WSEAS transactions on environment and development, Dec 31, 2023
A sustainable power system will require an extensive reliance on renewable energy sources (RES). ... more A sustainable power system will require an extensive reliance on renewable energy sources (RES). Taking into account the fact that a significant share of RES has already been deployed, either on large or a small scale, today's most crucial issue is their further participation in an extensive and secure power generation expansion to cover the large future energy demand. Although there is the needed capacity of RES that could cover the corresponding demand, the current power system structure and operation emerge limitations, which hold back their further exploitation. The introduction of energy storage systems, such as pump storage and batteries can help the further exploitation of the needed RES by balancing the current load demand and the intermittent power flow of photovoltaics and wind turbines. This paper analyses a recently interconnected island power system operation, as a representative case study, and demonstrates benefits, such as CO2 emissions reduction, and obstacles emerged by ultra-high penetration of RES. This ultra-high share of RES is technically feasible, through strong interconnections and electricity storage systems.
This article is an open access article distributed under the terms and conditions of the Creative... more This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY
This article is an open access article distributed under the terms and conditions of the Creative... more This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY
This article is an open access article distributed under the terms and conditions of the Creative... more This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY
This article is an open access article distributed under the terms and conditions of the Creative... more This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY
This article is an open access article distributed under the terms and conditions of the Creative... more This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY
Technology Readiness Levels (TRLs) is a well-established and widely used approach for defining th... more Technology Readiness Levels (TRLs) is a well-established and widely used approach for defining the readiness of new technology. To this extent, it assesses technology maturity against specific benchmarks, ranging from 1 (concept) to 9 (market solution). Although this is a useful classification service, allowing us to establish a common language, there are cases where we find that this conceptual approach fails to adequately highlight the maturity of certain innovative endeavors and effectively steer their development to higher TR levels. We will present an empirical case where the TRL approach presented a critical shortcoming in highlighting the true and effective readiness of a specific technological development and could not suggest the next natural step in ascending the maturity ladder. We will seek to generalize for the case of co-creation at large, analyze why co-creation may be poorly serviced by the current TRL model and suggest an amendment that would allow the observed shor...
Building electric energy is characterized by a significant increase of its uses (e.g. vehicle cha... more Building electric energy is characterized by a significant increase of its uses (e.g. vehicle charging), a rapidly declining cost of all related data collection and a proliferation of smart grid concepts, including diverse and flexible electricity pricing schemes. Not surprisingly, an increased number of approaches have been proposed for its modeling and forecasting. In this work, we place our emphasis on three forecasting related issues. First, on the forecasting explainability, i.e. the ability to understand and explain to the user what shapes the forecast. To this extent we rely on concepts and approaches that are inherently explainable, such as the evolutionary approach of genetic programming (GP) and its associated symbolic expressions, as well as the so-called SHAP (SHapley Additive eXplanations) values, which is a well established model agnostic approach for explainability, especially in terms of feature importance. Second, we investigate the impact of the training timeframe ...
This paper presents a practical methodology to facilitate decision-making for the development of ... more This paper presents a practical methodology to facilitate decision-making for the development of a renewable energy community (REC) in the municipality of Hersonissos in Crete, Greece. The impact of energy sharing produced from renewables through direct or indirect citizen participation presents an enormous opportunity to strengthen energy democracy and to alleviate energy poverty. Triggered by the latter being amongst the most essential goals for implementing policies towards low-carbon economies at the local level, the current study presents a step-by-step methodology to facilitate decision-making for building a municipality-led REC. Initially, potential sites and alternative sittings of photovoltaic (PV) plants are explored for detecting the optimal installation with respect to technical and possible legislative restrictions. The best REC business model is then selected based on a SWOT analysis, complemented with a detailed techno-economic analysis of the foreseen investments. Ac...
Large sports centers are characterized by special energy demand profiles compared to other facili... more Large sports centers are characterized by special energy demand profiles compared to other facilities. The aim of this work is to assess the economic investment of photovoltaics (PVs) on a sport center microgrid using different charging methods and by efficiently exploiting the PV generation. The overall work is performed in the following three steps. The first step is the energy requirement analysis, the second focuses on a PEV charging strategy proposition in order to exploit the PV generation, grid electricity price, and Vehicle-to-Grid (V2G), and the third step is the net present value (NPV) analysis of the PV investment in the different scenarios. The simulations showed that the proposed charging strategy increases the NPV. In addition, the increment of PEV penetration rate leads to the maximization of the NPV. The energy and costs analysis are carried out for an application case in the Olympic Athletic Centre of Athens.
