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The ceramic industry is a sector within process industry associated to a high energy intensity which is owe to the operation of thermal processes such as firing, drying, spray drying and boiling. These processes are associated to high thermal energy losses (waste heat). As such, the adoption of waste heat recovery (WHR) technologies and strategies may reveal as an excellent opportunity to improve the energy efficiency of ceramic plants by improving the operation of these thermal processes. In practice, such may be performed by applying principles of process integration through assessing the waste heat potential of all the plant material streams and furtherly elaborate a plan to use this waste heat in the several different processes. In this work, it will be assessed the energy efficiency improvement potential associated to the implementation of a WHR strategy in a case-study ceramic plant. Such is carried out by modelling and simulate the plant and the WHR strategy using the Modelica language. Through the simulation of the developed model the techno-economic assessment, it was possible to accomplish the viability of the conceptualized project, with 3508 MWh/year of energy savings corresponding to 0.2 years of payback time.
Miguel Castro Oliveira; Muriel Iten; Henrique A. Matos. Assessment of energy efficiency improvement in ceramic industry through waste heat recovery modelling. 13th International Symposium on Process Systems Engineering (PSE 2018) 2021, 50, 1653 -1658.
AMA StyleMiguel Castro Oliveira, Muriel Iten, Henrique A. Matos. Assessment of energy efficiency improvement in ceramic industry through waste heat recovery modelling. 13th International Symposium on Process Systems Engineering (PSE 2018). 2021; 50 ():1653-1658.
Chicago/Turabian StyleMiguel Castro Oliveira; Muriel Iten; Henrique A. Matos. 2021. "Assessment of energy efficiency improvement in ceramic industry through waste heat recovery modelling." 13th International Symposium on Process Systems Engineering (PSE 2018) 50, no. : 1653-1658.
The increase of industrial symbiosis (IS) activities around the world has strongly contributed to promote awareness among companies on the benefits of this business model and, consequently, their interest to apply/incorporate dedicated IS actions in their activities. In most cases, companies assume self-learning and ongoing approaches for the adaption of synergies, ignoring some fundamental aspects as the full spectrum of considerations regarding these processes. Unexpected barriers frequently appear during the implementation process and become hardly overcome due to incomplete systematic approaches and the lack of information. In this context, it is important to promote effective and sequential guidance procedures regarding IS implementation processes to support companies in their transition to full IS processes implementation. This paper aims to advance the synergy implementation emerging process, through the identification, promotion, and definition of the core steps to be considered in an IS implementation process. This study is based on a comprehensive perspective for the definition of contents to be considered in a step-by-step guideline that includes the different theoretical, technical, and strategic approaches for large-scale IS promotion. The main outputs of this paper are a final set of independent and sequential information clusters, their associated contents identification process, and a comprehensive description of the systematic approach used to support companies in the implementation of their pre-identified stages. The guideline methodology proposed in this study is an important support tool for companies, practitioners, and agents intending to initiate IS synergies implementation and also a strong contribution to the development of complementary guidance activities regarding IS implementation process.
João Azevedo; Juan Henriques; Marco Estrela; Rui Dias; Doroteya Vladimirova; Karen Miller; Muriel Iten. Guidelines for Industrial Symbiosis—a Systematic Approach for Content Definition and Practical Recommendations for Implementation. Circular Economy and Sustainability 2021, 1 -17.
AMA StyleJoão Azevedo, Juan Henriques, Marco Estrela, Rui Dias, Doroteya Vladimirova, Karen Miller, Muriel Iten. Guidelines for Industrial Symbiosis—a Systematic Approach for Content Definition and Practical Recommendations for Implementation. Circular Economy and Sustainability. 2021; ():1-17.
Chicago/Turabian StyleJoão Azevedo; Juan Henriques; Marco Estrela; Rui Dias; Doroteya Vladimirova; Karen Miller; Muriel Iten. 2021. "Guidelines for Industrial Symbiosis—a Systematic Approach for Content Definition and Practical Recommendations for Implementation." Circular Economy and Sustainability , no. : 1-17.
