Measuring dust deposition and generation rates is important for both its fundamental physics and the application of indoor air quality control. These measurements are very difficult to conduct directly in occupied livestock buildings. Two indirect methods were developed for the measurement of both deposition and generation rates under steady-state conditions and unsteady-state conditions respectively. A new mathematical model of particle size distribution was also developed for swine building dust. Based on the mass balance equation for a typical well mixed ventilation space, the nonlinear mathematical solutions were derived. For steady-state conditions, a transformation was employed to the nonlinear solution so the linear model was obtained. Then the sequential parameter estimation method was developed to estimate both dust deposition and generation rates. The input data were airborne dust concentrations versus filtration efficiency. This steady-state method actually converted the difficult measurements of dust deposition and generation rates into the simple measurements of dust concentrations versus filtration efficiency. For unsteady-state conditions, the nonlinear parameter estimation technique was employed to estimate the unknown parameters in the solution of the model. The input variable to this model was dust concentration versus time. The estimated unknowns were dust deposition and generation rates. This unsteady-state method actually converted the difficult measurements of dust deposition and generation rates into the simple measurements of dust concentration versus time. For the validation of the steady-state method, two sets (six sub-sets) of steady-state condition experiments were conducted in the laboratory and the data were compared to computer simulations. Three experiments were conducted to validate the unsteady-state method. The proposed methods were also tested using data from Gao and Feddes (1992) for steady-state conditions, and from Wadden and Scheff (1983) for unsteady-state conditions, respectively.
| Identifer | oai:union.ndltd.org:USASK/oai:usask.ca:etd-10212004-000124 |
| Date | 01 January 1996 |
| Creators | Chen, Yongcheng |
| Contributors | Zhang, Yuanhui, Barber, Ernest M. (Ernie) |
| Publisher | University of Saskatchewan |
| Source Sets | University of Saskatchewan Library |
| Language | English |
| Detected Language | English |
| Type | text |
| Format | application/pdf |
| Source | http://library.usask.ca/theses/available/etd-10212004-000124 |
| Rights | unrestricted, I hereby certify that, if appropriate, I have obtained and attached hereto a written permission statement from the owner(s) of each third party copyrighted matter to be included in my thesis, dissertation, or project report, allowing distribution as specified below. I certify that the version I submitted is the same as that approved by my advisory committee. I hereby grant to University of Saskatchewan or its agents the non-exclusive license to archive and make accessible, under the conditions specified below, my thesis, dissertation, or project report in whole or in part in all forms of media, now or hereafter known. I retain all other ownership rights to the copyright of the thesis, dissertation or project report. I also retain the right to use in future works (such as articles or books) all or part of this thesis, dissertation, or project report. |
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