Anotace Weinertova Lada: Dyslexie od historie po soucasnost Bakalařska prace: Brno, Masarykova un... more Anotace Weinertova Lada: Dyslexie od historie po soucasnost Bakalařska prace: Brno, Masarykova univerzita, Katedra specialni pedagogiky 2008, 46s. Klicova slova: dyslexie, specificke poruchy uceni, ditě, diagnostika, reedukace, cteni, porucha, lehka mozkova dysfunkce, dědicnost Bakalařska prace se zabýva specifickými poruchami uceni. Jsou zde vymezeny zakladni pojmy, strucný přehled problematiky specifických poruch uceni, charakteristika jednotlivých poruch, jejich přiciny, diagnostika a reedukace. Podrobněji se prace zabýva dyslexii, jejim vývojem od historie po soucasnost, charakteristikou, diagnostikou a taktež reedukaci. Dale prace obsahuje kazuistiky, ve kterých jsou popsany konkretni připady děti se specifickými poruchami uceni.
Worldwide, buildings are one of the main energy consumers and the improvement of their energy per... more Worldwide, buildings are one of the main energy consumers and the improvement of their energy performance has attracted great interest and has been typically related to the optimisation, both design and operational, of Heating, Ventilation, and Air Conditioning (HVAC), lighting and DHW systems, to innovation in building materials, as well as to the integration of renewable technology in buildings. More recently, occupant behaviour has received increasing attention. Occupants’ interactions with the building systems influence their energy consumption in diverse ways. Their behaviour may affect energy use just as the systems and materials may do. Researchers identified and highlighted various aspects of this occupant behaviour and were gradually led to the conclusion that its effect might be worth investigating. This study has a twofold aim. First, to present a general conceptual framework to define, monitor and eventually change user behaviour in buildings. This framework is called “e...
Innovation through clustering has proven to work well in a range of industries and geographic reg... more Innovation through clustering has proven to work well in a range of industries and geographic regions. However, significant numbers of clusters fail, especially in the Greek construction industry. It appears that certain critical success factors are required, raising the need for research to better understand how the critical success factors’ influence innovation. For this paper an interesting and challenging innovation context is selected, namely the Greek construction sector, that represents a fusion of small organisation size, brutal economic climate and an array of attitudes towards innovation. Through a questionnaire with 92 managers and ten in-depth interviews, the findings indicate that the Greek construction sector is mainly comprised of micro firms and that the perceived CSFs for implementing innovation clusters is significantly different from those identified in the literature. The responses from the firms raise interesting perspectives and questions whether innovation thr...
The idea of increasing regional and national economic competitiveness through the implementation ... more The idea of increasing regional and national economic competitiveness through the implementation of cluster strategies is not something new. In each business sector, in each country, the creation of clusters has been used to capitalise on sector characteristics and address country specific productivity needs. While clusters have met with significant success in many context, the Greek context and in particularly the Greek Construction sector has not been so fruitful. This paper, through the development of a conceptual framework, questionnaires with 92 firms and interviews with 10 key firms, sought to investigate the critical success factors for the creation of a cluster within the challenging context of the Greek construction sector. Using evidence of good practice from other European countries facing similar challenges and the empirical data, the findings indicated a series of factors which firms could adopt, mitigate against or manage to help improve the potential success of the cl...
Innovation through clustering has proven to work well in a range of industries and geographic reg... more Innovation through clustering has proven to work well in a range of industries and geographic regions. However, significant numbers of clusters fail, especially in the Greek construction industry. It appears that certain critical success factors are required, raising the need for research to better understand how the critical success factors’ influence innovation. For this paper an interesting and challenging innovation context is selected, namely the Greek construction sector, that represents a fusion of small organisation size, brutal economic climate and an array of attitudes towards innovation. Through a questionnaire with 92 managers and ten in-depth interviews, the findings indicate that the Greek construction sector is mainly comprised of micro firms and that the perceived CSFs for implementing innovation clusters is significantly different from those identified in the literature. The responses from the firms raise interesting perspectives and questions whether innovation thr...
