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numerical modelling

Experimental and numerical studies on air diffusion in a single office

The study has compared experimental data and numerical simulation of air velocity for a room with jet diffusers to assess comfort conditions in the occupied zone. Comparison was mainly done in planes perpendicular and along the jet axis.Results allow to expand the use of the numerical approach during design to achieve high levels of environmental comfort.

Influence of furniture layout and ventilation design on air quality and thermal comfort

The study presents the influence of three different air diffusion systems and furniture layout on comfort (PMV, PPD) and indoor air quality (ventilation efficiency). Results of CFD calculations have been validated using experimental results for one case on a test rig. Charts are given to help dimensioning.

Design of a ventilation system for an indoor auto-racing complex

A CFD code has been used to design and optimize the ventilation system of a building dedicated to auto-racing (120 000 persons, 45 cars). The constraints are the dimensions of the building, the heat and pollutants due to cars, their high speed and the size of granstands. The article shows the interest of airflow modeling to study the complex ventilation system of such a building.

Modeling the performance of a naturally ventilated commercial building with a multizone coupled thermal/airflow simulation tool

The coupled thermal/airflow simulation software CONTAM97R was used to evaluate the performance of a naturally ventilated office building recently build in Entschede (The Netherlands), for which detailed measurements results within the Natvent project had already been published.

Performance simulations of hybrid ventilation systems in a five-story office building

This study is a part of the Finnish contribution to the HYBVENT project (Annex 35 of IEA). Two 'hybrid' ventilation concepts designed for northern climates were evaluated for a 4300 m2 office building in Helsinki : one of them is low pressure mechanical exhaust with CO2-controlled air inlets ; the other uses mechanical air supply through coils and two parallel exhaust circuit with and without fan and heat recovery. They were compared with conventional systems in Finland (mechanical supply and exhaust with constant or variable air volume).

Application of computer simulated persons in indoor environmental modeling

Different geometries to simulate a person in an indoor environment numerical simulation have been evaluated with respect to local and global air flows, as well as convective heat transfer. Results show that the geometry of the computer simulated person influences only the local flow around it.

Computation of airflow in a displacement ventilation/chilled ceiling environment

This study is to validate a CFD model of displacement ventilation combined with chilled ceiling and determine if this combination may create draught risk or influence badly indoor air quality.

Study on cross-ventilation with radiatonal panel cooling for hot and humid regions

A CFD code was used to study an office equipped with a radiant cooled ceiling and a wind-induced cross-ventilation system. Calculations covered several heights of the ceiling.

An example of verification, validation, and reporting of indoor environment CFD analyses

A procedure to verify, validate and report CFD analyses in indoor environment applications has been developed. The process on how to use this procedure is explained through the example of CFD modeling of an office with mechanical displacement ventilation.

Numerical investigation of transient buoyant flow in a room with displacement ventilation and a chilled ceiling system

Flow and heat transfer calculations have been operated in a typical office room equipped with a displacement ventilation and a chilled ceiling system. Results show quasi-periodic flow when the values of internal thermal loads are high. They also show lateral oscillations of the plumes above heat sources which create after impact on the cold ceiling recirculating flows in the room.

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