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Regulation 25A – Consideration of high-efficiency alternative systems for new buildings

Regulation 25A came into force on 9th July 2013 and states that consideration must be made of the technical, environmental and economic feasibility of using high-efficiency alternative systems; such as the following:

Decentralised Energy Supply systems based on energy from renewable sources
Cogeneration
District Heating or Cooling
Heat Pumps

Put simply, before any work can begin on a site a feasibility study into the use of any or all of these systems must be undertaken, documented and available to the building control body to view. Although a study must be undertaken to assess the feasibility of these options, there is no legal obligation to install any of these systems (although some local authorities will insist on these in certain instances under local planning conditions).

GreenFish Consulting have years of experience within the compliance sector and have been providing these specific studies since their inception. We can provide competitive pricing for your site, either as a one-off service, or combined with our Thermal modelling and Part L Compliance services.

BB101 COMPLIANCE – VENTILATION OF SCHOOL BUILDINGS

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 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.

Thermal Comfort:
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, i.e., 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, i.e., the internal temperature must be no higher than 5K above the external temperature on average.

Air Quality:

Where mechanical ventilation is used, a daily average concentration of CO² must not exceed 1000ppm and 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 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.

SERVICES:

Regulation 25A – Consideration of high-efficiency alternative systems for new buildings

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