scholarly journals Impact of indoor environmental quality on students' wellbeing and performance in educational building through life cycle costing perspective

2018 ◽  
Vol 204 ◽  
pp. 298-309 ◽  
Author(s):  
Xin Shan ◽  
Anastasia Nissa Melina ◽  
En-Hua Yang
Keyword(s):  
Life Cycle ◽  
Environmental Quality ◽  
Life Cycle Costing ◽  
Indoor Environmental Quality ◽  
And Performance

scholarly journals Life Cycle Assessment and Indoor Environmental Quality of Wooden Family Houses

2020 ◽  
Vol 12 (24) ◽  
pp. 10557
Author(s):  
Silvia Vilčeková ◽  
Katarína Harčárová ◽  
Andrea Moňoková ◽  
Eva Krídlová Burdová
Keyword(s):  
Life Cycle Assessment ◽  
Life Cycle ◽  
Environmental Quality ◽  
Concrete Structures ◽  
Actual State ◽  
Indoor Environmental Quality ◽  
Suitable Alternative ◽  
Wooden Frame ◽  
The Creation ◽  
The Impact

This article analyzes in detail the impact of wooden houses on the environment using the life cycle assessment (LCA) methodology and at the same time evaluates the indoor environmental quality (IEQ) in these houses. The investigated detached family houses had a wooden structure. The first one had a bearing system made of a wooden frame; other materials were conventional. The second house was built entirely of log wood. Given the high risk of greenhouse gas emissions, the concentration of which in the atmosphere is causing global climate change, the global warming potential (GWP) indicator is crucial. According to results, the family house built entirely of wood and with a biomass boiler significantly reduces CO2 emissions and is therefore considered from the LCA point of view as a more suitable alternative compared to a house with a wooden frame structure. The building materials with the highest share involved in the creation of GWP include concrete structures (38–48%), ceramic roof tiles (33%) and plasterboard (15%). Plasterboard cladding (55%), concrete structures (17–19%), oriented strand board OSB (9–22%), impregnated wooden structures (31–52%) and plastic windows (9%) are the most involved in acidification potential (AP) and eutrophication potential (EP). Plasterboard structures (21%), impregnated wood materials (47.4%), reinforced concrete structures (12%) and mineral wool and roof tiles significantly contribute to the creation of photochemical ozone creation potential (POCP) and ozone depletion potential (ODP). The indoor environmental quality was evaluated through short-term measurements of basic physico-chemical parameters. Since both houses have different characteristics, the aim of this monitoring was to evaluate the actual state of IEQ in selected wooden houses under real conditions. Based on the recorded results, it can be stated that neither presented wooden house, in terms of thermal-humidity microclimate, concentration of CO2 and particulate matter, represents an environment with a negative impact on their occupants. With regards to volatile organic compounds (VOCs), the increased concentrations of xylenes and tetrachlorethylene in the log house were probably caused by the application of impregnation and protective coatings six months before monitoring. In this case, the concentration of tetrachloroethene, which is considered a potential carcinogen, was six times higher than the legislative limit. For VOCs, such as limonene, isobutylene and n-butylacetate, which were found in the wooden frame house, no limits are set. The legislative limits for xylenes and tetrachlorethylene in this house have not been exceeded, and therefore the IEQ cannot yet be considered harmful for health. The presence of all the mentioned VOCs in the interior air of the wooden frame house is more related to the activities of occupants, as this house has been inhabited for several years.

scholarly journals LIFE CYCLE COSTING IN CONSTRUCTION: CURRENT TRENDS AND EMERGING DIRECTIONS

2021 ◽  
Author(s):  
Anupa Manewa ◽  
◽  
Mohan Siriwardena ◽  
Christaline Wijekoon ◽  
◽  
...  
Keyword(s):  
Life Cycle ◽  
Life Cycle Costing ◽  
Current Status ◽  
Total Cost Of Ownership ◽  
Current Trends ◽  
Cost Of Ownership ◽  
Integrated Methodology ◽  
Construction Strategy ◽  
And Performance ◽  
The Uk

The current construction climate in the UK is moving forward with a much greater attention on cost certainty, sustainability and adoption of innovative technologies. The UK Construction Strategy 2025 provides a clear direction towards achieving such goals by 2025. Life Cycle Costing (LCC) is one of successful techniques for identifying the total cost of ownership in construction assets. Even though the technique has 50 years of history, the application and the diffusion of the technique within the construction domain is comparatively limited. Therefore, this study aims to investigate the evolution and current status of LCC within construction context through Bibliometric Analysis of journal publications indexed in Web of Science database (1970-2020). A series of Contents Analyses was performed and visualisation maps were generated via VOSviewer. The findings proved that LCC has been absorbed into construction in late 90’s and there is a continuous rise in the global uptake from 2013 onwards. With limited budgets and growing demand for sustainability, an integrated methodology linking LCC, Life Cycle Assessment and Performance optimisation is apparently the way forward for LCC.

