Effects of combined central air conditioning diffusers and window-integrated ventilation system on indoor air quality and thermal comfort in an office

Park, Dong Yoon; Chang, Sun Hyok

doi:10.1016/j.scs.2020.102292

Cited by 42 publications

(23 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Moreover, when air-conditioning systems were in use, doors and windows were often closed to maintain a suitable temperature, which resulted in reduced ventilation rates [ 42 ]. Likewise, poor design and operation of air-conditioning systems can contribute to inadequate ventilation [ 44 , 45 ] and these factors may account for the increase in infection risks when exposed to air-conditioning systems in hospitals. Compared to window or split types of air-conditioning systems, often used in single-patient rooms, recycled central air-conditioning systems were more often installed in multiple-patients' room in a study conducted in a certain hospital in India [ 40 ].…”

Section: Discussionmentioning

confidence: 99%

Effects of air-conditioning systems in the public areas of hospitals: A scoping review

Dai

et al. 2021

Epidemiol. Infect.

View full text Add to dashboard Cite

Almost all hospitals are equipped with air-conditioning systems to provide a comfortable environment for patients and staff. However, the accumulation of dust and moisture within these systems increases the risk of transmission of microbes and have on occasion been associated with outbreaks of infection. Nevertheless, the impact of air-conditioning on the transmission of microorganisms leading to infection remains largely uncertain. We conducted a scoping review to screen systematically the evidence for such an association in the face of the coronavirus disease 2019 epidemic. PubMed, Embase and Web of Science databases were explored for relevant studies addressing microbial contamination of the air, their transmission and association with infectious diseases. The review process yielded 21 publications, 17 of which were cross-sectional studies, three were cohort studies and one case−control study. Our analysis showed that, compared with naturally ventilated areas, microbial loads were significantly lower in air-conditioned areas, but the incidence of infections increased if not properly managed. The use of high-efficiency particulate air (HEPA) filtration not only decreased transmission of airborne bioaerosols and various microorganisms, but also reduced the risk of infections. By contrast, contaminated air-conditioning systems in hospital rooms were associated with a higher risk of patient infection. Cleaning and maintenance of such systems to recommended standards should be performed regularly and where appropriate, the installation of HEPA filters can effectively mitigate microbial contamination in the public areas of hospitals.

show abstract

Section: Discussionmentioning

confidence: 99%

Effects of air-conditioning systems in the public areas of hospitals: A scoping review

Dai

et al. 2021

Epidemiol. Infect.

View full text Add to dashboard Cite

show abstract

“…Menurut Rooley (1997) serta Park dan Chang (2020), terdapat dua permasalahan yang sering dikaitkan dengan kualiti udara dalaman iaitu ketidakselesaan dan penyakit. Kualiti udara yang tidak baik adalah berkait rapat dengan operasi dan penyelenggaraan sistem penyaman udara yang kurang sempurna (Mandin et al 2016;NIOSH, 2003;Park & Chang, 2020). Kegagalan sistem penyaman udara akan memberi kesan yang negative kepada kesihatan dan juga keselesaan pekerja di sesebuah tempat kerja (Chandrashekaran & Gopalakrishnan, 2008;Park & Chang, 2020).…”

Section: Kajian Literaturunclassified

“…Kualiti udara yang tidak baik adalah berkait rapat dengan operasi dan penyelenggaraan sistem penyaman udara yang kurang sempurna (Mandin et al 2016;NIOSH, 2003;Park & Chang, 2020). Kegagalan sistem penyaman udara akan memberi kesan yang negative kepada kesihatan dan juga keselesaan pekerja di sesebuah tempat kerja (Chandrashekaran & Gopalakrishnan, 2008;Park & Chang, 2020). Ini adalah kerana sistem penyaman udara yang gagal mempunyai sumber pencemaran bio aerosol seperti acuan, bakteria, alga, spora dan sel protozoa dan bahan cemar lain (Batterman & Burge, 1995;Godwin, 2003;Park & Chang, 2020;Singh, 1996).…”

