09 - Pollution

Achieving a reduction in noise levels where background levels are low - KBCN1692

Where existing background levels are low, such as during night-time, there is no dispensation or flexibility that can be applied in achieving the requirements.  The aim of the issue is to reduce the potential impact of noise from the assessed building to local noise-sensitive buildings.  Acoustic experts have confirmed that the requirements for the background noise levels are still appropriate where existing levels are low, including where a 5dB reduction is stated within the criteria.

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District cooling – Used in combination with local cooling - KBCN1634

Where district cooling can be considered outside the scope of the assessment, either in accordance with the Methodology section of the technical manual or in line with KBCN0759, compliance must be based on calculating the DELC for all systems. However, where the district cooling system is exempt from assessment, as described above, this should be based on a GWP of zero for the district cooling system.

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Pol 01 Prerequisite – Applicable standards - KBCN1537

ASHRAE standards (ASHRAE 15-2016 'Safety Standard for Refrigeration Systems' or ASHRAE 34-2016 'Designation and Safety Classification of Refrigerants') can be used in place of the ISO/EN standards referenced in the prerequisite. This is only applicable to countries outside Europe.

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Scope of issue – clarification – fixed installations - KBCN1660

The scope of this issue covers noise from external building services (or 'fixed installations' as written in the manual) serving areas designed for human comfort. The noise impact assessment excludes:

• Noise from process-related plant.
• Noise from emergency or back-up plant which are not used during normal operation.

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Verification of measurements undertaken by non-SQA - KBCN1661

It is acceptable for individuals who do not meet the BREEAM definition of a suitably qualified acoustician (SQA) for Pol 05 to undertake the testing for this issue, provided the measurements or calculations are verified by a SQA. The SQA must review the report and confirm in writing that they have found it to:

1. Represent sound industry practice
2. Be appropriate given the building being assessed and scope of works proposed
3. Avoid invalid, biased and exaggerated recommendations

Additionally, written confirmation from the SQA how they comply with the definition of a SQA is required.

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