Optimization method for building envelope design to minimize carbon emissions of building operational energy consumption using orthogonal experimental design (OED)

2013 ◽  
Vol 37 ◽  
pp. 148-154 ◽  
Author(s):  
Jianjun Zhu ◽  
David A.S. Chew ◽  
Sainan Lv ◽  
Weiwei Wu
Keyword(s):  
Energy Consumption ◽  
Experimental Design ◽  
Carbon Emissions ◽  
Optimization Method ◽  
Building Envelope ◽  
Orthogonal Experimental Design ◽  
Operational Energy

scholarly journals Optimization method for prefabricated restroom envelope energy saving characteristics in hot summer and cold winter zone

2021 ◽  
pp. 014459872199393
Author(s):  
Lirui Zhang ◽  
Hong Zhang ◽  
Xu Xu ◽  
Ling Dong
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Coefficient ◽  
Energy Consumption ◽  
Transfer Coefficient ◽  
Thermal Characteristics ◽  
Optimization Method ◽  
Building Energy ◽  
Building Envelope ◽  
Cold Winter ◽  
Energy Consuming

In order to reduce the restroom envelope energy consumption, one optimization method on basis of analyzing the influence of heat transfer coefficient on the performance of a prefabricated restroom envelope in a hot summer and cold winter zone was proposed. An energy-consuming model of prefabricated restroom in Nanjing is initially built based on Designer's Simulation Toolkit software. Subsequently, the effect of external walls, rooftops, external windows with various thermal characteristics on the building envelope is analyzed respectively. Simultaneously, a method that only changes the heat transfer coefficient of the prefabricated restroom envelope while keeping other parameters unchanged is adopted. Results show that, for a prefabricated restroom, the optimal range of heat transfer coefficient of the external wall, rooftop, and external window in hot summer and cold winter zone is 0.199∼0.22, 0.16∼0.19, and 3.0∼3.1 W/(m2·K), respectively. When the window-to-wall ratio is less than 0.2, the priority of the wall heat transfer coefficient on building energy consumption is higher than that of the rooftop heat transfer coefficient, simultaneously, the rooftop heat transfer coefficient has priority higher than window heat transfer coefficient. Thus, it is of great significance to optimize the design of the prefabricated restroom envelope in a hot summer and cold winter zone, which provides relative reference for thermal performance improvement of prefabricated restrooms.

scholarly journals An Exhaustive Search Energy Optimization Method for Residential Building Envelope in Different Climatic Zones of Kazakhstan

Buildings ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 633
Author(s):  
Mirzhan Kaderzhanov ◽  
Shazim Ali Memon ◽  
Assemgul Saurbayeva ◽  
Jong R. Kim
Keyword(s):  
Energy Consumption ◽  
Energy Savings ◽  
Residential Buildings ◽  
Average Energy ◽  
Optimization Method ◽  
Building Envelope ◽  
Energy Reduction ◽  
Estimation Model ◽  
Total Energy Consumption ◽  
Energy Estimation

Nowadays, the residential sector of Kazakhstan accounts for about 30% of the total energy consumption. Therefore, it is essential to analyze the energy estimation model for residential buildings in Kazakhstan so as to reduce energy consumption. This research is aimed to develop the Overall Thermal Transfer Value (OTTV) based Building Energy Simulation Model (BESM) for the reduction of energy consumption through the envelope of residential buildings in seven cities of Kazakhstan. A brute force optimization method was adopted to obtain the optimal envelope configuration varying window-to-wall ratio (WWR), the angle of a pitched roof, the depth of the overhang shading system, the thermal conductivity, and the thicknesses of wall composition materials. In addition, orientation-related analyses of the optimized cases were conducted. Finally, the economic evaluation of the base and optimized cases were presented. The results showed that an average energy reduction for heating was 6156.8 kWh, while for cooling it was almost 1912.17 kWh. The heating and cooling energy savings were 16.59% and 16.69%, respectively. The frontage of the building model directed towards the south in the cold season and north in the hot season demonstrated around 21% and 32% of energy reduction, respectively. The energy cost savings varied between 9657 to 119,221 ₸ for heating, 9622 to 36,088 ₸ for cooling.

scholarly journals Box Girder Optimization by Orthogonal Experiment Design and GA-BP Algorithm in the Gondola Car Body

