AIVC - Air Infiltration and Ventilation Centre

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displacement ventilation

CFD investigation into gaseous impurities in a shop with displacement ventilation.

One of the reasons for using displacement ventilation is that it may provide better indoor air quality in the occupied zone than conventional mixing ventilation. It is therefore important to understand the importance of the system on this aspect. A validated CFD model was employed to generate concentration distribution data for CO2, radon and moisture in a Hong Kong shop with displacement ventilation. Analysis found that the concentration distribution affected by factors such as the source type and location, its associated plume strength and human body convection, etc.

A comparison between three methods of low-level air supplies.

This paper deals with the performance evaluation of three types of low-level ventilation systems: the wall displacement ventilation, the floor displacement ventilation and the impinging jet ventilation systems. The comparison between the performances of these three systems is based on air movement, comfort assessment, mean age of air and ventilation efficiency for contaminant removal. Data from measurements and CFD simulations are used for comparisons.

A new eye to see the indoor air quality (IAQ) - transport process visualization.

A new method of transport process visualisation is suggested to analyse the fluid flow and heat transfer structures. A two-dimensional displacement ventilation flow model is comprehensively investigated. Results demonstrated that the streamline and heatline visualising means macroscopically exhibit the nature of momentum and heat transfer philosophy, providing a direct insight to see the IAQ.

Concentration distribution in a mixing ventilated room.

Today there is an increasing focus on the importance of a proper ventilation system to obtain good working conditions in the term of air and thermal quality to ensure high productivity. Different ventilation principles are used, e.g., mixing ventilation and displacement ventilation. In order to ensure that the ventilation system meets the demands it is important to know which parameters that influence the performance of the system. In this work the mixing ventilation principle was investigated.

A nodal model for displacement ventilation and chilled ceiling systems in office spaces.

Describes how a nodal model was developed intended to represent room heat transfer in displacement ventilation and chilled ceiling systems. Precalculated air flow rates were used to predict the air temperature distribution and the division of the cooling load between the ventilation air and the chilled ceiling. A network of ten air nodes is used to separately represent the air movements in the plumes and the rest of the room. Calculation of the capacity rate parameters is done by solving the heat and mass balance equations for each node using measured temperatures.

Chilled ceilings and beams.

This month the cost arid research departments of Mott Green Wdll and Davis Langdon & Everest examine the costs and specification of chilled ceilings and beams in collaboration with specialists Trox and Halton.