scholarly journals The development of simple calculation model for energy performance of double skin façades

2012 ◽  
Vol 16 (suppl. 1) ◽  
pp. 251-267 ◽  
Author(s):  
Aleksandar Andjelkovic ◽  
Tanja Cvjetkovic ◽  
Damir Djakovic ◽  
Ivan Stojanovic
Keyword(s):  
Mathematical Model ◽  
Weather Conditions ◽  
Simple Calculation ◽  
Energy Performance ◽  
Calculation Model ◽  
Climatic Conditions ◽  
Heating And Cooling ◽  
Air Inlet ◽  
Double Skin ◽  
Two Envelopes

Estimating thermal effect of so called double-skin fa?ades on energy performance of buildings with two envelopes, a proprietary mathematical model of heat transfer through double-skin fa?ades has been developed. A very specific approach of the mathematical model presented here is based on prediction of the double-skin fa?ades interspace temperature and assumption that fa?ade could be treated as a single one declaring the interspace temperature and reduced intensity of solar radiation as the ?outdoor? conditions. In this paper results of the heating and cooling loads as well as the interspace temperature prediction compared for three months (January, April and July) and for the west oriented fa?ade with ordinary and absorption glass are presented. Fa?ade is placed under climatic conditions of Belgrade (45? North Latitude). Also, results for weather conditions of sunny and cloudy day are shown. Results includes influence of air velocity in interspace of fa?ades for April and July. Following a type of the double-skin fa?ade construction assumption it was implied that the space between the two envelopes is closed during the winter mode for air circulation, in order to have temperature higher inside than outside and opposite in the summer mode, air inlet and outlet are opened in order to prevent much higher temperatures than the outside ones, and higher cooling load of an air-conditioned building, as a consequence. Taking only thermal effects into account, presented prediction has proven that double-skin fa?ades decrease both building heat losses and heat gains throughout the year, and give significant contribution to the building energy consumption savings.

scholarly journals Research On Technological Utilizing in an Automatic Device for Collecting Rain and Snow in Qinghai Province, China

2021 ◽  
Vol 276 ◽  
pp. 01029
Author(s):  
Mingtao Long ◽  
Luyao Hu ◽  
Jiaquan Yang ◽  
Yongjun Hu ◽  
Zihan Wang ◽  
...  
Keyword(s):  
Water Resources ◽  
Water Purification ◽  
Rural Areas ◽  
Flood Control ◽  
Weather Conditions ◽  
Automatic Device ◽  
Calculation Model ◽  
Climatic Conditions ◽  
Positive Role ◽  
And Storage

Based on the climatic conditions in the northwest and the widely used water storage method in the northwest rural areas, we designed a rain and snow collection device, which is realized by an inductor and an “M” collection curtain, which uses the rotation of the motor and the supply of the heating film. Water purification and storage can be obtained through compound grit tanks, biochar adsorption systems, etc. The collected water resources can be integrated with water purification and storage through flood control and antifreeze devices. Real-time senses the changes of water level and water temperature. In this article, a calculation model for the optimal sedimentation effect is also established, which can calculate the minimum scale parameters of the sedimentation tank under different weather conditions, and provide guidance for the construction of the system. In addition, we tested the actual collection capacity of the system, and the results showed that the system has high practical value. At present, there is no a complete and systematic study integrated with it in the Northwest region. This system can alleviate the lack of water resources in some areas to a certain extent, play a positive role in the rural ecological environment and lessen flood

scholarly journals Investigating The Impact Of Thermal Mass Towards Energy Efficient Housing In Canada

2021 ◽  
Author(s):  
Tasnuva Ahmed
Keyword(s):  
Energy Consumption ◽  
Energy Efficient ◽  
Energy Performance ◽  
Climatic Conditions ◽  
Simulation Software ◽  
High Mass ◽  
Thermal Mass ◽  
Heating And Cooling ◽  
R Value ◽  
The Impact

The building industry is striving for environmental friendly and energy efficient facility developments, as we have used most of our natural resources for comfortable living. Therefore energy efficient houses are very significant to reduce energy consumption. Thermal mass can be used as one of the many techniques of energy efficiency in the housing industry. Thermal mass can store heat in it which can be released at a later time. This behaviour of thermal mass can play a significant role in heating and cooling energy consumption of houses. This study investigates the impact of thermal mass on heating and cooling energy performance of a detached house and a row attached house, which are two main types of housing in Canada. Energy Plus simulation software has been used in the study. Also the study includes two different climatic conditions in Canada, such as Toronto and Vancouver, to envision how thermal mass behaviour changes with climates. All these different studies show thermal mass has significant impact on reduced energy consumption (15% savings in Vancouver for CCHT house) and lowering indoor air temperature. Other strategies such as insulation high R value, increased south face glazing and reduced glazing U value have been integrated with thermal mass to see energy performance in both climates. It hows more energy reduction than only thermal mass strategy. For instance, in CCHT house insulation high R value with concrete high mass reduces maximum 27% of total energy for Vancouver location.

