Abstract
Diffuse ceiling ventilation system is an air distribution system in which part of the suspended ceiling made of perforated panels is used as an air diffuser for the supply of fresh air. This method has been proven to have a higher cooling capacity compared to conventional air distribution systems. The cooling capacity of the system, however, depends on several parameters. This paper presents evaluation results regarding the cooling capacity of the diffuse ceiling ventilation system in connection to two essential parameters, i.e. the distribution of heat sources in the room and the ratio of perforated to non-perforated panels in the ceiling. The evaluation is based on full-scale experiments performed in a laboratory controlled environment and using a design chart which expresses the limits on the supply airflow rate and temperature. The experimental results indicate that the highest cooling capacity is achieved when the heat sources are distributed evenly and the perforated panels cover the entire ceiling. In the case of partial coverage, the cooling capacity is reduced when the heat sources are placed below the perforated panels. The system can have a higher cooling capacity in the partial coverage configuration compared to the full coverage one depending on the supply airflow rate.
Highlights
Diffuse ceiling ventilation systems are air distribution systems in which outdoor air is supplied to the occupied room through the perforated panels installed in the ceiling
The evaluation is based on full-scale experiments performed in a laboratory controlled environment and using a design chart which expresses the limits on the supply airflow rate and temperature
The whole or part of the ceiling is covered by diffuse panels and outdoor air is distributed in a wide plenum between the diffuse panels and the ceiling slabs
Summary
Diffuse ceiling ventilation systems are air distribution systems in which outdoor air is supplied to the occupied room through the perforated panels installed in the ceiling In these systems, the whole or part of the ceiling is covered by diffuse panels and outdoor air is distributed in a wide plenum between the diffuse panels and the ceiling slabs. Nielsen and Jakubowska analysed and compared the cooling capacity of the diffuse ceiling inlet with five other air distribution systems [3] These experimental results show the ability of diffuse ceiling to handle highest thermal loads compared to all the other systems
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