English

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.

This session will discuss the major changes of the ventilation standards supporting the implementation of the Energy Performance of Buildings Directive recast. It is foreseen that some of these standards will serve as basis of future ISO standards as well.

Numerous tests are being performed throughout Europe. While most are or appear to be successful others have high calculated uncertainty values and others don’t correlate well when repeated by the same tester with the same equipment or where someone else does the repeated test. Some feel that equipment calibration is the key to consistent results but in most cases that it could be one of the smallest causes for lack of repeatability. We will take a look at how much different factors affect results and how to get the best results.