BREEAM NOx emissions
 Aim and benefits
There is slight variance to this aim in BREEAM International, where fully electrically heated premises are awarded the credits by default as there are no on site emissions.
 When to consider
 Stage 2
Mechanical Engineer calculates that their concept achieves credits. They tell BREEAM assessor to target 3 credits. This should then gets written into the ERs, ideally in an M&E document and in a BREEAM document.
 Stage 3
Mechanical Engineer doing Stage 3 design should calculate their design still achieves 3 credits. This may be the contractor's engineer, or could still be the client side engineer, depending on how the project is being tendered.
 Stage 4
If there was a design change, as part of either:
The technical submission to the client team regarding the design change, the POL 02 credits should have been recalculated by the contractor side mechanical engineer and approved by the client side engineer,
 Stage 5
The contractor's Mechanical Sub Contractor should submit a technical submittal for the kit they propose is procured including updated POL 02 calculations. The AP and/or M&E designers should approve the technical submittal having checked the proposed kit meets POL 02 (among other) requirements.
 Questions to ask while seeking compliance
Do you have any electric heating?
Be wary under BREEAM UK New Construction as the NOx emissions for electric heating are so high, that a couple of electric heaters (over the door? small quantity of office areas in an otherwise unheated building?) can make it nearly impossible to achieve many credits.
DHW heating can be excluded from the calculation where designer can demonstrate it is less than 10% of the building's total energy consumption (e.g. via Building's Energy Performance Certificate). Point of use water heaters are excluded by default.
Does the calculation use values for sources' operation under normal conditions to meet the building’s heating demand?
The reason to ask this is because the NOx for the CHP system will have to be calculated separately, and under BREEAM 2014 UK New Construction schemes and earlier, the methodology is very favourable to CHP leading to more available credits. Note: under BREEAM 2018 UK New Construction this is not the case.
 Tips and best practice
District heating system:
For project connected to the district heating system which is not under the developer's control and mandated by a local authority (or other statutory body) maximum number of credits to be awarded. Where this is not mandatory the NOx emissions calculation to be provided. (see KBCN0979) Where a district heating system also generates electricity, this can be used to off-set NOx emissions from grid electricity, the calculation methodology for CHP systems can be used. (see KBCN0857)
 Typical evidence
Typical design stage evidence may include:
- Boiler/CHP/Heat Emitter/Cooling/Heater schedules
- Drawings showing quantity of each item of heating/hot water/cooling equipment
- Datasheets and/or manufacturer emails confirming NOx emissions for each piece of equipment
- Letter or calculation sheet (be careful that a calc sheet is robust - signed? dated?) calculating the NOx emissions for the development.
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--Sandra Turcaniova 15:11, 03 Jan 2018 (BST)
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