Indoor Environmental Quality (IEQ) Acceptance of Air Conditioned Buildings in Malaysia: Case Study of Universiti Tenaga Nasional

2014 ◽  
Vol 953-954 ◽  
pp. 1513-1519 ◽  
Author(s):  
Iman Asadi ◽  
Ibrahim Hussein ◽  
Kumaran Palanisamy
Keyword(s):  
Environmental Quality ◽  
Indoor Air ◽  
Linear Regression Analysis ◽  
Carbon Dioxide Concentration ◽  
Environmental Parameters ◽  
Physical Parameters ◽  
Indoor Environmental Quality ◽  
Physical Measurements ◽  
Guidelines And Standards ◽  
The Moment

Indoor environmental quality (IEQ) is an important topic which impacts on energy efficiency and also productivity of occupants. Thermal comfort, indoor air quality, visual comfort and aural comfort are four main physical parameters which are normally used to determine IEQ. In this paper, the results of field study on IEQ conducted in the offices and student study areas of 6 air conditioned buildings in Universiti Tenaga Nasional in Malaysia are presented. The study was conducted during the month of October and November 2013, collecting a full set of objective physical measurements and subjective assessments through questionnaires. The measured environmental parameters are indoor air temperature, relative humidity, air velocity, carbon dioxide concentration, sound pressure level and luminance. The subjective responses concern the judgment of the respondents about the IEQ parameters at the moment of measurements. The results obtained showed that 86% of the respondents found that the IEQ is acceptable and the environmental conditions are mainly within the limits set by the various guidelines and standards in Malaysia. The neutral IEQ values were also determined through linear regression analysis of the sensation votes.

Analysis on Thermal Comfort of Air-Conditioned Buildings in Malaysia: Case Study of Universiti Tenaga Nasional

2014 ◽  
Vol 672-674 ◽  
pp. 1665-1669 ◽  
Author(s):  
Iman Asadi ◽  
Ibrahim Hussein ◽  
Kumaran Palanisamy
Keyword(s):  
Thermal Comfort ◽  
Air Temperature ◽  
Thermal Environment ◽  
Thermal Sensation ◽  
Linear Regression Analysis ◽  
Environmental Parameters ◽  
Thermal Conditions ◽  
Physical Measurements ◽  
Subjective Assessments ◽  
The Moment

Field study was carried out on the thermal conditions and thermal comfort of occupants in air conditioned buildings in Malaysia. The study was carried out in 10 staff offices and 6 student study areas of Universiti Tenaga Nasional (UNITEN) during October and November 2013, collecting a full set of objective physical measurements and subjective assessments through questionnaires. The measured environmental parameters were air temperature, relative humidity and air velocity. The subjective responses concern the judgment of the occupants about the thermal environment at the moment of measurements. The obtained results showed that most places are in acceptable and comfort zone according to Fanger’s predicted mean vote (PMV) model. The neutral air temperature obtained through linear regression analysis of thermal sensation vote (TSV) is 23.9°C for UNITEN. The result of this study demonstrates that the acceptability of thermal comfort among UNITEN occupant is about 78 %.

THE IMPACT OF THE INDOOR ENVIRONMENTAL QUALITY ON STUDENTS’ PERFORMANCE

2021 ◽  
Author(s):  
Tania Rus ◽  
Dorin Beu ◽  
Calin Ciugudeanu
Keyword(s):  
Carbon Dioxide ◽  
Environmental Quality ◽  
Current Knowledge ◽  
Carbon Dioxide Concentration ◽  
Environmental Parameters ◽  
Field Measurements ◽  
Well Being ◽  
Indoor Environmental Quality ◽  
Key Factor ◽  
The Impact

"The indoor environment quality is a key factor in people's lives, which directly affects their comfort, performance, health and well-being. The main factors that contribute to the indoor environmental quality are thermal comfort, air and lighting quality and acoustics. This study aims to extend the current knowledge on the impact of IEQ on students’ performance. Field measurements on environmental factors were performed in two similar classrooms, with the same number of students engaged in a written examination. Compliance of the indoor environmental parameters with the current standards regulations was performed. Students’ performance was quantified by their exam grades. The results of the field measurements show that, in both classrooms, the acoustics and air quality do not fulfil the standard regulations, especially in the case of carbon dioxide concentration which exceeds a lot the threshold limit of 1000 ppm. The outcomes of the study also reveal that in the classroom where the concentration of carbon dioxide is higher, the students scored lower grades, therefore we can conclude that indoor environmental quality has an impact on students’ performance."

scholarly journals How Can We Adapt Thermal Comfort for Disabled Patients? A Case Study of French Healthcare Buildings in Summer

Energies ◽  
2021 ◽  
Vol 14 (15) ◽  
pp. 4530
Author(s):  
Youcef Bouzidi ◽  
Zoubayre El Akili ◽  
Antoine Gademer ◽  
Nacef Tazi ◽  
Adil Chahboun
Keyword(s):  
Thermal Comfort ◽  
Thermal Environment ◽  
Residential Buildings ◽  
Linear Regression Analysis ◽  
Environmental Parameters ◽  
Physical Parameters ◽  
Mean Radiant Temperature ◽  
Operative Temperature ◽  
Neutral Temperature ◽  
Radiant Temperature

