2021 PartL Compliance Changes

Steve Cocchi — Mon, 17 Jul 2023 22:45:45 GMT

Current Revision posted to OpenBuildings | AECOsim | Speedikon Wiki by Steve Cocchi on 7/17/2023 10:45:45 PM

	Product(s):	OpenBuildings Energy Simulator
	Version(s):	CONNECT Edition
	Area:	Part L

Overview

With the introduction of the 2021 PartL building regulations much more stringent building compliance requirements will be in place. This will impact many aspects of building design.

The major effects of this for energy assessors and for building compliance can best be seen by inspecting the 2021 BRUKL Compliance documents.

Details

The main changes to expect include:

Target Primary Energy Rate

Previously buildings achieved an overall pass upon considering CO2 emissions levels only, in the form of the BER (Building Emission Rate) and TER (Target Emission Rate). In addition to this, the energy of buildings is now measured via the BPER (Building Primary Energy Rate) and TPER (Target Primary Energy Rate). Both these targets must not be exceeded for a building to comply with the regulations.

Building Fabric U-value Check

Significantly lower minimum U-values for all building fabric types are to be adopted. This will require much improved building fabric materials, and more insulation.

To put this in context, for Walls the new standards will reduce the target U-value by approximately 25%.

Also note that Roofs are now subdivided into Flat Roofs and Pitched Roofs, each with their own U-value target.

Air Permeability

Buildings are to be made more air-tight with a reduction in the limiting standard for air permeability. This is changing from 10 to 8 m³/(h.m²) at 50 Pa:

DHW Minimum Efficiency

New minimum DHW efficiency standard, changing from 0.8 to 0.91:

New Minimum HVAC Efficiencies

The exact change will depend on the HVAC System Type selected, however for instance, for conventional boilers the minimum efficiency has changed from 0.91 to 0.93:

Tags: BRUKL, OpenBuildings Energy Simulator, PartL 2021

2021 PartL Compliance Changes

Shane Regan — Wed, 03 May 2023 15:26:17 GMT

Revision 4 posted to OpenBuildings | AECOsim | Speedikon Wiki by Shane Regan on 5/3/2023 3:26:17 PM

	Product(s):	OpenBuildings Energy Simulator
	Version(s):	CONNECT Edition
	Area:	Part L
	Subarea:	N/A

Overview

With the introduction of the 2021 PartL building regulations much more stringent building compliance requirements will be in place. This will impact many aspects of building design.

The major effects of this for energy assessors and for building compliance can best be seen by inspecting the 2021 BRUKL Compliance documents.

Details

The main changes to expect include:

Target Primary Energy Rate

Building Fabric U-value Check

Significantly lower minimum U-values for all building fabric types are to be adopted. This will require much improved building fabric materials, and more insulation.

To put this in context, for Walls the new standards will reduce the target U-value by approximately 25%.

Also note that Roofs are now subdivided into Flat Roofs and Pitched Roofs, each with their own U-value target.

Air Permeability

Buildings are to be made more air-tight with a reduction in the limiting standard for air permeability. This is changing from 10 to 8 m³/(h.m²) at 50 Pa:

DHW Minimum Efficiency

New minimum DHW efficiency standard, changing from 0.8 to 0.91:

New Minimum HVAC Efficiencies

The exact change will depend on the HVAC System Type selected, however for instance, for conventional boilers the minimum efficiency has changed from 0.91 to 0.93:

Tags: BRUKL, OpenBuildings Energy Simulator, PartL 2021

2021 PartL Regulation Changes - what to expect

Shane Regan — Wed, 01 Jun 2022 09:07:19 GMT

Revision 3 posted to OpenBuildings | AECOsim | Speedikon Wiki by Shane Regan on 6/1/2022 9:07:19 AM

	Product(s):	OpenBuildings Energy Simulator
	Version(s):	CONNECT Edition
	Area:	Part L
	Subarea:	N/A

Overview

With the introduction of the 2021 PartL building regulations much more stringent building compliance requirements will be in place. This will impact many aspects of building design.

