For that study a CFD steady state computational model of a public transport interchange (PTI) in Hong Kong has been used for the investigation and prediction of the typical pollutant emission pattern for buses. The effectiveness of displacement ventilation (DV) scheme often used for PTI, for the removal of pollutants, has been investigated with the numerical simulation. An alternative model is then proposed with a different location of supply and exhausts to improve thermal comfort and IAQ.
The development of a low order model is outlined in this paper, it can be used for control purposes , and for the quantification of ventilation performance in ventilated systems. First, numerical simulations allowed the generation of an informative pollutant transport data . Then a low order transfer function model was built. The obtained results show that first order model can sufficiently describe the dominant mass transfer dynamics in the ventilated air space.
Multizone models have already been developed to predict airflow and pollutant transport between rooms , and zonal models too to calculate airflow and temperature distribution within single rooms.For that study, a zonal model has been placed within a multizone model to take advantage of those two types, the aim is to increase resolution in the prediction of local air flow velocities, temperature and concentration distributions between and within rooms.Theory and methods are presented in that paper.
OA supply rates are often poorly controlled, but accurate measurements of OA flow rates are necessary. This paper describes results of tests of three technologies that perform well and advises on how those technologies should be applied. Conclusions are presented.
This paper provides an overview of mixed-mode buildings, and some of the research that is investigating their performance is described. Case studies are presented along with control strategies, analysis methods energy monitoring and collaborative design process.
This paper describes first the specific challenges associated with adapting performing arts buildings for natural ventilation. The interventions in three such buildings are reviewed, the aim was to reduce their dependance on mechanical system, and to improve their thermal comfort. The ventilation and control strategies devised are reported along with the difficulties encountered during the design developement and the final performance.
This study is part of an ongoing investigation concerning an innovative technology for whole house ventilation. An experimental whole house low energy ventilation system has been installed in dwellings located in Denmark and Poland for tests and control. A CFD analysis and a simulation were made too. The results have been compared , the low values suggested by simulations and achieved by "air supply' windows have been confirmed by the monitored results.
In the airtightness testing industry, the upper limit for large buildings to be tested was 5000 m2. The feasibility of testing very large buildings, over 5000 m2, with a steady state fan technique has been questioned and the authors of that paper have tested and proved the technical feasibility of this equipment. The development, calibration and application of a 2 m diameter fan pressurissation system is demonstrated in this paper.
Experimental and theoretical investigations along with CFD modelling considerations are discussed in this paper to evaluate the performance of a square section wind catcher/tower turret system for natural ventilation.The modelling results tally with the experimental results at lower wind speeds. Wind catchers are innovative techniques, their performance greatly depends on wind conditions. They should be designed as an integral part of the design of the HVAC system in an hybrid or mixed mode operation.
This paper describes an approach that has been undertaken to improve the airtightness of a number of plasterboard-lined load-bearing masonry dwellings that were constructed in the early 1970s. Such dwellings are likely to be broadly representative of many of the dwellings that will be refurbished in the UK over the next decade or so. The airtightness of the dwellings was improved by
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