scholarly journals SYSTEM DYNAMICS APPROACH FOR WHOLE LIFE CYCLE COST MODELLING OF RESIDENTIAL BUILDING PROJECTS IN UNITED ARAB EMIRATES

2021 ◽  
Vol 6 (1) ◽  
pp. 49-71
Author(s):  
Ahmed Sadek
Keyword(s):  
Life Cycle ◽  
System Dynamics ◽  
United Arab Emirates ◽  
Residential Buildings ◽  
Residential Building ◽  
Information Value ◽  
Estimation Accuracy ◽  
Unique Contribution ◽  
Cost Modelling ◽  
Whole Life Cycle

Purpose – Project management field is experiencing many challenges to maintain its performance within planned budget. Latest research focused on cost modelling and estimation. The significance of cost modelling comes from the forecasted information value. It is needed in the United Arab Emirates to satisfy the future vision and strategies. Methodology – This article aims to model project's whole life cycle costs of residential buildings in UAE at the preconstruction stage, choosing VENSIM system dynamics approach. The objective is to simulate dynamically cost over time for all outputs. The approach of this research is pure quantitative. It requires mapping diagrams and mathematical computation systems. DEMO simulation and real data verification modelling are used to ensure the outputs’ validity. The mean absolute deviation and mean square error are used for measuring the estimation accuracy. Findings – This research proved that VENSIM system dynamics approach can model and estimate residential building project’s cost and cash flow dynamically through time, with high accuracy, in the United Arab Emirates. Unique contribution to theory, practice and policy – This research provides the first cost estimation modelling for residential projects’ whole life cycle using VENSIM system dynamics approach. It is opening new research opportunities in cost modelling and estimating fields. The theoretical-implications, practical-implications, and limitations are presented in the conclusion for future research. 

scholarly journals COST RISK’S RELIABILITY AND VALIDITY OF RESIDENTIAL BUILDING PROJECT’S WHOLE LIFE CYCLE IN THE UNITED ARAB EMIRATES

2021 ◽  
Vol 6 (1) ◽  
pp. 90-114
Author(s):  
Ahmed Sadek
Keyword(s):  
Life Cycle ◽  
Project Management ◽  
United Arab Emirates ◽  
Life Cycle Cost ◽  
Reliability And Validity ◽  
Residential Building ◽  
Future Research ◽  
Unique Contribution ◽  
Risk Modelling ◽  
Whole Life Cycle

Purpose – Project management cost and risk modelling is experiencing the challenge of identifying cost risks values to maintain accurate modelling, estimating, and assessment. Latest research focused on cost and risk modelling and estimation. The significance of cost risks numerical values come from its ability to be used in many different analysis and approaches. This article aims to identify residential building projects’ whole life cycle cost risks numerical values in UAE at the preconstruction stage and ensure its reliability and validity. Methodology – The approach of this research is pure quantitative. The methodology of this research is to collect data though conducting face-to-face interviews quantitatively (i.e., cost risks values). The survey is using PMBOK risk matrix (i.e., probability vs. impact). Finally, data correlation and regression modelling ware done to ensure the reliability and validity of each cost risk value. Findings – This paper was able to deliver reliable and valid residential project’s whole life cycle cost risks values (i.e., 117 cost risks) for direct use in future research or practical professional cost analysis. Unique contribution to theory, practice and policy – This article contribution to the project management body of knowledge is to collect all relevant cost risks (i.e., 117 cost risks) and obtain their values from UAE field experts for the first time. The provided values are for residential project in UAE only. The perspective of how to look to cost risks values in this article (i.e., contractors’ and clients’ views) should be considered at the time of using the data. The consultancy services organizations will have different cost risks because they do not deal with delivering the final product, but they provide supporting services (i.e., design and supervision) to facilitate delivering the project.

scholarly journals MONTE-CARLO APPROACH FOR MEASURING ADJUSTING COST RISKS VALUES OF RESIDENTIAL BUILDING PROJECT’S WHOLE LIFE CYCLE FROM CLIENTS’ PERSPECTIVE IN THE UNITED ARAB EMIRATES

