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displacement ventilation

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.

Natural ventilation in an enclosure induced by a heat source distributed uniformly over a vertical wall.

A simple multi-layer stratification model is suggested for displacement ventilation in a single-zone building driven by a heat source distributed uniformly over a vertical wall. Theoretical expressions are obtained for the stratification interface height and ventilation flow rate and compared with those obtained by an existing model available in the literature. Experiments were also carried out using a recently developed fine-bubble modelling technique.

CFD and virtual reality in the built environment - a case study of displacement ventilation.

Computational Fluid Dynamic (CFD) has rapidly developed as an industrial design and evaluation tool for Building Services Engineering. Providing valuable information via mathematical predictions of fluid flow heat and mass transfer. The aim of the work is to illustrate the integration of CFD data into a truly interactive Virtual Reality (VR) environment to provide engineers with demonstrable design evaluation and visualisation facilities. To demonstrate the successful integration of CFD and VR an industrial case study of a conference room at Hoare Lea is presented.

Partial cooling in a naturally ventilated building in the tropics.

The objective of this project was to provide cool working conditions for a small number of Customs Department staff in a turn-of-the-century heritage building in Town ville at 19° S latitude. A ducted air conditioning system was initially proposed but rejected as it would have been incongruent with the Victorian elegance of the space, as well as its high cost. As the working area in the three storey high space was surrounded by ornate timber counter and partitions, a scheme was developed using fan coil direct expansion units. These were located behind the counter to the public space.

A note on the thermal comfort in displacement ventilated classrooms.

19 university students were asked about their thermal comfort while attending ordinary lessons in a displacement ventilated test room of typical classroom size. Two different ceiling heights were tested. Both the general temperature level and the strength of the vertical temperature stratification in the room increased continuously during the lessons due to the presence of the students, however slower with the higher ceiling.

Simulation of mixed convection flow in a room with a two-layer turbulence model.

Most indoor airflows are mixed convection. In order to simulate mixed convection accurately and efficiently, this paper uses a two-layer turbulence model. The two-layer model combines a one-equation model for near wall flow together with the standard k-E model for outer-wall flow. The model has been used to predict the mixed convection by displacement ventilation in an office. The computed results agree well with the corresponding airflow pattern and the distributions of air temperature , air velocity, air velocity fluctuation, and tracer-gas concentration.

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