A successful and broad implementation of industrial symbiosis (IS) initiatives is highly related to stakeholder’s involvement and technical considerations on its process’ development. This paper presents a mixed research study (quantitative and qualitative) focusing on the development of a dedicated tool based on sequential modules’ that support companies in the assessment of their potential to develop and implement IS scenarios. The first module considers the identification and characterization of the economic activity of the company to support an IS contextualization analysis. The second module provides the evaluation of the company’s current state, allowing key intervention areas to be defined. The third module focuses on the assessment of the potential scenarios for synergies implementation based on an economic benefit comparison of different valorization scenarios regarding the available surplus or waste. Complementarily, a SWOT analysis for the identification of the internal strengths and weaknesses, the external opportunities and threats associated with the IS process implementation is presented. The final output compiles qualitative and quantitative results regarding each module. The presented tool is currently under validation at industrial case studies. The preliminary results show the high applicability of the proposed tool in order to support decision making processes on surpluses valorization scenarios selection.
João Azevedo; Inês Ferreira; Rui Dias; Cristina Ascenço; Bruno Magalhães; Juan Henriques; Muriel Iten; Fernando Cunha. Industrial Symbiosis Implementation Potential—An Applied Assessment Tool for Companies. Sustainability 2021, 13, 1420 .
AMA StyleJoão Azevedo, Inês Ferreira, Rui Dias, Cristina Ascenço, Bruno Magalhães, Juan Henriques, Muriel Iten, Fernando Cunha. Industrial Symbiosis Implementation Potential—An Applied Assessment Tool for Companies. Sustainability. 2021; 13 (3):1420.
Chicago/Turabian StyleJoão Azevedo; Inês Ferreira; Rui Dias; Cristina Ascenço; Bruno Magalhães; Juan Henriques; Muriel Iten; Fernando Cunha. 2021. "Industrial Symbiosis Implementation Potential—An Applied Assessment Tool for Companies." Sustainability 13, no. 3: 1420.
Food waste is a significant problem requiring appropriate disposal measures. Waste valorization via high-value component extraction is one of the most interesting solutions, as natural food additives are expected to be healthier and more sustainable than synthetic ones. Yet, the selection of the most adequate disposal option should take into account both the economic and environmental aspects. Thus, in this work the life cycle energy consumption and carbon emissions of the extraction of ergosterol from mushroom residues is assessed. To support the development of a natural ergosterol extraction process, a cradle-to-gate study was done, for a functional unit of 1 g of extract. Data was obtained from a lab-scale experimental unit, complemented with literature data and life cycle environmental data from EcoInvent V3.3. Both CED and IPCC 2013 methods were used. Results show that lyophilization, evaporation and ultrasound assisted extraction are the processes with the highest carbon emissions and primary energy. Moreover, electricity, which supports most processes, was shown to be a key hotspot for improvement. Thus, two alternative scenarios with electricity mix and source (local photovoltaic production) were considered. Results showed that local photovoltaic production can potentially reduce non-renewable primary energy by 77% and carbon emissions by 83%.
Helena Monteiro; Bruna Moura; Muriel Iten; Teresa M. Mata; António A. Martins. Life cycle energy and carbon emissions of ergosterol from mushroom residues. Energy Reports 2020, 6, 333 -339.
AMA StyleHelena Monteiro, Bruna Moura, Muriel Iten, Teresa M. Mata, António A. Martins. Life cycle energy and carbon emissions of ergosterol from mushroom residues. Energy Reports. 2020; 6 ():333-339.
Chicago/Turabian StyleHelena Monteiro; Bruna Moura; Muriel Iten; Teresa M. Mata; António A. Martins. 2020. "Life cycle energy and carbon emissions of ergosterol from mushroom residues." Energy Reports 6, no. : 333-339.
