AEE - Institute of Sustainable Technologies

Gleisdorf, Austria

AEE - Institute of Sustainable Technologies

Gleisdorf, Austria
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Nageler P.,University of Graz | Zahrer G.,University of Graz | Heimrath R.,University of Graz | Mach T.,University of Graz | And 4 more authors.
Energy | Year: 2017

The modelling of whole urban districts requires an automated process to parameterize simulation tools. This paper presents a validated methodology for fully automated building modelling within urban districts based on publicly available data. Dynamic building models with detailed heating systems are created in the simulation environment IDA ICE. The method of data collecting and processing and result visualization in a geographical information system (GIS) and the data storage procedure in a PostgreSQL database is described in detail. The building simulation model is validated with consumption data available from 69 buildings of the town Gleisdorf (Austria). The results of the annual heating and domestic hot water demand show a good approximation to the measurement data with a mean deviation of −0.98%. The urban simulation process was then extended to the whole community with its 1945 buildings. This method helps to model and quantitatively describe current building stock in an efficient and timesaving way and enables to develop future smart energy systems, in which the buildings interact with the district heating networks, with limited effort. © 2017 Elsevier Ltd

Masi F.,IRIDRA Srl | El Hamouri B.,Institute Agronomique et Veterinaire Hassan II IAV | Abdel Shafi H.,National Research Center of Egypt | Baban A.,TUBITAK - Marmara Research Center | Regelsberger M.,AEE - Institute of Sustainable Technologies
Water Science and Technology | Year: 2010

Concerns about water shortage and pollution have received increased attention over the past few years, especially in developing countries with warm climate. In order to help local water management in these countries, the Euro-Mediterranean Regional Programme (MEDA) has financed the Zer0-m project ( As a part of this project, several constructed wetland (CW) pilot systems with different pre-treatments have been implemented in four Technological Demonstration Centres in Egypt, Morocco, Tunisia and Turkey. The aim of this research was to establish appropriate designs for treatment of segregated domestic black (BW) and grey water (GW). We tested several different multistage CW configurations, consisting of horizontal and vertical subsurface flow CW for secondary treatment and free water systems as tertiary stage. CW removal efficiencies of TSS, COD, BOD5, N-NH4 +, N-NO3, Ntot, total coliforms (TC) were evaluated for each of the implemented systems. The results from this study demonstrate the potential of CWs as a suitable technology for treating segregated domestic wastewater. A very efficient COD reduction (up to 98%) and nitrification (92-99%) was achieved for BW and GW in all systems. CW effluent concentrations were below 15 mg/L for BOD5, 1 mg/L for N-NO3 and 0.5 mg/L for N-NH4 + together with acceptable TC counts. Based on these results, we suggest adopting the design parameters used in this study for the treatment of segregated wastewater in the Mediterranean area. © IWA Publishing 2010.

Ghrabi A.,Center de Biotechnologie de la Technopole de Borj-Cedria | Bousselmi L.,Center de Biotechnologie de la Technopole de Borj-Cedria | Masi F.,IRIDRA Srl | Regelsberger M.,AEE - Institute of Sustainable Technologies
Water Science and Technology | Year: 2011

The paper presents the detailed design and some preliminary results obtained from a study regarding a wastewater treatment pilot plant (WWTPP), serving as a multistage constructed wetland (CW) located at the rural settlement of 'Chorfech 24' (Tunisia). The WWTPP implemented at Chorfech 24 is mainly designed as a demonstration of sustainable water management solutions (low-cost wastewater treatment), in order to prove the efficiency of these solutions working under real Tunisian conditions and ultimately allow the further spreading of the demonstrated techniques. The pilot activity also aims to help gain experience with the implemented techniques and to improve them when necessary to be recommended for wide application in rural settlements in Tunisia and similar situations worldwide. The selected WWTPP at Chorfech 24 (rural settlement of 50 houses counting 350 inhabitants) consists of one Imhoff tank for pre-treatment, and three stages in series: as first stage a horizontal subsurface flow CW system, as second stage a subsurface vertical flow CW system, and a third horizontal flow CW. The sludge of the Imhoff tank is treated in a sludge composting bed. The performances of the different components as well as the whole treatment system were presented based on 3 months monitoring. The results shown in this paper are related to carbon, nitrogen and phosphorus removal as well as to reduction of micro-organisms. The mean overall removal rates of the Chorfech WWTPP during the monitored period have been, respectively, equal to 97% for total suspended solids and biochemical oxygen demand (BOD 5), 95% for chemical oxygen demand, 71% for total nitrogen and 82% for P-PO 4. The removal of E. coli by the whole system is 2.5 log units. © IWA Publishing 2011.

Wallner G.M.,Johannes Kepler University | Povacz M.,Johannes Kepler University | Hausner R.,AEE - Institute of Sustainable Technologies | Lang R.W.,Johannes Kepler University
Solar Energy | Year: 2016

For the utilization of polymeric materials in high-demanding applications like solar thermal systems it is of utmost importance to define the performance requirements and to investigate the applicability of components for defined systems under service relevant conditions. This paper deals with the lifetime estimation of black-pigmented polypropylene (PP) absorber grades for overheating protected solar thermal collector systems for hot water preparation in five representative climate zones. Based on experimental aging data in hot air and heat carrier fluid at elevated temperatures (95. °C, 115. °C and 135. °C) and climatic input data, as well as deduced loading conditions and absorber temperature distributions, the lifetime was calculated using a theoretical and an empirical extrapolation approach and assuming cumulating damages in service relevant temperature intervals. Depending on the PP grade, the extrapolation method and the location, endurance limits ranging from 8 to 50 years were obtained. The PP grade with ß-spherulithic structures and less carbon black exhibited a superior performance (factor 2) compared to a well-established grade which is currently widely used for swimming pool absorbers. © 2015 Elsevier Ltd.