scholarly journals Influence of glazing type on energy efficiency of industrial buildings in the process of revitalization: A case study

2019 ◽  
Vol 17 (1) ◽  
pp. 33-44
Author(s):  
Branko Slavkovic
Keyword(s):  
Comparative Analysis ◽  
Carbon Dioxide Emissions ◽  
Energy Performance ◽  
Climatic Conditions ◽  
Building Envelope ◽  
Industrial Building ◽  
Industrial Buildings ◽  
Double Skin ◽  
The Impact ◽  
The City

This paper examines the possibilities of improving the energy performance of an existing industrial building by application of the double skin fa?ade on the revitalization of the building envelope in the climatic conditions of the city Novi Pazar, Republic of Serbia. The aim is to examine the impact of choosing the type of glazing, in the processes of revitalization, on the energy needs of industrial buildings for heating and cooling, as well as the contribution of the measures implemented to improve the energy performance of the selected type and model of industrial building. The energy performance of buildings was obtained using the software DesignBuilder and EnergyPlus simulation platform, taking into account the parameters of required internal temperature and climate data for the Republic of Serbia. The comparative analysis of the results of energy simulation according to the criterion of achieving greater energy savings and reduced carbon dioxide emissions was performed. The methodological approach in this research involves creating revitalization scenarios of industrial buildings with a shed roof construction, selection of the specific building according to whose properties by numerical simulation possibilities for energy revitalization depletion were investigated and comparative analysis of the obtained results was performed. The primary objective of this research is to investigate the impact of choosing the type of glazing on the energy performance of industrial buildings with a shed roof construction and to determine the optimal approach to energy revitalization of existing industrial buildings with the implementation of the double skin fa?ade under the climatic conditions of the city Novi Pazar, Republic of Serbia. The results of this paper indicate the negative characteristics of the kopilit glass to solar gains, whose retention requires a large amount of heating energy. While replacing of kopilit glass with a low-energy glass increases the amount of energy required to cooling of the building. With this research, through various revitalization scenarios, it is also indicated that using a double skin fa?ade in the revitalization process of the selected building, has a very similar impact on reducing CO2 emissions regardless of the type of glazing choice.

scholarly journals Building Energy Performance Analysis: An Experimental Validation of an In-House Dynamic Simulation Tool through a Real Test Room

Energies ◽  
2019 ◽  
Vol 12 (21) ◽  
pp. 4107 ◽  
Author(s):  
Giovanni Barone ◽  
Annamaria Buonomano ◽  
Cesare Forzano ◽  
Adolfo Palombo
Keyword(s):  
Comparative Analysis ◽  
Experimental Validation ◽  
Weather Conditions ◽  
Building Energy ◽  
Energy Performance ◽  
Simulation Tool ◽  
Test Room ◽  
Building Energy Performance ◽  
Heating And Cooling ◽  
Real Test

This paper focuses on the experimental validation of a building energy performance simulation tool by means of a comparative analysis between numerical results and measurements obtained on a real test room. The empirical tests were carried out for several months under variable weather conditions and in free-floating indoor temperature regime (switched off HVAC system). Measurements were exploited for validating an in-house simulation tool, implemented in MatLab and called DETECt, developed for dynamically assessing the energy performance of buildings. Results show that simulated indoor air and surface room temperatures resulted in very good agreement with the corresponding experimental data; the detected differences were often lower than 0.5 °C and almost always lower than 1 °C. Very low mean absolute and percentage errors were always achieved. In order to show the capabilities of the developed simulation tool, a suitable case study focused on innovative solar radiation high-reflective coatings, and infrared low-emissivity materials is also presented. The performance of these coatings and materials was investigated through a comparative analysis conducted to evaluate their heating and cooling energy saving potentials. Simulation results, obtained for the real test cell considered as equipped with such innovative coatings and material, show that for the weather zone of Naples a 5% saving is obtained both in summer and in winter by simultaneously adopting a high-reflectance coating and a low- emissivity plaster for roof/external walls and interior walls, respectively.

scholarly journals Investigating The Impact Of Thermal Mass Towards Energy Efficient Housing In Canada

2021 ◽  
Author(s):  
Tasnuva Ahmed
Keyword(s):  
Energy Consumption ◽  
Energy Efficient ◽  
Energy Performance ◽  
Climatic Conditions ◽  
Simulation Software ◽  
High Mass ◽  
Thermal Mass ◽  
Heating And Cooling ◽  
R Value ◽  
The Impact

