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Daylight utilization significantly contributes to energy savings in office buildings. However, daylight integration requires careful design so as to include variations in daylight availability and maintain a balance between factors such as lighting quality and heat gain or loss. Designers with proper planning can not only improve the visual environment and create higher-quality spaces, but simultaneously minimize energy costs for buildings. The utilization of photosensors can exploit the benefits of daylighting by dimming the lighting system, so that no excessive luminous flux is produced, thus leading to energy savings as well as visual contentment. However, the human factor is crucial for the proper function of a lighting control system. Without its acceptance from the users, energy savings can be minimized or even negligible. The objective of this paper is to present a post-occupancy evaluation regarding occupant satisfaction and acceptance in relation to daylighting in offices equipped with automated daylight controls. In addition, the response of the users was compared with lighting measurements that were performed during the post-occupancy evaluation. Three case studies of office buildings with installed daylight-harvesting systems were examined. The age of the occupants was a crucial factor concerning their satisfaction in relation to the lighting levels. Aged users were more comfortable with lighting levels over 500lx, while young users were satisfied with 300lx. The impact of different control algorithms was outlined, with the integral reset algorithm performing poorly. The acceptance of the users for the closed loop systems maintained the expected energy savings of the daylight harvesting technique. Most of the occupants preferred to use daylight as a light source combined with artificial light but having the control to either override or switch it on and off at will. The results shown that a post-occupancy survey along with lighting measurements are significant for making an office environment a humancentric one.
Lambros T. Doulos; Aris Tsangrassoulis; Evangelos-Nikolaos Madias; Spyros Niavis; Antonios Kontadakis; Panagiotis A. Kontaxis; Vassiliki T. Kontargyri; Katerina Skalkou; Frangiskos Topalis; Evangelos Manolis; Maro Sinou; Stelios Zerefos. Examining the Impact of Daylighting and the Corresponding Lighting Controls to the Users of Office Buildings. Energies 2020, 13, 4024 .
AMA StyleLambros T. Doulos, Aris Tsangrassoulis, Evangelos-Nikolaos Madias, Spyros Niavis, Antonios Kontadakis, Panagiotis A. Kontaxis, Vassiliki T. Kontargyri, Katerina Skalkou, Frangiskos Topalis, Evangelos Manolis, Maro Sinou, Stelios Zerefos. Examining the Impact of Daylighting and the Corresponding Lighting Controls to the Users of Office Buildings. Energies. 2020; 13 (15):4024.
Chicago/Turabian StyleLambros T. Doulos; Aris Tsangrassoulis; Evangelos-Nikolaos Madias; Spyros Niavis; Antonios Kontadakis; Panagiotis A. Kontaxis; Vassiliki T. Kontargyri; Katerina Skalkou; Frangiskos Topalis; Evangelos Manolis; Maro Sinou; Stelios Zerefos. 2020. "Examining the Impact of Daylighting and the Corresponding Lighting Controls to the Users of Office Buildings." Energies 13, no. 15: 4024.
The scope of the present paper is to promote social, cultural and environmental sustainability in cities by establishing a conceptual framework and the relationship amongst safety in urban public space (UPS), lighting and Information and Communication Technology (ICT)-based surveillance. This framework uses available technologies and tools, as these can be found in urban equipment such as lighting posts, to enhance security and safety in UPS, ensuring protection against attempted criminal activity. Through detailed literary research, publications on security and safety concerning crime and lighting can be divided into two periods, the first one pre-1994, and the second one from 2004–2008. Since then, a significant reduction in the number of publications dealing with lighting and crime is observed, while at the same time, the urban nightscape has been reshaped with the immersion of light-emitting diode (LED) technologies. Especially in the last decade, where most municipalities in the EU28 (European Union of all the member states from the accession of Croatia in 2013 to the withdrawal of the United Kingdom in 2020) are refurbishing their road lighting with LED technology and the consideration of smart networks and surveillance is under development, the use of lighting to deter possible attempted felonies in UPS is not addressed. To capitalize on the potential of lighting as a deterrent, this paper proposes a framework that uses existing technology, namely, dimmable LED light sources, presence sensors, security cameras, as well as emerging techniques such as artificial intelligence (AI)-enabled image recognition algorithms and big data analytics and presents a possible system that could be developed as a stand-alone product to alert possible dangerous situations, deter criminal activity and promote the perception of safety thus linking lighting and ICT-based surveillance towards safety and security in UPS.
