Natural draft: its measurement and modeling in underground mine ventilation systems
This report is intended to provide an improved understanding of natural draft (natural ventilating pressure) and the effect of natural draft on underground mine ventilation circuits. Attention is focused on measurement of natural draft pressures during ventilation surveys in mechanically ventilated mines and on different methods for modeling natural draft using the measured data. Two different methods are described for mathematically estimating the magnitude of the natural draft pressure. Comparisons are made of results obtained using the different methods. Different procedures are described in regard to modeling natural draft usign the MSHA-modified Penn State computer program. One of the modeling procedures discussed is the existing computer routine for modeling natural draft. Use of the routine is described and illustrated relative to drafts that aid the mechanical ventilation system and relative to drafts that oppose the mechanical ventilation system.
- Research Organization:
- Mine Safety and Health Administration, Arlington, VA (USA)
- OSTI ID:
- 5696076
- Report Number(s):
- MSHA/IR-1183; ON: DE86901517
- Resource Relation:
- Other Information: Portions of this document are illegible in microfiche products
- Country of Publication:
- United States
- Language:
- English
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