scholarly journals Orientation of Buildings: Predictive Control Based on the Calculation of Temperature and Solar Direct Contribution

2015 ◽  
Vol 55 ◽  
pp. 94-101
Author(s):  
M. Hamdani ◽  
S.M.A. Bekkouche ◽  
M.K. Cherier ◽  
N. Benamrane ◽  
T. Benouaz
Keyword(s):  
Predictive Control ◽  
Indoor Air ◽  
Residential Buildings ◽  
Energy Performance ◽  
The North ◽  
Air Temperatures ◽  
The Impact ◽  
North And South ◽  
Small Advantage ◽  
Semi Arid

The objective of this study was to use simulation as a tool to establish a possible relationship between orientation and energy performance of conventional residential buildings in Ghardaia. The findings of this study, when integrated in our site, will help in the realisation of efficient and sustainable energy performance of our built environment.To illustrate the impact of the guidance on indoor air temperatures and solar gain of habitat has been studied for this type of climate (semi-arid). Along with this simulation using a TRNSYS (version16.1) was performed to validate the results of the field and to test several possibilities for guidance and improvements to determine the elements that can be used to better conditions.From these results, it appears that the north and south directions during this period are more favorable with a small advantage for the south orientation. This is explained by the amounts of daily radiation incident on the two facades that are not significantly different [1, 2].

scholarly journals The Impact of Infiltration on Heating Systems Dimensioning in Estonian Climate

2020 ◽  
Vol 172 ◽  
pp. 05004
Author(s):  
Raimo Simson ◽  
Taaniel Rebane ◽  
Martin Kiil ◽  
Martin Thalfeldt ◽  
Jarek Kurnitski
Keyword(s):  
Air Temperature ◽  
Indoor Air ◽  
Energy Performance ◽  
Simulation Software ◽  
Heat Losses ◽  
Climatic Data ◽  
Heating Systems ◽  
Air Temperatures ◽  
The Impact ◽  
Calculation Models

In this study we analysed the climatic conditions for infiltration estimation, different calculation methods and infiltration impact on heat load for heating systems dimensioning. To determine the wind conditions at low air temperatures of the coastal- and inland climatic zones in Estonia, 42 years of climatic data for Tallinn and Tartu were investigated. Calculation models with detailed air leakages were constructed of a single and two-storey detached house using dynamic simulation software IDA ICE. Simulations were carried out with the constructed calculation models, simulating various wind and sheltering conditions to determine the heating load of the buildings under measured wind conditions at the design external air temperatures. The simulation results were compared with results calculated with European Standard EN 12831:2017, methodology given in the Estonian regulation for calculating energy performance of buildings and with simulations using the default settings in IDA ICE based on the ASHRAE design day conditions. The percentage of heat losses caused by infiltration was found as 13-16% of all heat losses for the studied buildings. Simulations with historical climate periods showed that even in windy weather conditions the heating system dimensioned by the methods analysed may not be able to provide the required indoor air temperature. Analysis using the coldest and windiest periods showed that when systems are dimensioned by the studied methods, the highest decline in indoor air temperature occurs on the windiest day and not on the coldest day. The impact of high wind speeds and low sheltering conditions resulted up to 50% of all heat losses.

scholarly journals Evaluation of Urban-Scale Building Energy-Use Models and Tools—Application for the City of Fribourg, Switzerland

2021 ◽  
Vol 13 (4) ◽  
pp. 1595
Author(s):  
Valeria Todeschi ◽  
Roberto Boghetti ◽  
Jérôme H. Kämpf ◽  
Guglielmina Mutani
Keyword(s):  
Machine Learning ◽  
Energy Use ◽  
Residential Buildings ◽  
Building Energy ◽  
Energy Performance ◽  
Space Heating ◽  
Engineering Model ◽  
Building Energy Use ◽  
The Impact ◽  
The City

Building energy-use models and tools can simulate and represent the distribution of energy consumption of buildings located in an urban area. The aim of these models is to simulate the energy performance of buildings at multiple temporal and spatial scales, taking into account both the building shape and the surrounding urban context. This paper investigates existing models by simulating the hourly space heating consumption of residential buildings in an urban environment. Existing bottom-up urban-energy models were applied to the city of Fribourg in order to evaluate the accuracy and flexibility of energy simulations. Two common energy-use models—a machine learning model and a GIS-based engineering model—were compared and evaluated against anonymized monitoring data. The study shows that the simulations were quite precise with an annual mean absolute percentage error of 12.8 and 19.3% for the machine learning and the GIS-based engineering model, respectively, on residential buildings built in different periods of construction. Moreover, a sensitivity analysis using the Morris method was carried out on the GIS-based engineering model in order to assess the impact of input variables on space heating consumption and to identify possible optimization opportunities of the existing model.