Maria Vogiatzaki; Stelios Zerefos; Marzia Hoque Tania. Enhancing City Sustainability through Smart Technologies: A Framework for Automatic Pre-Emptive Action to Promote Safety and Security Using Lighting and ICT-Based Surveillance. Sustainability 2020, 12, 6142 .
AMA StyleMaria Vogiatzaki, Stelios Zerefos, Marzia Hoque Tania. Enhancing City Sustainability through Smart Technologies: A Framework for Automatic Pre-Emptive Action to Promote Safety and Security Using Lighting and ICT-Based Surveillance. Sustainability. 2020; 12 (15):6142.
Chicago/Turabian StyleMaria Vogiatzaki; Stelios Zerefos; Marzia Hoque Tania. 2020. "Enhancing City Sustainability through Smart Technologies: A Framework for Automatic Pre-Emptive Action to Promote Safety and Security Using Lighting and ICT-Based Surveillance." Sustainability 12, no. 15: 6142.
The scope of the present paper is to promote social, cultural and environmental sustainability in cities by establishing a conceptual framework and the relationship amongst safety in urban public space (UPS), lighting and Information and Communication Technology (ICT)-based surveillance. This framework uses available technologies and tools, as these can be found in urban equipment such as lighting posts, to enhance security and safety in UPS, ensuring protection against attempted criminal activity. Through detailed literary research, publications on security and safety concerning crime and lighting can be divided into two periods, the first one pre-1994, and the second one from 2004–2008. Since then, a significant reduction in the number of publications dealing with lighting and crime is observed, while at the same time, the urban nightscape has been reshaped with the immersion of light-emitting diode (LED) technologies. Especially in the last decade, where most municipalities in the EU28 (European Union of all the member states from the accession of Croatia in 2013 to the withdrawal of the United Kingdom in 2020) are refurbishing their road lighting with LED technology and the consideration of smart networks and surveillance is under development, the use of lighting to deter possible attempted felonies in UPS is not addressed. To capitalize on the potential of lighting as a deterrent, this paper proposes a framework that uses existing technology, namely, dimmable LED light sources, presence sensors, security cameras, as well as emerging techniques such as artificial intelligence (AI)-enabled image recognition algorithms and big data analytics and presents a possible system that could be developed as a stand-alone product to alert possible dangerous situations, deter criminal activity and promote the perception of safety thus linking lighting and ICT-based surveillance towards safety and security in UPS.
Maria Vogiatzaki; Stelios Zerefos; Marzia Hoque Tania. Enhancing City Sustainability through Smart Technologies: A Framework for Automatic Pre-Emptive Action to Promote Safety and Security Using Lighting and ICT-Based Surveillance. 2020, 12, 1 .
AMA StyleMaria Vogiatzaki, Stelios Zerefos, Marzia Hoque Tania. Enhancing City Sustainability through Smart Technologies: A Framework for Automatic Pre-Emptive Action to Promote Safety and Security Using Lighting and ICT-Based Surveillance. . 2020; 12 (15):1.
Chicago/Turabian StyleMaria Vogiatzaki; Stelios Zerefos; Marzia Hoque Tania. 2020. "Enhancing City Sustainability through Smart Technologies: A Framework for Automatic Pre-Emptive Action to Promote Safety and Security Using Lighting and ICT-Based Surveillance." 12, no. 15: 1.
The scope of this paper is to identify the benefits of lamp recycling from the domestic sector. Data related to the recycled lamps was obtained from two recycling companies and were compared to those related to the waste lamps from the domestic sector. This was achieved by a new methodology which uses two alternative approaches. The first one is dependent on previous research data in relation to the number of active lamps while the second one elaborates on electricity consumption and sales data, in order to define the corresponding number of active lamps., The wasted amount of glass, metal and plastic is calculated along with the energy savings, the annual emissions of CO2-eq, the economic benefit from their sale and the potential reduction of hazardous waste, such as mercury to solid waste landfills under various scenarios. The amount of recovered materials collected by the Hellenic recycling companies contributes to a reduction of CO2-eq by 1298 tonnes, which falls significantly short of the CO2-eq that could have been saved 3108-5463tonnes if all the lamps were recycled. Furthermore, the recycling companies have an annual economic benefit of €32,251 which could be increased by €122,725 if all lamps were recycled together with the proper recycling of 3.4 kg of mercury, which was disposed in the environment. Finally, a future scenario was examined, in which all lamps in the domestic sector were assumed to be LEDs, an issue that can affect the viability of the recycling factories and it was proved that these might be affected.