Muster-Slawitsch B.,AEE - Institute of Sustainable Technologies | Brunner C.,AEE - Institute of Sustainable Technologies | Padinger R.,Joanneum Research | Schnitzer H.,University of Graz
Chemical Engineering Transactions | Year: 2011

A newly developed algorithm for heat exchanger network design has been successfully tested in several case studies on its practical application potential. The combinatorial approach is based on an adapted time slice model and highlights the use of internal heat exchange, as well as exergetic considerations of heat exchangers. Results of a simple industrial case study are shown and outlook for future challenges are given. Copyright © 2011, AIDIC Servizi S.r.l.

Carlsson B.,Linnaeus University | Meir M.,Aventa AS | Rekstad J.,Aventa AS | Preiss D.,AEE - Institute of Sustainable Technologies | Ramschak T.,AEE - Institute of Sustainable Technologies
Solar Energy | Year: 2016

The pros and cons of replacing traditional materials with polymeric materials in solar thermosiphon systems were analysed by adopting a total cost accounting approach. In terms of climatic and environmental performance, polymeric materials reveal better key figures than traditional ones like metals. In terms of present value total cost of energy, taking into account functional capability, end user investment cost, O&M cost, reliability and climatic cost, the results suggest that this may also be true when comparing a polymeric based thermosiphon system with a high efficient thermosiphon system of conventional materials for DHW production in the southern Europe regions. When present values for total energy cost are assessed for the total DHW systems including both the solar heating system and the auxiliary electric heating system, the difference in energy cost between the polymeric and the traditional systems is markedly reduced. The main reason for the difference in results can be related to the difference in thermal performance between the two systems. It can be concluded that the choice of auxiliary heating source is of utmost importance for the economical competiveness of systems and that electric heating may not be the best choice. © 2015 Elsevier Ltd.

Beccali M.,University of Palermo | Cellura M.,University of Palermo | Finocchiaro P.,University of Palermo | Guarino F.,University of Palermo | And 2 more authors.
Solar Energy | Year: 2014

Starting from the results of a Life Cycle Assessment of small solar assisted heat driven chillers, the application of such methodology has been extended to systems with a conventional compression chiller assisted by a photovoltaic plant (PV). This study aims to provide a comprehensive compared investigation of these two families of solar assisted cooling systems (with solar thermal or PV). Results indicate that, in many cases, the systems with the PV grid connected plant performed best. In addition, two more configurations were investigated to further define the PV assisted systems, which minimise their interaction with the grid through the use of electricity storages. These systems performed worse than the PV grid connected systems and the solar thermal assisted systems in nearly all the analysed cases. © 2013 Elsevier Ltd.

Muster-Slawitsch B.,Joanneum Research | Muster-Slawitsch B.,AEE - Institute of Sustainable Technologies | Weiss W.,AEE - Institute of Sustainable Technologies | Schnitzer H.,Joanneum Research | And 2 more authors.
Applied Thermal Engineering | Year: 2011

The aim of the Green Brewery Concept is to demonstrate the potential for reducing thermal energy consumption in breweries, to substantially lower fossil CO2 emissions and to develop an expert tool in order to provide a strategic approach to reach this reduction. Within the project "Green Brewery" three detailed case studies have been performed and a Green Brewery Concept has been developed. The project outcomes show that it is preferable to develop a tool instead of a simple guideline where a pathway to a CO2 neutral thermal energy supply is shown for different circumstances. The methodology of the Green Brewery Concept includes detailed energy balancing, calculation of minimal thermal energy demand, process optimization, heat integration and finally the integration of renewable energy based on exergetic considerations. For the studied breweries, one brewery with optimized heat recovery can potentially supply its thermal energy demand over own resources (excluding space heating). The energy produced from biogas from biogenic residues of breweries and waste water exceeds the remaining thermal process energy demand of 37 MJ/hl produced beer. © 2011 Elsevier Ltd. All rights reserved.

Hofler K.,AEE - Institute of Sustainable Technologies | Venus D.,AEE - Institute of Sustainable Technologies
Energy Procedia | Year: 2015

Renovating the European building stock shows high potential for energy and greenhouse gas reductions. Thereby the optimum balance between energy conservation or efficiency measures and renewable energy generation on-site has to be found, regarding the primary energy and carbon emissions reductions as well as the renovation costs. The whole life cycle of the building has to be considered and therefore Life Cycle Cost (LCC) calculations and Life Cycle Assessment (LCA) are of importance. This paper shows some results to these issues and was prepared within the frame of the IEA EBC Annex 56 research project [1]. © 2015 Published by Elsevier Ltd.

Hofler K.,AEE - Institute of Sustainable Technologies | Knotzer A.,AEE - Institute of Sustainable Technologies | Venus D.,AEE - Institute of Sustainable Technologies
Advances in Building Energy Research | Year: 2015

The high-performance renovation of the thermal envelope with prefabricated façade modules and with prefabricated modules for the building services represents a sustainable alternative to the established composite heat insulation system. In the frame of an Austrian research project(e80^3-Buildings – renovation concepts towards plus-energy building standard with prefabricated active roof and facade elements, integrated building services and grid integration; funded by the Federal Ministry for Transport, Innovation and Technology in the frame of the ‘building of tomorrow plus’ program; retrieved March 27, 2014, from, the boundary conditions and the energy concept for a plus-energy building were developed. Furthermore, prototypes of prefabricated insulated façade modules and modules for the building services were planned, constructed and tested and afterwards implemented in an Austrian demonstration project. A comprehensive monitoring of the residential building is performed and quality assurance of the concepts and the implementation is introduced. © 2014, Taylor & Francis.

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