The impact of mechanical ventilation operation strategies on indoor CO2 concentration and air exchange rates in residential buildings

2020 ◽  
pp. 1420326X2096076
Author(s):  
Pedro F. Pereira ◽  
Nuno M. M. Ramos
Keyword(s):  
Mechanical Ventilation ◽  
Air Quality ◽  
Exchange Rates ◽  
Indoor Air Quality ◽  
Indoor Air ◽  
Residential Buildings ◽  
Ventilation Strategy ◽  
The Impact ◽  
Mechanical Extraction ◽  
Air Exchange

In Portugal, residential buildings commonly have their ventilation strategy changed after commissioning. This occurs due to the building managers' willingness to reduce shared costs with the electricity needed for fan operation. However, this option is not technically supported, and the effects of such a strategy on indoor air quality-related to human pollutants are yet to be quantified. CO2 was monitored in 15 bedrooms and air exchange rates were calculated for each room. The air exchange rate values ranged from 0.18 to 0.53 h−1 when mechanical extraction ventilation was off, and from 0.45 to 0.90 h−1 when mechanical extraction ventilation was on, which represents an average increase of 119%. With the current intermittent ventilation strategy, all rooms remain above 1500 ppm for a given percentage of time, and 12 rooms presenting CO2 concentrations above 2000 ppm. Simulations of theoretical CO2 concentrations, for a non-interrupted mechanical ventilation strategy show that no rooms would accumulate CO2 concentrations above 2000 ppm, and only 25% would present CO2 concentrations above 1500 ppm. Pearson correlations between the monitored CO2 and human and spatial factors identified two relevant parameters. Those parameters correspond to ratios between CO2 generation and floor area ([Formula: see text]), and airflow with CO2 generation ([Formula: see text]). The proposed ratios could be used as ways to optimise ventilation costs and indoor air quality.

scholarly journals DIFFERENCES AND SIMILARITIES IN IMPACTS OF HYDROELETRIC DAMS BETWEEN NORTH AND SOUTH OF BRAZIL

2016 ◽  
Vol 19 (2) ◽  
pp. 265-286 ◽  
Author(s):  
GUILLAUME LETURCQ
Keyword(s):  
Hydroelectric Dams ◽  
Secondary Sources ◽  
The North ◽  
The People ◽  
Hydroelectric Dam ◽  
Area North ◽  
South Of Brazil ◽  
The Impact ◽  
North And South ◽  
Belo Monte

Abstract The environmental impacts of hydroelectric dams in Brazil are investigated in local and regional scales, for the last years. In this paper, we analyze the impact than the establishment of a hydroelectric dam has for the people and their spaces, with the comparative experiences occurred for the North and South of Brazil. We will focus on aspects related to the organization of families, social fight, the compensation and resettlement of people affected by the dam's construction, as well we take a look to the similarities between the two areas, with emphasis on aspects related to migration, mobility and landscapes. For this, we rely on research carried out on the river Uruguay (South), based on interviews, questionnaires and studies of primary and secondary sources, from 2007 to 2014 and also in a survey that is currently being held in Belo Monte area (North), which also uses primary and secondary sources, with fieldwork periods.

Music and Censorship in Vietnam since 1954

2015 ◽  
Author(s):  
Barley Norton
Keyword(s):  
Reform Era ◽  
The North ◽  
Vietnamese American ◽  
Cultural Climate ◽  
History Of ◽  
Impact Of Technology ◽  
Conventional Systems ◽  
Cultural Freedom ◽  
The Impact ◽  
North And South

This chapter traces the history of music censorship in Vietnam since 1954 with reference to a broad range of music genres. It discusses music censorship from 1954 to 1975, when Vietnam was divided into North and South. The tight ideological control established by the Vietnamese Communist Party in the North is compared with music movements linked to antiwar protests in the South. The chapter then examines the period of severe censorship following the end of the Vietnamese-American war in 1975 and considers how the cultural climate changed in the reform era after 1986. It highlights the limits of cultural freedom in the reform era and discusses how music censorship has become intertwined with concerns about the effects of globalization on morality and national identity. Finally, the chapter addresses the impact of technology since the late 1990s, paying particular attention to Vietnamese rap and the potential for musicians to use the Internet to bypass conventional systems of state censorship.

