Unsteady wind effects on natural ventilation
Ventilation stacks are becoming increasingly common in the design of naturally ventilated buildings. The overall aim of the work described is ultimately to improve design procedures for such buildings. This thesis presents the experimental and theoretical investigation of unsteady wind effects on n...
| Main Author: | |
|---|---|
| Format: | Thesis (University of Nottingham only) |
| Language: | English |
| Published: |
2010
|
| Subjects: | |
| Online Access: | https://eprints.nottingham.ac.uk/11653/ |
| _version_ | 1848791326518149120 |
|---|---|
| author | Wang, Bo |
| author_facet | Wang, Bo |
| author_sort | Wang, Bo |
| building | Nottingham Research Data Repository |
| collection | Online Access |
| description | Ventilation stacks are becoming increasingly common in the design of naturally ventilated buildings. The overall aim of the work described is ultimately to improve design procedures for such buildings.
This thesis presents the experimental and theoretical investigation of unsteady wind effects on natural ventilation of a single envelope with multiple openings for both wind alone, and wind and buoyancy combined cases. There are two types of openings: namely the sharp-edged orifice and the long opening (stacks being treated as long openings). Two methods are adopted: 1) direct wind tunnel measurements using the hot-wire technique; 2) theoretical analysis using steady and unsteady envelope flow models. For the wind alone experiments, the influences of wind speed, wind direction and opening configuration on flow patterns are studied. For the wind and buoyancy combined tests, the transitional process between wind dominated and buoyancy dominated states are investigated. The direct velocity measurements provide the criteria for testing the validity of the theoretical models, and ways to improve them. Additionally, improvements are made to the experimental techniques: e.g. a precise unsteady calibration method of the hot-wire is developed; improvements of pressure measurements are also investigated.
The experimental technique works well with multiple stacks. Even though small openings are used, some dependence of the mean pressure coefficient on opening configuration is observed. The theoretical models also work reasonably well with multiple stacks, yet it is observed that the accuracy of the theoretical models decrease with the increasing number of openings, and is sensitive to the chosen discharge coefficient which defines the characteristics of ventilation openings. |
| first_indexed | 2025-11-14T18:26:44Z |
| format | Thesis (University of Nottingham only) |
| id | nottingham-11653 |
| institution | University of Nottingham Malaysia Campus |
| institution_category | Local University |
| language | English |
| last_indexed | 2025-11-14T18:26:44Z |
| publishDate | 2010 |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | nottingham-116532025-02-28T11:14:48Z https://eprints.nottingham.ac.uk/11653/ Unsteady wind effects on natural ventilation Wang, Bo Ventilation stacks are becoming increasingly common in the design of naturally ventilated buildings. The overall aim of the work described is ultimately to improve design procedures for such buildings. This thesis presents the experimental and theoretical investigation of unsteady wind effects on natural ventilation of a single envelope with multiple openings for both wind alone, and wind and buoyancy combined cases. There are two types of openings: namely the sharp-edged orifice and the long opening (stacks being treated as long openings). Two methods are adopted: 1) direct wind tunnel measurements using the hot-wire technique; 2) theoretical analysis using steady and unsteady envelope flow models. For the wind alone experiments, the influences of wind speed, wind direction and opening configuration on flow patterns are studied. For the wind and buoyancy combined tests, the transitional process between wind dominated and buoyancy dominated states are investigated. The direct velocity measurements provide the criteria for testing the validity of the theoretical models, and ways to improve them. Additionally, improvements are made to the experimental techniques: e.g. a precise unsteady calibration method of the hot-wire is developed; improvements of pressure measurements are also investigated. The experimental technique works well with multiple stacks. Even though small openings are used, some dependence of the mean pressure coefficient on opening configuration is observed. The theoretical models also work reasonably well with multiple stacks, yet it is observed that the accuracy of the theoretical models decrease with the increasing number of openings, and is sensitive to the chosen discharge coefficient which defines the characteristics of ventilation openings. 2010-12-09 Thesis (University of Nottingham only) NonPeerReviewed application/pdf en arr https://eprints.nottingham.ac.uk/11653/1/Unsteady_wind_effects_on_natural_ventilation.pdf Wang, Bo (2010) Unsteady wind effects on natural ventilation. PhD thesis, University of Nottingham. ventilation natural ventilation ventilation stacks wind |
| spellingShingle | ventilation natural ventilation ventilation stacks wind Wang, Bo Unsteady wind effects on natural ventilation |
| title | Unsteady wind effects on natural ventilation |
| title_full | Unsteady wind effects on natural ventilation |
| title_fullStr | Unsteady wind effects on natural ventilation |
| title_full_unstemmed | Unsteady wind effects on natural ventilation |
| title_short | Unsteady wind effects on natural ventilation |
| title_sort | unsteady wind effects on natural ventilation |
| topic | ventilation natural ventilation ventilation stacks wind |
| url | https://eprints.nottingham.ac.uk/11653/ |