Forecasting “Wooden Round” Reliability During Preliminary Design

1987 ◽  
Author(s):  
H. Weaks
Keyword(s):  
Life Cycle ◽  
Life Cycle Costing ◽  
Turbine Engines ◽  
Preliminary Design ◽  
Design Phase ◽  
Weapon Systems ◽  
And Performance ◽  
The Impact

The USAF’s R&M 2000 policy emphasizes the integration of reliability and maintainability considerations into a system’s preliminary design phase. This emphasis leads to unique requirements for turbine engines, including those of “wooden rounds” such as a HARPOON type missiles. In particular, it requires the development of tools for assessing the impact of design iterations on the reliability of “wooden round” weapon systems. Such tools must account for design iterations impact on storage, captive carry and launch reliability. A Markov approach is described in this paper, which provides an ability to track the reliability of a fleet of missiles/engines on a period by period basis, allowing one to assess when scheduled maintenance is appropriate and what components require such maintenance. Thus, inputs for Life Cycle Costing are generated, as well as the ability to determine tradeoffs between R&M and performance.

Research on Comfort Performance of Green Building and Conventional Building

2013 ◽  
Vol 312 ◽  
pp. 822-825
Author(s):  
Na Li
Keyword(s):  
Life Cycle ◽  
Cost Effectiveness ◽  
Work Environment ◽  
Environmental Quality ◽  
Green Building ◽  
Green Buildings ◽  
Indoor Environmental Quality ◽  
Development Costs

t has been argued that green buildings have a better indoor environmental quality than conventional buildings and that this translates into a more satisfying workplace for the building's occupants and, inturn, a more productive workforce. Assessing a building's cost effectiveness means taking into account all the costs that will be incurred during its life cycle not just development costs. People found no evidence to believe that green buildings are more comfortable than conventional building. In fact, the only difference between the buildings was that occupants of the green building were more likely to perceive their work environment as warm, and occupants who felt warm were more likely to describe their work environment as poor.

scholarly journals Factors Affecting Occupants’ Satisfaction in Governmental Buildings: The Case of the Kingdom of Bahrain

Buildings ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 231
Author(s):  
Noora Albuainain ◽  
Ghaleb Sweis ◽  
Wassim AlBalkhy ◽  
Rateb Sweis ◽  
Zoubeir Lafhaj
Keyword(s):  
Environmental Quality ◽  
Working Hours ◽  
Indoor Environmental Quality ◽  
Air Conditioner ◽  
Factors Affecting ◽  
Open Plan ◽  
Central Air Conditioning ◽  
And Performance ◽  
Visual Privacy ◽  
The Impact

Satisfaction is a very important factor in improving productivity and performance in the work environment. This study aims to investigate the levels of occupants’ satisfaction with the indoor environmental quality (IEQ) in the governmental buildings in the Kingdom of Bahrain and to investigate the impact of occupants’ demographics and building attributes (non-IEQ factors) on these levels. For these purposes, the study used a questionnaire that has 17 indoor environmental quality (IEQ) factors in addition to a group of non-IEQ factors. The questionnaire was distributed by hand or using email to 279 employees in the Bahraini governmental sector. The findings of the study revealed that occupants in the Bahraini governmental buildings are not strongly satisfied with IEQ factors, especially with sound privacy, followed by visual privacy and amount of space, and then noise levels. The findings also showed that for most IEQ factors, men are more satisfied than women are, those who work in enclosed private offices are more satisfied than those who work in open-plan offices, and those who have central air-conditioning at their workplace are more than those who have a wall-mounted air conditioner. The impact of age, nature of work, duration of working in the current building and at the current workstation, weekly working hours, and proximity to the window were also investigated. Accordingly, a group of recommendations was suggested aiming to improve the levels of occupants’ satisfaction.

scholarly journals Parameters and indicators used in Indoor Environmental Quality (IEQ) studies: a review

