Operational Phase Of Building Research Articles

Development of a framework to track life safety levels of occupants in the event of a fire in buildings

ABSTRACT In the operational phase of buildings, tracking what modifications can have an impact on the expected facility performances through manual checks can be impractical, albeit very important from a facility management perspective. The transition from the traditional prescriptive method towards the performance-based approach for building design and management may facilitate quantitative assessment of performances and may lead to conscious decisions which includes preparedness in the event of emergencies. The main goal of this paper is to develop a framework, compliant with a Building Information Modelling (BIM) environment, to track fire safety performance levels, in terms of life safety of occupants. As long as this is done through the definition of Key Performance Indicators (KPIs) that are being tracked continuously, facility managers can have a comprehensive and updated overview of current performances of a facility. More specifically, a single representative KPI was set and evaluated for several fire scenarios, using a set of simulation and data management tools. The results of the assessment were processed and transformed into a visual representation, referenced to a grid superimposed over the building layout to quantitatively represent the safety of occupants at every point of the building. The results were then sent back and displayed into the BIM model, for seamless accessibility by facility managers. The proposed methodology was tested on a pilot building, assuming two fire scenarios. This approach enabled supervision of a building’s compliance with fire safety requirements, in terms of occupants’ life safety, throughout the building lifecycle.

Novel STAttention GraphWaveNet model for residential household appliance prediction and energy structure optimization

The multifaceted challenge of carbon dioxide (CO2) emissions during building operations, construction, and material production perpetuates energy shortages and climate adversities. Urgent imperatives underscore the need for effective energy reduction and carbon mitigation, driving the building sector toward a paradigm shift in clean, low-carbon evolution. However, the complex multidimensional and nonlinear characteristics of influencing factors of building energy consumption make it difficult in precisely understanding the spatial and temporal relationships between the features in the predictive modeling of buildings. Therefore, a novel Graph Wavenet (GWN) based on the spatio-temporal attention fusion mechanism (STA-GWN) is proposed for spatio-temporal graph prediction modeling of structures, which can capture hidden spatial relationships using an adaptive dependency matrix. To overcome the drawbacks of standard predefined adjacency matrices and their inability to capture faraway dependencies, a spatio-temporal attention fusion mechanism is introduced to extract latent spatio-temporal features dynamically. By combining extracted features, building energy consumption can be predicted more precisely. Moreover, the proposed model becomes more interpretable, making it easier to reveal how spatio-temporal features relate to building energy consumption. Lastly, the proposed method is applied to energy conservation and emission reduction in the building industry. A predictive model for electrical energy consumption during two public datasets with an operational phase of buildings is established to analyze and optimize energy utilization in residential structures that rely on electricity. The experimental results demonstrate that the STA-GWN model surpasses other deep learning methods in terms of prediction accuracy and robustness. Moreover, the proposed model can offer optimal solutions for building energy processes, reducing approximately 201.44 kg (Kg) and 64.08 Kg of CO2 emissions in the appliances energy prediction dataset and the individual-household-electric-power-consumption (IHEPC) dataset, respectively.

Comparative analysis of residential building decarbonization policies in major economies: insights from the EU, China, and India

The global building sector, responsible for over 30% of CO2 emissions, necessitates urgent decarbonization efforts. This paper examines residential building decarbonization policies in three major economies—the European Union (EU), China, and India. It provides an overview of diverse policies through policy landscape analysis and delves into the design specifics with a detailed policy intensity analysis of building energy codes, information disclosure, and financial incentives in each region. Our findings reveal a diverse mix of policies targeting residential building decarbonization in all three regions. While the EU and China have long-established diverse policy instruments, India's building energy efficiency policies are relatively recent and limited. Detailed analyses of building energy codes, information disclosure, and financial incentives expose variations in ambition, scope, and implementation, even with shared policy instruments. Significant advancements in building energy codes, particularly in stringency and compliance checks, are evident in the EU and China. Conversely, India faces a notable obstacle with limited adoption of residential building energy codes, impacting its journey towards net-zero. The EU leads in building energy labelling policies, while China and India encounter various challenges hindering widespread implementation. Financial incentives across the three regions predominantly take the form of subsidies, potentially straining public budgets. The study concludes with reflections on the pressing need for future research extending beyond the operational phase of buildings.

