Performance Analyse of Air Mixed and Displacement Ventilatilation System in Office Room Base on Computational Fluid Dynamic

Bambang Iskandariawan, Paulus Indiyono, Herman Sasongko, Prabowoa Prabowo


Air ventilation system is required for improvement as well as maintenance room air circumstance which is always clean in the whole day. Effective ventilation will enhance thermal comfort and indoor air quality therefore the productivity of occupant is expected also becomes mo-re intense. This research deals with the influence of supply air diffuser position concerning to thermal comfort and in-door air quality viewpoints. It is inspected four categories of air ventilation system: mixed and displacement ventila-tion used for air supply diffuser position in the centre and at the side of the room. Thermal comfort aspect is demons-trated through velocity and temperature of the room air without considering the value of relative humidity and room surface temperature average). On the other side the indoor air quality is focused on the intensity of the CO2 gas concentration which is appear inside the room gas. It applies Fluent 6.2 as computational fluid dynamics (CFD) simulation, some research variables are exploited. Office room model is generated in GAMBIT software create par-ticular office room design. Analyse result prove that the displacement centre ventilation system has more capability in the handling of room heat in addition to contaminant gas compare to the others.


Ventilation; Mixed; Displacement; Diffuser, CFD Fluent

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Holmberg, R.B., K. Folkesson, L.G. Stenberg and G. Jansson. 1987, “Experimental Analysis of Office Climate Using Various Air Distribution Methods”. Proceedings of ROOMVENT 1987.

Kristensson, J.A. and Lindqvist, O.A. 1993, “Displacement Ventilation Systems in Industrial Buildings”, [Conference Paper] ASHRAE Transactions. Publ by ASHRAE, Atlanta, GA, USA. V 99 pt 1 p 992-1008.

Chen, Q. 1988, “Indoor Airflow, Air Quality and Energy Consumption of Buildings”. Ph.D. Thesis, Delft University of Technology, The Netherlands.

Stymne, H., Sandberg, M. and Mattsson, M. 1991, “Dispersion Pattern of Contaminants in a Displacement Ventilated Room”, Proocedings of the 12th AIVC Conference.

Mundt, E. 1996, “The Performance of Displacement Ventilation Systems ”, Ph.D. Thesis, Royal Institute of technology, Sweden.

King, A.R., Kronfalt, M. & Clements, R.F. 1993, “Stratified Air Conditioning of Large Spaces with High Heat Loads”, Australian Refrigeration, Air conditioning & Heating 47 n 2, 24-29.

Skistad, H. 1994, “Displacement Ventilation”, Research Studies Press Ltd. England.

Hu, S., Chen, Q. & Glicksman, L.R. 1999, “Comparison of energy consumption between displacement ventilation systems for different U.S. buildings and climates”, ASHRAE Transactions 105 (PART 2), 453-464.

Nielsen, P.V. 1994, “Stratified Flow in a Room with Displacement Ventilation and Wall-Mounted Air Terminal Devices”, ASHRAE Transactions, ASHRAE, Atlanta, GA, USA, 1163-1169.

Nielsen, P.V. 1996, “Temperature Distribution in a Displacement Ventilation Room”, Proceedings of ROOMVENT 1996 (3); 323-330.

Mattsson, Magnus. 1999, “On The Efficiency of Displacement Ventilation with Particular Reference to The Influence of Human Physical Activity”, Doctoral Thesis, Centre for Built Environment Royal Institute of Technology Gavle, Sweden.

Yuan, X., Chen, Q. and Glicksman, L.R. 1999a, “Models for Prediction of Temperature Differences and Ventilation Effectiveness with Displacement Ventilation”, ASHRAE Transactions 105 (PART 1), 353-367.

Xu, M., Yamanaka, T. & Kotani, H. 1999, “Vertical Temperature gradient and Ventilation Efficiency in Rooms with Displacement Ventilation – Influence of Supply Air Temperature and Heat Load”, Technology Reports of Osaka University 49 n 2348, 179-188.

A Yuan, X., Chen, Q. and Glicksman, L.R. 1998, “Critical Review of Displacement Ventilation”, ASHRAE Transactions, ASHRAE, Atlanta, GA, USA, 78-89 4101.

Yuan, X., Chen, Q. and Glicksman, L.R. 1999b, “Performance Evaluation and Design Guidelines for Displacement ventilation”, ASHRAE Transactions 105 (PART 1), 340-352.

Iskandriawan, Bambang. 2001, “Displacement Ventilation of Rooms Containing Point Sources of Heat”, Master Dissertation, University of Wollongong, Australia.

Waters, JR and Simons, MW. 2002, “Modelling Ventilation by means of Combined Mixing and Displacement Flow”. Building Serv. Eng. Res. Techol. 23,1, pp, 19-29.

Lau, J. And Chen, Q. (2007), “Floor Supply Displacement Ventilation for Workshops” Building and Environment, 42 (4), 1718-1730.

Awbi, H.B. (1995), “Ventilation of Buildings” E & FN SPON an Imprint of Chapman & Hall.

Manual Fluent file:///C:/Fluent.Inc/fluent6.2.16/help/html/ug/node1034.htm#168972



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