We at GreenFish Consulting use IES’ Virtual Environment Software to thermally model the building to assess compliance with BB101, reporting on all aspects of thermal comfort and CO² densities within teaching spaces. We are also able to combine this service with a Part L assessment or other thermal modelling services.
BB101 has been updated and is due to be renamed, however new compliance guidance can be found within the Facilities Output Specification of the Priority Schools Building Programme (PSBP) Set up by the Education Funding Agency (EFA). It is based upon CIBSE’s TM52: The Limits of Thermal Comfort and KS16: How to manage overheating in Buildings The requirements are as below.
- 1. There must be less than 40 hours per year for which the expected indoor temperature exceeds the target daily maximum.
- 2. The daily-weighted exceedance must be no more than six, ie the number of hours a day that the temperature is above the design maximum, multiplied by the amount it is above, must be <=6
- 3. Indoor operative temperatures must not exceed 4K above the target maximum
Two out of the three above must be met to satisfy the requirements, along with the following mandatory criteria
The average internal to external temperature difference must not exceed 5K, ie. The internal temperature must be no higher than 5K above the external temperature on average.
Where mechanical ventilation is used a daily average concentration of CO² must not exceed 1000ppm and so the maximum concentration must not exceed 1500 ppm for more than 20 consecutive minutes.
Where natural ventilation is used the average concentration of CO² must not exceed 1500 ppm and so the maximum concentration must not exceed 2000 ppm for more than 20 consecutive minutes.
Additional regulations must also be met for specialist areas such as science laboratories and food technology rooms where higher air change rates are needed.Contact us about BB101 Compliance – Ventilation of School Buildings