An integrated life cycle assessment and energy simulation framework for residential building walling systems

Designing building wall systems is a multi-criteria problem characterised by a complex interplay of variables that drive long-term energy and environmental performance. Achieving holistic sustainability outcomes will require the application of life cycle thinking to the design and evaluation of building walling systems. However, the aspiration for minimising operational and embodied energy and mitigating the environmental impacts requires conflicting strategies. Therefore, this study proposes a comprehensive, integrated life cycle and energy simulation (ILES) methodology for analysing different walling systems of residential buildings in India and Australia. This method involves performing a process-based life cycle assessment to compute the environmental impacts of various walling materials, followed by energy modelling to evaluate the performance of these materials in the operational phase of buildings in combination with embodied energy analysis, which accounts for energy consumption during the material manufacturing phases. The results reveal that insulated cavity-clay masonry or concrete walls with extruded polystyrene are favourable Australian walling options, while metal cladding-based walling systems have significant environmental and energy burdens. For India, autoclave aerated block, fly ash bricks, and concrete block-based walling systems are recommended, while reinforced concrete and clay brick walls exhibit significant environmental and energy burdens. This study also advocates the consideration of supply chains in mitigating Scope 3 emissions from building walling systems in residential buildings.

Energy assessment of advanced and switchable windows for less energy-hungry buildings in the UK

Globally, greenhouse gas emissions from the operational phase of buildings are significantly contributing towards climate change. Global and national efforts, through the Sustainable Development Goals and the UK's 2050 targets, aim to reduce these emissions with net zero energy buildings (NZEBs). A building's glazing plays a significant role in overall building energy consumption due to their traditionally ‘leaky’ nature. This study utilises experimental data from test cells and the International Glazing Database to evaluate the performance of advanced and smart/switchable windows on an existing low energy building (LEB) situated in north Wales, UK, as a step towards making the modelled building a NZEB. A number of glazing constructions were considered in this work; advanced window – vacuum, aerogel, vacuum-aerogel and smart window – PDLC, PDLC-aerogel and PDLC-vacuum, in their fixed and switching states. Results revealed that PDLC-vacuum offered the greatest reduction in building energy, yielding a theoretical U-value of 0.810–0.831 W/m2K and a G-value of 0.257–0.455. Despite its successes, it was notably susceptible to window orientation and window-to-wall ratio. Vacuum and aerogel glazing both offered similar energy savings, with the latter prone to overheating, stressing cooling loads. These advanced windows offered differing daylighting potential with vacuum able to meet 78% of useful daylight illuminance compared to aerogel's 60%. Given the prioritisation trilemma between heating, lighting and cooling needs of a building, PDLC-vacuum presents the best step towards a NZEB. As such, further efforts should concentrate on the development of a PDLC-vacuum window, maintaining smart window functionality and achieving low U-value for cold climates.

Clustering and analysis of air source heat pump air heater usage patterns of inhabitants in Qinghai-Tibet Plateau areas

Occupant behavior is one of the most important factors influencing the level of energy consumption in the operational phase of buildings. The unique climatic conditions of the Qinghai-Tibetan plateau differ from those of lower altitude areas. Therefore, to specifically investigate the characteristics of the active heating behavior of the inhabitants of these areas, four households are selected for this study. Each is equipped with a corresponding Air Source Heat Pump Air Heater (ASHP-AH) as their only heating equipment. The occupants' usage patterns and active regulating patterns are analyzed explicitly by clustering the ASHP-AH operational data of four households during the heating season using the K-means algorithm. The use of different time steps to reduce the dimensionality of the data and reduce the time and space complexity of the K-means algorithm in clustering is also discussed, and the Preference Cumulative Value (PCV) and Change Direction Frequency (CDF) are proposed to evaluate changes in the clustering results. These results are potentially relevant to improving energy efficiency in relation to occupant behavior.

Strategies and way forward of low carbon construction in Malaysia

ABSTRACT The need for a paradigm shift to achieve low carbon construction is becoming increasingly apparent. Nonetheless, most existing publications have focused on lowering emissions during the operational phase of buildings, emphasizing the need for improved emissions management during construction. Thus, this study aims to investigate industry behaviours and practices and recommend strategies to improve low carbon in construction. The triangulation of information in this study was supported by observations of eight construction sites, expert interviews and responses from 79 respondents involved in construction projects. The findings suggest that limited investment and budget, resistance to change, lack of knowledge and experience on low-carbon technologies are the key impediments to effective carbon reduction strategies. The main determinants of behavioural change and industrial commitment to low carbon practices are boosting financial and economic value, strengthening institutional capacity development, establishing credible policy, promoting awareness, and expanding resources and skills. The findings of this paper may benefit construction stakeholders in identifying specific hurdles to low-carbon implementation and developing appropriate strategies to promote low-carbon development in Malaysia. This research contributes to the current knowledge about the industry’s behaviour and practice in emissions management and the significant challenges and drivers connected with low-carbon growth in developing countries.