Section: Kajian Literaturunclassified

“…Antara penyakit yang berpunca daripada persekitaran tempat kerja adalah serangan wabak penyakit berjangkit seperti severe acute respiratory syndrome (SARS), virus influenza A (H1N1), selsema burung, denggi, chikungunya, malaria, penyakit berkaitan bangunan (building-related illness) atau sindrom bangunan sakit (sick building syndrome) dan sebagainya. Pada masa ini, pekerja telah menjadi semakin kurang bertoleransi terhadap aspek tempat kerja yang tidak bersesuaian dengan mereka (Park & Chang, 2020). Sementara itu, Kloth (1996) dan Etemadinezhad et al (2017) menambah, kepuasan pekerja terhadap persekitaran akan mempengaruhi prestasi tugas masing-masing dan proses kerja pada keseluruhannya.…”

unclassified

See 1 more Smart Citation

Penilaian elemen kualiti udara dalaman dan kaitannya terhadap simptom kesihatan pekerja di pejabat kerajaan sekitar Wilayah Persekutuan Putrajaya

2021

View full text Add to dashboard Cite

Penurunan kualiti udaran dalaman (IAQ) mempunyai kesan langsung kepada permasalahan kesihatan pekerja di sesebuah bangunan. Suhu, kelembapan relatif, kadar aliran pengudaraan dan bauan merupakan aspek yang digunakan untuk menentukan impak IAQ yang dihadapi oleh pekerja pejabat. Kajian ini dijalankan bagi menilai elemen-elemen IAQ dan menganalisis simptom kesihatan pekerjaan yang berkaitan dengan IAQ. Kajian telah dilakukan melalui maklum balas yang diperoleh daripada 562 pekerja di sembilan buah pejabat kerajaan sekitar Pusat Pentadbiran Kerajaan Persekutuan Malaysia, Putrajaya melalui borang soal selidik yang disediakan dan data kajian telah dianalisis menggunakan kaedah analisis deskriptif. Keputusan awal analisis deskriptif menunjukkan bahawa 52.3 peratus atau lebih separuh pekerja pejabat pernah menghadapi kesan terhadap ketidaksempurnaan IAQ. Seterusnya, keputusan analisis lanjut mengambarkan bahawa 41.8 peratus pekerja pejabat pernah menghadapi pelbagai simptom penyakit semasa berada di pejabat. Antara simptom penyakit yang signifikan dialami oleh pekerja pejabat ialah bersin, sakit kepala dan tekanan di tempat kerja. Manakala, 44.5 peratus atau lebih pekerja yang mengalami simptom penyakit semasa berada di pejabat telah pulih apabila meninggalkan pejabat. Keadaan ini menunjukkan terdapatnya ketidaksempurnaan IAQ yang sekaligus menimbulkan kesan simptom kesihatan kepada pekerja pejabat. Keadaan sebegini boleh dianggap bahawa pejabat di kawasan kajian ini mengalami sindrom penyakit bangunan atau penyakit berkaitan bangunan. Justeru itu langkah penambahbaikan terhadap elemen IAQ perlu diambil bagi mengatasi masalah ini.

show abstract

“…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]. For this purpose, natural ventilation with portable air cleaners and mechanical ventilation systems with particle filters are strategies indicated for removing indoor air pollutants [7,11].…”

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

Effects of combined central air conditioning diffusers and window-integrated ventilation system on indoor air quality and thermal comfort in an office

Cited by 42 publications

References 22 publications

Effects of air-conditioning systems in the public areas of hospitals: A scoping review

Effects of air-conditioning systems in the public areas of hospitals: A scoping review

Penilaian elemen kualiti udara dalaman dan kaitannya terhadap simptom kesihatan pekerja di pejabat kerajaan sekitar Wilayah Persekutuan Putrajaya

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

Contact Info

Product

Resources

About