scholarly journals Methodology for the Study of the Envelope Airtightness of Residential Buildings in Spain: A Case Study

Energies ◽  
2018 ◽  
Vol 11 (4) ◽  
pp. 704 ◽  
Author(s):  
Jesús Feijó-Muñoz ◽  
Irene Poza-Casado ◽  
Roberto Alonso González-Lezcano ◽  
Cristina Pardal ◽  
Víctor Echarri ◽  
...  
Keyword(s):  
Housing Stock ◽  
Residential Buildings ◽  
Energy Performance ◽  
Air Leakage ◽  
Mediterranean Countries ◽  
Relevant Variables ◽  
Ventilation Rates ◽  
Air Leakage Rate

Air leakage and its impact on the energy performance of dwellings has been broadly studied in countries with cold climates in Europe, US, and Canada. However, there is a lack of knowledge in this field in Mediterranean countries. Current Spanish building regulations establish ventilation rates based on ideal airtight envelopes, causing problems of over-ventilation and substantial energy losses. The aim of this paper is to develop a methodology that allows the characterization of the envelope of the housing stock in Spain in order to adjust ventilation rates taking into consideration air leakage. A methodology that is easily applicable to other countries that consider studying the airtightness of the envelope and its energetic behaviour improvement is proposed. A statistical sampling method has been established to determine the dwellings to be tested, considering relevant variables concerning airtightness: climate zone, year of construction, and typology. The air leakage rate is determined using a standardized building pressurization technique according to European Standard EN 13829. A representative case study has been presented as an example of the implementation of the designed methodology and results are compared to preliminary values obtained from the database.

scholarly journals Dependence of measured specific air leakage rate (qE50) on envelope pressure differences and measurement position: a case study in an apartment building in winter conditions

2021 ◽  
Vol 2069 (1) ◽  
pp. 012229
Author(s):  
P Klõšeiko ◽  
E Arumägi ◽  
J Hallik ◽  
T Kalamees
Keyword(s):  
Residential Building ◽  
Energy Performance ◽  
Building Envelope ◽  
Air Leakage ◽  
Apartment Building ◽  
Measurement Results ◽  
Air Leakage Rate ◽  
Random Nature ◽  
Airtightness Measurement

Abstract Airtightness of the building envelope has become an important component in achieving ever stricter energy performance levels. However, airtightness measurements using blower door method are dependent on choices made by the specialist conducting the tests. One being the assessment of baseline pressure difference inside the building and position of the measurement equipment. Ideally, the test will be conducted without wind and stack effect which could disturb the envelope pressure measurements. Unfortunately, such conditions seldom exist, especially in colder climates. This increases the appeal of conducting apartment-wise measurements over whole-building measurements as it is far easier to comply with the ISO 9972. However, the apartment-wise method has a relatively random nature due to small share of actual building envelope. This paper investigates the effect of using different measurement positions and pressure levels on the airtightness measurement results. A 5-storey 15m tall residential building was used as a case study and measured as a whole and in select apartments. The results show that the variation caused by different choices of pressure levels, measurement positions etc caused relatively low variations and whole-building measurement should be preferred even if not all baseline and pressure level requirements are not met.

scholarly journals Integrating GIS-Based Point of Interest and Community Boundary Datasets for Urban Building Energy Modeling

Energies ◽  
2021 ◽  
Vol 14 (4) ◽  
pp. 1049
Author(s):  
Zhang Deng ◽  
Yixing Chen ◽  
Xiao Pan ◽  
Zhiwen Peng ◽  
Jingjing Yang
Keyword(s):  
Large Scale ◽  
Residential Buildings ◽  
Building Energy ◽  
Energy Performance ◽  
Energy Modeling ◽  
Office Buildings ◽  
Building Energy Modeling ◽  
Downtown Area ◽  
Point Of Interest

Urban building energy modeling (UBEM) is arousing interest in building energy modeling, which requires a large building dataset as an input. Building use is a critical parameter to infer archetype buildings for UBEM. This paper presented a case study to determine building use for city-scale buildings by integrating the Geographic Information System (GIS) based point-of-interest (POI) and community boundary datasets. A total of 68,966 building footprints, 281,767 POI data, and 3367 community boundaries were collected for Changsha, China. The primary building use was determined when a building was inside a community boundary (i.e., hospital or residential boundary) or the building contained POI data with main attributes (i.e., hotel or office building). Clustering analysis was used to divide buildings into sub-types for better energy performance evaluation. The method successfully identified building uses for 47,428 buildings among 68,966 building footprints, including 34,401 residential buildings, 1039 office buildings, 141 shopping malls, and 932 hotels. A validation process was carried out for 7895 buildings in the downtown area, which showed an overall accuracy rate of 86%. A UBEM case study for 243 office buildings in the downtown area was developed with the information identified from the POI and community boundary datasets. The proposed building use determination method can be easily applied to other cities. We will integrate the historical aerial imagery to determine the year of construction for a large scale of buildings in the future.