Processes ◽  
2021 ◽  
Vol 10 (1) ◽  
pp. 74
Author(s):  
Wenfei Liu ◽  
Yuming Wang ◽  
Tianyou Wang
Keyword(s):  
Experimental Design ◽  
Orthogonal Experiment ◽  
Back Propagation ◽  
Optimization Method ◽  
Bp Algorithm ◽  
Orthogonal Experimental Design ◽  
Combined Method ◽  
Element Analysis ◽  
Box Girder ◽  
Car Body

Box girder is an important bearing and force transmitting component in the gondola car body; the rationality of its structure directly affects the life of the whole car body. In order to solve disadvantage of the traditional box girder optimization method, which mainly depends on design experience, the combined method of orthogonal experimental design and the genetic algorithm-back propagation (GA-BP) algorithm is used for the structural optimization of bolster beam in this paper. Nine groups of parameters were established by orthogonal experiment, which can give typical samples for GA-BP optimization. Then, the bolster beam is optimized by the GA-BP algorithm, and the new gondola car body model is established with the optimized parameters. The finite element analysis results show that the minimum stress is found by using the GA-BP algorithm, which is basically consistent with the simulation results. Finally, the results show that the combined method of orthogonal experimental design and GA-BP algorithm is feasible to the box girder optimization of the gondola car body. Meanwhile, the optimization results of bolster beam will provide a reference for the structural design of the heavy haul wagon body.

CASE STUDY OF THE OPERATIONAL ENERGY CONSUMPTION AND CARBON EMISSIONS FROM A BUILDING IN NANJING BASED ON A SYSTEM DYNAMICS APPROACH

2016 ◽  
Vol 11 (3) ◽  
pp. 126-142
Author(s):  
Changhai Peng ◽  
Jianqiang Yang ◽  
Jinfu Huang
Keyword(s):  
Energy Consumption ◽  
System Dynamics ◽  
Carbon Emissions ◽  
Office Building ◽  
Qualitative And Quantitative ◽  
Operational Energy ◽  
The Difference ◽  
Global Energy Consumption ◽  
Sd Model

Buildings are responsible for more than forty percent of global energy consumption and as much as one third of global greenhouse gas emissions. Meanwhile, the energy conservation and exhaust reduction of a building can be easily understood by accurately calculating a building's carbon emissions during its operational stage. In the present study, a system dynamics (SD) approach to calculate the energy consumption and carbon emissions from a building during its operational stage is quantitatively developed through a case study on an office building in Nanjing. The obtained results demonstrate that: a) the difference between the results of SD and that of EnergyPlus is so small that a SD approach is acceptable; b) the variation between the real monitored data and that of simulation by SD and EnergyPlus is reasonable; c) the physical meanings of the variables in the SD model are clear; d) the parameters of the SD model and the relationships between the variables can be determined by a qualitative-and-quantitative combined analysis.

Are green offices better than conventional?

Facilities ◽  
2017 ◽  
Vol 35 (11/12) ◽  
pp. 622-637 ◽  
Author(s):  
Suzaini M. Zaid ◽  
Amir Kiani Rad ◽  
Nurshuhada Zainon
Keyword(s):  
Energy Consumption ◽  
Environmental Impact ◽  
Carbon Emissions ◽  
Green Buildings ◽  
Energy Performance ◽  
Office Building ◽  
Performance Gap ◽  
Content Type ◽  
Operational Energy ◽  
Better Than

Purpose Global warming and climate change is one of the biggest issues facing humanity in this century; its effects are felt on the highest peaks of Mount Everest to the low-lying islands in the India Ocean. This century marked the highest amount of carbon dioxide (CO2) emitted, breaking records of the past 650,000 years, and we have pushed the climate to “a point of no return”. Much of the climate contribution has been linked to humanity’s thirst for higher living standards and lifestyle, which has led to higher consumerism, depletion of earth’s resources, production of massive waste and carbon emissions. Fast forward from the sustainability agenda of Brundtland set in 1987 and the increasing demand for energy consumption to cater for the current global inhabitants, many “green” efforts have been taken by the building industry to reduce the overall environmental impact. This purpose of this study is to compare energy performance of a conventional office building with a green certified building. Design/methodology/approach This paper tries to bridge the performance gap by comparing measured operational energy consumption and carbon emission of Green Building Index (GBI)-certified office buildings in Kuala Lumpur, to determine whether “green buildings” are performing as intended in reducing their environmental impact. Findings This paper highlighted and compared operational energy consumption and carbon emissions of a GBI-certified office with a conventional office building in Malaysia. The paper also discusses the performance gap issue and its common causes, and aims to compare predicted energy and operational energy performance of buildings. Originality/value Initiatives such as “green” or “sustainable” design have been at the forefront of architecture, while green assessment tools have been used to predict the energy performance of a building during its operational phase. There is still a significant performance gap between predicted or simulated energy measurements to actual operational energy consumption. The need to measure actual performance of these so-called “green buildings” is important to investigate if there is a performance gap and whether these buildings can perform better than conventional buildings. Understanding why the performance gap occurs is a step in reducing actual and predicted energy performance in buildings.

