Energy performance of cool roofs under the impact of actual weather data

2017 ◽  
Vol 145 ◽  
pp. 284-292 ◽  
Author(s):  
Mirata Hosseini ◽  
Bruno Lee ◽  
Shahin Vakilinia
Keyword(s):  
Energy Performance ◽  
Weather Data ◽  
Cool Roofs ◽  
The Impact

scholarly journals Impacts of Microclimate Conditions on the Energy Performance of Buildings in Urban Areas

Buildings ◽  
2019 ◽  
Vol 9 (8) ◽  
pp. 189 ◽  
Author(s):  
Javanroodi ◽  
M.Nik
Keyword(s):  
Urban Areas ◽  
Energy Demand ◽  
Weather Conditions ◽  
Energy Performance ◽  
Urban Morphology ◽  
Weather Data ◽  
Architectural Form ◽  
Energy Performance Of Buildings ◽  
Microclimate Conditions ◽  
The Impact

Urbanization trends have changed the morphology of cities in the past decades. Complex urban areas with wide variations in built density, layout typology, and architectural form have resulted in more complicated microclimate conditions. Microclimate conditions affect the energy performance of buildings and bioclimatic design strategies as well as a high number of engineering applications. However, commercial energy simulation engines that utilize widely-available mesoscale weather data tend to underestimate these impacts. These weather files, which represent typical weather conditions at a location, are mostly based on long-term metrological observations and fail to consider extreme conditions in their calculation. This paper aims to evaluate the impacts of hourly microclimate data in typical and extreme climate conditions on the energy performance of an office building in two different urban areas. Results showed that the urban morphology can reduce the wind speed by 27% and amplify air temperature by more than 14%. Using microclimate data, the calculated outside surface temperature, operating temperature and total energy demand of buildings were notably different to those obtained using typical regional climate model (RCM)–climate data or available weather files (Typical Meteorological Year or TMY), i.e., by 61%, 7%, and 21%, respectively. The difference in the hourly peak demand during extreme weather conditions was around 13%. The impact of urban density and the final height of buildings on the results are discussed at the end of the paper.

scholarly journals How Climate Trends Impact on the Thermal Performance of a Typical Residential Building in Madrid

Energies ◽  
2020 ◽  
Vol 13 (1) ◽  
pp. 237 ◽  
Author(s):  
S. Soutullo ◽  
E. Giancola ◽  
M. J. Jiménez ◽  
J. A. Ferrer ◽  
M. N. Sánchez
Keyword(s):  
Residential Buildings ◽  
Minimum Energy ◽  
Residential Building ◽  
Energy Performance ◽  
Weather Data ◽  
Design Strategies ◽  
Climate Trends ◽  
Average Value ◽  
Minimum Energy Consumption ◽  
The Impact

Based on the European energy directives, the building sector has to provide comfortable levels for occupants with minimum energy consumption as well as to reduce greenhouse gas emissions. This paper aims to compare the impact of climate change on the energy performance of residential buildings in order to derive potential design strategies. Different climate file inputs of Madrid have been used to quantify comparatively the thermal needs of two reference residential buildings located in this city. One of them represents buildings older than 40 years built according to the applicable Spanish regulations prior to 1979. The other refers to buildings erected in the last decade under more energy-restrictive constructive regulations. Three different climate databases of Madrid have been used to assess the impact of the evolution of the climate in recent years on the thermal demands of these two reference buildings. Two of them are typical meteorological years (TMY) derived from weather data measured before 2000. On the contrary, the third one is an experimental file representing the average values of the meteorological variables registered in Madrid during the last decade. Annual and monthly comparisons are done between the three climate databases assessing the climate changes. Compared to the TMYs databases, the experimental one records an average air temperature of 1.8 °C higher and an average value of relative humidity that is 9% lower.

scholarly journals Energy and Economic Life Cycle Assessment of Cool Roofs Applied to the Refurbishment of Social Housing in Southern Spain

2020 ◽  
Vol 12 (14) ◽  
pp. 5602
Author(s):  
Antonio Dominguez-Delgado ◽  
Helena Domínguez-Torres ◽  
Carlos-Antonio Domínguez-Torres
Keyword(s):  
Life Cycle Assessment ◽  
Life Cycle ◽  
Social Housing ◽  
Aging Effect ◽  
Energy Performance ◽  
Economic Life ◽  
Time Dependent ◽  
Energy Conditions ◽  
Cool Roofs ◽  
The Impact

Energy refurbishment of the housing stock is needed in order to reduce energy consumption and meet global climate goals. This is even more necessary for social housing built in Spain in the middle of the last century since its obsolete energy conditions lead to situations of indoor thermal discomfort and energy poverty. The present study carries out a life cycle assessment of the energy and economic performance of roofs after being retrofitted to become cool roofs for the promotion of social housing in Seville (Spain). Dynamic simulations are made in which the time dependent aging effect on the energy performance of the refurbished cool roofs is included for the whole lifespan. The influence of the time dependent aging effect on the results of the life cycle economic analysis is also assessed. A variety of scenarios are considered in order to account for the aging effect in the energy performance of the retrofitted cool roofs and its incidence while considering different energy prices and monetary discount rates on the life cycle assessment. This is made through a dynamic life cycle assessment in order to capture the impact of the aging dynamic behavior correctly. Results point out significant savings in the operational energy. However, important differences are found in the economic savings when the life cycle analysis is carried out since the source of energy and the efficiency of the equipment used for conditioning strongly impact the economic results.