2021 ◽  
Vol 6 (1) ◽  
pp. 72-89
Author(s):  
Ahmed Sadek
Keyword(s):  
Monte Carlo Simulation ◽  
Monte Carlo ◽  
United Arab Emirates ◽  
Monte Carlo Model ◽  
Residential Building ◽  
Statistical Modelling ◽  
Future Research ◽  
Unique Contribution ◽  
Monte Carlo Approach ◽  
Whole Life Cycle

Purpose – Although projects’ experts always take into consideration the related cost-risks. They are experiencing the challenge of not being able to finish the project within the estimated budget. Latest cost-risks studies concentrated on modelling and estimating risks at the preconstruction stage. This article aims to approach Monte-Carlo simulation using stochastic mathematical modelling to measure cost-risks error (i.e., adjusting cost-risks). Methodology – The approach of this research is solely quantitative. It is using statistical modelling and simulations to ensure the accuracy and precision of the developed Monte-Carlo model. However, this study is utilizing Microsoft Office Excel Software Mersenne twister algorithm to generate random numbers to ensure most accurate Monte-Carlo approach. The mathematical equations system is built into Excel. Findings – The research outputs are considered significant in project management body of knowledge. This is because of the resulted evidence that is proving the applicability to measure cost risks error using Monte-Carlo simulation. This study presented cost risks and differentiated between contractors’ and clients’ views.    Unique contribution to theory, practice and policy – The originality of this article comes from providing the first Monte-Carlo approach for measuring projects’ cost-risks error from client’s perspective. The theoretical-implications, practical-implications, and limitations are presented in the conclusion for future research.

scholarly journals LIFE CYCLE ASSESSMENT OF TECHNICAL BUILDING SERVICES OF LARGE RESIDENTIAL BUILDING STOCKS USING SEMANTIC 3D CITY MODELS

2020 ◽  
Vol VI-4/W1-2020 ◽  
pp. 85-92
Author(s):  
H. Harter ◽  
B. Willenborg ◽  
W. Lang ◽  
T. H. Kolbe
Keyword(s):  
Life Cycle Assessment ◽  
Life Cycle ◽  
Energy Demand ◽  
Residential Buildings ◽  
Residential Building ◽  
Building Stock ◽  
3D City Models ◽  
Methodical Approach ◽  
Operational Energy ◽  
City Models

Abstract. Reducing the demand for non-renewable resources and the resulting environmental impact is an objective of sustainable development, to which buildings contribute significantly. In order to realize the goal of reaching a climate-neutral building stock, it must first be analyzed and evaluated in order to develop optimization strategies. The life cycle based consideration and assessment of buildings plays a key role in this process. Approaches and tools already exist for this purpose, but they mainly take the operational energy demand of buildings and not a life cycle based approach into account, especially when assessing technical building services (TBS). Therefore, this paper presents and applies a methodical approach for the life cycle based assessment of the TBS of large residential building stocks, based on semantic 3D city models (CityGML). The methodical approach developed for this purpose describes the procedure for calculating the operational energy demand (already validated) and the heating load of the building, the dimensioning of the TBS components and the calculation of the life cycle assessment. The application of the methodology is illustrated in a case study with over 115,000 residential buildings from Munich, Germany. The study shows that the methodology calculates reliable results and that a significant reduction of the life cycle based energy demand can be achieved by refurbishment measures/scenarios. Nevertheless, the goal of achieving a climate-neutral building stock is a challenge from a life cycle perspective.