C.J. Grigoropoulos; L.T. Doulos; Stelios Zerefos; A. Tsangrassoulis; P. Bhusal. Estimating the benefits of increasing the recycling rate of lamps from the domestic sector: Methodology, opportunities and case study. Waste Management 2020, 101, 188 -199.
AMA StyleC.J. Grigoropoulos, L.T. Doulos, Stelios Zerefos, A. Tsangrassoulis, P. Bhusal. Estimating the benefits of increasing the recycling rate of lamps from the domestic sector: Methodology, opportunities and case study. Waste Management. 2020; 101 ():188-199.
Chicago/Turabian StyleC.J. Grigoropoulos; L.T. Doulos; Stelios Zerefos; A. Tsangrassoulis; P. Bhusal. 2020. "Estimating the benefits of increasing the recycling rate of lamps from the domestic sector: Methodology, opportunities and case study." Waste Management 101, no. : 188-199.
This research discusses the feasibility of replacing or supporting artificial lighting with Transgenic Bioluminescent Plants (TBP), as a means of minimizing light pollution, reducing electrical energy consumption and de-carbonizing urban and suburban outdoor environments, creating sustainable conditions and enriching the quality of life. Until now, no information is given about the light output of any TBPs and the question “Are the TBPs capable of producing the necessary lighting levels for exterior lighting?” is unanswered. For this reason, a new methodology is proposed for selecting and analyzing the lighting output potential of transgenic plants ted for specific climatic conditions. This methodology considers growth and reduction factors, as well as a formulae for estimating the plants’ luminous output by performing light measurements. Results show that transgenic plants in medium growth can emit a median luminous flux of up to 57 lm, a value that can definitely support low lighting requirements when used in large numbers of plants. From the lighting measurements and calculations performed in this research, the light output of the TBPs for a typical road with 5m width was found equal to 2lx. The amount of plants required was 40 at each side of the road for every 30m of streets with P6 road class. The results show that the use of bioluminescent plants can actually contribute to the reduction of energy consumption, concerning only the lighting criterium, thus creating an enormous opportunity for a new state-of- the-art market and research that could potentially minimize CO2 emissions and light pollution, improve urban and suburban microclimate, mitigate the effects of climate change, as well as provide an alternative means of lighting affecting both outdoor lighting design and landscape planning in suburban and urban settings. Moreover, further research should be applied considering also other possible ecological impacts before applying TBPs for exterior lighting applications.
Olympia Ardavani; Stelios Zerefos; Lambros T. Doulos. Redesigning the exterior lighting as part of the urban landscape: The role of transgenic bioluminescent plants in mediterranean urban and suburban lighting environments. Journal of Cleaner Production 2019, 242, 118477 .
AMA StyleOlympia Ardavani, Stelios Zerefos, Lambros T. Doulos. Redesigning the exterior lighting as part of the urban landscape: The role of transgenic bioluminescent plants in mediterranean urban and suburban lighting environments. Journal of Cleaner Production. 2019; 242 ():118477.
Chicago/Turabian StyleOlympia Ardavani; Stelios Zerefos; Lambros T. Doulos. 2019. "Redesigning the exterior lighting as part of the urban landscape: The role of transgenic bioluminescent plants in mediterranean urban and suburban lighting environments." Journal of Cleaner Production 242, no. : 118477.
Stelios Zerefos; Theodora Antonakaki. Developing Studio Teaching Methodologies through Distance Learning in Lighting Design. The International Journal of Design Education 2019, 13, 1 .
AMA StyleStelios Zerefos, Theodora Antonakaki. Developing Studio Teaching Methodologies through Distance Learning in Lighting Design. The International Journal of Design Education. 2019; 13 (4):1.
Chicago/Turabian StyleStelios Zerefos; Theodora Antonakaki. 2019. "Developing Studio Teaching Methodologies through Distance Learning in Lighting Design." The International Journal of Design Education 13, no. 4: 1.
Thanos Balafoutis; Stelios Zerefos. Developing a Toolset for Decision-Making on the Design of Lighting for Historical Buildings. The International Journal of Architectonic, Spatial, and Environmental Design 2018, 12, 1 .
AMA StyleThanos Balafoutis, Stelios Zerefos. Developing a Toolset for Decision-Making on the Design of Lighting for Historical Buildings. The International Journal of Architectonic, Spatial, and Environmental Design. 2018; 12 (2):1.
Chicago/Turabian StyleThanos Balafoutis; Stelios Zerefos. 2018. "Developing a Toolset for Decision-Making on the Design of Lighting for Historical Buildings." The International Journal of Architectonic, Spatial, and Environmental Design 12, no. 2: 1.
