Experimental assessment of thermal comfort and indoor air quality in worship places: The influence of occupancy level and period

Reda, Ibrahim; AbdelMessih, Raouf N.; Steit, Mohamed; Mina, Ehab M.

doi:10.1016/j.ijthermalsci.2022.107686

Cited by 14 publications

(5 citation statements)

References 34 publications

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“…-Relative humidity sensors are not available in the apartments. A thorough and complete assessment of the indoor thermal comfort following International Standards such as the ASHRAE 55 and ISO 7730 [24,25] was therefore not possible. However, Sections 3.6 and 3.7 propose insights based on the available measurements, including indoor temperature and CO 2 concentration.…”

Section: Study Roadmap and Limitationsmentioning

confidence: 99%

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Long-Term Evaluation of Comfort, Indoor Air Quality and Energy Performance in Buildings: The Case of the KTH Live-In Lab Testbeds

2022

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Digitalization offers new, unprecedented possibilities to increase the energy efficiency and improve the indoor conditions in buildings in a cost-efficient way. Smart buildings are seen by many stakeholders as the way forward. Smart buildings feature advanced monitoring and control systems that allow a better control of the buildings’ indoor spaces, but it is becoming evident that the massive amount of data produced in smart buildings is rarely used. This work presents a long-term evaluation of a smart building testbed for one year; the building features state-of-the-art monitoring capability and local energy generation (PV). The analysis shows room for improving energy efficiency and indoor comfort due to non-optimal control settings; for instance, average indoor temperatures in all winter months were above 24 °C. The analysis of electricity and domestic hot water use has shown a relevant spread in average use, with single users consuming approximately four times more than the average users. The combination of CO2 and temperature sensor was sufficient to pinpoint the anomalous operation of windows in wintertime, which has an impact on energy use for space heating. Although the quantification of the impact of users on the overall energy performance of the building was beyond the scope of this paper, this study showcases that modern commercial monitoring systems for buildings have the potential to identify anomalies. The evidence collected in the paper suggests that this data could be used to promote energy-efficient behaviors among building occupants and shows that cost-effective actions could be carried out if data generated by the monitoring and control systems were used more extensively.

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Section: Study Roadmap and Limitationsmentioning

confidence: 99%

“…-Relative humidity is not available. This precludes the possibility for a complete assessment of the indoor thermal comfort following International Standards such as the ASHRAE 55 and ISO 7730 [24,25]. -Windows magnetic sensors are not available.…”

Section: Shortcomings Of the Monitoring Systemmentioning

confidence: 99%

Long-Term Evaluation of Comfort, Indoor Air Quality and Energy Performance in Buildings: The Case of the KTH Live-In Lab Testbeds

2022

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“…Carbon dioxide (CO2) levels indoors are often used as an indicator of indoor air quality and ventilation effectiveness. Studies have consistently shown that indoor CO2 levels increase with occupancy, particularly in inadequately ventilated spaces [3,4]. High indoor CO2 levels have been associated with adverse health effects, including headaches, fatigue, and decreased cognitive function [5] as well as decreased work performance and productivity [6,7].…”

Section: Introductionmentioning

confidence: 99%

Investigation of personal air pollution exposures and occupants’ fresh air demands in two office buildings in Switzerland

Yun,

Licina

2023

J. Phys.: Conf. Ser.

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This study assessed personal exposures to indoor air pollutants in office environments with dynamic occupancy profiles. A two-week field campaign was conducted in two Swiss office buildings, examining three target areas in each building. We measured air temperature (T), relative humidity (RH), CO2, PM2.5, and PM10 levels at three stationary locations of each target area. Four office workers carried a customized vest to monitor personal CO2 and PM levels near their breathing zone. Using smartwatches, the workers completed hourly surveys about their activity profiles and preferences for outdoor air. We found that CO2 and PM10 concentrations were 1.2–1.3x and 1.8–2.5x higher, respectively, in the personal monitor compared to stationary sensors. Occupants had higher personal CO2 levels during sitting activity and higher personal PM levels during standing activity. Lunch/coffee/call activities were associated with discernible peaks of personal exposure to CO2, PM2.5, and PM10. The higher T coupled with lower RH measured at the personal level was associated with higher occupant demands for outdoor air.

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“…In contrast to residential and office structures, individuals are more likely to exit unfavorable indoor environments in retail establishments [6]. Because humans spend so much time inside, indoor air quality (IAQ) significantly impacts human health and has received a great deal of attention in recent decades [7][8][9][10][11][12][13]. Indoor environments expose individuals to a range of air pollutants, including various size fractions of particulate matter (PM1, PM2.5, PM10) and gaseous pollutants such as carbon monoxide (CO), carbon dioxide (CO 2 ), nitrogen dioxide (NO 2 ), ozone (O 3 ), sulfur dioxide (SO 2 ), and volatile organic compounds (VOCs).…”

Section: Introductionmentioning

confidence: 99%

Variability of Air Pollutants in the Indoor Air of a General Store

Tepeneu,

Lupitu,

Surdea-Blaga

et al. 2023

Applied Sciences

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This research investigates different facets of indoor air quality and the corresponding health symptoms within a retail environment. Formaldehyde, classified as a Group B carcinogenic substance, was found within safe limits indoors, primarily originating from surface coatings, flooring products, textiles, and furniture. Monoterpenes, lactic acid, and particulate matter levels were also assessed, with varying indoor–outdoor ratios. Notably, we identified a relatively low concentration of PM2.5, possibly influenced by enhanced cleaning practices during the COVID-19 pandemic. Symptom assessment revealed that many young workers experienced work-related symptoms, notably fatigue, nose-, throat-, and skin-related issues, aligning with previous findings. Although we could not conclusively link these symptoms to sick building syndrome (SBS) or formaldehyde exposure, it underscores the importance of further investigation. Notably, we observed no gender-based differences in symptom prevalence, but this study’s limited size requires caution in generalization. This study contributes to understanding indoor air quality and associated symptoms in an economically significant sector, emphasizing the need for continued research, especially considering the potential impact on workforce health in the broader context.

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Experimental assessment of thermal comfort and indoor air quality in worship places: The influence of occupancy level and period

Cited by 14 publications

References 34 publications

Long-Term Evaluation of Comfort, Indoor Air Quality and Energy Performance in Buildings: The Case of the KTH Live-In Lab Testbeds

Long-Term Evaluation of Comfort, Indoor Air Quality and Energy Performance in Buildings: The Case of the KTH Live-In Lab Testbeds

Investigation of personal air pollution exposures and occupants’ fresh air demands in two office buildings in Switzerland

Variability of Air Pollutants in the Indoor Air of a General Store

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