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User Evaluation
According to the results of the questionnaire, teachers and employees were very satisfied with the indoor air quality.
Percentages of teachers who suffer indoor air problems:
Inadequate ventilation in winter, weekly:
Before renovation 93 %
After renovation 36 %
Stuffy air in winter, weekly:
Before renovation 87 %
After renovation 29 %
Inadequate ventilation in summer, weekly
Before renovation 67 %
After renovation 36 %
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These results show that there were problems before renovation and the main problems have been solved by the ventilation renovation. The indoor air quality has improved. The total energy consumption has increased, anyhow, because the air flow rates have essentially increased, and probably the system is not in balance and the building envelope is leaky (windows). These results shows how important it is to design the renovation procedure taking into account all the factors which may affect the results.
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