© 2014 ASHRAE. Displacement ventilation has been traditionally limited in its application, due to its relatively lower cooling capacity compared with admixture ventilation. Except in the case of assembly halls, theatres and buildings of this type, displacement ventilation has been limited in high ceiling spaces applications due to the stratification associated and its effect on the comfort criteria in the occupied zone. However, the advantages of displacement ventilation with ceiling heights of over 3.5 m (11.48 ft) are well known, such as a higher cooling capacity, acceptable comfort and air quality levels and reduced specific airflow rates. This paper discusses an issue of capital importance associated with the proper design of displacement ventilation in tall spaces with duct-free ceilings, such as determining the optimum point of airflow return so as to ensure acceptable comfort levels, minimize unwanted additional radiation loads from overheated ceilings and avoid undesirable temperature gradients in the occupied zone. A practical case is studied, where it is also mentioned how the application of this system can be successfully achieved when combined with supplementary non-displacement airflow patterns in order to reduce the impact on the performance of the displacement ventilation due to the building fabric and envelope design such as higher glazing surfaces.
|Number of pages||8|
|Publication status||Published - 1 Jan 2014|
|Event||conference - |
Duration: 1 Jan 2014 → …
|Period||1/01/14 → …|
Galvez-Huerta, M. A., Gil-Lopez, T., Castejon-Navas, J., & Gomez-Garcia, V. (2014). 1st International Conference on Energy and Indoor Environment for Hot Climates. 168-175. Paper presented at conference, . https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=84938855963&origin=inward