Energy upgrading of buildings. A holistic approach for the Natural History Museum of Crete, Greece

Katsaprakakis, Dimitris Al.; Georgila, Klairi; Zidianakis, Georgios; Michopoulos, Apostolos; Psarras, Nikolaos; Christakis, Dimitris G.; Condaxakis, Constantinos; Kanouras, Spyros

doi:10.1016/j.renene.2017.08.021

Cited by 22 publications

(16 citation statements)

References 30 publications

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“…The construction industry is mainly focused on different actions to promote innovative and sustainable solutions in new and existing buildings, emphasizing the building envelope [22][23][24], mainly the façades, which play a substantial role in the energy saving of the buildings [25][26][27][28][29]. Along this line, Halawa et al [30] presented a review addressing different options to optimize the performance of building façades in hot and humid climates, drawing attention to innovative solutions.…”

Section: Introductionmentioning

confidence: 99%

Experimental Validation of a Numerical Model of a Ventilated Façade with Horizontal and Vertical Open Joints

et al. 2019

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Commercial and residential building is one of the four major final energy consumption and end-use sectors. In this sector, cooling loads represent an important part of the energy consumption, and therefore, they must be minimized, improving the energy efficiency of buildings. Ventilated façades are one of the most widely used passive elements that are integrated into buildings, precisely with the aim of reducing these loads. This reduction is due to the airflow induced in the air cavity by the buoyancy forces, when the solar radiation heats the outer layer of the façade. In the open joint ventilated facades (OJVF), ventilation is attained through the open joints between the panels composing the outer layer. Despite the steadily growing research in the characterization of this type of system, few studies combine the numerical modelling of OJVF with experimental results for the assessment of the airflow in the ventilated cavities. This paper experimentally validates a numerical simulation model of an OJVF. Firstly, the façade performance has been experimentally assessed in a laboratory model determining the temperatures in the panels and air gap and measuring the flow field at the gap using particle image velocimetry (PIV) techniques. Secondly, a numerical model has been developed using advanced Computational Fluid Dynamics (CFD) simulation tools. Finally, an experimental validation of the numerical model has been done. Experimental and numerical results are compared in different planes inside the ventilated cavity. The discrete ordinates (DO) radiation model and the k-ε renormalisation group (RNG) turbulence model better adjust the simulated results to the experimental ones.

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Section: Introductionmentioning

confidence: 99%

Experimental Validation of a Numerical Model of a Ventilated Façade with Horizontal and Vertical Open Joints

et al. 2019

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“…Green roofs constitute an attractive passive measure originating from traditional architecture approaches [14,15]. In Mediterranean climates, green roofs in office buildings in Cyprus [16] and residential buildings in Catania, Sicily [17] were investigated.…”

Section: Reducing Energy Needs By Passive Measuresmentioning

confidence: 99%

Energy Performance of Buildings with Thermochromic Windows in Mediterranean Climates

Arnaoutakis

Katsaprakakis

2021

Energies

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This article presents comparative results on the energy performance of buildings in the Mediterranean. Many buildings in the Mediterranean exhibit low energy performance ranking. Thermochromic windows are able to improve the energy consumption by controlling the gains from sunlight. In this article, reference buildings in 15 cities around the Mediterranean are investigated. In this work, a dynamic building information modeling approach is utilized, relying on three-dimensional geometry of office buildings. Calculations of the energy demand based on computational simulations of each location were performed, for the estimation of heating and cooling loads. The presented study highlighted the need for high-resolution data for detailed simulation of thermochromic windows in buildings of Mediterranean cities. Temperature is one of the main climate parameters that affect the energy demand of buildings. However, the climate of Mediterranean cities nearby the sea may affect the energy demand. This was more pronounced in cities with arid Mediterranean climate with increased demand in air-conditioning during the summer months. On the other hand, cities with semi-arid Mediterranean climate exhibited relatively increased heating demand. With this parametric approach, the article indicates the energy saving potential of the proposed measures for each Mediterranean city. Finally, these measures can be complemented by overall building passive and active systems for higher energy reductions and increased comfort.

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“…The different U-factors presented for the same constructive elements of a building refer to different constructive synthesis of the same element at different parts of the building. For example, the NHMC building constitutes a synthesis of an old construction, set up with physical stone walls, and a new one, constructed with synthetic materials [37]. The scope of this article is to present and compare a series of passive and active measures introduced in these different building categories, currently of different energy performance ranks, located in a typical Mediterranean climate.…”

Section: Energy Consumption In the Examined Buildingsmentioning

confidence: 99%

“…The different U-factors presented for the same constructive elements of a building refer to different constructive synthesis of the same element at different parts of the building. For example, the NHMC building constitutes a synthesis of an old construction, set up with physical stone walls, and a new one, constructed with synthetic materials [37]. In Table 2, fundamental features regarding the size, the occupants, the thermal comfort conditions and the operation schedule of each examined building are presented.…”

Section: Energy Consumption In the Examined Buildingsmentioning

confidence: 99%

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Working on Buildings’ Energy Performance Upgrade in Mediterranean Climate

et al. 2020

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This article aims to present the results from studies on the energy performance upgrade of buildings and facilities located in Crete, Greece, in a typical Mediterranean climate. In Mediterranean islands, the most buildings remain uninsulated, classified in C or even lower energy performance rank. In this article four reference buildings and one sports facility are investigated: a residential building, a municipality building, a school building, a museum and the Pancretan Stadium. Detailed calculations based on the computational simulation of each examined facility were executed, giving accurate results on the heating and cooling loads, both for the existing conditions and after the integration of the proposed passive measures. Thorough dimensioning and energy calculations have been executed for specific active energy systems too, particularly proposed for each examined case. With this parametric approach, the article indicates the effect and the economic efficiency of the proposed active or passive measures for each examined facility, expressed with specific key performance indicators. The common conclusion for all investigated cases is the huge margin for energy saving, which can reach 65% with regard to the existing annual consumptions. The payback period of the introduced energy upgrade measures can be as low as 15 years.

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Energy upgrading of buildings. A holistic approach for the Natural History Museum of Crete, Greece

Cited by 22 publications

References 30 publications

Experimental Validation of a Numerical Model of a Ventilated Façade with Horizontal and Vertical Open Joints

Experimental Validation of a Numerical Model of a Ventilated Façade with Horizontal and Vertical Open Joints

Energy Performance of Buildings with Thermochromic Windows in Mediterranean Climates

Working on Buildings’ Energy Performance Upgrade in Mediterranean Climate

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