English

Air change rate is often used as an important characteristic of indoor environmental quality, which significantly impacts human health. However, easy, effective, real-time and low-cost air change rate measurements in naturally ventilated resident buildings are still a huge challenge. This paper presents a method based on the release of a stable rate of the tracer gas CO2 given off by solid CO2 (dry ice) in an insulated box.  In theory, the dry ice will sublime at a constant rate as long as there is sufficient dry ice in the box.

In typical Chinese commercial kitchens, the large amount of heat and moisture that is generated must be removed. The ventilation and energy consumption rates can be huge. Middle and small scale commercial kitchens in China produce an exhaust airflow rate so large that without a reasonably effective ventilation system, the temperature and contaminant concentrations are far more than acceptable levels. To fulfil all the requirements of indoor air conditioning in an economical manner, a new air distribution pattern called air curtain ventilation (ACV) is presented in this study.

This paper reports an investigation into the ability of the air supply in non-unidirectional cleanrooms to aid recovery from episodes of airborne contamination, and minimise airborne contamination at important locations. The ISO 14644-3 (2005) recovery test, which measures the rate of decay of test particles, was assessed and a reinterpretation of the test results suggested. This allowed air change effectiveness indices to be calculated and used to evaluate the ventilation effectiveness of the cleanroom’s air supply.

Mr.Platts briefly reviews current Canadian housing and the potential for controlled ventilation with exhaust air heat recovery. Discusses cost effectiveness of exhaust air heat recovery and suggests that payback periods are generally too long and hence uneconomic. Mr.Bonnyman discusses the market for domestic heat recovery units. Briefly reviews the types of heat recovery equipment. Gives product information for units available in Canada.

The Proceedings of the DBR Seminar/Workshop October, November 1977 and January 1978

The eighth issue of the AIVC newsletter was out in September 2015. Its contents include:

Ventilative cooling (VC) is a way to cool or to prevent overheating in a building by means of ventilation rates higher than hygienic ventilation rates. To this end, natural (such as windows, vents, louvers) as well mechanical (extract or supply fans) ventilation devices can be used.

There is a growing concern about the effects of indoor air particulate pollution, in relation to human health. The removal of indoor air pollution at its source is extremely difficult. Fine particles are continuously generated in outdoor air mainly by combustion processes. Coarse particles are constantly generated by activities indoors. There is a need for simple technology that can reduce these types of pollutants, which can work in conjunction with standard heating, ventilation and air conditioning (HVAC) systems.

The Proceedings of the 35th AIVC Conference "Ventilation and airtightness in transforming the building stock to high performance", held in Poznań, Poland, 24-25 September 2014.

The Presentations at the 35th AIVC Conference "Ventilation and airtightness in transforming the building stock to high performance", held in Poznań, Poland, 24-25 September 2014.