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The objective of the present study is to measure the change in the concentration of CO-2 and water vapour in a dwelling. The measurements have been interpreted as a function of the behaviour of the occupants, to verify the possibility and the merits of employing one of these two concentrations to control completely or partially a mechanical or natural ventilation system. In fact, an earlier theoretical study carried out by BERTIN with the aid of the E.E.C. shows that the modulation of the ventilation flow rate with time would make it possible to obtain a mean flow rate over the heating period of 0.6 vol/hr, with flow rates greater than 2 vol/hr when the occupation detector requires it, and lower than 0.2 vol/hr (leakage from the house) when the dwelling is not occupied. This modulation, which is obtained by the control of a two-speed fan in the case of a MDV (Mechanical Draught Ventilation), and through the modulation of the chimney cross-section in the case of natural draught, enables the ventilation flow rate to be made independent of the external conditions (wind, temperature) and to produce annual energy savings of the order of 1,500 to 2,000 kWh, for a 100 m-2 house. The installation cost of a mass produced detector (50,000/year) should be two times lower than the installation of a double flow heat exchanger. Applied measures have shown the validity of CO-2 as a pilot (key) parameter for ventilation and brought a verification of the economies realized. Characteristics of a CO-2 detector of low cost have been defined.

Additional information

Bibliographic Reference: EUR 8995 FR (1984) MF, 96 P., BFR 120, BLOW-UP COPY BFR 480, EUROFFICE, LUXEMBOURG, POB 1003
Availability: Can be ordered online
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