| EPSRC Reference: |
GR/R81275/01 |
| Title: |
Investigations of Positive Air Pressure Transients in Building Drainage Vent Systems |
| Principal Investigator: |
Jack, Professor L |
| Other Investigators: |
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| Project Partners: |
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| Department: |
Sch of the Built Environment |
| Organisation: |
Heriot-Watt University |
| Scheme: |
Fast Stream |
| Starts: |
06 January 2003 |
Ends: |
05 January 2006 |
Value (£): |
62,541
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| EPSRC Research Topic Classifications: |
| Building Ops & Management |
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Summary on Grant Application Form |
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The use of the single stack drainage system has long been recognised in the UK as a means of providing a route for waste removal from sanitary appliances. It is known that as appliances discharge into the vertical stack, an annular water flow is formed which entrains an associated air flow. The unsteady nature of this flow continuously generates low amplitude air pressure transients which have the potential to deplete or destroy the appliance trap seal, thereby permitting foul odour to enter the habitable space. The probem of suction (negative) pressure transients has been the focus of a coherent programme of research however, often neglected are positive air pressure transients. Trap seal depletion due to positive transients appears to be increasing and represents a significant barrier to system simplification.This research will investigate the generation, duration and propagation of positive air pressure transients and will assess the effect of a range of associated factors on trap seal depletion. Investigations (essentially laboratory based but including site data whenever possible) will develop a transient loss coefficient representative of water curtain formation at the base of the stack. This will include variables representative of the pipework configuration. The resultant code will then act as a 'plug-in' to the Heriot-Watt University model, AIRNET, allowing complete systems to be analysed andl facilitating the assessment of the impact upon codes and legislation of the research findings and of changing usage patterns and discharge profiles.
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Key Findings |
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This information can now be found on Gateway to Research (GtR) http://gtr.rcuk.ac.uk
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Potential use in non-academic contexts |
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This information can now be found on Gateway to Research (GtR) http://gtr.rcuk.ac.uk
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Impacts |
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| Description |
This information can now be found on Gateway to Research (GtR) http://gtr.rcuk.ac.uk |
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Sectors submitted by the Researcher |
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This information can now be found on Gateway to Research (GtR) http://gtr.rcuk.ac.uk
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| Project URL: |
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| Further Information: |
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| Organisation Website: |
http://www.hw.ac.uk |