scholarly journals Evaluación de la sostenibilidad en la rehabilitación energética de vivienda social en países mediterráneos = Evaluation of sustainability in the energy rehabilitation of social housing in Mediterranean countries

2018 ◽  
Vol 4 (2) ◽  
pp. 82
Author(s):  
B Gimeno ◽  
J. Aranda ◽  
D. Zambrana ◽  
A. Conserva ◽  
P. López ◽  
...  
Keyword(s):  
Co2 Emissions ◽  
Social Housing ◽  
Housing Stock ◽  
Rental Housing ◽  
The European Union ◽  
Mediterranean Countries ◽  
Use Stage ◽  
Useful Life ◽  
Electrical Consumption

Resumen En España, donde existen más de 18 millones de hogares según el último censo del Instituto Nacional de Estadística en 2011, alrededor del 8% de la población reside en viviendas de alquiler social. Del parque de viviendas español, más de la mitad de los edificios se construyeron antes de 1980 y alrededor del 35% entre 1981 y 2006, año en que fue implantado el Código Técnico de la Edificación. Asimismo, más del 80% de los certificados energéticos de edificios existentes registrados hasta julio de 2015, obtiene una calificación E o inferior en términos de emisiones de CO2. Para mejorar estos resultados, la Unión Europea tiene como objetivo alcanzar una tasa de rehabilitación de edificios privados del 2,5% anual, mejorando la eficiencia energética y ampliando la vida útil del parque edificatorio. Sin embargo, los CEEE únicamente representan parte de la etapa de uso, dejando atrás otras, como la de producción, cuyo impacto puede representar un cuarto de las emisiones de CO2 del edificio a lo largo de su ciclo de vida. Para desarrollar una rehabilitación óptima, se propone evaluar la sostenibilidad de los proyectos de rehabilitación incluyendo las etapas de producción, construcción, uso y fin de vida y considerando el impacto medioambiental y económico, así como aspectos sociales relativos a las características de la vivienda social. Este artículo analiza los impactos medioambientales de diferentes soluciones de rehabilitación en vivienda social, tomando como caso de estudio un edificio de vivienda social en Zaragoza. El edificio antes de la rehabilitación supone casi 50 kgCO2-eq/m2año, donde el 60% corresponden al consumo eléctrico durante la fase de uso del edificio. En el estudio también se incluye la variable de confort térmico en situaciones de vulnerabilidad energética. Abstract In Spain, where there are more than 18 million households according to the last census of the National Institute of Statistics in 2011, around 8% of the population lives in social rental housing. Of the Spanish housing stock, more than half of the buildings were built before 1980 and around 35% between 1981 and 2006, the year in which the Technical Building Code was implemented. Likewise, more than 80% of the energy certificates of existing buildings registered until July 2015, obtain an E rating or lower in terms of CO2 emissions. To improve these results, the European Union aims to achieve a private buildings rehabilitation rate of 2.5% per year, improving energy efficiency and extending the useful life of the building park. However, CEEEs only represent part of the use stage, leaving behind others, such as production, whose impact can represent a quarter of the building's CO2 emissions throughout its life cycle. To develop an optimal rehabilitation, it is proposed to evaluate the sustainability of the rehabilitation projects including the stages of production, construction, use and end of life and considering the environmental and economic impact, as well as social aspects related to the characteristics of social housing. This article analyzes the environmental impacts of different rehabilitation solutions in social housing, taking as a case study a social housing building in Zaragoza. The building before the rehabilitation supposes almost 50 kgCO2-eq / m2año, where 60% correspond to the electrical consumption during the phase of use of the building. The study also includes the thermal comfort variable in situations of energy vulnerability.

