Summary
The purpose of this study is to investigate the loads and lengths of the pull-down periods (the time used to achieve a comfortable thermal environment before a room is ready for occupation) with mixing ventilation, displacement ventilation and stratum ventilation. In a typical classroom in Hong Kong, experiments begin with the same initial hot thermal environment. Based on ASHRAE 55-2010, ISO Standard 7730 and literature, existing indices PMV, PD and ADPI, calculated from measured data, are used as the thermal comfort criteria to determine the end of the pull-down period. The results indicate that stratum ventilation outperforms the other two air distributions during the pull-down period in terms of rapidity and energy consumption. For the rapidity of the pull-down process, mixing ventilation spends a shorter time than displacement ventilation, while stratum ventilation spends less than half of the time the other two spend. The average pull-down load of stratum ventilation is only around a quarter of that of mixing ventilation or displacement ventilation, The exergy consumption of the chilled water used for the pull-down of stratum ventilation is also lower than that of the other two distributions.
Details
- Original title: An experimental investigation into the pull-down performances with different air distributions.
- Record ID : 30017145
- Languages: English
- Source: Applied Thermal Engineering - vol. 91
- Publication date: 2015/12/05
- DOI: http://dx.doi.org/10.1016/j.applthermaleng.2015.08.012
Links
See other articles in this issue (57)
See the source
Indexing
- Themes: Comfort air conditioning
- Keywords: Exergy; Energy consumption; Ventilation; Performance; Expérimentation; Thermal comfort; Air distribution
-
Experimental study on the thermal environment o...
- Author(s) : LU J., LI X., ZHAO B.
- Date : 2002
- Languages : English
- Source: ASHRAE Transactions. 2002 annual Meeting, Honolulu, Hawaii. Volume 108, part 2 + CD-ROM.
View record
-
Perspektiven einer effizienteren Energienutzung...
- Author(s) : SCHMIDT D.
- Date : 2008/11/19
- Languages : German
- Source: Deutsche Kälte-Klima-Tagung: 2008, Ulm.
View record
-
Air tightness assesment of buildings from the p...
- Author(s) : FÜLÖP L., KOŠKI Ž., MAGYAR Z.
- Date : 2013/06/16
- Languages : English
- Source: Clima 2013. 11th REHVA World Congress and 8th International Conference on Indoor Air Quality, Ventilation and Energy Conservation in Buildings.
- Formats : PDF
View record
-
Design of localised ventilation.
- Author(s) : MELIKOV A. K.
- Date : 1999/09/19
- Languages : English
- Source: 20th International Congress of Refrigeration: Refrigeration into the Third Millennium.
- Formats : PDF
View record
-
Experimental investigation on the local air age...
- Author(s) : WANG F., LI Y., LIU X., et al.
- Date : 2009/05/20
- Languages : English
- Source: ACRA-2009. The proceedings of the 4th Asian conference on refrigeration and air conditioning: May 20-22, 2009, Taipei, R.O.C.
- Formats : PDF
View record