WSEAS transactions on environment and development, Dec 31, 2023
A sustainable power system will require an extensive reliance on renewable energy sources (RES). ... more A sustainable power system will require an extensive reliance on renewable energy sources (RES). Taking into account the fact that a significant share of RES has already been deployed, either on large or a small scale, today's most crucial issue is their further participation in an extensive and secure power generation expansion to cover the large future energy demand. Although there is the needed capacity of RES that could cover the corresponding demand, the current power system structure and operation emerge limitations, which hold back their further exploitation. The introduction of energy storage systems, such as pump storage and batteries can help the further exploitation of the needed RES by balancing the current load demand and the intermittent power flow of photovoltaics and wind turbines. This paper analyses a recently interconnected island power system operation, as a representative case study, and demonstrates benefits, such as CO2 emissions reduction, and obstacles emerged by ultra-high penetration of RES. This ultra-high share of RES is technically feasible, through strong interconnections and electricity storage systems.
This article is an open access article distributed under the terms and conditions of the Creative... more This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY
This article is an open access article distributed under the terms and conditions of the Creative... more This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY
This article is an open access article distributed under the terms and conditions of the Creative... more This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY
This article is an open access article distributed under the terms and conditions of the Creative... more This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY
This article is an open access article distributed under the terms and conditions of the Creative... more This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY
Technology Readiness Levels (TRLs) is a well-established and widely used approach for defining th... more Technology Readiness Levels (TRLs) is a well-established and widely used approach for defining the readiness of new technology. To this extent, it assesses technology maturity against specific benchmarks, ranging from 1 (concept) to 9 (market solution). Although this is a useful classification service, allowing us to establish a common language, there are cases where we find that this conceptual approach fails to adequately highlight the maturity of certain innovative endeavors and effectively steer their development to higher TR levels. We will present an empirical case where the TRL approach presented a critical shortcoming in highlighting the true and effective readiness of a specific technological development and could not suggest the next natural step in ascending the maturity ladder. We will seek to generalize for the case of co-creation at large, analyze why co-creation may be poorly serviced by the current TRL model and suggest an amendment that would allow the observed shor...
Building electric energy is characterized by a significant increase of its uses (e.g. vehicle cha... more Building electric energy is characterized by a significant increase of its uses (e.g. vehicle charging), a rapidly declining cost of all related data collection and a proliferation of smart grid concepts, including diverse and flexible electricity pricing schemes. Not surprisingly, an increased number of approaches have been proposed for its modeling and forecasting. In this work, we place our emphasis on three forecasting related issues. First, on the forecasting explainability, i.e. the ability to understand and explain to the user what shapes the forecast. To this extent we rely on concepts and approaches that are inherently explainable, such as the evolutionary approach of genetic programming (GP) and its associated symbolic expressions, as well as the so-called SHAP (SHapley Additive eXplanations) values, which is a well established model agnostic approach for explainability, especially in terms of feature importance. Second, we investigate the impact of the training timeframe ...
This paper presents a practical methodology to facilitate decision-making for the development of ... more This paper presents a practical methodology to facilitate decision-making for the development of a renewable energy community (REC) in the municipality of Hersonissos in Crete, Greece. The impact of energy sharing produced from renewables through direct or indirect citizen participation presents an enormous opportunity to strengthen energy democracy and to alleviate energy poverty. Triggered by the latter being amongst the most essential goals for implementing policies towards low-carbon economies at the local level, the current study presents a step-by-step methodology to facilitate decision-making for building a municipality-led REC. Initially, potential sites and alternative sittings of photovoltaic (PV) plants are explored for detecting the optimal installation with respect to technical and possible legislative restrictions. The best REC business model is then selected based on a SWOT analysis, complemented with a detailed techno-economic analysis of the foreseen investments. Ac...
Large sports centers are characterized by special energy demand profiles compared to other facili... more Large sports centers are characterized by special energy demand profiles compared to other facilities. The aim of this work is to assess the economic investment of photovoltaics (PVs) on a sport center microgrid using different charging methods and by efficiently exploiting the PV generation. The overall work is performed in the following three steps. The first step is the energy requirement analysis, the second focuses on a PEV charging strategy proposition in order to exploit the PV generation, grid electricity price, and Vehicle-to-Grid (V2G), and the third step is the net present value (NPV) analysis of the PV investment in the different scenarios. The simulations showed that the proposed charging strategy increases the NPV. In addition, the increment of PEV penetration rate leads to the maximization of the NPV. The energy and costs analysis are carried out for an application case in the Olympic Athletic Centre of Athens.