Thermal processes represent a considerable part of the total energy consumption in manufacturing industry, in sectors such as steel, aluminium, cement, ceramic and glass, among others. It can even be the predominant type of energy consumption in some sectors. High thermal energy processes are mostly associated to high thermal losses, (commonly denominated as waste heat), reinforcing the need for waste heat recovery (WHR) strategies. WHR has therefore been identified as a relevant solution to increase energy efficiency in industrial thermal applications, namely in energy intensive consumers. The ceramic sector is a clear example within the manufacturing industry mainly due to the fuel consumption required for the following processes: firing, drying and spray drying. This paper reviews studies on energy efficiency improvement measures including WHR practices applied to the ceramic sector. This focuses on technologies and strategies which have significant potential to promote energy savings and carbon emissions reduction. The measures have been grouped into three main categories: (i) equipment level; (ii) plant level; and (iii) outer plant level. Some examples include: (i) high efficiency burners; (ii) hot air recycling from kilns to other processes and installation of heat exchangers; and (iii) installation of gas turbine for combined heat and power (CHP). It is observed that energy efficiency solutions allow savings up to 50–60% in the case of high efficiency burners; 15% energy savings for hot air recycling solutions and 30% in the when gas turbines are considered for CHP. Limitations to the implementation of some measures have been identified such as the high investment costs associated, for instance, with certain heat exchangers as well as the corrosive nature of certain available exhaust heat.
Miguel Castro Oliveira; Muriel Iten; Pedro L. Cruz; Helena Monteiro. Review on Energy Efficiency Progresses, Technologies and Strategies in the Ceramic Sector Focusing on Waste Heat Recovery. Energies 2020, 13, 6096 .
AMA StyleMiguel Castro Oliveira, Muriel Iten, Pedro L. Cruz, Helena Monteiro. Review on Energy Efficiency Progresses, Technologies and Strategies in the Ceramic Sector Focusing on Waste Heat Recovery. Energies. 2020; 13 (22):6096.
Chicago/Turabian StyleMiguel Castro Oliveira; Muriel Iten; Pedro L. Cruz; Helena Monteiro. 2020. "Review on Energy Efficiency Progresses, Technologies and Strategies in the Ceramic Sector Focusing on Waste Heat Recovery." Energies 13, no. 22: 6096.
This paper presents and explores the different Earth Observation approaches and their contribution to the achievement of United Nations Sustainable Development Goals. A review on the Sustainable Development concept and its goals is presented followed by Earth Observation approaches relevant to this field, giving special attention to the contribution of Machine Learning methods and algorithms as well as their potential and capabilities to support the achievement of Sustainable Development Goals. Overall, it is observed that Earth Observation plays a key role in monitoring the Sustainable Development Goals given its cost-effectiveness pertaining to data acquisition on all scales and information richness. Despite the success of Machine Learning upon Earth Observation data analysis, it is observed that performance is heavily dependent on the ability to extract and synthesise characteristics from data. Hence, a deeper and effective analysis of the available data is required to identify the strongest features and, hence, the key factors pertaining to Sustainable Development. Overall, this research provides a deeper understanding on the relation between Sustainable Development, Earth Observation and Machine Learning, and how these can support the Sustainable Development of countries and the means to find their correlations. In pursuing the Sustainable Development Goals, given the relevance and growing amount of data generated through Earth Observation, it is concluded that there is an increased need for new methods and techniques strongly suggesting the use of new Machine Learning techniques.
Bruno Ferreira; Muriel Iten; Rui Silva. Monitoring sustainable development by means of earth observation data and machine learning: a review. Environmental Sciences Europe 2020, 32, 1 -17.
AMA StyleBruno Ferreira, Muriel Iten, Rui Silva. Monitoring sustainable development by means of earth observation data and machine learning: a review. Environmental Sciences Europe. 2020; 32 (1):1-17.
