Air-conditioned university laboratories: Comparing CO 2 measurement for centralized and split-unit systems

Hussin, M. Hazwan; Ismail, Mohd Rodzi; Ahmad, Mohd Azmier

doi:10.1016/j.jksues.2014.08.005

Cited by 17 publications

(12 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The accuracy of the data logger is ±0.3°C for the temperature range from 0°C to +50°C, <2.5% RH for the range from 10 to 90% and ±30 ppm ±5% of the measured carbon dioxide value. The measuring and recording device was placed, following [17,18] at 1.2 m above the floor level, in the middle of the auditorium. Thus the data was collected from the central location of the room, with a special attention of being away from direct influence of room occupants.…”

Section: Methodsmentioning

confidence: 99%

Research of CO₂concentration in naturally ventilated lecture room

Laska

Dudkiewicz

2017

E3S Web Conf.

View full text Add to dashboard Cite

Abstract. Naturally ventilated buildings especially dedicated for educational purposes need to be design to achieve required level of thermal comfort and indoor air quality. It is crucial in terms of both: health and productivity of the room users. Higher requirements of indoor environment are important due to the level of students concentration, their ability to acquire new knowledge and willingness to interact with the lecturer. The article presents the results of experimental study and surveys undertaken in naturally ventilated lecture room. The data is analysed in terms of CO2 concentration and its possible influence on users. Furthermore the outcome of the research is compared with the CO2 concentration models available in the literature.

show abstract

Section: Methodsmentioning

confidence: 99%

Research of CO₂concentration in naturally ventilated lecture room

Laska

Dudkiewicz

2017

E3S Web Conf.

View full text Add to dashboard Cite

show abstract

“…The high CO 2 concentrations recorded in the office space show that the office space was inadequately ventilated in the restricted air circulation of the ACSU office building as the air movements recorded was low and could perhapse provide the conditions for bacterial growth. The CO 2 concentration in indoor air indicates ventilation rate, comfort status, indoor air quality, high occupancy rate and pollution levels (Godwin & Batterman, 2007;Mahayuddin & Awbi, 2012;Batog & Badura, 2013;McGill et al, 2015;Fan et al, 2017;Hussin, 2017;Al-Awadi, 2018). Thus, the high CO 2 concentrations level in the office space reflected the lack of ventilation, poor air quality, and the indoor air is not refreshed enough within the office building.…”

Section: Indoor Air Contaminantsmentioning

confidence: 99%

“…Growing scientific evidence during the last few decades has indicated that the concentrations of certain pollutants in indoor air maybe 2 to5 times, and occasionally more than 100 times higher, than those in outdoor air (USEPA, 2017;Zock et al, 2002). Therefore, the indoor air quality in the office building needs to be monitored as it is an essential factor in maintaining employee productivity and health (Kubba, 2009;Hussin 2017). Vasile et al (2016) suggested increasing the airtightness of the building envelope by analysing and making use of the natural ventilation system.…”

Section: Indoor Air Contaminantsmentioning

confidence: 99%

Assessment of Indoor Air Quality in an Air-Conditioning Split Units (Acsu) Office Building

Rasli¹,

Ramli²,

Ahmad³

et al. 2021

JSSM

View full text Add to dashboard Cite

The indoor air quality (IAQ) in Air-Conditioning Split Units (ACSU) offices depends mainly on recirculated indoor air that has gone through filters. Workers usually spend eight hours in the office space with restricted air circulation. An IAQ assessment was conducted at the administrative office space, USM, to investigate conditions in an ACSU office space; from 8.00 a.m. to 6.00 p.m. It starts with a walkthrough survey followed by the filling of questionnaires, with a sample size of 11 workers for insights into the office operations. The specific physical parameters (T, RH, and AM) and indoor air contaminants (CO, CH 2 O, O 3 , PM 10 , TVOC, TBC, TFC, and CO 2 ) were conducted at three points indoor and one point outdoor. The T and RH were within the acceptable range of 23-26°C and 40-70%, respectively by ICOP, while the AM was very low and less than the acceptable threshold range of 0.

show abstract

“…Air quality is associated with physical, chemical and biological characteristics of indoor air, including the concentration of pollutants like carbon dioxide (CO2). It is known that high CO2 concentration in indoor environments is an outcome of human metabolism and lack of indoor air exchange -mainly due to the air recirculation by air-conditioners [7,9]. One of the main strategies that contribute to the reduction of pollutants concentration and improvement of air quality is suitable air circulation in order to allow air exchange between indoor and outdoor environments [10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Assessment of Air Quality Perception and Its Effects on Users’ Thermal Comfort in Office Buildings

CCd¹,

Rf²,

Ghisi³

2021

Preprint

View full text Add to dashboard Cite

Since people spend most of their time in indoor environments, the objective of this work was to study indoor air quality perception and its effects on users’ thermal comfort. Based on previous data from a building with a central air-conditioning system and two mixed-mode buildings located in the humid subtropical climate of Florianópolis, southern Brazil, statistical analyses were performed. Each user subjective answer obtained through a questionnaire was combined with the corresponding environmental conditions – measured using microclimate stations, a portable thermo-anemometer and a CO2 analyser. Results showed that improvement in air quality was associated with the reduction of air temperature and humidity ratio. Also, there was a significant influence of thermal, air movement and humidity sensation and acceptability of air quality perception. Users felt more satisfied or neutral with air quality for being in thermal comfort, and not because of the CO2 level – which means that air quality perception is influenced by factors other than CO2. This study recommends the implementation of an air exchange device in split air-conditioners with air recirculation used in mixed-mode buildings in Brazil. It is important to provide suitable indoor ventilation to reduce pollutants concentration, ensure good air quality and prevent respiratory diseases.

show abstract

Air-conditioned university laboratories: Comparing CO 2 measurement for centralized and split-unit systems

Cited by 17 publications

References 24 publications

Research of CO₂concentration in naturally ventilated lecture room

Research of CO₂concentration in naturally ventilated lecture room

Assessment of Indoor Air Quality in an Air-Conditioning Split Units (Acsu) Office Building

Assessment of Air Quality Perception and Its Effects on Users’ Thermal Comfort in Office Buildings

Contact Info

Product

Resources

About

Air-conditioned university laboratories: Comparing CO 2 measurement for centralized and split-unit systems

Cited by 17 publications

References 24 publications

Research of CO2concentration in naturally ventilated lecture room

Research of CO2concentration in naturally ventilated lecture room

Assessment of Indoor Air Quality in an Air-Conditioning Split Units (Acsu) Office Building

Assessment of Air Quality Perception and Its Effects on Users’ Thermal Comfort in Office Buildings

Contact Info

Product

Resources

About

Research of CO₂concentration in naturally ventilated lecture room

Research of CO₂concentration in naturally ventilated lecture room