1. IES Faculty March 2014
Part L2A 2013 Update and Priority
Schools Building Programme (PSBP)

2. Overview
• 1400 Introduction
• 1415 Part 1 – Part L 2013 Changes
– School Test Case
• 1515 Q&A
• 1530 Part 2 – PSBP Overview
– Schools Test Case
• 1630 Q&A

3. Part L Timeline
2002 2006
-28%
2010
-25%
2013
-9%
2016
-20-30%
2019
-30-40%
Source: UKGBC Building Zero Carbon report February 2014

4. Part L 2013 Headlines
• Aggregate 9% improvement
• 4 classes of notional building
• Notional building air permeability is sub divided by
size; Window U value reduced from 1.8 to 1.6
• Criterion 2 – buildings with high heat gains can have
a less demanding are weighted U value
• Improvements depend on type of building including
lighting efficacy, terminal SFP’s etc

5. 2013
Changes

6. Part L The Future
UKGBC Non Domestic Zero Carbon Task Group

7. The Performance Gap

8. Real vs Compliance

9. Real vs Compliance

10. Enhanced Modelling
Radiators and chilled ceilings may now be
autosized
Using specified room temperatures and loads
(either manually entered or generated by a
System Loads analysis)
Users can elect to autosize the number of
units of a chosen type and the required water
flow.

11. Part L2A 2013
Navigators detail all the steps that
should be considered in a Compliance
Assessment.
•Once data is entered users check the
associated entry recording who
completed the action and when.
•Users can record their own notes via
the Navigator either for future reference
or for others working on the same
Project.

12. Part L2A 2013

13. Part L2A 2013

15. Constant illuminance added (see Room Data:
NCM lighting)

16. Part L2A 2013 Q&A
Sarah.graham@iesve.com

17. Part L2A 2013
School Test Case

18. School – Naturally Ventilated
Part L2A 2013 Test Case
Building Attribute Differences 2010 Notional Building 2013 Notional Building
Glazing U-Value 1.8 W/m2.K 1.6 W/m2.K
Air Permeability 5 3
Lighting Efficacy 55 lm/W 60 lm/W
Lighting - Occupancy Sensing Controls None Yes
Demand Control Ventilation None None*
*DCV is only applicable in Mechanically Ventilated Buildings

19. School
Part L2A 2013 Test Case
Result 2010 Notional
Building
2013 Notional
Building
Reduction
TER (kg.CO2/m2) 19.0 19.67 -4%
Heating Energy
(kg.CO2/m2)
1.98 1.74 12%
Cooling Energy
(kg.CO2/m2)
1.23 1.3 -6%
Auxiliary Energy
(kg.CO2/m2)
8.35 8.40 -1%
Lighting Energy
(kg.CO2/m2)
5.97 6.82 -14%
DHW Energy
(kg.CO2/m2)
1.46 1.41 3%

20. School
Part L2A 2013 Test Case
0
2
4
6
8
10
12
14
16
18
20
Heating DHW Cooling Auxiliary
Energy
Lighting Total
2010 Notional
2013 Notional

21. PSBP
Priority Schools Building Programme
(PSBP)
Daylighting Criteria – DA & UDI
Adaptive Comfort

22. PSBP
• Announced mid 2013
• The Priority School Building Programme
(PSBP) is the government’s largest School
building programme.
• The PSBP covers 261 schools which will be
wholly or substantially rebuilt.
• The PSBP covers Secondary, Primary and SEN
Schools in England

23. PSBP
• Daylight Factors OUT – CBDM IN
• Climate Based Daylighting Modelling
• Daylight Factors: simulated using overcast sky
models
• CBDM uses actual weather data –realistic outputs

24. PSBP
• Primary Measure of CBDM is UDI
• UDI Target: 100 – 200Lux for 80% of the
occupied time

25. PSBP
• Secondary Measure of CBDM is DA
• DA Target: spaces receive target Illuminance
for 50% of the occupied hours

26. PSBP

27. PSBP

28. PSBP Q&A
Sarah.graham@iesve.com
Demo

29. PSBP Images
Sarah.graham@iesve.com

30. PSBP Images
Sarah.graham@iesve.com

31. PSBP Q&A

32. PSBP Q&A
Sarah.graham@iesve.com