2005
DOI: 10.1080/027868290908795
|View full text |Cite
|
Sign up to set email alerts
|

Particle Deposition in Ventilation Ducts: Connectors, Bends and Developing Turbulent Flow

Abstract: In ventilation ducts the turbulent flow profile is commonly disturbed or not fully developed and these conditions are likely to influence particle deposition to duct surfaces.Particle deposition rates at eight S-connectors, in two 90° duct bends and in two ducts where the turbulent flow profile was not fully developed were measured in a laboratory duct system with both bare steel and internally insulated ducts with hydraulic diameters of 15.2 cm. In the bare steel duct system, experiments with nominal particle… Show more

Help me understand this report

Search citation statements

Order By: Relevance

Paper Sections

Select...
4
1

Citation Types

3
30
0

Year Published

2006
2006
2020
2020

Publication Types

Select...
7
1

Relationship

0
8

Authors

Journals

citations
Cited by 40 publications
(33 citation statements)
references
References 10 publications
3
30
0
Order By: Relevance
“…Using the defined base cases, parametric influence was also determined with the use of a loading rate ratio (LRR), for the filter and coil loading rates only. The ducts were excluded from all succeeding discussion because they load so little relative to the other components (duct loading is distributed over the entire duct length and filter and coil loading are normalized by area normal to the volumetric flow) and duct deposition has been studied extensively elsewhere (Sippola and Nazaroff, 2003, 2004, 2005; Zhao and Wu, 2006a,b). The LRR is equal to the adjusted loading rate divided by the Rural or Urban base case loading rate, and the adjusted loading rate is the result of holding all parameters in the base case constant except for the varied parameter.…”
Section: Resultsmentioning
confidence: 99%
See 1 more Smart Citation
“…Using the defined base cases, parametric influence was also determined with the use of a loading rate ratio (LRR), for the filter and coil loading rates only. The ducts were excluded from all succeeding discussion because they load so little relative to the other components (duct loading is distributed over the entire duct length and filter and coil loading are normalized by area normal to the volumetric flow) and duct deposition has been studied extensively elsewhere (Sippola and Nazaroff, 2003, 2004, 2005; Zhao and Wu, 2006a,b). The LRR is equal to the adjusted loading rate divided by the Rural or Urban base case loading rate, and the adjusted loading rate is the result of holding all parameters in the base case constant except for the varied parameter.…”
Section: Resultsmentioning
confidence: 99%
“…Airborne particulate matter continually deposits on components of operating heating, ventilation, and air‐conditioning (HVAC) systems. Particle deposition is a strong function of particle size and researchers have characterized size‐resolved particle deposition to HVAC filters (Hanley et al., 1994; Hinds, 1999), heat exchangers (Siegel, 2002; Siegel and Nazaroff, 2003), and ducts (Sippola and Nazaroff, 2003, 2004, 2005; Zhao and Wu, 2006a,b). The particle mass loading rate to an HVAC system component is the product of the particle mass concentration immediately upstream of that component, the deposition fraction onto the component, and the volumetric flow rate through the HVAC system.…”
Section: Introductionmentioning
confidence: 99%
“…Since the particle deposition is influenced by numerous factors on straight duct surfaces (Lin et al 2003;Zhao and Wu 2007;Zhang and Chen 2009), the aerosol deposition in bends becomes more complex for different flow conditions and potential inertial impaction (Sippola and Nazaroff 2005). Up to date, limited experiments have been conducted to study aerosol deposition in a single bend.…”
Section: Introductionmentioning
confidence: 99%
“…Aerosol deposition in typical ventilation system of commercial or public buildings has been seldom examined. Sippola and Nazaroff (2005) investigated two types of bends in this kind of ventilation system during their experiments. The bend deposition was found to be greater than that in straight ducts with fully developed turbulent flow.…”
Section: Introductionmentioning
confidence: 99%
“…Once inside, airborne contaminants are easily distributed throughout the building by the heating, ventilation, and air conditioning (HVAC) system (Thatcher and Layton, 1995; Sippola and Nazaroff, 2005; Krauter and Biermann, 2007; Krauter et al, 2005; Kowalski et al, 2003). Recently, it was proposed that sampling HVAC filters from buildings within the suspected contamination zone can help responders determine the affected areas rapidly (Ackelsberg et al, 2011; Van Cuyk et al, 2012; Hong and Gurian, 2012; Stanley et al, 2008).…”
Section: Introductionmentioning
confidence: 99%