Chicago/Turabian StyleBruno Ferreira; Muriel Iten; Rui Silva. 2020. "Monitoring sustainable development by means of earth observation data and machine learning: a review." Environmental Sciences Europe 32, no. 1: 1-17.
To foster the implementation of Industrial Symbiosis, several support tools have been developed to facilitate the dissemination of Industrial Symbiosis (IS) and the engagement of stakeholders; the establishment of exchanges between companies, the so-called synergies; and the assessment of impacts and benefits. Despite this, it has been found that stakeholders still do not have a clear envisioning of the required steps to the technical implementation of synergies and there are no facilitating tools, such as methodologies, frameworks, modelling tools, and databases, among others, that aid to technically support decision-making of synergy implementation. Thus, the goal of this paper is to present a dedicated framework that provides a set of guidelines and defines a technical viability analysis to support the implementation of potential synergies, which can be used and replicated by any IS practitioner. It comprehends a methodological approach to assess the compliance of a given synergy opportunity; its characterization concerning the definition of the necessary intermediary steps for the technical implementation; and an assessment of the technical feasibility of the synergy. The implementation of the framework allowed the successful technical validation of the studied synergy opportunities, providing a final technical viability assessment that can support decision-making of technology selection and synergy implementation.
Rui Dias; João Azevedo; Inês Ferreira; Marco Estrela; Juan Henriques; Cristina Ascenço; Muriel Iten. Technical Viability Analysis of Industrial Synergies—An Applied Framework Perspective. Sustainability 2020, 12, 7720 .
AMA StyleRui Dias, João Azevedo, Inês Ferreira, Marco Estrela, Juan Henriques, Cristina Ascenço, Muriel Iten. Technical Viability Analysis of Industrial Synergies—An Applied Framework Perspective. Sustainability. 2020; 12 (18):7720.
Chicago/Turabian StyleRui Dias; João Azevedo; Inês Ferreira; Marco Estrela; Juan Henriques; Cristina Ascenço; Muriel Iten. 2020. "Technical Viability Analysis of Industrial Synergies—An Applied Framework Perspective." Sustainability 12, no. 18: 7720.
Numerical models allow the solving of dynamic and complex problems such as industrial processes. Reliable numerical models representing the unit operations and energy systems within plants can greatly increase the competitiveness of industries. Industrial plants besides the primary circuits related to the manufacturing processes, also include secondary circuits related to water circuits and commonly neglected as not being directly involved in the processes. Typical industrial water circuits (IWC) include: water cooling, gas washing circuits, water treatment, water transportation and quenching circuits. The OpenModelica environment allows users to perform modelling and simulation of processes in an accessible and open source way. There is however a lack of dedicated open source library including the variety of equipment and processes of typical IWC. Hence, this paper presents a library based on typical IWC and validated with real case studies from different industrial sectors. The validation has shown good agreements between the modelling and the real data and therefore applicable for a variety of applications such as: energy efficiency improvement, circuits design, equipment dimensioning, operational and maintenance conformity.
Miguel C. Oliveira; Muriel Iten. Modelling of industrial water circuits with a customised Modelica library. Applied Thermal Engineering 2019, 169, 114840 .
AMA StyleMiguel C. Oliveira, Muriel Iten. Modelling of industrial water circuits with a customised Modelica library. Applied Thermal Engineering. 2019; 169 ():114840.
Chicago/Turabian StyleMiguel C. Oliveira; Muriel Iten. 2019. "Modelling of industrial water circuits with a customised Modelica library." Applied Thermal Engineering 169, no. : 114840.
Portugal presented 1,46 million smokers in 2014, resultingin about 2220 tonnes of cigarette butts per year. Such waste generates several harmful consequences to environment and public health. In this alignment, the current study purposes the incorporation of this waste in ceramic material to minimize its impacts. Cigarret buts were incorporated in clay fired bricks (0%, 2,5% and 5% (w/w)) and tested regarding theircompreensive strength, water absortion and density The results achieved with the waste incoporation indicatedas expected that the main properties are reduced by the incorporation of cigarrette butts. Moreover, thereduction indry density implies a decrease of the claycontent shoiwing also that this waste has an interisting potential in the production of clay fired bricks.
