RESEARCH ON FRESH AIR CHANGE RATE - 1. OCCUPANTS' INFLUENCE ON AIR CHANGE
Knowledge of air-change in dwellings under conditions of use is a prerequisite for calculation of energy consumption for space heating and for evaluation of a dwelling's indoor climate. This report deals with the first series of measurements of air-change in occupied dwellings. The measurements were conducted in a total of 25 dwellings, over an aggregate period of 205 days. Not until 1981, when the first complete sets of air-change measurement equipment capable of continuous registration had been fully developed, was it possible to measure air change in dwellings during occupancy. The measuring principle applied is "the method with constant concentration of tracer gas". The measurements conducted show that the occupants exert a very considerable influence on the total air change in the dwelling. The air change for occupied dwellings is, on average, 3 + 4 times greater than air change in sealed buildings (i.e. with air escape valves, doors, windows and ventilation systems closed). The average air change for the sealed dwelling is 0.19 times per hour. Even though the average air change for occupied dwellings is higher than the rate normally recommended, some 20 % of dwellings have, nevertheless, an extremely low rate of air change. The measurements also reveal a trend indicating a higher rate of air change in mechanically ventilated dwellings than in naturally ventilated dwellings. The calculations performed on natural ventilation systems show that air escape valves with apertures of 30 cm**2 per room are not adequate to create the requisite air-change for sealed dwellings.
Bibliographic Reference: EUR 9930 EN (1985), MF, 222 P., BFR 450, BLOW-UP COPY BFR 1110, EUROFFICE, LUXEMBOURG, POB 1003
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Record Number: 1989124045300 / Last updated on: 1987-01-01
Available languages: en