Carbon emissions management in construction operations: a systematic review

PurposeThe demand to reduce carbon emissions has become an increasingly important social factor due to the unprecedented impacts of climate change. However, most existing publications have focused on minimizing emissions during the operational phase of buildings. At the same time, there is a lack of comprehensive research conducted on carbon emissions, specifically during the construction phase. The purpose of this paper is to identify, review and classify current practices related to carbon emissions management in construction operations to gain greater insight into how to reduce and mitigate emissions and achieve more sustainable solutions.Design/methodology/approachThis study reviewed the published literature on carbon emissions from construction. A total of 198 bibliographic records were extracted from the Scopus collection database and analyzed using Preferred Reporting Items for Systematic Review and Meta-Analyses (PRISMA). PRISMA is used as a basis for reporting possible trends, research methods and strategies used in published literatures. A total of 99 papers related to carbon emissions in the construction operations were further reviewed and analyzed. This review paper draws on existing research and identifies current carbon management patterns in construction projects.FindingsData indicated an upward trend in the number of publications in carbon emissions research during the last few years, particularly in 2015, 2017 and 2019. The most significant contributions to the domain were reported from China, Europe and the USA. This paper found that most studies conduct the Life Cycle Assessment (LCA) method to estimate carbon emissions. This paper found that the primary studies have focused on construction machinery and equipment emissions. The strategies such as establishing uniform standards for carbon emissions policies and regulations, equipment and logistic planning and low carbon design material will potentially impact carbon emissions reductions.Practical implicationsThis paper provides information that will be beneficial for the construction industry to design and manage construction operations. It will also be of interest to those looking to reduce or manage construction emissions.Originality/valueAlthough there is a diversity of current thinking related to the practical estimation and management of carbon emissions in construction projects, there is no consolidated set of keys of standardized carbon emissions management in practice. By assessing the existing paradigms of carbon assessment methods and tactics in the construction industry, this study contributed to the existing knowledge base by providing insights into current techniques in the construction sector for monitoring and mitigating emissions.

Experimental Evaluation of Energy-Efficiency in a Holistically Designed Building

The building sector continues to register a significant rise in energy demand and environmental impact, notably in developing countries. A considerable proportion of this energy is required during the operational phase of buildings for interior heating and cooling, leading to a necessity of building performance improvement. A holistic approach in building design and construction represents a step to moderate construction costs in conjunction with reduced long-term operating costs and a low impact on the environment. The present paper presents an experimental evaluation of the energy efficiency of a building under real climate conditions; the building, which represents a holistically designed modular laboratory, is located in a moderate continental temperate climate, characteristic of the south-eastern part of the Pannonian Depression, with some sub-Mediterranean influences. Considerations for the holistic design of the building, including multi-object optimization and integrated design with a high regard for technology and operational life are described. The paper provides a genuine overview of the energy efficiency response of the building during six months of operational use through a monitored energy management system. The energetic analysis presented in the paper represents an intermediary stage as not all the energetic users were installed nor all the energetic suppliers. However, the results showed a reliable thermal response in the behaviour of recycled-PET thermal wadding used as insulation material in the building and for the intermediary stage in which the building has only secondary energy users, the energetic balance proves its efficiency, keeping the buffer stock of energy high values over 90%.

Potential Application of Blockchain Technology for Embodied Carbon Estimating in Construction Supply Chains

Carbon emissions are categorised as Embodied Carbon (EC) occurring in the production phase and Operational Carbon (OC) occurring in the operational phase of buildings. The current focus on producing zero-carbon buildings, emphasises reducing OC and ignores the importance of reducing EC emissions. This study focuses on EC. Methods available in EC estimating currently produce estimates that often do not complement each other. This makes it important to develop a robust and accurate methodology for estimating EC. Blockchain is an emerging technology that has significant potential for transaction processing in supply chains. The construction industry being the second least digitalised industry, the adoption of innovative technologies is predominantly important. This paper explores the potential application of blockchain for accurate estimation of EC in construction supply chains. A detailed literature review and expert interviews revealed that, compared to traditional information systems, blockchain systems could eliminate issues in EC estimating highlighting its potential credible application for EC estimating. Scalability was identified as a feature that was lacking in a blockchain system, however, for EC estimating, its impact was identified as minimal. It will be difficult to generalise the findings of the study due to interview based qualitative methodology adopted in this study along with the fact that blockchain is an emerging and fairly new technology. However, a similar process could be followed by other studies to compare blockchain with traditional information systems, to evaluate the suitability of blockchain technology to develop prototype systems.