M. Soares; N. Valério; Andre Ribeiro; A. Ferreira; R. Campos; J. Araújo; A. Mota; J. Carvalho; Cândida Vilarinho; Muriel Iten; R. Dias; J. Henriques; D. Pinheiro. Giving cigarettes a second life: The E-Tijolo project. Wastes: Solutions, Treatments and Opportunities III 2019, 561 -566.
AMA StyleM. Soares, N. Valério, Andre Ribeiro, A. Ferreira, R. Campos, J. Araújo, A. Mota, J. Carvalho, Cândida Vilarinho, Muriel Iten, R. Dias, J. Henriques, D. Pinheiro. Giving cigarettes a second life: The E-Tijolo project. Wastes: Solutions, Treatments and Opportunities III. 2019; ():561-566.
Chicago/Turabian StyleM. Soares; N. Valério; Andre Ribeiro; A. Ferreira; R. Campos; J. Araújo; A. Mota; J. Carvalho; Cândida Vilarinho; Muriel Iten; R. Dias; J. Henriques; D. Pinheiro. 2019. "Giving cigarettes a second life: The E-Tijolo project." Wastes: Solutions, Treatments and Opportunities III , no. : 561-566.
Waste heat recovery is key for the improvement of several industrial sectors. It has the potential to be used as an energy source and, therefore, to reduce the current industrial energy consumption. The ceramic industry, in particular, encompasses significant thermal processes (the firing and drying) which generate substantial waste heat. This work studies the potential of waste heat recovery solutions for a ceramic floor tile plant. Direct re-use of hot air streams from kiln cooling zones as kiln combustion air is considered, as well as its use as drying agent and combustion air in dryers. The proposed strategies achieve natural gas savings up to 33% in the plant, reducing fuel consumption by 25–29% in kilns, by 44% in a dryer, and avoiding fuel consumption in the other dryer. Moreover, the payback period of all these strategies has been estimated as 0.12 years, which proves the attractiveness of waste heat recovery.
Helena Monteiro; P.L. Cruz; Miguel Castro Oliveira; Muriel Iten. Technical and economical assessment of waste heat recovery on a ceramic industry. Wastes: Solutions, Treatments and Opportunities III 2019, 524 -530.
AMA StyleHelena Monteiro, P.L. Cruz, Miguel Castro Oliveira, Muriel Iten. Technical and economical assessment of waste heat recovery on a ceramic industry. Wastes: Solutions, Treatments and Opportunities III. 2019; ():524-530.
Chicago/Turabian StyleHelena Monteiro; P.L. Cruz; Miguel Castro Oliveira; Muriel Iten. 2019. "Technical and economical assessment of waste heat recovery on a ceramic industry." Wastes: Solutions, Treatments and Opportunities III , no. : 524-530.
Water–energy nexus has been recognized as an important and challenging issue, namely in industry. This is due to industry reforms, increasing demand, and climate change. This concept focuses on the link between energy and water infrastructure. Overall, there is limited understanding of the nature of this link, as it is assumed that water is not a threat to the energy sector or an influence of the electricity to the water resources. This work aims to present and evaluate case studies related to typical industrial water circuits. These circuits represent some of the most relevant industrial sectors in terms of water–energy nexus such as: steel industry, chemical industry, paper and pulp industry, and food industry. Moreover, these sectors also cover typical industrial water circuits, namely: cooling circuit, gas washing circuit, water treatment circuit, transportation circuit, and quenching circuit. The circuits have firstly been assembled in OpenModelica software considering the equipment and physical layout of each circuit. According to their actual operation conditions, the energy and water consumption have been estimated. Furthermore, water and energy efficiency improvement measures have been proposed and implemented into the assembled models. This enabled a techno-economic assessment based on the implementation of the improvement measures. In order to contextualise these results into the industrial trends, the achieved water and energy savings are projected into potential national and sectorial savings considering the current levels of water and energy demand for each sector.