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 Modeling Nearly Zero Energy Buildings for Sustainable Development in Rural Areas

Energies ◽  
2020 ◽  
Vol 13 (10) ◽  
pp. 2593 ◽  
Author(s):  
Reza Khakian ◽  
Mehrdad Karimimoshaver ◽  
Farshid Aram ◽  
Soghra Zoroufchi Benis ◽  
Amir Mosavi ◽  
...  
Keyword(s):  
Energy Saving ◽  
Rural Areas ◽  
Residential Buildings ◽  
Building Design ◽  
Energy Performance ◽  
Payback Period ◽  
Zero Energy ◽  
Multiple Parameters ◽  
Shading Devices ◽  
The Impact

The energy performance of buildings and energy-saving measures have been widely investigated in recent years. However, little attention has been paid to buildings located in rural areas. The aim of this study is to assess the energy performance of two-story residential buildings located in the mountainous village of Palangan in Iran and to evaluate the impact of multiple parameters, namely building orientation, window-to-wall ratio (WWR), glazing type, shading devices, and insulation, on its energy performance. To attain a nearly zero energy building design in rural areas, the building is equipped with photovoltaic modules. The proposed building design is then economically evaluated to ensure its viability. The findings indicate that an energy saving of 29% can be achieved compared to conventional buildings, and over 22 MWh of electricity can be produced on an annual basis. The payback period is assessed at 21.7 years. However, energy subsidies are projected to be eliminated in the near future, which in turn may reduce the payback period.

scholarly journals Improving thermal stability and reduction of energy consumption by implementing Trombe wall construction in the process of building design: The Serbia region

2018 ◽  
Vol 22 (6 Part A) ◽  
pp. 2355-2365
Author(s):  
Veliborka Bogdanovic ◽  
Dusan Randjelovic ◽  
Miomir Vasov ◽  
Marko Ignjatovic ◽  
Jelena Stevanovic
Keyword(s):  
Energy Consumption ◽  
Residential Buildings ◽  
Building Design ◽  
Energy Performance ◽  
Wall Structure ◽  
Climatic Data ◽  
The South ◽  
Trombe Wall ◽  
Wall Construction ◽  
The Impact

This paper analyzes the impact of Trombe wall construction on heating and cooling demands of building with form (rectangular single-store building of about one hundred square meters area) which is common for individual residential buildings in the Republic of Serbia. Trombe wall, as a representative of a passive solar design, was installed on the south wall of the building. Model of the building was made in the Google SketchUp software, while the results of energy performance were obtained using EnergyPlus and jEplus. Parameters of thermal comfort and climatic data for the area of city of Belgrade, Republic of Serbia, were taken into account. Coverage of the south fa?ade was varied, as well as the thickness of the thermal mass and orientation. Energy consumption of the object is discussed, based on obtained results of the analysis. According to comparative analysis of the above mentioned models it can be concluded that the application of the Trombe wall structure on south side may lead to savings of 33% on heating, but also the higher energy consumption for cooling. Total energy consumption on an annual basis is reduced by using this system.

scholarly journals Bayesian Calibrating Educational Building Thermal Models to Hourly Indoor Air Temperature: Methodology and Case Study

2021 ◽  
Author(s):  
Danlin Hou ◽  
Chang Shu ◽  
Lili Ji ◽  
Ibrahim Galal Hassan ◽  
Liangzhu (Leon) Wang
Keyword(s):  
Thermal Performance ◽  
Indoor Air ◽  
Real Life ◽  
Calibration Procedure ◽  
Energy Performance ◽  
Uncertainty Assessment ◽  
Vulnerable Groups ◽  
Thermal Models ◽  
Air Temperatures ◽  
The One

Abstract With the increase in the frequency and duration of heatwaves and extreme temperatures, global warming becomes one of the most critical environmental issues. Heatwaves pose significant threats to human health, including related diseases and deaths, especially for vulnerable groups. Such as the one during the 2018 summer in Montreal, Canada, caused up to 53 deaths, with most lived in buildings without access to air-conditioning. Unlike building energy models that mainly focus on energy performance, building thermal models emphasizes indoor thermal performance without a mechanical system. It is required an understanding of the complex dynamic building thermal physics in which detailed building parameters need to be specified but challenging to be determined in real life. The uncertainty assessment of the parameters estimates can make the results more reliable. Therefore, in this paper, a Bayesian-based calibration procedure was presented and applied to an educational building. First, the building was modeled in EnergyPlus based on an in-site visit and related information collection. Second, a sensitivity analysis was performed to identify significant parameters affecting the errors between simulated and monitored indoor air temperatures. Then, a Meta-model was developed and used during the calibration process instead of the original EnergyPlus model to decrease the requirement of computing load and time. Subsequently, the Bayesian inference theory was employed to calibrate the model on hourly indoor air temperatures in summer. Finally, the model was validated. It is shown that the Bayesian calibration procedure not only can calibrate the model within the performance tolerance required by international building standards/codes but also predict future thermal performance with a confidence interval, which makes it more reliable.

Sign in / Sign up

Export Citation Format

Share Document