Abdullahi Mohammed Usman and Kamil Abdullah
The purpose of this study is to develop a set of parameters universally acceptable for assessing design and construction strategies for reducing operational energy usage and its…
Abstract
Purpose
The purpose of this study is to develop a set of parameters universally acceptable for assessing design and construction strategies for reducing operational energy usage and its associated greenhouse gas (GHG) emission. Also, the parameters are intended to estimate the quantity of energy and its associated GHG emission reduction over the assessment period.
Design/methodology/approach
This study used five steps framework comprising definition of purpose, selecting the candidate parameters, criteria selection and description, selecting proposed parameters and defining the proposed parameters. The criteria used were the parameter’s prevalence, measurability, preference and feasibility toward adaptability to the relevant stakeholders.
Findings
This study consolidated 11 parameters. Seven cover designs and construction strategies comprising energy monitoring, natural lighting and ventilation design. Others are building thermal performance, efficient equipments, renewable energy and energy policy. The remaining four consider operational energy consumption, GHG emission quantification and their reduction over time.
Practical implications
Providing suitable indicators for assessing direct and indirect GHG emission with easily accessible data is essential for assessing built environment. The consolidated parameters can be used in developing rating systems, monitoring GHG inventories and activities of building related industries.
Originality/value
This study was conducted at the CEIES UTHM and used 11 existing rating systems open for research purposes, International Panel for Climate Change reports and GHG protocol report and guides and several other standards.
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Rehan Zahid, Masjuki Hj. Hassan, Abdullah Alabdulkarem, Mahendra Varman, Md. Abul Kalam, Riaz Ahmad Mufti, Nurin Wahidah Mohd Zulkifli, Mubashir Gulzar, Muhammad Usman Bhutta, Mian Ashfaq Ali, Usman Abdullah and Robiah H. Yunus
There is a continuous drive in automotive sector to shift from conventional lubricants to environmental friendly ones without adversely affecting critical tribological performance…
Abstract
Purpose
There is a continuous drive in automotive sector to shift from conventional lubricants to environmental friendly ones without adversely affecting critical tribological performance parameters. Because of their favorable tribological properties, chemically modified vegetable oils such as palm trimethylolpropane ester (TMP) are one of the potential candidates for the said role. To prove the suitability of TMP for applications involving boundary-lubrication regime such as cam/tappet interface of direct acting valve train system, a logical step forward is to investigate their compatibility with conventional lubricant additives.
Design/methodology/approach
In this study, extreme pressure and tribological characteristics of TMP, formulated with glycerol mono-oleate (GMO), molybdenum dithiocarbamate (MoDTC) and zinc dialkyldithiophosphate (ZDDP), has been investigated using four-ball wear tester and valve train test rig. For comparison, additive-free and formulated versions of polyalphaolefin (PAO) were used as reference. Moreover, various surface characterization techniques were deployed to investigate mechanisms responsible for a particular tribological behavior.
Findings
In additive-free form, TMP demonstrated better extreme pressure characteristics compared to PAO and lubricant additives which are actually optimized for conventional base-oils such as PAO, are also proved to be compatible with TMP to some extent, especially ZDDP. During cylinder head tests, additive-free TMP proved to be more effective compared to PAO in reducing friction of cam/tappet interface, but opposite behavior was seen when formulated lubricants were used. Therefore, there is a need to synthesize specialized friction modifiers, anti-wear and extreme pressure additives for TMP before using it as engine lubricant base-oil.
Originality/value
In this study, additive-free and formulated versions of bio-lubricant are tested for cam/tappet interface of direct acting valve train system of commercial passenger car diesel engine for the very test time. Another important aspect of this research was comparison of important tribological performance parameters (friction torque, wear, rotational speed of tappet) of TMP-based lubricants with conventional lubricant base oil, that is, PAO and its formulated version.
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Waseem Arshad, Muhammad Adnan Hanif, Muhammad Usman Bhutta, Riaz Ahmad Mufti, Samiur Rahman Shah, Muhammad Usman Abdullah and Muhammad Huzaifa Najeeb
This paper aims to present a technique that has been developed to study the wear in the camshaft and tappet. The engine manufacturers use the most suitable materials, lubrication…
Abstract
Purpose
This paper aims to present a technique that has been developed to study the wear in the camshaft and tappet. The engine manufacturers use the most suitable materials, lubrication additives and surface coatings to minimize friction in all the components of the engine. Reduced friction results in less wear of critical engine components. The researchers are constantly trying to find an improved lubrication formula which reduces the wear and friction coefficient at a considerably low price. In this regard, the cam follower interface is of much importance because most of the wear occurs in this interface.
