Achieving 'excellent' indoor air quality in commercial offices equipped with air-handling unit - respirable suspended particulate

Lam, K.S.; Chan, Fan; Fung, Wing K.; Lui, B. S. S.; Lau, L. W. L.

doi:10.1111/j.1600-0668.2005.00409.x

Cited by 6 publications

(2 citation statements)

References 11 publications

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“…There are many existing experimental and modeling studies on how to control particle levels by use of filters in a room (Antonicelli et al 1991;AEA Technology 1994;Cheng et al 1998;Johnson and Brown 1998;Emmerich and Nabinger 2001;Cheong et al 2004;Lam et al 2006). However, these studies mostly focused on the effectiveness of portable air cleaners for the removal of particles from residential or commercial buildings, especially on removal of large particles related to pet allergens, pollen, and dustmites (Ward et al 2005).…”

Section: Introductionmentioning

confidence: 98%

Particle removal efficiency of the portable HEPA air cleaner in a simulated hospital ward

Qian

Sun

et al. 2010

Build. Simul.

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Use of a HEPA (high efficiency particulate air) filter in a room is believed to assist in reducing the risk of transmission of infectious diseases through removing the particles or large droplets to which pathogens may be attached. Use of a portable HEPA filter(s) in hospital wards is hypothesized to increase the effective ventilation rate (for particles only). Use of a portable HEPA filter is also hypothesized to increase the effective airflow rate of the general ward to the standard of an isolation ward for emerging infection diseases. This may be a good solution for housing patients when the number of beds in an isolation ward is insufficient. An experiment was conducted in a full scale experimental ward with a dimension of 6.7 m × 6 m × 2.7 m and 6 beds to test these hypotheses for a portable HEPA filter. The removal efficiency for different size particles was measured at different locations. The influence of the portable HEPA air cleaner on the airflow pattern was also studied through smoke visualization and computational fluid dynamics (CFD) simulations. Results show that the HEPA filter can effectively decrease the particle concentration level. The effective air change rate achieved by the HEPA filter (for particle removal only) is from 2.7 to 5.6 ACH in the ward. The strong supply air jet from the portable HEPA filter interacted with the room airflow pattern and became dominate, introducing global airflow mixing in the room.Background noise levels were also measured and noise level in the room increased when the maximum airflow of the filter was used.

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Section: Introductionmentioning

confidence: 98%

Particle removal efficiency of the portable HEPA air cleaner in a simulated hospital ward

Qian

Sun

et al. 2010

Build. Simul.

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“…Wong and Mui [12] examined the ventilation demands of an HVAC system due to occupant-load variations. Several authors also discussed the effect of ventilation and air filters on the decay rates of indoor particles [13,14] and the relationship between indoor and outdoor contaminant concentrations [15,16]. More recently, to resolve this dilemma, some researchers proposed some control strategies of outdoor air rates [17], intelligent fuzzy controller [18,19], and combined variable refrigerant volume and variable air volume (VAV) AC systems [20].…”

Section: Introductionmentioning

confidence: 99%

A Dynamic Simulation of Indoor Polydispersion of Particles in All-Air Air-Conditioned Environment with Dynamical Particle Sources

Sun

et al. 2011

Indoor and Built Environment

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This paper reports an investigation of the impact of indoor dynamic particle source on the operating strategies of all-air air-conditioning systems using a state-space model. In the case of constant air volume system, the simulation results indicated that if the designed air supply rate was properly determined, the indoor particle concentrations would satisfy the specified requirements of indoor air quality standards. For a variable air volume system, if the strength of indoor particle source is, in a relative sense, large compared to the cooling load, the particle concentrations could markedly increase and would probably bring about indoor air quality problem. The partial load ratio, a dimensionless ratio of the partial source ratio to the partial cooling/heating load ratio, has been suggested as an indicator to guide the design and operation of the air supply rate of variable air volume system. This operating strategy builds on the basis of the identification of indoor sources and takes the relative importance of cooling load and particle sources into the evaluation. The computational results showed that the ventilation performance of variable air volume system was improved by applying the partial load ratio to the operation of variable air volume system.

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Indoor Air Quality in Nonindustrial Occupational Environments

Morey

Crawford

Rottersman³

2011

Patty's Industrial Hygiene

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The study summarizes about the indoor air quality of the buildings. Historically, the concept of indoor air quality (IAQ) has included view points that outdoor ventilation air is required both to prevent adverse health effects and to provide for comfort of occupants. It has been observed that airborne contagious diseases and malodor are more prominent in the crowded places with deﬁcient ventilation. The different approaches that can be used during IAQ evaluations reﬂect the varied kinds of problems that can occur in buildings. Higher morbidity and mortality in developing countries have multifactorial causes, with contaminated food, water, and air as major risk factors. An ASHRAE ventilation standard recommends the provision of outdoor air rate per person to lower the risk of diseases. The article focuses IAQ evaluation protocols and guidelines, Canadian and EPA guides, etc.

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Achieving 'excellent' indoor air quality in commercial offices equipped with air-handling unit - respirable suspended particulate

Cited by 6 publications

References 11 publications

Particle removal efficiency of the portable HEPA air cleaner in a simulated hospital ward

Particle removal efficiency of the portable HEPA air cleaner in a simulated hospital ward

A Dynamic Simulation of Indoor Polydispersion of Particles in All-Air Air-Conditioned Environment with Dynamical Particle Sources

Indoor Air Quality in Nonindustrial Occupational Environments

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