ZERO CARBON HUB

Rob PannellHead of Housebuilding

PURPOSE AND STRATEGIC OBJECTIVES

Facilitate the mainstream delivery of low and zero carbon homes

Provide leadership and create confidence

Reduce risk and clear obstacles

Disseminate information

ROLE OF THE ZERO CARBON HUB

OUR CURRENT POSITION

New Domestic

New Non -Domestic

Existing Domestic

Existing Non -

Domestic

Building Energy

Consumer Skills

Examples

FIVE WORKSTREAMS

PROCESS

EXAMPLES

JOURNEY TO ZERO CARBON HOMES

3 4

6

JOURNEY TO ZERO CARBON HOMES

70%4.5

12

Energy Efficiency

The latest developments

Defining the Fabric Energy Efficiency Standard for zero carbon homes

13

Scene Setting - Policy

14

Zero Carbon Hierarchy

Energy Efficiency

On-site LZC tech. or connected heat

Allowable Solutions

70%

Car

bo

n

Co

mp

lian

ce

TG

S

cop

e

Zer

o C

arb

on

Scope of ‘Energy Efficiency’

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Building fabric U-values

Thermal bridging

Air permeability

Thermal mass

Solar, metabolic, lighting & appliance gains

Heating / cooling appliances (boilers, etc)

Mechanical ventilation

Hot water

Active controls

Fixed lighting

All LZC technologies

Energy Efficiency Standard

Carbon Compliance Standardheat

power

LZC tech

nology

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RECOMMENDATION:Metric for Energy Efficiency

kWh/m²/yr space heating & space cooling demand

Performance standard With design guidance

Design Flexibility

Takes into account building form

Promotes innovation

Known level of performance

Known ‘currency’ internationally

Specifications Modelled

BaselineSpec A

(NV)Spec B (MVHR)

Spec B (NV)

Spec C- (MVHR)

Spec C- (NV)

Spec C (MVHR)

Spec C (NV)

Spec D (MVHR)

External Walls

0.28 0.25 0.18 0.18 0.15 0.15 0.15 0.15 0.15 – 0.09

Party Walls 0.5 0 0 0 0 0 0 0 0

Floor 0.2 0.2 0.18 0.18 0.15 0.15 0.15 0.15 0.15 – 0.08

Roof 0.16 0.15 0.13 0.13 0.11 0.11 0.11 0.11 0.10 – 0.06

Windows1.8

(double)1.5

(double)1.4

(double)1.4

(double)1.2

(double)1.2

(double)0.8

(triple)0.8

(triple)1.0 – 0.6 (triple)

Doors 1.6 1.4 1.2 1.2 1 1 1 1 0.8

Air leakage (m³/hr/m²)

7 5 3 3 3 3 1 3 1.26 – 0.41

Thermal bridging (W/m²K)

0.08 0.06 0.05 0.05 0.04 0.04 0.04 0.04 0.04

VentilationNatural(extract

fans)

Natural (extract

fans)MVHR

Natural (extract

fans)MVHR

Natural (extract

fans)MVHR

Natural (extract

fans)MVHR

Current practice

PassivHaus equivalent

Modified AECB Silver

Standard

U-v

alu

es (

W/m

²K)

Spec C but double glazed & air leakage = 3

EST APEE Standard

EST BPEE Standard =

between Spec A & Spec B

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0

10

20

30

40

50

60

70

80

90

100

Fabr

ic E

nerg

y Effi

cien

cy S

tand

ard

(kW

h/m

²/yr

) Current practice (CP)

CP + No heat lossthrough party wallSpec A

Spec B

Spec C-

Spec C

Spec D (PassivHaus)

Series9

Apartment Blocks Mid Terrace Houses

Detached Houses

End Terrace & Semi-detached

Houses

Task Group Recommendation of Level

Will have to work

harderSimilar build specs

RECOMMENDATION: LevelSpace Heating & Space Cooling Demand, kWh/m²/yr

What this meansEnergy demand reduction

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0

50

100

150

200

250

300

350

1900 1995 2002 Currentpractice

2016Recomm-endation

Ener

gy D

eman

d (k

Wh/

m²/

yr)

Space heating

Hot water

Regulated electricity

Unregulated electricity

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What this meansRelationship with 70% Carbon Compliance