Assessment of energy performance using bottom-up method

2019 ◽  
Vol 38 (1) ◽  
pp. 192-216
Author(s):  
Khadidja El-Bahdja Djebbar ◽  
Souria Salem ◽  
Abderrahmane Mokhtari
Keyword(s):  
Urban Areas ◽  
Housing Stock ◽  
Residential Buildings ◽  
Energy Performance ◽  
Bottom Up ◽  
Content Type ◽  
Consumption Index ◽  
Physical Information ◽  
Thermal Simulations ◽  
Existing Housing

Purpose The purpose of this paper is to analyze energy performance of the multi-storey buildings built in the city of Tlemcen between 1872 and 2016. Design/methodology/approach A diagnosis based on a bottom-up methodology, using statistical techniques and engineering, has been developed and applied. To do this, demand condition analysis was conducted using a data collection survey on a sample of 100 case studies. Physical characteristics of the buildings have been determined through the archetype by period. This serves to define the strengths and weaknesses of buildings as energy consumers. Findings The obtained results showed that dwellings built between 1872 and 1920 offer better energy performance with a consumption index close to 130kWh/m2/year and this compared to the five periods considered. For dwellings built between 1974 and 1989, energy consumption is higher with an index approaching 300kWh/m2/year, thus qualifying the buildings of this period as energy intensive. Originality/value A database is established to collect physical information on the existing housing stock and thus allow their classification vis-à-vis of the energy label. This study is part of a research project aimed at evaluating and determining optimal measures for energy rehabilitation of multi-family buildings in Tlemcen. Thermal rehabilitation solutions are proposed using thermal simulations, in the following studies, to improve thermal performance of existing buildings. This study constitutes the first step of a roadmap applicable to other cities constituting climatic zones in Algeria. This helps to enrich the Algerian thermal regulation in thermal rehabilitation of existing residential buildings and conception of new ones, in urban areas with a similar climate.

scholarly journals Low Polluting Building Materials and Ventilation for Good Air Quality in Residential Buildings: A Cost–Benefit Study

Atmosphere ◽  
2020 ◽  
Vol 11 (1) ◽  
pp. 102 ◽  
Author(s):  
Francesco Babich ◽  
Ingrid Demanega ◽  
Francesca Avella ◽  
Annamaria Belleri
Keyword(s):  
Air Quality ◽  
Indoor Air ◽  
Building Materials ◽  
Cost Benefit Analysis ◽  
Residential Buildings ◽  
Cost Benefit ◽  
Capital Cost ◽  
Ventilation Rates

Nowadays, people spend an average of 87% of their time inside buildings, and about 69% at home. Hence, it is essential to ensure the highest possible level of indoor air quality (IAQ). Providing that the quality of the outdoor air is acceptable, the IAQ level is improved by increasing the ventilation rates. However, this means that a larger volume of air must be cooled down or warmed up to ensure the same level of thermal comfort. The aim of this study was to conduct a cost–benefit analysis of the IAQ in residential buildings. A case-study building was defined, and three sets of materials with different pollution emission levels were chosen: High, low, and very low. For each option, the ventilation rates required to have the same IAQ level were calculated, and the consequent energy consumption and costs were estimated by means of dynamic thermal simulation. The results show the range of the initial capital cost that could be compensated for by lower running costs, and the effect of each energy and economic input assumption on the appraisal of the affordable capital cost. In the discussion, insights into the IAQ co-benefits are also given.

scholarly journals The Application of Courtyard and Settlement Layouts of the Traditional Diyarbakır Houses to Contemporary Houses: A Case Study on the Analysis of Energy Performance

Energies ◽  
2020 ◽  
Vol 13 (3) ◽  
pp. 587 ◽  
Author(s):  
İdil Ayçam ◽  
Sevilay Akalp ◽  
Leyla Senem Görgülü
Keyword(s):  
Energy Efficient ◽  
Settlement Patterns ◽  
Residential Buildings ◽  
Vernacular Architecture ◽  
Building Design ◽  
Energy Performance ◽  
Housing Sector ◽  
Bioclimatic Design ◽  
Energy Consuming