Research on Construction for Sustainable Housing Based on the Whole Life Cycle

2011 ◽  
Vol 224 ◽  
pp. 164-169
Author(s):  
Xia Yun Li ◽  
Shi Qiang Zhao
Keyword(s):  
Sustainable Development ◽  
Life Cycle ◽  
Development Strategy ◽  
Construction Projects ◽  
Residential Building ◽  
Paper Analysis ◽  
Low Carbon ◽  
Low Carbon Economy ◽  
Sustainable Housing ◽  
Whole Life Cycle

Under the Sustainable Development Strategy, whether the project's sustainability goals can be achieved for residential building is a serious problem, which is not only related to the improvement of quality of living but also the implementation of the strategy for national energy saving and low-carbon economy. However, building sustainable housing is a new challenge for contractor. Based on the life cycle theory, this paper analysis project objective and achieves condition of sustainable development in explaining the basis of the connotation of sustainable housing, and then discuses the process of building sustainable housing under the guidance of sustainable management theory, which can provides some guidance for the achievement of sustainability goals of residential construction projects.

scholarly journals The Analysis of Variants of Water Supply Systems in Multi-Family Residential Building

2015 ◽  
Vol 21 (4) ◽  
pp. 623-635 ◽  
Author(s):  
Daniel Słyś ◽  
Agnieszka Stec
Keyword(s):  
Life Cycle ◽  
Water Supply ◽  
Life Cycle Cost ◽  
Rainwater Harvesting ◽  
Residential Building ◽  
Water Supply Systems ◽  
Municipal Water ◽  
The World ◽  
Whole Life Cycle ◽  
Supply Systems

Abstract Climate change, improper use of water resources, surface waters pollution as well as increase of water requirements are the results of growing population of people in the world. It causes water deficiency in majority of countries in the world, including Poland. Due to the water pollution advanced technologies for its treatment are in demand, what leads to increase of water price. In this connection, there are more often taken actions to reduce water consumption by using rainwater to flush toilets, wash cars, do laundry or water green areas. This publication presents results of Life Cycle Cost analysis of two variants of water supply systems designed for multi-family residential building situated in Rzeszow. In line with LCC methodology the calculations were made throughout the whole life-cycle of the building considering initial investment outlays intended for construction of water supply system as well as operation and maintenance costs. In the first of analyzed variants it was assumed that the system would be fed by municipal water supply network. In the second variant rainwater harvesting system for domestic use was additionally applied. Rainwater stored in the tank would be used in sanitary installation to flush toilets, what leads to lowering the costs of municipal water purchase, reducing fees for rainwater discharge to sewage system and consequently is beneficial for financial standing of the examined building.

scholarly journals A Methodology for Energy Simulation of Risedential Buildings: A Case Study for Amman

2018 ◽  
Vol 1 (1) ◽  
pp. 772-781
Author(s):  
Ahmad Altarabsheh ◽  
Ibrahim Altarabsheh ◽  
Sara Altarabsheh ◽  
Nisreen Rababaa ◽  
Ayat Smadi ◽  
...  
Keyword(s):  
Life Cycle ◽  
Life Cycle Cost ◽  
Residential Buildings ◽  
Green Building ◽  
Green Buildings ◽  
Zero Energy ◽  
Zero Energy Building ◽  
Net Zero ◽  
Whole Life Cycle ◽  
Zero Energy Buildings

Green buildings have been gaining in popularity over the past few years in Jordan. This is attributed to environmental and financial reasons directly related to energy consumption and cost. Energy sector in Jordan faces two main challenges which are the fast growing of energy demand and the scarcity of resources to fulfill this demand. Green buildings can save energy by designing them as near Zero Energy Buildings, where they produce amount of energy almost equal the amount of energy they consume. In special cases green buildings can be designed as Net zero energy buildings, where they produce as much energy as they consume. Jordan government encourage people to adopt net zero green buildings by issuing the Renewable Energy and Energy Efficiency Law No. 13 of 2012, that allows selling excessive electricity to electricity companies. Despite these benefits of green buildings, they are not yet the norm in the building sector in Jordan. This can be attributed to the high construction cost of green building compared to traditional one. However, this may not be true if the whole life cycle cost of the building is considered, in which the cost not only include design and construction but also operation and maintenance as well. This paper aims to provide real life cycle cost analysis for a typical residential building in Jordan, and to search different effective building strategies and design scenarios that will lead to a successful near Zero Energy Building. The search will apply main green building strategies recommended for Jordan climatic zone. The outcome of this study is a list of best economically feasible design solutions and system selections that result in near Zero Energy Building in Jordan for residential buildings.

