Energy-saving improvements in the thermal properties of buildings often have an adverse effect on indoor air quality, leading to risks of structural deterioration. In these cases, the air change rate inside dwellings must be increased while ensuring that flued gas appliances continue to function correctly. The proposed ventilation system is a cross between natural draught and controlled mechanical ventilation. It activates natural ventilation of the dwelling by means of the induction principle.
This report describe the thermal performance and air distribution of a Kumamoto prefecturalindoor sports ground in Japan. The swirling flow type natural air ventilation system wasadopted in combination with environmental symbiotic technique, and attempts was made topositively harmonize the system with the environment. In the measurements, emphasis wasput on the identification of thermal environment and on the verification of the swirling flowtype natural air ventilation system.
This paper presents the experimental results of the comparative study of three Passive Cooling Systems (PCSs) for the natural conditioning of dwellings carried out in Maracaibo, Venezuela. An experimental platform has been built to study the thermal performance of PCS. It includes: two full scale test cells, a meteorological station and an automated data acquisition system. The results are analyzed in terms of Indoor Characteristic Temperatures (JCT), Mean Cooling Potential (MCP) and the Cooling Performance Index (CPI) of each PCS.
The influence of a thermal heterogeneity boundary conditions on the air change efficiency (ACE) of a mechanical ventilation system in a test room was experimentally evaluated by means of the "step-down" tracer gas technique in 24 different experimental conditions. The experiments were performed under isothermal condition, varying the air supply temperature with respect to the walls and varying the surface temperature of a wall with respect to the other walls and the supply air, simulating both heating and cooling situations.