The 2021 PartL calculations will run on a new version of the SBEM calculation engine, which is designed to perform as specified in the 2021 National Calculation Methodology. The underlying changes are available to view in the NCM Modelling Guide, available below:

NCM_Modelling_Guide_2021_Edition_England (uk-ncm.org.uk)

Details

The major effects of this for energy assessors and for building design can best be seen by inspecting the 2021 BRUKL Compliance documents. The main aspects are highlighted below:

Target Primary Energy Rate

Building Fabric U-value Check

Significantly lower minimum U-values for all building fabric types are to be adopted. This will require much improved building fabric materials, and more insulation.

To put this in context, for Walls the new standards will reduce the target U-value by approximately 25%.

Also note that Roofs are now subdivided into Flat Roofs and Pitched Roofs, each with their own U-value target.

Air Permeability

Buildings are to be made more air-tight with a reduction in the limiting standard for air permeability. This is changing from 10 to 8 m³/(h.m²) at 50 Pa:

DHW Minimum Efficiency

New minimum DHW efficiency standard, changing from 0.8 to 0.91:

New Minimum HVAC Efficiencies

The exact change will depend on the HVAC System Type selected, however for instance, for conventional boilers the minimum efficiency has changed from 0.91 to 0.93:

Tags: BRUKL, OpenBuildings Energy Simulator, PartL 2021

2021 PartL Compliance Changes - what to expect

Shane Regan — Fri, 06 May 2022 14:12:19 GMT

Revision 2 posted to OpenBuildings | AECOsim | Speedikon Wiki by Shane Regan on 5/6/2022 2:12:19 PM

	Product(s):	OpenBuildings Energy Simulator
	Version(s):	CONNECT Edition
	Area:	Part L
	Subarea:	N/A

Overview

With the introduction of the 2021 PartL building regulations, the more stringent compliance requirements can be seen in 2021 BRUKL Compliance documents.

Details

Some of the differences to note are:

Target Primary Energy Rate

Building Fabric U-value Check

Significantly lower minimum U-values for all building fabric types:

Air Permeability

New limiting standard, changing from 8 to 10 m³/(h.m²) at 50 Pa:

DHW Minimum Standard value

New minimum efficiency standard, changing from 0.8 to 0.91:

New Minimum HVAC Efficiencies

For instance, conventional boilers standards have changed from 0.91 to 0.93:

Tags: BRUKL, OpenBuildings Energy Simulator, PartL 2021

2021 PartL Compliance Changes - what to expect

Shane Regan — Fri, 06 May 2022 14:08:49 GMT

Revision 1 posted to OpenBuildings | AECOsim | Speedikon Wiki by Shane Regan on 5/6/2022 2:08:49 PM

	Product(s):	OpenBuildings Energy Simulator
	Version(s):	CONNECT Edition
	Area:	Part L
	Subarea:	N/A

Overview

With the introduction of the 2021 PartL building regulations, the more stringent compliance requirements can be seen in 2021 BRUKL Compliance documents.

Details

Some of the differences to note are:

Target Primary Energy Rate
Previously buildings achieved an overall pass upon considering CO2 emissions levels only, in the form of the BER (Building Emission Rate) and TER (Target Emission Rate). In addition to this, the energy of buildings is now measured via the BPER (Building Primary Energy Rate) and TPER (Target Primary Energy Rate):
Building Fabric U-value Check
Significantly lower minimum U-values for all building fabric types:
Air Permeability
New limiting standard, changing from 8 to 10 m³/(h.m²) at 50 Pa:
DHW Minimum Standard value
New minimum efficiency standard, changing from 0.8 to 0.91:
New Minimum HVAC Efficiencies
For instance, conventional boilers standards have changed from 0.91 to 0.93:

Tags: BRUKL, OpenBuildings Energy Simulator, PartL 2021