scholarly journals Improving the analysis of technical risk factors using the integrated FLDS model on the example of the construction of multi-storey residential buildings

Vestnik MGSU ◽  
2021 ◽  
pp. 1608-1619
Author(s):  
Azariy A. Lapidus ◽  
Otari D. Chapidze
Keyword(s):  
Risk Factors ◽  
Mathematical Model ◽  
Life Cycle ◽  
Construction Industry ◽  
Residential Buildings ◽  
Residential Building ◽  
Point Of View ◽  
Technical Risk ◽  
Technical Risks ◽  
Main Factors

Introduction. This study is aimed at developing a model of the life cycle of a multi-storey residential building, taking into account the factors of technical risks. This model makes it possible to identify the main factors of technical risks at different stages of a project’s life and predict its behavior. After examining an extensive list of both domestic and foreign literature, it is clear that the systematization and classification of the elements of the life cycle of a construction object in conditions of technical risk factors is an urgent task in the construction industry. The purpose of the study is to develop the most effective mathematical model for determining and predicting the influence of technical risk factors on the life cycle of a multi-storey residential building. Materials and methods. The study is based not only on an extensive review of scientific literature, whose attention is focused on technical risks, but also analyzed the stages of the life cycle of buildings and structures, used the method of analogies and the method of diagrams, based on the theory of fuzzy set and the Dempster-Schafer theory, a mathematical model of FLDS is formed, so an expert survey was conducted with leading experts in the construction industry, on the basis of which the selection of the main factors of technical risks is formed. Results. The problem of analyzing technical risks in the construction industry plays a significant role, this is due to the construction of a significant number of modern structures that are unique in their kind, both from an architectural point of view, and from the point of view of the originality of design and technological solutions. Conclusions. Due to the uncertainty of experts’ opinions regarding the likelihood of occurrence and the degree of impact of risk factors, a demonstrative mathematical model of FLDS based on two theories is proposed, which allows numerically determining and distributing the influence of a risk factor by ranks. The result of the study shows that the application of the FLDS mathematical model will significantly increase the success of the project, allowing you to see the critical factors of technical risks at the initial stage of the life cycle of a construction project.

scholarly journals Comprehensive Evaluation of Carbon Emissions for the Development of High-Rise Residential Building

Buildings ◽  
2018 ◽  
Vol 8 (11) ◽  
pp. 147 ◽  
Author(s):  
Stephen Yim ◽  
S. Ng ◽  
M. Hossain ◽  
James Wong
Keyword(s):  
Hong Kong ◽  
Life Cycle ◽  
Carbon Emissions ◽  
Comprehensive Evaluation ◽  
Ghg Emissions ◽  
Residential Building ◽  
Low Carbon ◽  
Residential Housing ◽  
High Rise ◽  
Whole Life Cycle

Despite the fact that many novel initiatives have been put forward to reduce the carbon emissions of buildings, there is still a lack of comprehensive investigation in analyzing a buildings’ life cycle greenhouse gas (GHG) emissions, especially in high-density cities. In addition, no studies have made attempt to evaluate GHG emissions by considering the whole life cycle of buildings in Hong Kong. Knowledge of localized emission at different stages is critical, as the emission varies greatly in different regions. Without a reliable emission level of buildings, it is difficult to determine which aspects can reduce the life cycle GHG emissions. Therefore, this study aims to evaluate the life cycle GHG emissions of buildings by considering “cradle-to-grave” system boundary, with a case-specific high-rise residential housing block as a representative public housing development in Hong Kong. The results demonstrated that the life cycle GHG emission of the case residential building was 4980 kg CO2e/m2. The analysis showed that the majority (over 86%) of the emission resulted from the use phase of the building including renovation. The results and analysis presented in this study can help the relevant parties in designing low carbon and sustainable residential development in the future.

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