Dynamic transport of livestock generated VOC-odor in a ventilated airspace with mixing heterogeneity
Resource
Atmospheric Environment 38 (3): 345-355
Journal
Atmospheric Environment
Journal Volume
38
Journal Issue
3
Pages
345-355
Date Issued
2004
Date
2004
Author(s)
Liang, Huang-Min
Abstract
This research proposes a multiple airflow regions gamma model to simulate airflow pattern in a ventilated airspace with mixing heterogeneity based on residence time distribution and gamma distribution statistics. We select p-cresol, toluene and p-xylene, three intensive odor causing volatile organic compounds (VOC-odor) found in swine housing, to account different mixing behaviors. By fitting the VOC-odor concentration profile calculated from VOC-odor transport model with three-parameter gamma distribution, we can characterize the extent of mixing and predict mixing heterogeneity in a ventilated livestock housing. A typical swine housing with a mechanical ventilation system in southern Taiwan was selected for model simulation. Results demonstrate that the mean residence time of p-cresol, toluene and p-xylene are 44.45±0.91, 267.30±58.90 and 332.38±129.83h, whereas mean mixing factor are 0.20±0.05, 0.81±0.17, and 0.81±0.19, respectively, corresponding to a ventilation rate of 0.075±0.025m3s-1pig-1 within manure moisture content of 70±10%. This research gives additional physical information to characterize mixing behavior temporally and spatially with mean residence time and mixing factor, respectively, in a ventilated airspace with mixing heterogeneity. The robustness of multiple airflow regions gamma model can offer designers to reconsider the efficiency of ventilation systems through different mixing flow patterns in place of complete mixing hypothesis. © 2003 Elsevier Ltd. All rights reserved.
SDGs
Type
journal article
File(s)![Thumbnail Image]()
Loading...
Name
40.pdf
Size
333.4 KB
Format
Adobe PDF
Checksum
(MD5):190ca39f0b1cc1a6636edc624970cb68