In order to explain the effect of ventilation systems, the article presents the results of investigations made on a simulation program to calculate the temperature, heat loads, ventilation rates and indoor air quality. The study considered the Japanese daily schedule and the residents behaviour in regard to maintaining comfort. The indicators of indoor air quality were taken to be carbon dioxide, carbon monoxide and formaldehyde concentrations. Three systems were analysed: basic passive ventilation system, a passive stack ventilation system and a mechanical ventilation system.
A study of 132 unoccupied and 60 occupied caravans was conducted to determine levels of formaldehyde and factors which may affect these levels. Repeat monitoring was carried out 6 months later in 50 of the occupied caravans. A questionnaire was also used to assess potential factors associated with the recorded levels. Mean formaldehyde levels of 100 ppb in unoccupied caravans and 29 ppb in occupied caravans were recorded. A negative correlation was found between formaldehyde levels and the age of caravans.
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