scholarly journals Cool Roofs in the US: The Impact of Roof Reflectivity, Insulation and Attachment Method on Annual Energy Cost

Energies ◽  
2021 ◽  
Vol 14 (22) ◽  
pp. 7656
Author(s):  
Athanasios Tzempelikos ◽  
Seungjae Lee
Keyword(s):  
Energy Demand ◽  
The United States ◽  
Energy Performance ◽  
Cold Climate ◽  
Cold Climates ◽  
Climate Zones ◽  
The Us ◽  
Cool Roofs ◽  
The Impact ◽  
Warm Climates

While it is well-known that cool roofs can efficiently reduce cooling demand in buildings, their overall energy performance in mixed and cold climates has been a topic of debate. This paper presents a comprehensive simulation study to evaluate the combined impact of roof reflectivity, insulation level, and construction type (adhered vs attached) on annual energy demand and energy costs in the United States, for different buildings and climate zones. EnergyPlus was used to model three building types (retail, office, and school buildings) for the 16 most climate-representative locations in the US using typical reflectivity and insulation values. The results show that (i) roof reflectivity is equally important to roof insulation in warm climates; (ii) for low-rise offices and schools, the benefits of reflective roofs vs dark-colored roofs are clear for all US climatic zones, with higher savings in warm climates; (iii) for big-box-retail buildings, reflective roofs perform better except for cold climate zones 7–8; (iv) dark-colored, mechanically attached roofs achieve slightly better performance than reflective roofs in mixed and cold climates. Decision makers should consider building type, climatic conditions, roof insulation levels, and durability performance, along with roof reflectivity, when assessing the overall potential benefits of cool roofs.

scholarly journals Toward energy-efficient governmental buildings in Egypt: investigating the impact of nano aerogel glazing on energy performance

2019 ◽  
Vol 15 (1) ◽  
pp. 17-24 ◽  
Author(s):  
Ibrahim Rizk Hegazy
Keyword(s):  
Energy Efficient ◽  
Energy Performance ◽  
Advanced Materials ◽  
Weather Data ◽  
Base Case ◽  
Performance Simulation ◽  
Point Temperature ◽  
Significant Research ◽  
Promising Application ◽  
The Impact

Abstract The application of advanced materials in energy conservation is mostly among the urgent issues worldwide. In this context, nanosilica aerogel has received growing attention in the last decade due to its remarkably lower thermal conductivity. Aerogel panels laminated to drywall boards initiated to be used in substantially the energy sufficient buildings. Nevertheless, the greatest and most promising application of silica aerogel appears to be in substantially insulating glazing systems. The present research has concentrated on evaluating the energy performance of the nano aerogel glazing if implemented to the El-Dakahliya governmental headquarters building located in Mansoura city in Egypt, compared with single-glazed windows (base case) and double-glazed windows. The modeling was carried out in Autodesk Revit, and the process of energy performance simulation was carried out by Autodesk Ecotect Analysis by adopting the weather data of Mansoura. The results show that the nano aerogel glazing system succeeds in conserving approximately 19% in the annual energy consumption for a set-point temperature band of 19–27°C. The paper attempts to present significant research especially in studied country. Selected category of buildings may add more originality in term of implementation scope.

scholarly journals Coupling a Building Energy Simulation Tool with a Microclimate Model to Assess the Impact of cool Pavements on the Building’s Energy Performance. Application in a Dense Residential Area

2019 ◽  
Vol 11 (9) ◽  
pp. 2519 ◽  
Author(s):  
Tsoka ◽  
Tsikaloudaki ◽  
Theodosiou
Keyword(s):  
Urban Areas ◽  
Energy Demand ◽  
Thermal Environment ◽  
Energy Performance ◽  
Computational Method ◽  
Weather Data ◽  
Building Unit ◽  
Heating And Cooling ◽  
Data Generator ◽  
The Impact

Replacing conventional pavements with the corresponding high albedo ones constitutes a well-known technique to improve outdoor thermal environment of modern cites. Since most of the existing studies assess the impact of the high albedo pavements at the pedestrian’s height and with respect to thermal comfort, this study aims to examine the effect of the application of highly reflective pavements on the heating and cooling energy needs of a building unit, located inside a dense urban area. Aiming at a higher accuracy of the energy performance simulations, an integrated computational method between ENVI-met model, Meteonorm weather data generator and Energy Plus software is established, to consider the site-specific microclimatic characteristics of the urban areas. The analysis is performed both for the design and the aged albedo values as significant changes may occur due to aging process. The analysis revealed that the application of cool materials on the ground surfaces only marginally affects the energy performance of the examined building unit, both for the design and the aged albedo value; changes on the annual heating and cooling energy demand, for both albedo scenarios did not exceed 1.5% revealing the limited potential of cool pavements regarding the improvement of the energy performance of urban building units.