This paper investigates adaptive thermal comfort during summer in medical residences that are located in the French city of Troyes and managed by the Association of Parents of Disabled Children (APEI). Thermal comfort in these buildings is evaluated using subjective measurements and objective physical parameters. The thermal sensations of respondents were determined by questionnaires, while thermal comfort was estimated using the predicted mean vote (PMV) model. Indoor environmental parameters (relative humidity, mean radiant temperature, air temperature, and air velocity) were measured using a thermal environment sensor during the summer period in July and August 2018. A good correlation was found between operative temperature, mean radiant temperature, and PMV. The neutral temperature was determined by linear regression analysis of the operative temperature and Fanger’s PMV model. The obtained neutral temperature is 23.7 °C. Based on the datasets and questionnaires, the adaptive coefficient α representing patients’ capacity to adapt to heat was found to be 1.261. A strong correlation was also observed between the sequential thermal index n(t) and the adaptive temperature. Finally, a new empirical model of adaptive temperature was developed using the data collected from a longitudinal survey in four residential buildings of APEI in summer, and the obtained adaptive temperature is 25.0 °C with upper and lower limits of 24.7 °C and 25.4 °C.

Short-term Measurements of Indoor Environmental Quality in Selected Offices – Case Study

2017 ◽  
Author(s):  
Ludmila Meciarova ◽  
Silvia Vilcekova ◽  
Eva Kridlova Burdova ◽  
Ilija Zoran Apostoloski ◽  
Danica Kosicanova
Keyword(s):  
Environmental Quality ◽  
Indoor Air ◽  
Indoor Environmental Quality ◽  
Indoor Climate ◽  
Climate Conditions ◽  
Healthy Environment ◽  
Health And Wellbeing ◽  
The One

Decent quality of indoor air is important for health and wellbeing of building users. We live, work and study in indoors of various types of buildings. Often people are exposed to pollutants at higher concentrations than these that occur out-doors. Continual investigation of indoor air quality is needed for ensuring comfort and healthy environment. Measuring and analysis of occurrence of physical, chemical and biological factors is the first step for suggestion of optimization measures. Inside school buildings there are often inadequate indoor climate conditions such as thermal comfort parame-ters or ventilation. The aim of this study was determination of indoor environmental quality in selected offices in the building of elementary school in Slovakia. The values of operative temperature were not within the optimum range of values for the warm period of the year in one of the monitored offices. The intensity of illumination was lower in the two offices. Low levels of particulate matters were measured except the one office where permissible value was exceeded by 7.6%.

Evaluation of an indoor environmental quality model for very small residential units

2018 ◽  
Vol 28 (4) ◽  
pp. 470-478 ◽  
Author(s):  
Kwok Wai Mui ◽  
Tsz Wun Tsang ◽  
Ling Tim Wong ◽  
Yuen Ping William Yu
Keyword(s):  
Environmental Quality ◽  
Residential Buildings ◽  
Residential Building ◽  
Environmental Parameters ◽  
Small Variation ◽  
Indoor Environmental Quality ◽  
Quality Model ◽  
Small Unit ◽  
Residential Units ◽  
The One

This study investigates the indoor environmental quality (IEQ) responses from occupants living in very small residential units that are unique to Hong Kong. Through the changes in environmental parameters, including thermal, indoor air quality, visual and aural, the study demonstrates that the overall IEQ acceptance in these units is different from the one in general residential building environments. Results show that occupants of these units are more sensitive to warmth and operative temperature change as compared to occupants of general residential buildings. A small variation of thermal acceptance suggests that the small unit occupants have already developed certain degree of tolerance to hot conditions. The adaptation to the reality of a hot environment is also reflected in the overall IEQ acceptance. It is believed that very small space residents have developed tolerance and adaptation to an unchangeable reality, changing environmental conditions does not necessarily alter their acceptance of individual IEQ aspects and overall IEQ.

scholarly journals A Systematic Review on Indoor Environmental Quality in Naturally Ventilated School Classrooms: A Way Forward

2021 ◽  
Vol 2021 ◽  
pp. 1-19
Author(s):  
Nishant Raj Kapoor ◽  
Ashok Kumar ◽  
Chandan Swaroop Meena ◽  
Anuj Kumar ◽  
Tabish Alam ◽  
...  
Keyword(s):  
Environmental Quality ◽  
Indoor Air ◽  
State Of The Art ◽  
Research Direction ◽  
Future Research ◽  
School Buildings ◽  
Indoor Environmental Quality ◽  
Future Research Direction ◽  
Art Practices ◽  
Acoustic Comfort

This review presents the existing state-of-the-art practices of indoor environmental quality (IEQ) in naturally ventilated school buildings and is mainly focused on the components of IEQ like thermal comfort, indoor air quality with ventilation, and visual and acoustic comfort. This article also discusses the impacts of COVID-19 on naturally ventilated school buildings, highlighting the obviousness of dynamic applications that concentrate on reducing COVID-19 effects in naturally ventilated school buildings. The importance of the concerned issues and factors are discussed in detail for future research direction. This review is a step toward the development of the IEQ standard for naturally ventilated school buildings.