Miguel C. Oliveira; Muriel Iten; Henrique A. Matos; Jochen Michels; Muriel Iten. Water–Energy Nexus in Typical Industrial Water Circuits. Water 2019, 11, 699 .
AMA StyleMiguel C. Oliveira, Muriel Iten, Henrique A. Matos, Jochen Michels, Muriel Iten. Water–Energy Nexus in Typical Industrial Water Circuits. Water. 2019; 11 (4):699.
Chicago/Turabian StyleMiguel C. Oliveira; Muriel Iten; Henrique A. Matos; Jochen Michels; Muriel Iten. 2019. "Water–Energy Nexus in Typical Industrial Water Circuits." Water 11, no. 4: 699.
Industrial water circuits (IWC) are frequently neglected as they are auxiliary circuits of industrial processes, leading to a missing awareness of their energy- and water-saving potential. Industrial sectors such as steel, chemicals, paper and food processing are notable in their water-related energy requirements. Improvement of energy efficiency in industrial processes saves resources and reduces manufacturing costs. The paper presents a cooling IWC of a steel wire processing plant in which steel billets are transformed into wire. The circuit was built in object-oriented language in OpenModelica and validated with real plant data. Several improvement measures have been identified and an optimisation methodology has been proposed. A techno-economic analysis has been carried out to estimate the energy savings and payback time for the proposed improvement measures. The suggested measures allow energy savings up to 29% in less than 3 years’ payback time and water consumption savings of approximately 7.5%.
Muriel Iten; Miguel Oliveira; Diogo Costa; Jochen Michels; Muriel Iten. Water and Energy Efficiency Improvement of Steel Wire Manufacturing by Circuit Modelling and Optimisation. Energies 2019, 12, 223 .
AMA StyleMuriel Iten, Miguel Oliveira, Diogo Costa, Jochen Michels, Muriel Iten. Water and Energy Efficiency Improvement of Steel Wire Manufacturing by Circuit Modelling and Optimisation. Energies. 2019; 12 (2):223.
Chicago/Turabian StyleMuriel Iten; Miguel Oliveira; Diogo Costa; Jochen Michels; Muriel Iten. 2019. "Water and Energy Efficiency Improvement of Steel Wire Manufacturing by Circuit Modelling and Optimisation." Energies 12, no. 2: 223.
Two computational fluid dynamics (CFD) models were developed for the simulation of an air- thermal energy storage (TES) unit. The TES unit was experimentally tested with air flowing over horizontal metallic panels filled with phase change material (PCM). The commercial PCM was characterised by differential scanning calorimetry (DSC), namely: phase change temperature range, specific heat and enthalpy values. These properties were coupled to the CFD models in order to setup the two most common methods for phase change problems: enthalpy and the effective heat capacity methods. Both models predicted the PCM temperature and air outlet temperature and were compared with the experimental results. The PCM temperature presented the major differences. The enthalpy method shows the phase change stage by a quasi-horizontal curve, appropriate for pure PCMs. However, most of the commercial PCMs are composed by different compounds and hence this is not linear during the phase change as presented by the experimental results. The smooth increase over the phase change was accurately predicted by the effective heat capacity method. For the air outlet temperature, both methods present good agreements with the experimental results. Hence, for analysis requiring particular attention on the PCM behaviour the effective heat capacity method is recommended.
Muriel Iten; Shuli Liu; Ashish Shukla. Experimental validation of an air-PCM storage unit comparing the effective heat capacity and enthalpy methods through CFD simulations. Energy 2018, 155, 495 -503.