Conventional energy use has brought environmental problems such as global warming and accelerated efforts to reduce energy consumption in many areas, particularly in the housing sector. For this purpose, bioclimatic design principles and vernacular architecture parameters have started to be examined in residential buildings nowadays. Thus, the demand for less energy-consuming houses has started to increase. In this study, we aimed to specify the significance of traditional architectural parameters for houses in the hot-dry climatic region of Diyarbakır, Turkey. Within the scope of the study, a case was based on the urban fabric of the traditional houses in Historical Diyarbakir Suriçi-Old Town settlement and the Şilbe Mass Housing Area was discussed. The courtyard types, settlement patterns, and street texture of traditional Diyarbakır houses were modeled by using DesignBuilder energy simulation program for the case study. Annual heating, cooling, and total energy loads were calculated, and their thermal performances were compared. The aim is to create a less energy-consuming and sustainable environment with the adaptation of traditional building form-street texture to today’s housing sector. Development of a settlement model, which is based on traditional houses’ bioclimatic design for hot-dry region, was intended to be applied in the modern housing sector of Turkey. Moreover, adapting local forms, urban texture, and settlement patterns to today has significant potential for sustainable architecture and energy-efficient buildings. According to this study, the optimum form and layout of traditional houses, which are one of the climate balanced building designs, provide annual energy savings if integrated and designed in today’s building construction. As a result of this study, if the passive design alternatives such as building shape, layout, and orientation were developed in the first stage of the design, energy efficient building design would be possible. The study is important for the continuation of traditional sustainable design.

Building typologies as a tool for assessing the energy performance of residential buildings – A case study for the Hellenic building stock

2011 ◽  
Vol 43 (12) ◽  
pp. 3400-3409 ◽  
Author(s):  
Elena G. Dascalaki ◽  
Kalliopi G. Droutsa ◽  
Constantinos A. Balaras ◽  
Simon Kontoyiannidis
Keyword(s):  
Residential Buildings ◽  
Energy Performance ◽  
Building Stock

ENHANCING THE DAYLIGHT AND ENERGY PERFORMANCE OF EXTERNAL SHADING DEVICES IN HIGH-RISE RESIDENTIAL BUILDINGS IN DENSE URBAN TROPICS

2021 ◽  
Vol 16 (3) ◽  
pp. 87-108
Author(s):  
Nadeeka Jayaweera ◽  
Upendra Rajapaksha ◽  
Inoka Manthilake
Keyword(s):  
Residential Buildings ◽  
Residential Building ◽  
Energy Performance ◽  
Simulation Software ◽  
Baseline Scenario ◽  
Building Model ◽  
High Rise ◽  
Lighting Energy ◽  
Shading Devices

ABSTRACT This study examines the daylight and energy performance of 27 external shading scenarios in a high-rise residential building in the urban tropics. The cooling energy, daytime lighting energy and the spatial daylight autonomy (sDA) of the building model were simulated in Rhino3D and Grasshopper simulation software. The best performance scenario (vertical and horizontal shading on the twentieth floor, horizontal shading only for the eleventh floor and no shading for the second floor) satisfied 75 sDA(300lx|50) with corresponding annual enery performance of 16%–20% in the cardinal directions. The baseline scenario, which is the current practice of providing balconies on all floors, reduced daylight to less than 75 sDA on the eleventh and second floor, even though it had higher annual enery performance (19%–24%) than the best performance scenario. Application of the design principles to a case study indicated that 58% of the spaces had over 75 sDA for both Baseline and Best performance scenarios, while an increase in enery performance of 1%–3% was found in the Best performance scenario compared to the Baseline.

Hybrid Solar and Wind Electric System for Romanian Nearly Zero Energy Buildings (nZEB) - Case Study

2016 ◽  
Vol 841 ◽  
pp. 110-115
Author(s):  
Gheorge Badea ◽  
Raluca Andreea Felseghi ◽  
Simona Răboaca ◽  
Ioan Aşchilean ◽  
Andrei Bolboacă ◽  
...  
Keyword(s):  
Energy Use ◽  
Residential Buildings ◽  
Energy Performance ◽  
Green Energy ◽  
Design Solution ◽  
Design Parameters ◽  
Zero Energy ◽  
Electric System ◽  
Zero Energy Buildings

For a good approach to new challenges recommended by EU Energy Performance of Buildings Directive, nearly Zero Energy Buildings (nZEB) concept for new residential buildings is conceived in order to drastically improving the overall performance of classical buildings, especially in terms of energy use, production and CO2 equivalent (CO2e) emissions. This paper shows the results of the case study where was investigated energy, economic and environmental performances of hybrid solar and wind system for neutral in terms of climate parameters nZEB. The aim of this study was to demonstrate the capability and feasibility of RES hybrid technology for the energy supply of Romanian nZEB, and also, was to establish new general criteria with the goal to determinate the optimal design solution and providing general principles for green energy production. The main results reveal that Romania has a potential for green energy to implement the new concept nZEB and the global technical optimum of a hybrid system for nZEB is determined by the optimal interaction between the design parameters. The hybrid solar and wind electric systems are functioned in operational stand alone mode, its are supplied 100% by energy from RES and embedded CO2 emissions are decreased by over 50% compared to the classics systems.

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