2021 ◽  
Vol 2042 (1) ◽  
pp. 012132
Author(s):  
Muriel Diaz ◽  
Maria Beatriz Piderit ◽  
Shady Attia
Keyword(s):  
Environmental Quality ◽  
Research Area ◽  
Systemic Approach ◽  
Integrated Analysis ◽  
School Buildings ◽  
Indoor Environmental Quality ◽  
Broad Concept ◽  
Educational Spaces ◽  
And Performance

Abstract Indoor environmental quality (IEQ) is a broad concept, which seeks to define when a built space provides welfare to its occupants. In general, it is defined as the condition of thermal, visual, acoustic and air quality comfort and depends on multiple factors. In the case of school buildings, the relevance of IEQ is related to its effects on the wellbeing, health and performance of the students and teachers. This research summarizes previous studies of IEQ from a multivariable perspective to prove that this research area needs to be further developed. Previous results show that an integrated analysis of IEQ parameters could better understand the IEQ perception of their occupants. Research on IEQ in schools generally refers to one or two aspects of the four. Even the most recent research deals with these topics separately, without using a systemic approach. The reductionism generated by isolating parameters allows us to study a parameter in detail but does not evaluate the environmental quality of the space. This is why new metrics are necessary to describe, assess and compare IEQ in educational spaces under a systemic approach.

scholarly journals Performance Assessment of Green Rated Built Environment using Post Occupancy Evaluation

2019 ◽  
Vol 8 (4) ◽  
pp. 1449-1454
Keyword(s):  
Energy Efficiency ◽  
Life Cycle ◽  
Built Environment ◽  
Environmental Quality ◽  
Green Building ◽  
Quality Parameters ◽  
Indoor Environmental Quality ◽  
Habitat Assessment ◽  
Performance Parameters ◽  
Post Occupancy Evaluation

Green Rating Certification is one of the important mechanism developed in last few decades worldwide to achieve sustainability in Built Environment life cycle. The early generations of Green Rated Built Environment from India have occupied for several years now. Therefore, it has become inevitable to assess whether these Built Environment are living up to expectations in their objective terms. Post Occupancy Evaluation is a process of systematic monitoring of Building's performance with predefined parameters and objectives after it is occupied for few years. Present research focuses on assessment of Green Rated Built Environment on the basis of performance parameters. Indoor Environmental Quality (IEQ) and Energy Efficiency are two performance parameters identified for current research. Seven Green Rated Institutional/office projects have been selected for Post Occupancy Evaluation. Indian Green Building Council (IGBC) has rated three projects and Green Rating for Integrated Habitat Assessment (GRIHA) has rated remaining four buildings. All seven projects are located in warm and humid climatic zone of India. Questionnaire Survey, on site measurement of Indoor Environmental Quality parameters and Energy consumption records are selected as a tool to measure performance of Green rated project.

scholarly journals LIFE CYCLE ASSESSMENT AND SHORT-TERM MEASUREMENTS OF INDOOR ENVIRONMENTAL QUALITY OF A WOODEN FAMILY HOUSE

2020 ◽  
Author(s):  
Silvia Vilčeková ◽  
Katarína Harčárová ◽  
Andrea Moňoková ◽  
Eva Krídlová Burdová
Keyword(s):  
Life Cycle Assessment ◽  
Life Cycle ◽  
Environmental Impacts ◽  
Environmental Quality ◽  
Energy Performance ◽  
Physical Parameters ◽  
Indoor Environmental Quality ◽  
Short Term ◽  
Family House

Nowadays, there is an increased trend in the construction of nearly zero energy buildings which can be also characterized as green buildings. Several studies confirm that wooden buildings fulfil these requirements. However, there is no detailed research related to the quality of the indoor environment in new wooden family houses. For this reason, this paper focuses on monitoring of the indoor environmental quality in a selected wooden family house. Short-term measurements are aimed at investigation of physical parameters (air temperature, relative humidity, air velocity and noise) and chemical factors such as concentrations of particulate matters and CO2. At the same time, environmental impacts were also assessed for impact categories such as: global warming potential (GWP), ozone depletion potential (ODP) acidification potential (AP), eutrophication potential (EP), photochemical ozone creation potential (POCP) ex-pressed as kilogram CO2eq, CFC11eq, SO2eq, PO43–eq and kilogram of C2H4eq within “Cradle to Grave” boundary by using the life cycle assessment (LCA) method. The main contribution of this study is demonstration that wooden build-ings have substantial share in the reduction of environmental impacts. So far, results indicate that the design of wooden houses correspond with the increasing demands of occupants in terms of environmental, social and energy performance.

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