Skip directly to search Skip directly to A to Z list Skip directly to page options Skip directly to site content

NIOSHTIC-2 Publications Search

Search Results

Ventilation for Work in Confined Spaces.

Authors
Garrison-RP
Source
School of Public Health, The University of Michigan, Ann Arbor, Michigan 1991 Mar:72 pages
Link
NIOSHTIC No.
00200822
Abstract
A series of studies was conducted involving experimental testing and computer modeling to evaluate ventilation characteristics and improve design methods for confined spaces (CS). The models were developed in an effort to predict CS ventilation effectiveness and to advance ventilation design technology. Multicellular models of CS ventilation were programmed and tested for two basic variations. Model 1 used experimental data and approximations to represent airflow in the CS. Model 2 used airflow characteristics predicted by another computer model. Mechanical ventilation was far more effective than natural ventilation could have been in CS. In general supply ventilation was more effective than exhaust ventilation. The inlet/outlet elevation had a significant effect on effectiveness with low inlet/outlet elevations being generally more effective in diluting contaminants. Ventilation time decreased with increasing flow rate, but not usually in a linear manner. Significant, variable, and somewhat inconsistent effects on ventilation time were observed by changing the CS model shape. Ventilation effectiveness characteristics varied significantly with contaminant stratification caused by heavier than air contaminants. Dilution ventilation characteristics for simulated toxic concentrations were similar to those for oxygen deficiency caused by nitrogen (7727379).
Keywords
NIOSH-Grant; Control-technology; Tunneling; Ventilation-systems; Confined-spaces; Air-quality-control; Air-quality-monitoring; Sewer-cleaning; Miners;
Contact
Environmental & Indust Health University of Michigan 1420 Washington Heights Ann Arbor, MI 48109-2029
CAS No.
7727-37-9;
Publication Date
19910327
Document Type
Final Grant Report;
Funding Amount
285336.00
Funding Type
Grant;
Fiscal Year
1991
NTIS Accession No.
PB92-108455
NTIS Price
A05
Identifying No.
Grant-Number-R01-OH-02329
NIOSH Division
OEP
Priority Area
Control Technology and Personal Protective Equipment; Research Tools and Approaches; Control-technology;
Source Name
School of Public Health, The University of Michigan, Ann Arbor, Michigan
State
MI;
Performing Organization
University of Michigan at Ann Arbor, Ann Arbor, Michigan
TOP