The potential for using a large eddy simulation (LES) computational fluid dynamics (CFD) model to analyze building indoor air quality (IAQ) and ventilation problems was investigated. The LES model was developed by the Fire Science Division of NIST to simulate the transport of smoke and hot gases during a fire in an enclosure.
Fifty six office buildings in nine European countries were audited during the heating season of 1993-1994 using an agreed upon procedure to investigate the indoor air quality and energy consumption. The results of this IAQ-Audit project show that the largest indoor pollution sources in office buildings are construction materials furnishings and indoor activities, immediately followed by the HV AC systems themselves. Thus, priority must be given to source control.
Design for good indoor air quality IAQ) aims to prevent occupant discomfort, irritation, and illness. Sick building syndrome symptoms, discomfort and irritation can easily be the result of other, non-IAQ environmental variables. There is evidence that many such symptoms or complaints result from noise, poor lighting, lack of privacy or control, and other environmental factors that can cause these symptoms and complaints.
Increased building indoor air quality (IAQ) complaints due to reduced outdoor air ventilation rates led to ASHRAE Standard 62-1989. Even though the stipulated total outdoor ventilation flow rate may be drawn into the HV AC system, thermal imbalances in the various zones of the building can lead to certain zones being starved of the specified ventilation flow rate thereby creating localized IAQ problems.
A new version of the ASHRAE's Standard 62, which concentrates on ventilation and indoor air quality
issues, has recently been released for pubIic review. What elements have.changed from the 1989 edition?
HVAC system designs must address both high indoor air quality as well as energy efficiency as the awareness of and demand for proper air quality increases. Economic considerations such as installation and operating costs have impaired many conventional system designs to the point of compromised indoor air quality. This paper discusses many HVAC design parameters that arc critical to achieving adequate indoor air quality.
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