Light shelves have been discussed in numerous studies as suitable solutions for controlling daylight in side-lit spaces. It is a system that can be easily modified, offering a range of design solutions. It can be easily mounted on the exterior and/or the interior of a vertical opening, it can come in various shapes from static flat forms to curved reflective surfaces, or it can even be actively controlled. A light shelf can offer shading and at the same time can redirect a significant part of the incoming light flux towards the ceiling improving daylight uniformity. Due to the aforesaid functions, light shelves are among the most popular system design solutions when it comes to daylight exploitation. The purpose of this paper is twofold. Firstly, to present the main research findings in relation to light shelves as daylighting systems and secondly to analyze the results, trying to establish a common basis for some efficient and practical design rules. The present paper is a review of the research realized in the last three decades concerning these systems together with their associated implications in a building’s daylight performance as well as in its energy balance in a few cases. In addition, the critical review of their design principles is included, which makes the presented information useful for design teams trying to select the optimal available system for any specific project.
Antonis Kontadakis; Aris Tsangrassoulis; Lambros Doulos; Stelios Zerefos. A Review of Light Shelf Designs for Daylit Environments. Sustainability 2017, 10, 71 .
AMA StyleAntonis Kontadakis, Aris Tsangrassoulis, Lambros Doulos, Stelios Zerefos. A Review of Light Shelf Designs for Daylit Environments. Sustainability. 2017; 10 (2):71.
Chicago/Turabian StyleAntonis Kontadakis; Aris Tsangrassoulis; Lambros Doulos; Stelios Zerefos. 2017. "A Review of Light Shelf Designs for Daylit Environments." Sustainability 10, no. 2: 71.
Normally, households comprise of people and their material possessions, where persons exercise exclusive agency. The digital augmentation of domestic environment transforms the constitution of households, populating them with new types of entities, namely connected and ‘smart’ objects/devices and distributed services. These new “players” operating within the household, are complex in nature, responsive, adaptive, blurring the given distinction between household members and their stuff, and evading a simplified classification. We consider the augmented home environment as an ecosystem which humans occupy among other interacting entities or parties which are actively affiliated to other networks and environments. Starting with the premise that a household inventory is one way to formally describe and define the household, we examine the contents and structure of traditional home inventories, and then elaborate on the potential evolution of the augmented home inventories as new types of interacting entities are introduced. Thus, we observe a shift from static and place-bound to dynamic classifications, allowing for diverse groupings of home-stuff. We contemplate on the possibility of integrating all parts of the household ecosystem into one unified classification and ontological system. We, also, acknowledge that the exponential growth of IoT will put increasing pressure for managing the huge volumes of data generated from connected households, on which an effective, meaningful, and socially compatible classification system is required. Finally, we highlight several challenges to the augmented home inventory.
Konstantinos Grivas; Stelios Zerefos. Augmented Home Inventories. Computer Vision 2015, 34 -47.
AMA StyleKonstantinos Grivas, Stelios Zerefos. Augmented Home Inventories. Computer Vision. 2015; ():34-47.
Chicago/Turabian StyleKonstantinos Grivas; Stelios Zerefos. 2015. "Augmented Home Inventories." Computer Vision , no. : 34-47.
The task of making the spectrum of home network connections visible in its entirety and details is a necessary first step towards a renewed understanding of home and domestic life as well as of the technical systems that underpin it. This paper proposes the categorization of pervasive interactions that take place in contemporary living spaces through certain criteria and tries to map them into the predefined spaces of today’s home, by creating a basic visualization tool. The research concludes with an example of a “composite map” that shows all the interlinked interactions that take place in a contemporary home. This map can become a potential tool for further research in the fields of the structure, behaviour and countenance of home networks, of advances in intimate media, applications and networked devices, and of augmented architectural spaces that interact with complex and pervasive communication networks.
Konstantinos Grivas; Stelios Zerefos. The Map as a Tool for Identifying Pervasive Interactions in Today’s Home. Transactions on Petri Nets and Other Models of Concurrency XV 2015, 36 -48.
AMA StyleKonstantinos Grivas, Stelios Zerefos. The Map as a Tool for Identifying Pervasive Interactions in Today’s Home. Transactions on Petri Nets and Other Models of Concurrency XV. 2015; ():36-48.
Chicago/Turabian StyleKonstantinos Grivas; Stelios Zerefos. 2015. "The Map as a Tool for Identifying Pervasive Interactions in Today’s Home." Transactions on Petri Nets and Other Models of Concurrency XV , no. : 36-48.
