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- Nordquist, Birgitta
(author)
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Air flows in a school with fan-assisted natural ventilation, with the focus on the opening of the exhaust windows
- 2008
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In: Proceedings of Indoor Air 2008. ; Paper ID 541
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Conference paper (peer-reviewed)abstract
- In schools the air flow is one of the most important factors with regard to the well-being and performance of the children. Some school buildings have a fan assisted natural ventilation system. In some buildings windows are the only exhaust air component. The teachers can be requested to take an active part in the control of these ventilation systems. The objective is to examine the air flows and air directions when the exhaust windows are in different positions. This is studied by computer calculations with the program PFS. The results show that when all openings are opened as intended the required air flows are attained. When exhaust openings are opened in an unintended position, cases with very low or reverse air flow may occur. The position of the exhaust openings seems to be significant for the amount of supply air flow, implying that the position of the exhaust openings should be carefully monitored.
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| 2. |
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| 3. |
- Nordquist, Birgitta, et al.
(author)
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Analysis of fan-assisted natural ventilation in schools
- 2005
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In: Indoor Air 2005: Proceedings of the 10th International Conference on Indoor Air Quality and Climate, Vols 1-5. ; , s. 1284-1288
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Conference paper (peer-reviewed)abstract
- During the last decade, a new design of schools with fan assisted natural ventilation has been introduced. Experience and knowledge of this type of ventilation system is therefore needed. The objective of the project is to study the technical and physical conditions required to ensure satisfactory ventilation. The whole project includes analyses of the air flows for different combinations of outdoor climates. In this paper the performance of the ventilation system in combination with the building is studied by computer calculations with the program PFS and full-scale measurements in school buildings. A model is built and can be used in the design phase when orders of magnitude are of interest. The significance of different design features can be studied making it possible to change or alter the final design. The breaking point when an auxiliary fan is needed in terms of air flow rate can be determined with the model. Comparison with measured air flows shows that the model gives results which are valid.
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| 4. |
- Nordquist, Birgitta
(author)
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Heating and Cooling of the Supply air in Fan-assisted Natural Ventilation
- 2009
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In: AIVC, Proceedings of the 30th AIVC Conference.
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Conference paper (peer-reviewed)abstract
- In schools the temperature of the indoor air is one of the most important factors in terms of the indoor climate. The resulting indoor air temperature is depending on many factors; the temperature of the supply air being one of the more significant one. One fan-assisted natural ventilation system includes a supply air system where the outdoor air should be passively heated respectively cooled when passing components in the ground before it is supplied to the classrooms. The objective is to examine the ability of the supply system to transfer heat to/from the outdoor air. This has been studied by measurements of the air temperature at several measurement points in a real school building. The results show that the supply air system has an ability to heat respectively cool the outdoor air. The heat transfer results in a supply air temperature within a rather narrow interval, regardless of outdoor air temperature. The consequence of cooling hot humid air leads to high relative humidity which means that a risk for mould growth may occur which should be avoided. This must be observed and handled if designing this form of system.
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