Ventilation to Eliminate Oxygen Deficiency in a Confined Space—Part II: Noncubical Models

Garrison, Richard P.; Erig, Muzaffer

doi:10.1080/08828032.1989.10388588

Cited by 3 publications

(1 citation statement)

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“…Garrison and coworkers [15][16][17][18] examined the mechanical ventilation using a fan in a small model of confined spaces containing various gas mixtures. These studies highlighted the problem of using substances that are normally foreign to these environments and the difficulty in producing the dilute, rapidly, well-mixed atmosphere, required to satisfy the mathematics for uniform dilution during ventilation processes.…”

Section: Introductionmentioning

confidence: 99%

Ventilation Induced in an Isolated Subsurface Structure by Natural Forces: Method Development and Application

McManus

Haddad

2019

Infrastructures

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It is believed that isolated subsurface structures of an infrastructure do not ventilate through opening(s) in manhole covers. The literature has almost no information on this topic. This study reports on considerations involved in the development and utilization of a method to study this question. Carbon monoxide (CO) is readily obtainable in engine exhaust, easily detectable at very low concentration, and is relatively safe to handle, which makes it ideal for use as a tracer gas. Transfer into the airspace of the structure was carried out using metal tubing. This study examined the engine operating time and the number of openings in a manhole cover. CO was measured using four instruments in the vertical profile. It was found to generally decrease in a narrow band, initially linearly through a curvilinear region and a linear tail. Clearance of most of the contaminant occurred rapidly during the first part of the process. A decrease to 25 ppm required from 439 min (7 openings) to 1118 min (1 opening). Ambient temperature and near-surface air flow likely influenced these values. The measurement profiles strongly suggest that the atmosphere in the airspace was rapidly and thoroughly well-mixed. The methodology developed and reported here is suitable for a more expanded investigation, the intent being to identify modifications of the design to optimize the process.

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Section: Introductionmentioning

confidence: 99%