Multi-Criteria Analysis of Material Compositions of External Walls

2013 ◽  
Vol 664 ◽  
pp. 485-490 ◽  
Author(s):  
Monika Čuláková ◽  
Silvia Vilčeková ◽  
Eva Kridlova-Burdova ◽  
Jana Katunská
Keyword(s):  
Energy Consumption ◽  
Building Envelope ◽  
Embodied Energy ◽  
Correct Selection ◽  
Physical Parameters ◽  
Building Structures ◽  
Total Energy Consumption ◽  
Operational Energy ◽  
High Reduction ◽  
Whole Life Cycle

Intensity of building development increases by growing population and their requirements on living. Buildings belong to the largest energy consumers and greenhouse gases emitters. Current energy strategy of European Union is focused especially on reduction of operational energy of buildings. Although operational energy participates the highest proportion in total energy consumption over whole life cycle of building, it is important to take into account embodied energy. Values of embodied energy and associated emissions grow by improving energy quality of building envelope by using extra components and insulation materials. This paper demonstrates significance of correct selection of materials in order to environmental and energy optimalization of building structures. The designed material compositions of external wall alternatives are evaluated by methodology LCA and also in the view of impact on future energy consumption though thermal-physical parameters. Results of assessments are compared by multi-criteria decision analysis. The optimized alternative achieves very low embodied energy (218 MJ/m2) and high reduction of embodied CO2 (-114 kg CO2eq/m2).

Energy Reduction Potential of Biomimetic Building Facades for Different Building Typologies in Different Climate Zones

2021 ◽  
Author(s):  
Matthew Webb
Keyword(s):  
Energy Consumption ◽  
Greenhouse Gas ◽  
Reduction Potential ◽  
Aged Care ◽  
Building Envelope ◽  
Energy Reduction ◽  
Climate Zones ◽  
Building Facades ◽  
Operational Energy ◽  
Reduce Energy Consumption

Abstract Greenhouse gas (GHG) emissions leading to anthropogenic global warming continue to be a major issue for societies worldwide. One opportunity to reduce emissions is to improve the effectiveness of building envelope, leading to a decrease in operational energy consumption. Improving the performance of a building's thermal envelope can substantially reduce energy consumption from heating, ventilation and air conditioning while maintaining occupant comfort. In previous work, a computational model of a biomimetic building façade design was found to be effective in temperate climates in an office context. This paper tests the hypothesis that biomimetic building facades have a broader application through a case study example based on animal fur and blood perfusion. Using mathematical modelling and digital simulation methods, the energy reduction potential of the biomimetic façade was tested in a set of operational applications (office, school and aged care) and across different climate zones (tropical, desert, temperate, and cool continental). Results indicated that the biomimetic façade has potential to reduce energy consumption for all building applications, with the greatest benefit shown in residential aged care (67.1% reduction). Similarly, the biomimetic building façade showed potential to reduce operational services energy consumption in all climate zones, with the greatest energy reductions achieved in the tropical (55.4% reduction) and humid continental climates (55.1% reduction). Through these results the hypothesis was confirmed, suggesting that facades engineered to mimic biological functions and processes can improve substantially decrease building operational energy consumption and can be applied in different building classifications and different climate zones. Such facades can contribute to the further reduction of greenhouse gas emissions in a broad range of contexts. This study also exemplified a method by which other biomimetic building envelope features may be assessed. Further work is suggested to assess economic viability and constructability of the proposed facades.

Sign in / Sign up

Export Citation Format

Share Document