0%

10%

20%

30%

40%

50%

60%

70%

Small apartment Semi-detachedhouse

Detached house

% C

O2 R

educ

tion*

Additional CO2reduction requiredfrom on-site LZCtechnologies orconnected heat toachieve 70% CarbonCompliance

CO2 reduction fromFabric EnergyEfficiency Standard(+ gas boiler)

* Calculated as per the Zero Carbon consultation document assumptions

CO2 reduction from Fabric Energy Efficiency Standard (+ gas boiler)

Additional CO2

reduction required from on-site LZC technologies or connected heat to achieve 70% Carbon Compliance

Carbon Compliance

Decision Criteria:Task Group Assessment

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Capital CostEnergy Efficiency Measures

-£30,000

-£20,000

-£10,000

£0

£10,000

£20,000

£30,000

Baseline Spec A (NV) Spec B (NV) Spec C- (NV) Spec C (NV)

Net

pre

sent

cos

t

Fabric Capex

Fabric Capex

Whole Life Cost: Carbon ComplianceSemi-detached House

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Basis:

• 70% carbon compliance

• Over 60 years

Assumptions:• Net present ‘extra

over’ costs• Energy inflation =

RPI + 2.5%, • Discount rate = 5%• Full costs exclusive

of land take

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Whole Life Cost: Carbon ComplianceSemi-detached House

-£30,000

-£20,000

-£10,000

£0

£10,000

£20,000

£30,000

Baseline Spec A (NV) Spec B (NV) Spec C- (NV) Spec C (NV)

Net

pre

sent

cos

t

PV Capex

SHW Capex

Fabric Capex

Fabric Capex

CC (70%) Capex

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-£30,000

-£20,000

-£10,000

£0

£10,000

£20,000

£30,000

Baseline Spec A (NV) Spec B (NV) Spec C- (NV) Spec C (NV)

Net

pre

sent

cos

t

Replacement &Maintenance

PV Capex

SHW Capex

Fabric Capex

CC (70%) Capex

Whole Life Cost: Carbon ComplianceSemi-detached House

26

-£30,000

-£20,000

-£10,000

£0

£10,000

£20,000

£30,000

Baseline Spec A (NV) Spec B (NV) Spec C- (NV) Spec C (NV)

Net

pre

sent

cos

t

Replacement &Maintenance

PV Capex

SHW Capex

Fabric Capex

Operationalsavings

CC (70%) Capex

Whole Life Cost: Carbon ComplianceSemi-detached House

27

-£30,000

-£20,000

-£10,000

£0

£10,000

£20,000

£30,000

Baseline Spec A (NV) Spec B (NV) Spec C- (NV) Spec C (NV)

Net

pre

sent

cos

t

Replacement &Maintenance

PV Capex

SHW Capex

Fabric Capex

Operationalsavings

CC (70%) Capex

Total net cost

Whole Life Cost: Carbon ComplianceSemi-detached House

28

Supplementary Work Required

Zero Carbon Hub Government Research

Integration into CfSH consultation CfSH

Health / Air permeability / Ventilation Task Group Part F Required

Certification, Verification & Audit Task Group Part L Required

Actual dwelling performance Facilitation TSB / other Required

Land take costs Task group

Design GuidanceTask Group /

industry

SAP 2009 modelling tool development / rebasing

CC Assumptions Task Group

SAP / Part L

Additional dwelling modelling Required

Overheating Required

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Recommendations Summary

Metric

kWh/m²/yr

Space heating + Space cooling demand

Level

Implementation

2016 with interim step in 2013 Strong section in CfSH consultation Strongly worded ministerial statement

Timeline implications

Blocks of flats and mid terrace houses: 39 kWh/m²/yr

Semi-detached, end terrace and detached houses: 46 kWh/m²/yr

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Allowable Solutions

The latest developments

3131

July 2009 Ministerial Statement

Allowable solutions that received broad support:

Further carbon reductions on site...

Energy efficient appliances...

Advanced forms of building control system...

Exports of low carbon or renewable heat...

Investments in LZC community heat infrastructure.

Others remain under consideration:

Retrofit

Offsite renewable electricity

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Thankyou for Listening