An assessment of energetic efficiency improvement of existing building envelopes in Italy

2008 ◽  
Vol 19 (6) ◽  
pp. 718-730 ◽  
Author(s):  
Silvia Brunoro
Author(s):  
Luciano PAREJO ALFONSO

LABURPENA: Lan honen helburua lurralde-antolamenduko eta hirigintza-antolamenduko politiken Estatuko markoa birsortzeko prozesuaren berri ematea da, bi ikuspuntu erabiliz: garapen jasangarriaren printzipioarena eta Europar Batasunean adostutako hirigintzako jarraibideek zehazten duten «hiri konpaktuarena». Horretarako, Lurzoruari buruzko maiatzaren 28ko 8/2007 Legeak eta haren 2008ko ekainaren 20ko testu bateginak emandako lehen pausotik hasi (ikuspegia hirien mundurako aldaketa erabakigarria) eta uztailaren 7ko 8/2013 Legearen bidez mundu hori sistemaren muinean erabat sartu arte iritsi gara. Horrenbestez, hirigintza-garapen jasangarriaren printzipioan inspiratuta dago. Egungo eraikin-parkearen birgaitzearen ikuspuntuaz gain, hiri-sare osoaren (eraikinak eta haien hirigintza-elementuak) berroneratzearen eta berritzearen ikuspuntuak ere erabili dira —erabatekoak alderdi sozioekonomikoak biltzen dituztelako—, eta eraginkortasun energetikoaren helburua aintzat hartu da. Ezin dugu ahaztu erdiko bilakaera, oraindik nahikoa izan ez den hiriaren leheneratzeak adierazten duena, ekonomia jasangarriari buruzko martxoaren 4kko 2/2011 Legearen eta uztailaren 7ko 8/2011 Errege Lege-Dekretuaren politika publikoen ondorioz egindakoa. RESUMEN: Este trabajo pretende dar noticia del proceso de refundación del marco estatal de las políticas de ordenación territorial y urbanística bajo el signo del principio de desarrollo sostenible y la orientación del modelo común europeo de «ciudad compacta», es decir, del determinado por las directrices acordadas en materia urbanística en el contexto de la UE. Y ello desde el primer paso dado por la Ley 8/2007, de 28 de mayo, de suelo, y su texto refundido de 20 de junio de 2008 (en un giro decisivo de la mirada hacia el mundo urbano), hasta la reciente plena incorporación de dicho mundo al núcleo del sistema por la Ley 8/2013, de 7 de julio, inspirada, por ello, en el principio de desarrollo urbano sostenible, desde el punto de vista no solo de la rehabilitación del parque de edificios existente, sino de la regeneración y renovación —en su caso integrales por incorporación de los aspectos socio-económicos— del entero tejido urbano (los edificios y sus elementos de urbanización), comprendiendo incluso el objetivo de la eficiencia energética. Sin olvidar la evolución intermedia representada por la recuperación, aún insuficiente, de la ciudad hecha como objeto de las políticas públicas primero en el contexto de la Ley 2/2011, de 4 de marzo, de economía sostenible, y luego en el Real Decreto-Ley de 8/2011, de 7 de julio. ABSTRACT: The present study seeks to inform about the refoundation of the state framework for the policies of territory and urban planning under the sign of the principle of sustainable development and the orientation of the common european model of «compact city», that is, that one that was established by the agreed guidelines regarding urban area within the EU context. And it does it from the first step taken by Act 8/2007 of 28th May of Land and its consolidated text from 20th June of 2008 (by a crucial change of direction in the look to the urban world) to the recent full incorporation of that world to the core of the system of Act 8/2013 from 7th July inspired in the principle of sustainable urban development from the point of view not only of the restoration of the existing building park but also of the regeneration and renovation —where relevant integral by the incorporation of socio-economic facets— of the whole urban fabric (buildings and theis elements of urbanization) even including the objective of energetic efficiency. And not forgetting the intermediate evolution which the recovery, although not sufficient, of the city as the object of public policies first in the context of Act 2/2011 of 4 de March regarding sustainable economy and then the Royal-Decree Law of 8/2011 from July 7th.


Energies ◽  
2020 ◽  
Vol 13 (10) ◽  
pp. 2489 ◽  
Author(s):  
Jitka Mohelníková ◽  
Miloslav Novotný ◽  
Pavla Mocová

Existing building stock represents potential for energy saving renovations. Energy savings and indoor climate comfort are key demands for sustainable building refurbishment. Especially in schools, indoor comfort is an extremely important issue. A case study of energy consumption in selected school buildings in temperate climatic conditions of Central Europe region was performed. The studied buildings are representatives of various school premises constructed throughout the last century. The evaluation was based on data analysis of energy audits. The goal was aimed at assessment of the school building envelopes and their influence on energy consumption. One of the studied schools was selected for detailed evaluation. The school classroom was monitored for indoor thermal and visual environments. The monitoring was performed to compare the current state and renovation scenarios. Results of the evaluation show that the school buildings are highly inefficient even if renovated. Indoor climate in classrooms is largely influenced by windows. Solar gains affect interior thermal stability and daylighting. Thermal insulation quality of building envelopes and efficient solar shading systems appear to be fundamental tasks of school renovation strategies.


Author(s):  
Charles So´stenes Assunc¸a˜o

This paper concerns the performance improvement study of three heat exchangers. The objective is to reduce the consumption of oxygen used to enrich the blown air into a Blast Furnace through the improvement of the energetic efficiency of these heat exchangers. A CFD (Computer Fluids Dynamics) model was developed in order to simulate the thermodynamic behavior of the fluids inside the heat exchangers. Some geometric modifications were simulated with the objective of change the combustion gases flow characteristics. The simulation showed a potential of energetic efficiency improvement of 15, 25%, which means an increase of 115°C in the outlet air temperature. The simulated modifications were implemented in one of three heat exchangers and the actual temperature increase was 135°C. After the implementation of the modifications in the others heat exchangers, the expected reduction of the oxygen consumption in the Blast Furnace is about 4.400.000 Nm3 per year.


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