IAQ based demand controlled ventilation (DCV) is the subject of th where CO2 concentration is the subject of that paper where CO2 concentration is used as the controlling index of human produced contamination , and TVOC concentration as the controlling index of building produced contamination.
In this paper , a new index is defined to analyse effectiveness of ventilation systems with different airflow rates CFD simulations are realised with different mechanical exhaust systems in a kitchen. The coupled analysis of this new index and of the airflow rate ratio allows the analysis of the contaminant removal effectiveness while considering the energetic cost of ventilation.
This study examines the effect of building recirculation rates on the concentrations of secondary organic aerosol (SOA) resulting from reactions between indoor limonene and ozone.
HVAC systems in two hotel buildings in Pyongyang have been surveyed from 1997 to 2002 to check the effectiveness of combined mechanical cleaning and duct disinfections against microbial contamination..There were many differences of microbial contamination between the two HVAC systems during 1997-1998. respectively for bacteria and fungi in the air outlet . But they decreased from 45.9 and 28.7 cfu/m3 during 1997-1998 year to 10.3 and 4.5 cfu/m3 during 1999-2002 year
A field campaign lasting June to October 2004 has been organized in the CSTB experimental house MARIA. It aimed at documenting the potential impact of outdoor ozone and NOx on indoor air quality, . Selected new building materials were installed in a test room where ventilation conditions are precisely controlled.Detailed experiments were performed during photochemical pollution episodes , it showed the apparition of ozone-initiated reactions products indoors.
The investigation of the performance of a floor-supply displacement ventilation system with swirl diffusers or perforated panels under a high cooling load situation (90W/m2). Was the objective of this research.Measurements and numerical simulations using a CFD program were carried out to evaluate the performance of the system for a large workshop.That study ranks the impacts of several parameters, such as the air change rate, number of diffusers, and arrangement of exhaust, on the indoor environment
The hybrid ventilation for the independent building has many advantages that are presented in this paper, among them : no recycle ventilation system, reduction of the pollution, energy saving without air quality decreasing.And this type of ventilation system can work with radiant heating (or cooling) .
This paper discusses indoor air quality considerations for office spaces when using VAV system. that provide various supply air rate according to the space loads, especially in multiple spaces, served by a common air handling unit. The ventilation rate procedure and the indoor air quality procedure (the monitoring contaminant concentration method) are used in order to ensure the indoor air quality. A design solution and ventilation control strategy at the fixed outdoor air rate for indoor air quality is provided.
The aim of the project is to study the technical and physical conditions required to ensure satisfactory ventilation in schools with fan assisted natural ventilation . Analyses of the air flows for different combinations of outdoor climates were made. A model was built, the computer calculations with the program PFS and full-scale measurements in school buildings have allowed the study of the performance of the ventilation system in combination with the building. .
A special stategy must be applied to optimize the ventilation rates required in Korean classrooms. The aim of that study was to identify concentration decay by infiltration in a classroom at recess periods and to suggest proper ventilation rate to improve IAQ in the classroom. Classrooms of three schools were evaluated and the results show many interesting aspects of concentration decay patterns affecting door opening at recess period.
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