Anotace Weinertova Lada: Dyslexie od historie po soucasnost Bakalařska prace: Brno, Masarykova un... more Anotace Weinertova Lada: Dyslexie od historie po soucasnost Bakalařska prace: Brno, Masarykova univerzita, Katedra specialni pedagogiky 2008, 46s. Klicova slova: dyslexie, specificke poruchy uceni, ditě, diagnostika, reedukace, cteni, porucha, lehka mozkova dysfunkce, dědicnost Bakalařska prace se zabýva specifickými poruchami uceni. Jsou zde vymezeny zakladni pojmy, strucný přehled problematiky specifických poruch uceni, charakteristika jednotlivých poruch, jejich přiciny, diagnostika a reedukace. Podrobněji se prace zabýva dyslexii, jejim vývojem od historie po soucasnost, charakteristikou, diagnostikou a taktež reedukaci. Dale prace obsahuje kazuistiky, ve kterých jsou popsany konkretni připady děti se specifickými poruchami uceni.
Worldwide, buildings are one of the main energy consumers and the improvement of their energy per... more Worldwide, buildings are one of the main energy consumers and the improvement of their energy performance has attracted great interest and has been typically related to the optimisation, both design and operational, of Heating, Ventilation, and Air Conditioning (HVAC), lighting and DHW systems, to innovation in building materials, as well as to the integration of renewable technology in buildings. More recently, occupant behaviour has received increasing attention. Occupants’ interactions with the building systems influence their energy consumption in diverse ways. Their behaviour may affect energy use just as the systems and materials may do. Researchers identified and highlighted various aspects of this occupant behaviour and were gradually led to the conclusion that its effect might be worth investigating. This study has a twofold aim. First, to present a general conceptual framework to define, monitor and eventually change user behaviour in buildings. This framework is called “e...
Innovation through clustering has proven to work well in a range of industries and geographic reg... more Innovation through clustering has proven to work well in a range of industries and geographic regions. However, significant numbers of clusters fail, especially in the Greek construction industry. It appears that certain critical success factors are required, raising the need for research to better understand how the critical success factors’ influence innovation. For this paper an interesting and challenging innovation context is selected, namely the Greek construction sector, that represents a fusion of small organisation size, brutal economic climate and an array of attitudes towards innovation. Through a questionnaire with 92 managers and ten in-depth interviews, the findings indicate that the Greek construction sector is mainly comprised of micro firms and that the perceived CSFs for implementing innovation clusters is significantly different from those identified in the literature. The responses from the firms raise interesting perspectives and questions whether innovation thr...
The idea of increasing regional and national economic competitiveness through the implementation ... more The idea of increasing regional and national economic competitiveness through the implementation of cluster strategies is not something new. In each business sector, in each country, the creation of clusters has been used to capitalise on sector characteristics and address country specific productivity needs. While clusters have met with significant success in many context, the Greek context and in particularly the Greek Construction sector has not been so fruitful. This paper, through the development of a conceptual framework, questionnaires with 92 firms and interviews with 10 key firms, sought to investigate the critical success factors for the creation of a cluster within the challenging context of the Greek construction sector. Using evidence of good practice from other European countries facing similar challenges and the empirical data, the findings indicated a series of factors which firms could adopt, mitigate against or manage to help improve the potential success of the cl...
Innovation through clustering has proven to work well in a range of industries and geographic reg... more Innovation through clustering has proven to work well in a range of industries and geographic regions. However, significant numbers of clusters fail, especially in the Greek construction industry. It appears that certain critical success factors are required, raising the need for research to better understand how the critical success factors’ influence innovation. For this paper an interesting and challenging innovation context is selected, namely the Greek construction sector, that represents a fusion of small organisation size, brutal economic climate and an array of attitudes towards innovation. Through a questionnaire with 92 managers and ten in-depth interviews, the findings indicate that the Greek construction sector is mainly comprised of micro firms and that the perceived CSFs for implementing innovation clusters is significantly different from those identified in the literature. The responses from the firms raise interesting perspectives and questions whether innovation thr...
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