Design/methodology/approach
The tappets and the cam lobes are analyzed to determine wear. A two-dimensional optical surface profilometer is used to measure the tappet wear, and a high-resolution linear variable differential transformer is used for the measurement of cam lobes. Tests are conducted on Mercedes Benz engine OM 646 under constant camshaft speed, constant inlet lubricant temperature and constant lubricant pressure to study the oil rheology on cam tappet wear.
Findings
The results show that the wear occurs on the cam tappet interface, which is almost a linear phenomenon, and it increases with use.
Originality/value
Customized jigs were made to measure wear of camshaft and tappet.
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Kamil Abdullah and Abdullahi Mohammed Usman
The purpose of the study is to consolidate a set of indicators for assessing design and construction phase strategies for reducing operational greenhouse gas (GHG) emission. They…
Abstract
Purpose
The purpose of the study is to consolidate a set of indicators for assessing design and construction phase strategies for reducing operational greenhouse gas (GHG) emission. They will also estimate the quantity of operational GHG emission and its associated reduction over assessment period.
Design/methodology/approach
Five steps framework adopted include defining the purpose of the indicators and selection of candidate indicators. Others are defining the criteria for indicator selection, selecting and defining the proposed indicators. Relevancy, measurability, prevalence, preference, feasibility and adaptability of the indicator were the criteria used for selecting the indicators.
Findings
The study consolidated public transport accessibility, sustainable parking space, green vehicle priority, proximity to amenities and alternative modes as indicators for design and construction phase strategies. Transportation accounting and carbon footprint (CFP) and their associated reduction are indicators for operational GHG emission while plan and policy is an indicator for policymakers and stakeholders.
Practical implications
The study shows that providing correct indicators for assessing direct and indirect GHG emission with easy to obtain data is essential for assessment of built environment. Stakeholder can use the indicators in developing new rating systems and researchers as an additional knowledge. Policy makers and stakeholders can use the study in monitoring and rewarding the sustainability and activities of building related industries and organisations.
Originality/value
The study was conducted at the Center for Energy and Industrial Environmental Studies (CEIES) Universiti Tun Hussein Onn Malaysia and utilises existing rating systems and tools, Intergovernmental Panel on Climate Change (IPCC) and GHG protocol reports and guides and several other standards, which are open for research.
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Muhammad Ali Asadullah, Usman Abdullah and Ahmad Siddiquei
This diary study tested some propositions to determine the effect of discrete emotions on three dimensions of emotional labor and their consequent effect on leaders and follower’s…
Abstract
Purpose
This diary study tested some propositions to determine the effect of discrete emotions on three dimensions of emotional labor and their consequent effect on leaders and follower’s perception about leaders’ authenticity.
Design/Methodology/Approach
The data were collected from a cohort of city traffic police consisting 69 police officials at four different time points between their two shifts using experience sampling method. The data were analyzed using the latest technique known as latent growth curve modeling.
Findings
The statistical results demonstrated that negative emotions were negatively associated with deep-acting and three forms of emotional labor did not significantly affect followers’ perception about leaders’ authenticity. This study also demonstrated that surface-acting is not significantly associated with leaders’ self-perceived authenticity, but genuine-acting and deep-acting were negatively associated with leaders’ self-perceived authenticity.
Research Limitations/Implications
This study also offers certain implications for policing officials for improve authentic behavior through daily emotional displays in policing organizations.
Practical Implications
This study offers some practical implications for policing officials about emotion regulation strategies during policing practices with respect to the authentic sense of the leaders as well as the followers.
Originality/Value
This study offers an insight about how emotional labor affects the perceptions of policing officers about the authenticity of their leaders in the context of traffic police.
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Flexibility is known as an important term in the field of open buildings especially during modern era. Idea of flexibility has been one of the prominent implications in…
Abstract
Flexibility is known as an important term in the field of open buildings especially during modern era. Idea of flexibility has been one of the prominent implications in traditional Iranian architecture emerged in spatial organizations. Although, during modern period this quality of spaces has been mostly ignored some of the contemporary architects attempted to reconsider this characteristic in their projects. However, providing an interview with 7 pioneering contemporary Iranian architects and visiting their 25 residential projects it seems that flexibility has been reinterpreted in some of their projects. This research is an attempt for examining the idea of flexibility in 6 projects of 3 of these architects who were obsessed with this spatial term in their architectural works. Based on the architect’s words and analysis of their projects, and also looking for the roots of flexibility in traditional architecture, it can be asserted that there is an authentic emergence of flexibility in these projects. Examining these projects according to three main indicators of flexibility in modern architecture as structural systems, service organization and architectural layout, it is also tried to find their relation with traditional architecture. Being adapted with new lifestyles while ingrained in cultural and environmental issues of its context, idea of flexibility employed as an authentic characteristic of spatial configuration in some of the contemporary buildings in Iran.