This survey paper addresses the representation of complex networks in an augmented home environment. The internal and external connections made by wirelessly connected devices, remain unseen, undermining the ability to perceive home in its totality. In order to help reveal the structure, form and perplexity of an augmented home environment, we elaborate on appropriate ways to represent visually those complex relations by making a survey of existing practices and models of complex spatial, territorial and networking visualisations. The survey examines the typologies and functionalities of complex network visualisations, currently available, as a source for basing hybrid home-network maps. It also considers that established mapping and visualisation practices which territorialise information and adjust to cognitive mapping provide equally useful references. Factors like projection, orientation, scale and graphic language have to be adjusted to 'home use/rs'. Finally, the immersive viewpoint is analysed as a complementary visualisation tool for augmented home environments.
Konstantinos Grivas; Stelios Zerefos. Issues on visual representation of hybrid home environments: survey of strategies and models. International Journal of Intelligent Engineering Informatics 2015, 3, 244 .
AMA StyleKonstantinos Grivas, Stelios Zerefos. Issues on visual representation of hybrid home environments: survey of strategies and models. International Journal of Intelligent Engineering Informatics. 2015; 3 (2/3):244.
Chicago/Turabian StyleKonstantinos Grivas; Stelios Zerefos. 2015. "Issues on visual representation of hybrid home environments: survey of strategies and models." International Journal of Intelligent Engineering Informatics 3, no. 2/3: 244.
We examine sunsets painted by famous artists as proxy information for the aerosol optical depth after major volcanic eruptions. Images derived from precision colour protocols applied to the paintings were compared to online images, and found that the latter, previously analysed, provide accurate information. Aerosol optical depths (AODs) at 550 nm, corresponding to Northern Hemisphere middle latitudes, calculated by introducing red-to-green (R / G) ratios from a large number of paintings to a radiative transfer model, were significantly correlated with independent proxies from stratospheric AOD and optical extinction data, the dust veil index, and ice core volcanic indices. AODs calculated from paintings were grouped into 50-year intervals from 1500 to 2000. The year of each eruption and the 3 following years were defined as "volcanic". The remaining "non-volcanic" years were used to provide additional evidence of a multidecadal increase in the atmospheric optical depths during the industrial "revolution". The increase of AOD at 550 nm calculated from the paintings grows from 0.15 in the middle 19th century to about 0.20 by the end of the 20th century. To corroborate our findings, an experiment was designed in which a master painter/colourist painted successive sunsets during and after the passage of Saharan aerosols over the island of Hydra in Greece. Independent solar radiometric measurements confirmed that the master colourist's R / G ratios which were used to model his AODs, matched the AOD values measured in situ by co-located sun photometers during the declining phase of the Saharan aerosol. An independent experiment was performed to understand the difference between R / G ratios calculated from a typical volcanic aerosol and those measured from the mineral aerosol during the Hydra experiment. It was found that the differences in terms of R / G ratios were small, ranging between −2.6% and +1.6%. Also, when analysing different parts of cloudless skies of paintings following major volcanic eruptions, any structural differences seen in the paintings had not altered the results discussed above. However, a detailed study on all possible sources of uncertainties involved (such as the impact of clouds on R / G ratios) still needs to be studied. Because of the large number of paintings studied, we tentatively propose the conclusion that regardless of the school, red-to-green ratios from great masters can provide independent proxy AODs that correlate with widely accepted proxies and with independent measurements.
C. S. Zerefos; P. Tetsis; A. Kazantzidis; V. Amiridis; S. C. Zerefos; J. Luterbacher; K. Eleftheratos; E. Gerasopoulos; Stelios Kazadzis; A. Papayannis. Further evidence of important environmental information content in red-to-green ratios as depicted in paintings by great masters. Atmospheric Chemistry and Physics 2014, 14, 2987 -3015.
AMA StyleC. S. Zerefos, P. Tetsis, A. Kazantzidis, V. Amiridis, S. C. Zerefos, J. Luterbacher, K. Eleftheratos, E. Gerasopoulos, Stelios Kazadzis, A. Papayannis. Further evidence of important environmental information content in red-to-green ratios as depicted in paintings by great masters. Atmospheric Chemistry and Physics. 2014; 14 (6):2987-3015.