The building industry is striving for environmental friendly and energy efficient facility developments, as we have used most of our natural resources for comfortable living. Therefore energy efficient houses are very significant to reduce energy consumption. Thermal mass can be used as one of the many techniques of energy efficiency in the housing industry. Thermal mass can store heat in it which can be released at a later time. This behaviour of thermal mass can play a significant role in heating and cooling energy consumption of houses. This study investigates the impact of thermal mass on heating and cooling energy performance of a detached house and a row attached house, which are two main types of housing in Canada. Energy Plus simulation software has been used in the study. Also the study includes two different climatic conditions in Canada, such as Toronto and Vancouver, to envision how thermal mass behaviour changes with climates. All these different studies show thermal mass has significant impact on reduced energy consumption (15% savings in Vancouver for CCHT house) and lowering indoor air temperature. Other strategies such as insulation high R value, increased south face glazing and reduced glazing U value have been integrated with thermal mass to see energy performance in both climates. It hows more energy reduction than only thermal mass strategy. For instance, in CCHT house insulation high R value with concrete high mass reduces maximum 27% of total energy for Vancouver location.

MODELING AND FABRICATION OF A KINETIC SOLAR ENERGY-ABSORBING WINDOW AS A GREEN IDEA FOR SUSTAINABLE FUTURE BUILDINGS

2018 ◽  
Vol 13 (2) ◽  
pp. 145-162 ◽  
Author(s):  
Masoud Valinejadshoubi ◽  
Mannan Ghanizadehgrayli ◽  
Sahar Heidari
Keyword(s):  
Energy Consumption ◽  
Natural Ventilation ◽  
Cooling System ◽  
Ventilation System ◽  
Weather Conditions ◽  
Vital Role ◽  
Design Strategies ◽  
Heating And Cooling ◽  
Primary Means ◽  
Double Skin

INTRODUCTION Renewable versus nonrenewable energy sources and their respective environmental impacts have emerged as preeminent industrial, as well as environmental concerns. Negotiation between policies that promote economic development with those promoting conservationism has yielded promising opportunities for the future. These opportunities engage frameworks focused on economic directives while simultaneously considering the need for environmental directives. Buildings present a unique opportunity for sustainability as they represent the largest proportion of consumed energy, relative to other consumers reliant on the energy grid system. The largest source of energy expenditure in a modern building is through the heating and cooling system which facilitates and maintains a comfortable living temperature. By effectively implementing innovative approaches focused on energy preservation and overall reduction of consumption, it is possible to meet emission reduction goals and mitigate other adverse environmental conditions. Windows play a vital role in energy consumption and overall maintenance of a comfortable temperature. Understandably, the construction and fabrication of windows are the primary means through which optimized temperatures are achieved. This occurs not only through heat and energy transference but also by providing a protective differential between the inside of the building and the harsh weather conditions of the outdoors. As such, appropriate widow design strategies not only enhance comfort but reduce overall energy consumption. This study seeks to evaluate double-skin windows in order to offer a solution to excessive energy consumption. The windows work by generating a natural ventilation system in summer and then by producing hot air in winter for year-round comfort that is economical. Since current double-skin windows fail to effectively provide ventilation during warm seasons, a kinetic double-skin window was proposed to address this problem and optimize the heating and cooling functions of the building. The results of this research are applicable to modern construction and can be implemented into current design structures.

scholarly journals Метод сингулярного спектрального аналізу з інтервальною невизначеністю для прогнозування агрокліматичних умов

2016 ◽  
pp. 84-88
Author(s):  
Л. І. Лєві ◽  
О. М. Петровський
Keyword(s):  
Mathematical Model ◽  
High Frequency ◽  
Singular Spectrum Analysis ◽  
Weather Conditions ◽  
Climatic Conditions ◽  
Interval Uncertainty ◽  
Climatic Data ◽  
Optimum Conditions ◽  
Sowing Seed ◽  
The Mathematical Model

У статті запропоновано математичну модель для аналізу і прогнозування агрокліматичних даних методом сингулярного спектрального аналізу (ССА) з інтервальною невизначеністю. Математична модель призначена для визначення оптимальних погодних умов у випадку посіву насіння пшениці попередньо стимульованого електромагнітним полем високої частоти. Показано, що передпосівна стимуляція насіння призводить до збільшення поглинання води, поживних речовин і відповідно вимагає оптимальних умов для проростання і подальшої веґетації рослин. Математичне моделювання дало змогу прогнозувати неодхідні оптимальні агрокліматичні умови за показниками вологості і температури ґрунту. The paper offers a mathematical model for the analysis and prediction of agro-climatic data by singular spectrum analysis (SSA) with the interval uncertainty. The mathematical model is designed to determine the optimal weather conditions at sowing wheat seed which is previously stimulated by electromagnetic field of high frequency. It was shown that pre-sowing seed stimulation leads to an increase of water uptake, nutrients and therefore requires optimum conditions for germination and subsequent plant growth. Mathematical modeling made it possible to predict the required optimum agro-climatic conditions in terms of humidity and soil temperature.