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Augustine Senanu Komla Kukah, Xiaohua Jin, Robert Osei-Kyei and Srinath Perera
While operational carbon (OC) emission reduction strategies have received substantial attention in past literature, very few studies have focused on embodied carbon (EC) emission…
Abstract
Purpose
While operational carbon (OC) emission reduction strategies have received substantial attention in past literature, very few studies have focused on embodied carbon (EC) emission reduction in the construction industry. Therefore, this study aims at undertaking a scientometric review of strategies to mitigate EC emissions in the construction industry.
Design/methodology/approach
Scopus search engine was used to search for articles. VOSViewer software was used for scientometric analysis using science mapping approach. Using a total of 151 documents, keywords, authors, papers and their sources were analysed. Furthermore, scientometric analysis was undertaken comprising co-occurrence of keywords, documents source analysis and author co-citation analysis.
Findings
The significant strategies identified to mitigate EC emissions were: offsite manufacturing/use of prefabricated elements, decarbonisation of energy grid, enhanced policies and regulations by governments, construction sector policies and regulations, guidelines for increased use of low EC materials and reuse and recovery of EC construction materials.
Practical implications
This study identifies practical strategies that contribute to reduction of EC emissions.
Originality/value
This study is significant and contributes to the construction industry’s agenda to mitigate greenhouse gas emissions.
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Qinghao Zeng and Pardis Pishdad
This research aims to analyze the evolution of sustainable building rating tools in the United States of America over approximately 30 years. It analyzes the shift from addressing…
Abstract
Purpose
This research aims to analyze the evolution of sustainable building rating tools in the United States of America over approximately 30 years. It analyzes the shift from addressing purely environmental concerns to embracing a holistic approach that includes economic and social considerations.
Design/methodology/approach
By conducting a comprehensive literature review and analysis, this research systematically examines the differences among sustainable building rating tools (SBRTs). It establishes a decision-making support framework for stakeholders based on existing literature, standards and emerging trends.
Findings
Expected findings include insights into the evolution and distinctions among SBRTs. The research is expected to reveal the progression of SBRTs from purely focusing on environmental dimensions to exploring a broader scope that includes economic and social dimensions. The decision-making support framework and forward-looking perspective aim to guide stakeholders in tool selection and offer insights for future developments.
Research limitations/implications
The focus of this research primarily centers on SBRTs, which originated in the United States of America, thereby excluding famous global tools such as BREEAM and CASBEE. Therefore, the research outcomes are particularly appropriate to the context of the United States of America. In addition, specific indicators within the general indicators system are not entirely independent of each other, leading to interrelationships between different indicators during the evaluation process. Moreover, in terms of data availability, the early versions of various SBRTs suffered from information gaps, potentially introducing ambiguity in the description of specific indicators, which could influence the weighting results.
Originality/value
This research contributes original perspectives by offering a nuanced understanding of the dynamic nature of sustainable building practices. The decision-making support framework adds practical value, assisting stakeholders in selecting diverse certification options. It also contributes to the original body of knowledge by providing insights for future developments in sustainable building practices and certifications.
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Maria Unuigbe, Sambo Lyson Zulu and David Johnston
Challenges to energy access in Nigeria have resulted in the widespread use of fossil fuel generating sets (generators) despite its renewable energy (RE) potential. Given the…
Abstract
Purpose
Challenges to energy access in Nigeria have resulted in the widespread use of fossil fuel generating sets (generators) despite its renewable energy (RE) potential. Given the climate crisis, combined with the country's rapid population growth and expected rise in energy and building demand, transitioning to low-carbon electricity using REs like solar photovoltaic (PV) presents opportunities beyond securing its energy future. While PV use is growing in Nigeria, this is focused on the residential sector despite the identification of the commercial sector as a high energy consumer and a key platform for its integration. In line with this, this research aims to investigates the challenges to energy transitioning from generators to solar PV in commercial buildings.
Design/methodology/approach
A qualitative approach in line with grounded theory was adopted using in-depth face-to-face interviews with industry experts.
Findings
Two distinct but interrelated categories emerged: being held captive and being a saviour that represented a duality of systems, and/or processes formed the core category “Hostage Syndrome”. The core category (theory) was generated based on the explanations and expressions by participants about their concerns, interests, and the conditions under which they operate. The findings reveal the value attributed to generators beyond an operational role and the adjustments or mechanisms adopted by building professionals during their practice. It suggests a sphere of influence beyond the obvious financial and/or institutional aspects, as determining factors to what is viewed as sustainable which will be key to transitioning to REs.
Originality/value
This paper provides new and in-depth insight into understanding the conditions under which building professionals operate associated with their interpretations of “being sustainable”. The study highlights the need to consider psychological and cultural factors in the development of interventions, strategies and/or policies to support RE transition, particularly towards achieving a sustainable construction industry.