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As occupants spend almost 90% of their day indoors, especially in the workplaces, Indoor Environmental Quality (IEQ) plays a primary role in health and wellbeing, productivity, and building energy consumption. Adopting the IEQ and Post-Occupancy Evaluation (POE), data has been gathered from nine multilevel open offices within a university building located in Al Ain, in the United Arab Emirates (UAE) for three winter months. Physical parameters were monitored using data loggers to record the main IEQ factors.
Title of the Study | Region Studied | Study Focus | Key Findings | Year |
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Occupant productivity and office indoor environment quality. | - | Literature study. | The literature review shows both the economic and health related benefits of good IEQ. It illustrates the significance of the impact of the IEQ on occupant comfort and productivity. | 2016 [28] |
Satisfaction of occupants toward indoor environment quality of certified green office buildings in Taiwan | Taiwan | A post-occupancy evaluation was employed in the study consisting of a field survey of subjective perception among indoor occupants and on-site environmental measurements. | The overall IEQ satisfaction was statistically significantly greater in the certified green building than the conventional buildings. However, a re-visit of thermal comfort-related criteria may be required. | 2014 [22] |
Spatial mapping of occupant satisfaction and indoor environment quality in a LEED platinum campus building. | USA | POE approach with GIS-based spatial mapping method was used to analyse and visualize the survey results of building occupant satisfaction and the measured indoor environment quality. | Occupants complained regarding thermal comfort, reporting it was too cold. CO2 level was also predominantly higher. Light levels in the building were found to be higher than preferred as artificial lighting was excessively used even when daylight was available. | 2014 [23] |
Patients and the sick building syndrome. | USA | Suggest physician approaches to identify disease in individual and group effects on patients and analyse the impact of indoor environmental exposure. | Sick building syndrome can show several recognizable symptoms that include eye irritation, nose irritation, throat irritation, headache, fatigue, asthma-like symptoms, and more. | 1994 [9] |
Indoor Air Quality in the 21st Century: Search for Excellence. | - | Studies key principles for a new philosophy of excellence. | Improved indoor air quality increases productivity and decreases sick building syndrome symptoms. Individual control of the thermal environment should be provided to increase user comfort. | 2000 [12] |
Comparative study on the indoor environment quality of green office buildings in China with a long-term field measurement and investigation. | China | This study analyses the subjective questionnaires and objective measurements of the indoor environment quality (IEQ) in green building. | Results show that the green buildings in China possess significantly higher IEQ satisfaction levels than conventional buildings. This emphasises the importance of operation management and individual control methods in the building. | 2015 [15] |
Thermal comfort and behavioural strategies in office buildings located in a hot-arid climate. | Australia | The effects of indoor climate on thermal comfort levels and adaptive behaviour of office workers. | Shows office workers prefer adjusting the set temperature of the building to 22.21 °C for both seasons. As opposed to the ASHRAE scale, it occurred at 20.31 °C in winter. Further research can reduce overcooling cost with a positive effect on thermal comfort and workplace productivity. | 2001 [18] |
Perception of indoor environment quality in differently ventilated workplaces in tropical monsoon climates. | Sri Lanka | The research investigates the perception of indoor environment quality (IEQ) in differently ventilated workspaces. | Air conditioning (AC) and ductless mini split system air conditioning (MM) buildings were rated more satisfactory than naturally ventilated (NV) systems for overall comfort of indoor environment conditions. | 2015 [19] |
Indoor air quality, ventilation, and health symptoms in schools: An analysis of existing information | USA | investigates causal relationships between health symptoms and exposures to specific pollutants in schools | Reported ventilation and CO2 data strongly indicate that ventilation is inadequate in many classrooms, possibly leading to health symptoms. | 2003 [20] |
Indoor environmental quality, occupant satisfaction, and acute building-related health symptoms in Green Mark-certified compared with non-certified office buildings | Singapore | This study compared IEQ performance in green and non-green office buildings. Adopting a cross-sectional study design between objective measurements and subjective measurements. | This study offered a positive association of green buildings with qualitatively and quantitatively measured performance of IEQ. | 2018 [21] |
Listening to the occupants: a Web-based indoor environmental quality survey | - | Developing a benchmarking survey that can be used as a diagnostic tool to identify specific problems and their sources | The research discusses survey guidelines to create a feedback loop for building industry professionals, so that they can learn how various building design features and technologies affect occupant comfort, satisfaction and productivity. | 2004 [25] |
Measured energy use and indoor environment quality in green office buildings in China. | China | Energy consumption and indoor environment quality (IEQ) are compared in green office buildings with common ones through energy data collection, physical parameters measurement and satisfaction survey. | User satisfaction in green buildings is statistically significantly higher than those in common buildings. Especially in the field of thermal environment, IAQ, facilities and operating & maintenance. | 2014 [29] |
IEQ Factors | Parameters | Control Method | Issues | Parameter Measures | Threshold | Health Symptoms |
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Thermal Comfort | Temperature Relative humidity Air velocity User activity | Air conditioning system Building design | Adaptation Building integration Energy use | Temperature | 24–26 °C ** | Respiratory problems |
Relative Humidity | 30–60% ** | Microbial growth, skin drying, irritation of mucus membranes, and dry eyes | ||||
Indoor Air Quality | Pollution sources Ventilation rate and efficiency |
Source control Ventilation system maintenance | Pollution Fine dust | PM2.5 | 15 µg/m3 * | Respiratory and cardiovascular diseases including asthma, myocardial ischemia, high blood pressure and heart disease |
PM10 | 50 µg/m * | |||||
CO2 | 800 ppm * | Increased risk of sick building syndrome and symptoms such as headache | ||||
TVOCs | 312 ppb * | Dry throat, runny nose, asthma attacks, poisoning, and cancer | ||||
Lighting Quality | Luminance Reflectance Colour, temperature View, and daylight | Luminance distribution Artificial lighting and daylighting integration | Daylight relation to thermal comfort Energy use | Lux level | 300–500 lux * | Headaches, circadian phase disruptions, breast cancer, sleep disorder, and depression |
Acoustical Quality | Sound level Absorption Sound insulation Reverberation time | Acoustical control Passive noise control Active noise control |
Vibrations and annoyance long term health effects | Sound level | 55 dBA * | Hypertension, stress, poor concentration, memory retention and mental arithmetic |