Development of Maintenance-Reparation Guidance, and Material Specification for Green Building’s Electrical Component in Government Building Based on Work Breakdown Structure (WBS)

Initial quality of building depands on quality of design and construction phase of the building, while maintenance and spare part quality keep the decline of the quality during operational phase of building within level of service needed. Electrical aspect of building has an impact of the building’s purpose, safety, and comfort. Several finding in operation phase have been found regarding lack of quality of electrical maintenance process and spare part material such as fire incident, waste of electricity and exesive stock of spare part. Thus, it’s important to not only develop maintenance and reparation guidelines of electrical work but also it’s material specification to keep the required level of service. The purpose of this study is to use work breakdown structure (WBS) methods as a proven method in decomposition to develop maintenance and reparation guidelines, as well as the material specifications in green building. The research methodology covers several stages: literature studies, information from previous projects, and delphi techniques through expert validation in green building electrical components. The results of this study are expected to create applicable guidelines for maintenance and reparation work of electrical component and it’s material specification to eliminate or decrease finding of electrical issues in building operational.

Rethinking social housing: Behavioural patterns and technological innovations

The building sector accounts for 40% of energy use and 25% of CO2 emissions, mainly due to inefficient building practices and energy consumption during the operational phase of buildings. Social housing accounts for a significant proportion of the European building stock and about 50% of the existing buildings are likely to require large-scale renovations in the coming years, meeting the current EPBD directive. This could represent an opportunity to renovate the affordable building stock, often characterized by premature disrepair, resulting in a bad perception from inhabitants and community. Significant European experiences have already shown the importance of an integrated approach finalized to the construction or renovation of social housing, leveraging on environmental sustainability, creating urban identity, adopting measures to face social disadvantage, offering at the same time quality housing standard. In this regard, it seems necessary to match technological advancements and knowledge in energy retrofitting with social needs and habits. The implementation of energy-efficiency improvements in social housing requests support and participation of the final energy consumer. The paper investigates how to deal with knowledge gaps in the relationship between retrofit technologies and users’ behaviour and possible strategic measures to increase awareness between tenants through two case studies.

The convergence of life cycle assessment and nearly zero-energy buildings: The case of Germany

Abstract This paper presents the historical development and background of life cycle assessment (LCA) and nearly zero-energy buildings in Germany. In order to plan and build responsibly for the future, it is necessary to have an overview of the topic at hand. Final energy demand during the operational phase of buildings has fallen steadily. According to European Union guidelines (2010/31/EU), starting in 2021 new buildings must achieve the nearly zero-energy standards. These buildings will have very low operational energy demand. As a consequence of this requirement, the relative impact of construction and disposal increases in terms of the entire life cycle. This is also the case currently for buildings with low operational energy demand. The research – based on a literature analysis and review – shows that LCA has existed since the 1970s as a tool to judge potential environmental impacts. Moreover, the energy building standards in Germany have developed continuously since 1977. This process will continue in the new German Energy Saving Ordinance in 2014, which will be tightened even further in 2016. As LCA is well established and sustainable buildings are becoming increasingly common, the next indispensable step is to consider the life cycle view of nearly zero-energy buildings.

Practical Greenhouse Gas Reduction Strategies for the Existing Building Stock

This paper aims to illustrate building Greenhouse Gas (GHG) and energy trends, and to provide practical strategies to lower GHG emissions, energy use and operating costs, across building types and Australian Climate Zones. It provides international best practice examples of building refurbishments, and of government policies and important stakeholder behaviour, and evaluates one recent project for strategies that proved successful and those that could be improved. The method used was to review international strategies that lower building GHG emissions in countries with more advanced building regulations than Australia, and to discover affordable and effective strategies from associations that publicise case studies. This paper shows that the operational phase of buildings is a significant contributor to global GHG emissions; that Passive building refurbishments are current world's best practice strategies for most climates and building types; and that human behaviour is a significant contributor to GHG emissions. It has also identified particular strategies for building stakeholders to minimise GHG emissions.

Strategies for Practical Greenhouse Gas Reductions in the Existing Building Stock

The Stern Report found that Climate Change is the world's greatest market failure, and the United Nations concluded it is likely to be the most significant environmental challenge of our time. This paper aims to illustrate building Greenhouse Gas (GHG) and energy trends, and to provide practical strategies and best practice examples in international low- and high-rise building refurbishments to lower GHG emissions, energy use and operating costs, across building types and Australian Climate Zones. These can be adopted by policy-makers, owners, investors and occupiers. It also aims to provide examples of government policies and important stakeholder behaviour to reduce GHGs, and evaluates one recent project for strategies that proved successful and those that could be improved. The method used was to review international strategies that lower building GHG emissions in countries with more advanced building regulations than Australia, and to discover affordable and effective strategies from associations that publicise case studies. This paper shows that the operational phase of buildings is a significant contributor to global GHG emissions; that Passive building refurbishments are current best practice strategies; and that occupant behaviour is another surprisingly significant contributor to GHG emissions. The paper forms part of the author's higher research degree literature review.