IES Faculty March 2014Part L2A 2013 Update and Priority

Schools Building Programme (PSBP)

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

Part L Timeline

20022006

-28%

2010

-25%

2013

-9%

2016

-20-30%

2019

-30-40%

Source: UKGBC Building Zero Carbon report February 2014

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

2013

Changes

Part L The Future

UKGBC Non Domestic Zero Carbon Task Group

The Performance Gap

Real vs Compliance

Real vs Compliance

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.

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.

Part L2A 2013

Part L2A 2013

Constant illuminance added (see Room Data:

NCM lighting)

Part L2A 2013 Q&A

Sarah.graham@iesve.com

Part L2A 2013

School Test Case

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

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%

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

PSBP

Priority Schools Building Programme

(PSBP)

Daylighting Criteria – DA & UDI

Adaptive Comfort

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

PSBP

• Daylight Factors OUT – CBDM IN

• Climate Based Daylighting Modelling

• Daylight Factors: simulated using overcast sky

models

• CBDM uses actual weather data –realistic outputs

PSBP

• Primary Measure of CBDM is UDI

• UDI Target: 100 – 200Lux for 80% of the

occupied time

PSBP

• Secondary Measure of CBDM is DA

• DA Target: spaces receive target Illuminance

for 50% of the occupied hours

PSBP

PSBP

PSBP Q&A

Sarah.graham@iesve.com

Demo

PSBP Images

Sarah.graham@iesve.com

PSBP Images

Sarah.graham@iesve.com

PSBP Q&A

PSBP Q&A

Sarah.graham@iesve.com