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air movement

An intermediate model to predict thermal comfort and air quality in a building.

In this paper, a zonal model used to predict the air movement, temperature distribution and airquality in a room is presented. It is based on a rough partitioning of the room: it is anintermediate approach between one-node models (that consider an homogeneous temperaturein each room, and, for that reason, do not permit to predict the thermal comfort in a room) andCFD models (that require great amount of simulation time). Where plumes, jets or thermallayers occur, air flow is described by empirical laws.

Calculation of air infiltration in buildings and the movement of the air inside buildings corrected by heat transfer.

The purpose of this work is to evaluate the air infiltration through the high buildings and in the same time to determine the exchange of the air between the rooms and the influence of the heat transmission for these exchanges. The method of approach for this problem is a network model. This is a grid system in which the nodes are the rooms or zones of the building and the connection between two nodes simulates a flow path of a given resistance. It was built a computer program for predicting the interactions between different zones which was applied for a given case of a building.

Indoor air quality and infection problems in operating theatres.

There is a risk that patients can catch a range of infections during any stay in a hospital. A recent UK Office of Health Economics report highlighted that 10% of in-patients contract a hospital acquired infection from one source or another. There are many sources of infection but one specific route is via the surgical wound during an operation. Bacteria can be carried from the source to the wound site by currents of air causing post-operative infection at a later date.

Effect of interior partitions on the air movement and air quality in a room with mixing ventilation.

Working spaces in modem buildings are easily formed by interior partitions because these buildings have been designed and constructed as open spaces for flexibility. This could lead to an indoor environment which might be different from the intended design. In this study, the effect of partition on the indoor air quality in a model room has been investigated with different configurations such as the height of' partition and the gap between partition and floor.

Effects of non-isothermal and intermittent air movement on human thermal responses.

Twenty-four college students are asked about their subjective responses to a dynamic thermal environment with non-isothermal and intermittent air movement. The subjects wear an uniform of 0.6 clo and are sedentary. A rotative air jet can cyclically sweep over the subjects with adjustable air velocity. Each experiment lasts 150 minutes and is performed with three stages.

Fire issues for natural ventilation.

Predicting the movement of smoke in a naturally ventilated building is a difficult process for architects and design engineers alike. A software model developed by the Fire Research Station may provide a solution.

A continuous time dynamic model of temperature in air conditioned rooms.

The numerical evaluation of room air movement is made by systematic discretization of space and the dependent variables. This makes possible to replace the governing differential equations with simple algebraic equation. The dynamic model of the temperature is based on the energy balance equation, considering a given flow field. The temperature in a given control volume depends on the temperatures of its corresponding neighbours. This form of the model is. not appropriate for control theory.

Virtual Environment for the Prediction of Air Movement in Buildings

This paper introduces the infrastructure of Microflo CFO modelling system in conjunction with the virtual simulation environment. The theoretical basis is described and particularly the graphical user interfaces for pre and post processing are described in detail. Features of the Microflo system are further demonstrated through its application in the design projects.

Effects of a Ventilation Duct on the Performance of a Fume Cupboard

When a fume cupboard is placed in a room with a ventilation duct, the air movement inside and around the fume cupboard is fully three-dimensional turbulent flow. However, in order to understand the fluid flow away from the fume cupboard a much simpler model can be used. This leads to a steady 20 model, with the computational domain including only the sash of the fume cupboard, the room and the entrance into the ventilation duct. In this paper we have used both the k-E turbulence model and the wall function technique to calculate the steady 20 turbulent fluid flow.

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