Chicago/Turabian StyleC. S. Zerefos; P. Tetsis; A. Kazantzidis; V. Amiridis; S. C. Zerefos; J. Luterbacher; K. Eleftheratos; E. Gerasopoulos; Stelios Kazadzis; A. Papayannis. 2014. "Further evidence of important environmental information content in red-to-green ratios as depicted in paintings by great masters." Atmospheric Chemistry and Physics 14, no. 6: 2987-3015.
This work focuses on the visualisation of interactions in a pervasive home environment. Home as a space and as an activity container is traditionally linked to the habitual acts of the inhabitants. However, the infiltration of wireless connectivity, throughout the home and external to it, suggests that, in contrast to the traditional notion of hominess, we as inhabitants do not have the means to perceive significant data connections that take place throughout our home. These connections may range from simple data transfer to sensing and decision making, all taking place around our home and unseen. To this end we have tried to find the means to represent these connections in a visual way, in order to provide a tool that will help to reveal the structure, form and perplexity of digital connections to the inhabitants of a pervasive home environment. The study concludes that in order to visualise all this data, maps have to be formed that include both the material and immaterial infrastructure of home, as well as the connection between them and the rest of the world. These maps are bound to have the characteristics of centralised, distributed and decentralised networks, rendering them as hybrid maps, depending on the type of information they deal with.
Konstantinos Grivas; Stelios Zerefos; Irene Mavrommati. Mapping Interactions in a Pervasive Home Environment. Transactions on Petri Nets and Other Models of Concurrency XV 2014, 25 -36.
AMA StyleKonstantinos Grivas, Stelios Zerefos, Irene Mavrommati. Mapping Interactions in a Pervasive Home Environment. Transactions on Petri Nets and Other Models of Concurrency XV. 2014; ():25-36.
Chicago/Turabian StyleKonstantinos Grivas; Stelios Zerefos; Irene Mavrommati. 2014. "Mapping Interactions in a Pervasive Home Environment." Transactions on Petri Nets and Other Models of Concurrency XV , no. : 25-36.
Heat island which is the most documented phenomenon of climatic change is related to the increase of urban temperatures compared to the suburban. Among the various urban heat island mitigation techniques, green and cool roofs are the most promising since they simultaneously contribute to buildings’ energy efficiency. The aim of the present paper is to study the mitigation potential of green and cool roofs by performing a comparative analysis under diverse boundary conditions defining their climatic, optical, thermal and hydrological conditions. The impact of cool roof’s thermal mass, insulation level and solar reflectance as well as the effect of green roofs’ irrigation rate and vegetation are examined. The parametric study is based on detailed simulation techniques coupled with a comparative presentation of the released integrated sensible heat for both technologies versus a conventional roof under various climatic conditions.
D. Kolokotsa; Matthaios Santamouris; Stelios Zerefos. Green and cool roofs’ urban heat island mitigation potential in European climates for office buildings under free floating conditions. Solar Energy 2013, 95, 118 -130.
AMA StyleD. Kolokotsa, Matthaios Santamouris, Stelios Zerefos. Green and cool roofs’ urban heat island mitigation potential in European climates for office buildings under free floating conditions. Solar Energy. 2013; 95 ():118-130.
Chicago/Turabian StyleD. Kolokotsa; Matthaios Santamouris; Stelios Zerefos. 2013. "Green and cool roofs’ urban heat island mitigation potential in European climates for office buildings under free floating conditions." Solar Energy 95, no. : 118-130.
Air temperatures in urban areas continue to increase because of the heat island phenomenon (UHI) and the undeniable warming of the lower atmosphere during the past few decades. The observed high ambient air temperatures intensify the energy demand in cities, deteriorate urban comfort conditions, endanger the vulnerable population and amplify pollution problems especially in regions with hot climatic conditions. The present paper analyses 40 years of hourly data series from nine meteorological stations in Greece in order to understand the impact of air temperature and relative humidity trends on the energy consumption of buildings. Using a typical office building, the analysis showed that for the period in question the heating load in the Greek building sector has decreased by about 1 kWh/m2 per decade, while the cooling load increased by about 5 kWh/m2 per decade. This phenomenon has major environmental, economic and social consequences, which will be amplified in the upcoming decades in view of the expected man-made climatic changes in this geographic area.
J. Kapsomenakis; D. Kolokotsa; T. Nikolaou; M. Santamouris; S.C. Zerefos. Forty years increase of the air ambient temperature in Greece: The impact on buildings. Energy Conversion and Management 2013, 74, 353 -365.