AMA StyleMuriel Iten, Shuli Liu, Ashish Shukla. Experimental validation of an air-PCM storage unit comparing the effective heat capacity and enthalpy methods through CFD simulations. Energy. 2018; 155 ():495-503.
Chicago/Turabian StyleMuriel Iten; Shuli Liu; Ashish Shukla. 2018. "Experimental validation of an air-PCM storage unit comparing the effective heat capacity and enthalpy methods through CFD simulations." Energy 155, no. : 495-503.
Shuli Liu; Muriel Iten; Ashish Shukla. Numerical study on the performance of an air—Multiple PCMs unit for free cooling and ventilation. Energy and Buildings 2017, 151, 520 -533.
AMA StyleShuli Liu, Muriel Iten, Ashish Shukla. Numerical study on the performance of an air—Multiple PCMs unit for free cooling and ventilation. Energy and Buildings. 2017; 151 ():520-533.
Chicago/Turabian StyleShuli Liu; Muriel Iten; Ashish Shukla. 2017. "Numerical study on the performance of an air—Multiple PCMs unit for free cooling and ventilation." Energy and Buildings 151, no. : 520-533.
M. Iten; S. Liu; Ashish Shukla; P.D. Silva. Investigating the impact of C p -T values determined by DSC on the PCM-CFD model. Applied Thermal Engineering 2017, 117, 65 -75.
AMA StyleM. Iten, S. Liu, Ashish Shukla, P.D. Silva. Investigating the impact of C p -T values determined by DSC on the PCM-CFD model. Applied Thermal Engineering. 2017; 117 ():65-75.
Chicago/Turabian StyleM. Iten; S. Liu; Ashish Shukla; P.D. Silva. 2017. "Investigating the impact of C p -T values determined by DSC on the PCM-CFD model." Applied Thermal Engineering 117, no. : 65-75.
Project MOEEBIUS focus is the reduction of the gap between predicted and actual energy performances in buildings. This project will introduce a Holistic Energy Performance Optimization Framework with new tools and methodologies that enhance current building energy performance simulation tools and current modelling approaches. This strategy aims to deeply grasp and describe real-life building operation complexities and introduce continuous optimization of building energy performance in real-time or through retrofitting.
Rui Martins; Filipe Silva; Muriel Iten; Ricardo Rato; Muriel Iten. Find the Gap: Project MOEEBIUS, a Holistic Energy Performance Optimization Framework. Proceedings 2017, 1, 1102 .
AMA StyleRui Martins, Filipe Silva, Muriel Iten, Ricardo Rato, Muriel Iten. Find the Gap: Project MOEEBIUS, a Holistic Energy Performance Optimization Framework. Proceedings. 2017; 1 (7):1102.
Chicago/Turabian StyleRui Martins; Filipe Silva; Muriel Iten; Ricardo Rato; Muriel Iten. 2017. "Find the Gap: Project MOEEBIUS, a Holistic Energy Performance Optimization Framework." Proceedings 1, no. 7: 1102.
In the present research paper thermal performance of an air-phase change material (PCM) unit has been experimentally studied. The influences of the air inlet temperatures and velocities have been investigated on the charging/discharging time of the PCM panels, heating/cooling load and effectiveness over the phase transition. These parameters play a vital on determining thermal performance of an air-PCM unit. Air inlet temperatures of 34 °C, 36 °C and 38 °C and air inlet velocities of 0.6 m/s, 1.6 m/s and 2.5 m/s. have been studied. The increase of the air inlet velocity reduced the charging and discharging time, however not linearly. The time for the complete melting and solidification is substantially reduced when the velocity has been increased from 0.6 m/s to 1.6 m/s. The air inlet temperature has been proved to be most important factor affecting the discharging time. For lower air inlet velocity the cooling and heating loads achieve lower values but remain nearly constant over a longer period of time. The effectiveness reaches its highest values for the air inlet velocity of 0.6 m/s for the charging and discharging processes. It has been concluded that discharging time can be extended by reducing the air inlet velocity and making the technology more suitable for heating and cooling applications for the buildings. A simplified methodology is proposed for the analysis of the PCM charging and discharging process through the identification of the critical points as result of the heat transfer behaviour in the air- PCM unit.
