because the U-values obtained for the most profitable combination are far below their maximum value. The same consideration applies in the case of the K-value. © 2010 Elsevier Ltd. Source

Bhosale S.V.,University of Pune | Bhosale S.V.,Sir Parashurambhau College | Bankar D.N.,Center for Modeling and Simulation | Bhoraskar S.V.,University of Pune | Mathe V.L.,University of Pune
Journal of Environmental Chemical Engineering

The paper reports the influence of electro-kinetic properties of nanoparticles of NiFe2O4 on the adsorption of humic substances (HS); with an aim of understanding their adsorption behavior. Crystalline single phase magnetic nanoparticles of NiFe2O4 are synthesized by gas phase condensation method using DC thermal plasma reactor. Due to the high temperature and steep temperature gradient this method helps in producing highly crystalline nanoparticles with sufficiently large number of surface states suitable for adsorption. These particles possessed high value of zeta potential, reducing their agglomeration and resulting into an enhanced adsorption capacity. However no significant influence of plasma parameters is observed on their zeta-potential and iso-electric values. The adsorption kinetics is studied and fitted to non-linear kinetic models and the best fit is observed for the pseudo first-order model. The analysis of adsorption isotherms suggests that the non-linear Langmuir model fits better as compared to Freundlich adsorption model. The adsorption of HS onto the nanoparticles is seen to depend on the pH value of the solution. A maximum adsorption of 5.2 mg/g is obtained at pH value of 3.64. These results suggest that plasma synthesized nanoparticles of NiFe2O4 have high colloidal stability and can be employed as efficient adsorbents for the removal of humic substances from water sources. © 2016 Elsevier Ltd. All rights reserved. Source

Belien J.,Center for Modeling and Simulation | Belien J.,Research Center for Operations Management | De Boeck L.,Center for Modeling and Simulation | De Boeck L.,Research Center for Operations Management | And 5 more authors.
Decision Support Systems

This paper presents a mixed integer linear programming (MILP) long-term decision model to optimize the location of organ transplant centers. The objective is to minimize the sum of the weighted time components between the moment a donor organ becomes available and its transplantation into the recipient's body. The weight factor for the elapsed time before the organ's removal from the donor body allows to assign a lower weight to this time component in the objective function in order to reflect the criticality of the process after the organ's removal. The specificity of organ transplants makes the model more complex than a traditional facility location model. The model is applied to the Belgian organ transplant path. Extensive numerical experiments reveal the key factors that impact the long-term decision of centralizing versus decentralizing transplant centers. © 2012 Elsevier B.V. Source

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