AMA StyleJ. Kapsomenakis, D. Kolokotsa, T. Nikolaou, M. Santamouris, S.C. Zerefos. Forty years increase of the air ambient temperature in Greece: The impact on buildings. Energy Conversion and Management. 2013; 74 ():353-365.
Chicago/Turabian StyleJ. Kapsomenakis; D. Kolokotsa; T. Nikolaou; M. Santamouris; S.C. Zerefos. 2013. "Forty years increase of the air ambient temperature in Greece: The impact on buildings." Energy Conversion and Management 74, no. : 353-365.
This paper examines the behaviour in energy consumption of buildings that have polygonal and prismatic envelopes and are located in Mediterranean climates. More specifically, it aims at studying the differences in energy consumption of these kinds of buildings compared to orthogonal building envelopes. For this purpose a contemporary building was chosen and modelled in two different versions, one being the original prismatic form and the other a model of the same building with right angles, however retaining all area and volume data of the original prismatic building. Calculations reveal that the prismatic formed building has lower solar gains compared to its orthogonal counterpart and consumes less energy in an annual cycle. The results show a mean annual energy consumption difference of 7.88% in favour of the prismatic building envelope. Also, depending on the orientation, the difference in annual energy needs has a range between 2.51% and 16.01%.
Stelios C. Zerefos; Christos A. Tessas; Anastasios M. Kotsiopoulos; Dimitra Founda; Angeliki Kokkini. The role of building form in energy consumption: The case of a prismatic building in Athens. Energy and Buildings 2012, 48, 97 -102.
AMA StyleStelios C. Zerefos, Christos A. Tessas, Anastasios M. Kotsiopoulos, Dimitra Founda, Angeliki Kokkini. The role of building form in energy consumption: The case of a prismatic building in Athens. Energy and Buildings. 2012; 48 ():97-102.
Chicago/Turabian StyleStelios C. Zerefos; Christos A. Tessas; Anastasios M. Kotsiopoulos; Dimitra Founda; Angeliki Kokkini. 2012. "The role of building form in energy consumption: The case of a prismatic building in Athens." Energy and Buildings 48, no. : 97-102.
This research focuses on projecting the energy demand of the building sector in Greece by calculating energy consumption, using output data from regional climate models up to 2100. More specifically, Greece was subdivided into 13 climatic zones after assessing climate model data taking into account climate change estimates for the period 2010–2100. These zones allow a detailed estimation of the effects of climate change in specific regions of the country, thus creating a database which is used to model the energy demand of the building sector in each zone. Through the use of building data from Eurostat and the European Centre for Environment, a set of three building typologies was created in relation to the building envelope, which corresponds to 85% of the building stock in Greece. These typologies were later appended to each of the 13 climatic zones and a simulation for their energy demand was calculated using climatic data from 3 distinct climatic scenarios. Results show that the energy demand for heating the building sector in Greece could decrease by about 50%, while the respective energy demand for cooling could increase by as much as 248% until 2100. These effects are more evident in the Southern part of the country.
D.A. Asimakopoulos; Matthaios Santamouris; I. Farrou; M. Laskari; M. Saliari; G. Zanis; G. Giannakidis; K. Tigas; J. Kapsomenakis; C. Douvis; Stelios Zerefos; T. Antonakaki; C. Giannakopoulos. Modelling the energy demand projection of the building sector in Greece in the 21st century. Energy and Buildings 2012, 49, 488 -498.
AMA StyleD.A. Asimakopoulos, Matthaios Santamouris, I. Farrou, M. Laskari, M. Saliari, G. Zanis, G. Giannakidis, K. Tigas, J. Kapsomenakis, C. Douvis, Stelios Zerefos, T. Antonakaki, C. Giannakopoulos. Modelling the energy demand projection of the building sector in Greece in the 21st century. Energy and Buildings. 2012; 49 ():488-498.
Chicago/Turabian StyleD.A. Asimakopoulos; Matthaios Santamouris; I. Farrou; M. Laskari; M. Saliari; G. Zanis; G. Giannakidis; K. Tigas; J. Kapsomenakis; C. Douvis; Stelios Zerefos; T. Antonakaki; C. Giannakopoulos. 2012. "Modelling the energy demand projection of the building sector in Greece in the 21st century." Energy and Buildings 49, no. : 488-498.