Muriel Iten; Shuli Liu; Ashish Shukla. Experimental study on the thermal performance of air-PCM unit. Building and Environment 2016, 105, 128 -139.
AMA StyleMuriel Iten, Shuli Liu, Ashish Shukla. Experimental study on the thermal performance of air-PCM unit. Building and Environment. 2016; 105 ():128-139.
Chicago/Turabian StyleMuriel Iten; Shuli Liu; Ashish Shukla. 2016. "Experimental study on the thermal performance of air-PCM unit." Building and Environment 105, no. : 128-139.
Muriel Iten; Shuli Liu; Ashish Shukla. A review on the air-PCM-TES application for free cooling and heating in the buildings. Renewable and Sustainable Energy Reviews 2016, 61, 175 -186.
AMA StyleMuriel Iten, Shuli Liu, Ashish Shukla. A review on the air-PCM-TES application for free cooling and heating in the buildings. Renewable and Sustainable Energy Reviews. 2016; 61 ():175-186.
Chicago/Turabian StyleMuriel Iten; Shuli Liu; Ashish Shukla. 2016. "A review on the air-PCM-TES application for free cooling and heating in the buildings." Renewable and Sustainable Energy Reviews 61, no. : 175-186.
The proposed experimental work intends to analyse the thermal performance of a TES unit incorporated into a ventilation system under different working conditions. The influences of the air inlet temperature and velocity on the air outlet temperature and heat transfer rate were investigated The air inlet temperature used for the solidification of RT25 were 10°C, 12°C and 14°C and for the melting 34°C, 36°C and 38°C. The selected air inlet velocities were the same for the melting and solidification process: 0.5 m/s, 1.4 m/s and 2.5 m/s. The results suggest that an increase of the air inlet velocity reduces linearly the temperature difference between the air inlet and outlet for the solidification process of the RT25. Contrary, for the melting of the RT25, increasing the air inlet velocity does not reduce the temperature difference linearly, increasing the air inlet temperature furthermore from 36°C to 38°C did not affect the melting time. The air inlet temperature plays a significant role on the melting process, reducing linearly the air inlet and outlet temperature difference and the heat transfer rate, however does not influence the solidification process, similar air inlet and outlet temperature difference and the heat transfer rate were obtained for all condition.Thus, air inlet velocity and air inlet temperature have to be carefully balanced to optimize the whole running cycle of both melting and solidification processes
Muriel Iten; Shuli Liu. Experimental Study on the Performance of RT 25 to be Used as Ambient Energy Storage. Energy Procedia 2015, 70, 229 -240.
AMA StyleMuriel Iten, Shuli Liu. Experimental Study on the Performance of RT 25 to be Used as Ambient Energy Storage. Energy Procedia. 2015; 70 ():229-240.
Chicago/Turabian StyleMuriel Iten; Shuli Liu. 2015. "Experimental Study on the Performance of RT 25 to be Used as Ambient Energy Storage." Energy Procedia 70, no. : 229-240.
Ivan Zajic; Muriel Iten; Keith J Burnham. Modelling and data-based identification of heating element in continuous-time domain. Journal of Physics: Conference Series 2014, 570, 012003 .
AMA StyleIvan Zajic, Muriel Iten, Keith J Burnham. Modelling and data-based identification of heating element in continuous-time domain. Journal of Physics: Conference Series. 2014; 570 (1):012003.
Chicago/Turabian StyleIvan Zajic; Muriel Iten; Keith J Burnham. 2014. "Modelling and data-based identification of heating element in continuous-time domain." Journal of Physics: Conference Series 570, no. 1: 012003.