scholarly journals Intelligent Services for Building Information Modeling - Assessing Variable Input Weather Data for Building Simulations

2013 ◽  
Vol 7 (1) ◽  
pp. 138-145 ◽  
Author(s):  
Constantinos A. Balaras ◽  
Simon Kontoyiannidis ◽  
Elena G. Dascalaki ◽  
Kaliopi G. Droutsa
Keyword(s):  
Building Information Modeling ◽  
Building Design ◽  
Energy Performance ◽  
Information Modeling ◽  
Weather Data ◽  
Climate Data ◽  
Building Simulations ◽  
Design Variables ◽  
Building Information ◽  
The Impact

Building Information Modeling (BIM) for optimizing the total lifecycle cost of buildings is a challenge even today. Inadequate software interoperability, high costs as a result of the fragmented nature of the building industry, lack of standardization, inconsistent technology adoption among stakeholders are just some of the obstacles that architects and engineers face. However, optimization requires a structured procedure that enables continuous changes in design variables and assessment on energy consumption. A holistic building design and construction are already introduced in Europe through the energy performance of buildings directive (EPBD). The requirements have been strengthened by the EPBD recast for achieving cost optimal building designs for the life cycle of the building, moving towards nearly zero energy buildings by the end of the decade. BIM and intelligent services could play a crucial role in these efforts with improved visualization and productivity due to easy retrieval of information, increased coordination of data and exchange of information, all leading to a reduced cost for the design of energy efficient buildings. An ongoing European research project aims to contribute to these needs by developing a Virtual Energy Laboratory that will support building energy performance simulations taking into account the stochastic nature of input parameters and processes. This will be supported by information communication technology features utilizing the necessary computational power through cloud computing. This paper presents an overview of the ongoing efforts and focuses on results for assessing the impact of different input weather and climate data that are pertinent in building load and energy performance calculations.

The impact of climate change on the thermal-energy performance of the SCIP and ICF wall systems for social housing in Brazil

2021 ◽  
pp. 1420326X2110380
Author(s):  
Alexandre Santana Cruz ◽  
Eduardo Grala da Cunha
Keyword(s):  
Climate Change ◽  
Thermal Energy ◽  
Social Housing ◽  
Weather Conditions ◽  
Energy Performance ◽  
Weather Data ◽  
Construction Time ◽  
Change World ◽  
Impact Of Climate Change ◽  
The Impact

The social housing sector is playing an important role in Brazil, due to the necessity of its expansion. Currently, many residential projects perform poorly in terms of energy efficiency and thermal comfort. In addition, the impact of climate change on energy consumption may aggravate the energy scenario, increasing the dependence on the heating, ventilation and air conditioning system. In parallel to this, there is a growing adoption of the Structural Concrete Insulated Panels (SCIP) and insulated concrete form (ICF) in the Brazilian construction industry, due to their advantages in reducing construction time, and cost. Therefore, this study provides a discussion on thermal-energy performance focusing on parametric analysis of the SCIP and ICF wall systems adoption for social housing in Brazil. Due to the fact that building performance is heavily affected by weather conditions, this study evaluated the computer simulation of the thermal-energy performance of SCIP and ICF wall systems for hot climates while addressing the impacts of climate change. The city of Rio de Janeiro, characterized by the tropical climate was selected, and the Climate Change World Weather File Generator (CCWorldWeatherGen) tool was used to produce weather data for future climate scenarios, such as 2020, 2050 and 2080.

scholarly journals Impact of IPPC Scenarios on indoor environment quality of historic buildings

2019 ◽  
Vol 111 ◽  
pp. 03054 ◽  
Author(s):  
Jan Weyr ◽  
Richard Kalný ◽  
Jiří Hirš
Keyword(s):  
Climate Change ◽  
Indoor Environment ◽  
Global Climate ◽  
Energy Performance ◽  
Weather Data ◽  
Climate Change Scenarios ◽  
Intergovernmental Panel ◽  
Environment Quality ◽  
Indoor Environment Quality ◽  
The Impact

Ensuring proper indoor environment quality in buildings with historic value or buildings located in historic centres of cities is not an easy task. These buildings are frequently listed in historic preservation lists; thus, the amount of possible refurbishment methods is significantly limited due to increased protection. This article deals with comprehensive analysis of internal microclimate of a multi-purpose building located in the historic centre of Prague during summer period. Possible refurbishment methods permitted by the National Heritage Institute are analysed and compared using building energy performance simulation tool BSim in order to achieve proper working conditions in offices in the building. Structural and technical modifications are proposed in order to optimize the amount of solar heat gains leading to reduction of overheating and increase of energy efficiency. Furthermore, two global warming projections from the Fourth Assessment Report of Intergovernmental Panel on Climate Change are applied to the current weather data to examine the impact of the global climate change on the building. As expected, the cooling demand increases with the climate change scenarios presenting more difficult challenges to maintain the indoor environment quality within the limitations given by the legislation.

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