This paper compares the heating and cooling loads between a double skin façade and a single skin façade in different and contrasting climates. The thermal and lighting properties of both types of facades are calculated, based on the hypothesis of a virtual south facing office room. The results of the above calculations show that in climates with high sunshine duration, the difference in heating and cooling loads is less for a double skin façade in comparison to a single skin facade. This difference ranges from about 30% in the Mediterranean to about 40% in the Arabian peninsula in the case that the single skin building is not equipped with automatic shading devices, whereas in the case that both buildings have automatic shading devices the above percentages range from about 5.5% to 7.5%, respectively. The same difference in heating and cooling loads between the two types of facades is significantly reduced in colder Continental climates such as Moscow, as well as temperate climates such as London.
Stelios C. Zerefos. On the performance of double skin facades in different environmental conditions. International Journal of Sustainable Energy 2007, 26, 221 -229.
AMA StyleStelios C. Zerefos. On the performance of double skin facades in different environmental conditions. International Journal of Sustainable Energy. 2007; 26 (4):221-229.
Chicago/Turabian StyleStelios C. Zerefos. 2007. "On the performance of double skin facades in different environmental conditions." International Journal of Sustainable Energy 26, no. 4: 221-229.
Paintings created by famous artists, representing sunsets throughout the period 1500–1900, provide proxy information on the aerosol optical depth following major volcanic eruptions. This is supported by a statistically significant correlation coefficient (0.8) between the measured red-to-green ratios of a few hundred paintings and the dust veil index. A radiative transfer model was used to compile an independent time series of aerosol optical depth at 550 nm corresponding to Northern Hemisphere middle latitudes during the period 1500–1900. The estimated aerosol optical depths range from 0.05 for background aerosol conditions, to about 0.6 following the Tambora and Krakatau eruptions and cover a period practically outside of the instrumentation era.
C. S. Zerefos; V. T. Gerogiannis; Dimitris Balis; Stelios Zerefos; A. Kazantzidis. Atmospheric effects of volcanic eruptions as seen by famous artists and depicted in their paintings. Atmospheric Chemistry and Physics 2007, 7, 4027 -4042.
AMA StyleC. S. Zerefos, V. T. Gerogiannis, Dimitris Balis, Stelios Zerefos, A. Kazantzidis. Atmospheric effects of volcanic eruptions as seen by famous artists and depicted in their paintings. Atmospheric Chemistry and Physics. 2007; 7 (15):4027-4042.
Chicago/Turabian StyleC. S. Zerefos; V. T. Gerogiannis; Dimitris Balis; Stelios Zerefos; A. Kazantzidis. 2007. "Atmospheric effects of volcanic eruptions as seen by famous artists and depicted in their paintings." Atmospheric Chemistry and Physics 7, no. 15: 4027-4042.
The present paper deals with the energy performance, energy classification and rating and the global environmental quality of school buildings. A new energy classification technique based on intelligent clustering methodologies is proposed. Energy rating of school buildings provides specific information on their energy consumption and efficiency relative to the other buildings of similar nature and permits a better planning of interventions to improve its energy performance. The overall work reported in the present paper, is carried out in three phases. During the first phase energy consumption data have been collected through energy surveys performed in 320 schools in Greece. In the second phase an innovative energy rating scheme based on fuzzy clustering techniques has been developed, while in the third phase, 10 schools have been selected and detailed measurements of their energy efficiency and performance as well as of the global environmental quality have been performed using a specific experimental protocol. The proposed energy rating method has been applied while the main environmental and energy problems have been identified. The potential for energy and environmental improvements has been assessed.
M. Santamouris; G. Mihalakakou; P. Patargias; N. Gaitani; K. Sfakianaki; M. Papaglastra; C. Pavlou; P. Doukas; E. Primikiri; V. Geros; M.N. Assimakopoulos; R. Mitoula; S. Zerefos. Using intelligent clustering techniques to classify the energy performance of school buildings. Energy and Buildings 2007, 39, 45 -51.
AMA StyleM. Santamouris, G. Mihalakakou, P. Patargias, N. Gaitani, K. Sfakianaki, M. Papaglastra, C. Pavlou, P. Doukas, E. Primikiri, V. Geros, M.N. Assimakopoulos, R. Mitoula, S. Zerefos. Using intelligent clustering techniques to classify the energy performance of school buildings. Energy and Buildings. 2007; 39 (1):45-51.
Chicago/Turabian StyleM. Santamouris; G. Mihalakakou; P. Patargias; N. Gaitani; K. Sfakianaki; M. Papaglastra; C. Pavlou; P. Doukas; E. Primikiri; V. Geros; M.N. Assimakopoulos; R. Mitoula; S. Zerefos. 2007. "Using intelligent clustering techniques to classify the energy performance of school buildings." Energy and Buildings 39, no. 1: 45-51.