Impact of roof shading on building energy performance in warm & humid climatic places of India

2020 ◽  
pp. 50-64
Author(s):  
Kuladeep Kumar Sadevi ◽  
Avlokita Agrawal
Keyword(s):  
Energy Consumption ◽  
Energy Conservation ◽  
Energy Performance ◽  
General Assumption ◽  
Climatic Conditions ◽  
Building Envelope ◽  
Passive Cooling ◽  
Base Case ◽  
U Value ◽  
The Impact

With the rise in awareness of energy efficient buildings and adoption of mandatory energy conservation codes across the globe, significant change is being observed in the way the buildings are designed. With the launch of Energy Conservation Building Code (ECBC) in India, climate responsive designs and passive cooling techniques are being explored increasingly in building designs. Of all the building envelope components, roof surface has been identified as the most significant with respect to the heat gain due to the incident solar radiation on buildings, especially in tropical climatic conditions. Since ECBC specifies stringent U-Values for roof assembly, use of insulating materials is becoming popular. Along with insulation, the shading of the roof is also observed to be an important strategy for improving thermal performance of the building, especially in Warm and humid climatic conditions. This study intends to assess the impact of roof shading on building’s energy performance in comparison to that of exposed roof with insulation. A typical office building with specific geometry and schedules has been identified as base case model for this study. This building is simulated using energy modelling software ‘Design Builder’ with base case parameters as prescribed in ECBC. Further, the same building has been simulated parametrically adjusting the amount of roof insulation and roof shading simultaneously. The overall energy consumption and the envelope performance of the top floor are extracted for analysis. The results indicate that the roof shading is an effective passive cooling strategy for both naturally ventilated and air conditioned buildings in Warm and humid climates of India. It is also observed that a fully shaded roof outperforms the insulated roof as per ECBC prescription. Provision of shading over roof reduces the annual energy consumption of building in case of both insulated and uninsulated roofs. However, the impact is higher for uninsulated roofs (U-Value of 3.933 W/m2K), being 4.18% as compared to 0.59% for insulated roofs (U-Value of 0.33 W/m2K).While the general assumption is that roof insulation helps in reducing the energy consumption in tropical buildings, it is observed to be the other way when insulation is provided with roof shading. It is due to restricted heat loss during night.

RESEARCH OF INDICATORS OF A VEHICLE WITH A DIESEL WORKING ON DIESEL AND DIESEL GAS CYCLES USING THE MATHEMATICAL MODEL

2020 ◽  
pp. 14-19
Author(s):  
Serhii Kovbasenko ◽  
Andriy Holyk ◽  
Serhii Hutarevych
Keyword(s):  
Mathematical Model ◽  
Diesel Engine ◽  
Environmental Performance ◽  
Energy Performance ◽  
Dual Fuel ◽  
Fuel System ◽  
Compressed Natural Gas ◽  
Diesel Vehicles ◽  
Diesel Cycle ◽  
The Mathematical Model

The features of an advanced mathematical model of motion of a truck with a diesel engine operating on the diesel and diesel gas cycles are presented in the article. As a result of calculations using the mathematical model, a decrease in total mass emissions as a result of carbon monoxide emissions is observed due to a decrease in emissions of nitrogen oxides and emissions of soot in the diesel gas cycle compared to the diesel cycle. The mathematical model of a motion of a truck on a city driving cycle according to GOST 20306-90 allows to study the fuel-economic, environmental and energy indicators of a diesel and diesel gas vehicle. The results of the calculations on the mathematical model will make it possible to conclude on the feasibility of converting diesel vehicles to using compressed natural gas. Object of the study – the fuel-economic, environmental and energy performance diesel engine that runs on dual fuel system using CNG. Purpose of the study – study of changes in fuel, economic, environmental and energy performance of vehicles with diesel engines operating on diesel and diesel gas cycles, according to urban driving cycle modes. Method of the study – calculations on a mathematical model and comparison of results with road tests. Bench and road tests, results of calculations on the mathematical model of motion of a truck with diesel, working on diesel and diesel gas cycles, show the improvement of environmental performance of diesel vehicles during the converting to compressed natural gas in operation. Improvement of environmental performance is obtained mainly through the reduction of soot emissions and nitrogen oxides emissions from diesel gas cycle operations compared to diesel cycle operations. The results of the article can be used to further develop dual fuel system using CNG. Keywords: diesel engine, diesel gas engine, CNG

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