Overheating Analysis for Schools (BB101)

Summer Overheating Indicators

There are three parameters in the standards that provide an indication when overheating is likely to occur. These parameters include:

1. the number of hours for which a threshold temperature is exceeded;
2. the degree to which the internal temperature exceeds the external temperature;
3. the maximum temperature experienced at any occupied time.

The use of the three performance parameters will ensure that the design of future schools is dictated by a combination of factors which will allow a degree of flexibility in the design of the school. They will also take account of the use of the school, for example, a school's choice of term dates.

Compliance Measures

The performance standards for summertime overheating compliance are:

a) There should be no more than 120 hours when the air temperature in the classroom rises above 28°C;
b) The average internal to external temperature difference should not exceed 5°C (i.e. the internal air temperature should be no more than 5°C above the external air temperature on average);
c) The internal air temperature when the space is occupied should not exceed 32°C.

Compliance Requirements

In order to show that the proposed school will not suffer overheating two of these three criteria must be met.