scholarly journals Integrated Lighting Efficiency Analysis in Large Industrial Buildings to Enhance Indoor Environmental Quality

2017 ◽  
Author(s):  
Dusan Katunsky ◽  
Erika Dolnikova ◽  
Saeed Doroudiani
Keyword(s):  
Environmental Quality ◽  
Substantial Part ◽  
Physical Parameters ◽  
Indoor Environmental Quality ◽  
Heating And Cooling ◽  
Industrial Buildings ◽  
Industrial Architecture ◽  
Present Part ◽  
Indoor Lighting

The physical parameters related to indoor lighting in large industrial halls in winter and summer periods were analyzed using in situ measurements and computational methods. Here, we present part of our observations from a comprehensive research on indoor environmental quality of industrial halls with the aims of saving energy and providing a comfortable environment for the workers. The results showed that the procedures used for evaluation of residential or office buildings may not be used for industrial buildings. We also observed that the criteria for occupants’ comforts for indoor industrial buildings may differ from those of other kinds of buildings. Based on these results, an adequate attention is required while designing the industrial buildings. For this reason, appropriate evaluation methods and criteria should be created. Manufacturing halls are integral parts of industrial architecture, including buildings for light industries. Workers spend a substantial part of the time indoor; therefore, it is necessary to pay attention to design, construction, and evaluation of internal spaces of buildings and the occupants’ comfort. The focus must be given particularly to heating and cooling, moisture, and lighting microclimate. We present some observations from evaluation of internal environmental quality of industrial halls with priority on daylighting in combination with the integral lighting.

scholarly journals A Wireless Gas Sensor Network to Monitor Indoor Environmental Quality in Schools

Sensors ◽  
2018 ◽  
Vol 18 (12) ◽  
pp. 4345 ◽  
Author(s):  
Alvaro Ortiz Perez ◽  
Benedikt Bierer ◽  
Louisa Scholz ◽  
Jürgen Wöllenstein ◽  
Stefan Palzer
Keyword(s):  
Sensor Network ◽  
Gas Sensor ◽  
Environmental Quality ◽  
Energy Savings ◽  
Environmental Parameters ◽  
Well Being ◽  
Sensor Nodes ◽  
Indoor Environmental Quality ◽  
Monitoring And Control ◽  
And Control

Schools are amongst the most densely occupied indoor areas and at the same time children and young adults are the most vulnerable group with respect to adverse health effects as a result of poor environmental conditions. Health, performance and well-being of pupils crucially depend on indoor environmental quality (IEQ) of which air quality and thermal comfort are central pillars. This makes the monitoring and control of environmental parameters in classes important. At the same time most school buildings do neither feature automated, intelligent heating, ventilation, and air conditioning (HVAC) systems nor suitable IEQ monitoring systems. In this contribution, we therefore investigate the capabilities of a novel wireless gas sensor network to determine carbon dioxide concentrations, along with temperature and humidity. The use of a photoacoustic detector enables the construction of long-term stable, miniaturized, LED-based non-dispersive infrared absorption spectrometers without the use of a reference channel. The data of the sensor nodes is transmitted via a Z-Wave protocol to a central gateway, which in turn sends the data to a web-based platform for online analysis. The results show that it is difficult to maintain adequate IEQ levels in class rooms even when ventilating frequently and that individual monitoring and control of rooms is necessary to combine energy savings and good IEQ.

scholarly journals A Healthy, Energy-Efficient and Comfortable Indoor Environment, a Review

Energies ◽  
2019 ◽  
Vol 12 (8) ◽  
pp. 1414 ◽  
Author(s):  
Paulína Šujanová ◽  
Monika Rychtáriková ◽  
Tiago Sotto Mayor ◽  
Affan Hyder
Keyword(s):  
Indoor Air ◽  
Active Agent ◽  
Building Design ◽  
Physical Parameters ◽  
Building Performance ◽  
Indoor Environmental Quality ◽  
Indoor Environments ◽  
Visual Comfort ◽  
Design Strategies ◽  
Adaptation Limits

Design strategies for sustainable buildings, that improve building performance and avoid extensive resource utilization, should also promote healthy indoor environments. The following paper contains a review of the couplings between (1) building design, (2) indoor environmental quality and (3) occupant behavior. The paper focuses on defining the limits of adaptation on the three aforementioned levels to ensure the energy efficiency of the whole system and healthy environments. The adaptation limits are described for measurable physical parameters and the relevant responsible human sensory systems, evaluating thermal comfort, visual comfort, indoor air quality and acoustical quality. The goal is to describe the interactions between the three levels where none is a passive participant, but rather an active agent of a wider human-built environment system. The conclusions are drawn in regard to the comfort of the occupant. The study reviews more than 300 sources, ranging from journals, books, conference proceedings, and reports complemented by a review of standards and directives.

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