NZEB OFFICE BUILDING INCLUDING RENEWABLE ENERGY RATIO CALCULATION

PAGE 1

WHAT IS EPC/ CPC/ RER

It is an ASSET assessment not an operational assessment

EPC – Energy Performance Coefficient MPEPC 1.0

Primary Energy Consumption of Proposed Building

Primary Energy of Reference Building based on Interim Spec

CPC – Carbon Performance Coefficient MPCPC 1.15

Carbon Emissions of Proposed Building

Carbon Emissions of Reference Building based on Interim Spec

Renewable Energy Ratio: RER > 20%

Renewable Primary Energy

Total Primary Energy including Renewable

01 Insert divider title 3

A Insert divider title 7

CONTENTS

CREATING THE

REFERENCE BUILDING

PAGE 3

GUIDANCE

PAGE 4

PROJECT DATABASE

PAGE 5

GEOMETRY

PAGE 6

GEOMETRY

PAGE 7

HVAC – CENTRAL HEATING WITH RADIATORS

PAGE 8

HVAC – AIR CONDITIONING

PAGE 9

HVAC – AIR CONDITIONING

PAGE 10

HVAC – AIR CONDITIONING

PAGE 11

LIGHTING

PAGE 12

LIGHTING

PAGE 13

LIGHTING CONTROLS

01 Insert divider title 3

A Insert divider title 7

CONTENTS

LESSON LANE

PAGE 15

PROJECTS

Lesson Lane

• 6500m2 7 storey plus basement Office Block in City Centre

• Naturally Ventilated Offices - fresh air mechanically supplied with Heat

Recovery

• FCU in Meeting Rooms

• Split System in Comms Rooms

PAGE 16

LESSON LANE – INTERIM SPECIFICATION

Element Interim

Specification

Fabric

Backstop

Lesson Lane

Fabric

Roof U Value (W/(m2K)) 0.15 0.21 0.1

Wall U Value (W/(m2K)) 0.18 0.21

0.35 for insulated spandrel panel

0.1 for all other heat loss walls

Floor U Value (W/(m2K)) 0.15 0.21 0.1 for all heat loss floor

Thermal Bridging ACD ACD ACD Window U Value (W/(m2K)) 1.4 1.4 0.8

% glass of Exposed Façade 40% 60% 60%

G-Value (%) 0.4 0.35 0.35

Light Transmittance (%) 0.71 0.55 0.55 Air Permeability (m3/(m2h) 3 3 1

PAGE 17

LESSON LANE – INTERIM SPECIFICATION

Element Interim

Specification

Fabric

Backstop

Lesson Lane

Lighting

Lighting 65 Lumen/circuit watt

with MF 0.8 LED

(1.6 w/m2/100 lux) LED

(1.6 w/m2/100 lux)

Daylight Control Switching Dimming Dimming

Occupancy Control Auto On/ Dim Auto On/ Off Auto On/ Off

HVAC

Heating 91% 92% 92% Variable speed control of fans and pumps Yes Yes Yes

M&T - M&T on HVAC and

Lighting M&T on HVAC and

Lighting

Cooling (air-conditioned) (SEER/SSEER)

4.5 SEER/ 3.6 SSEER 2.7 SSEER mixed mode

3.5 SEER/ 2.39 SSEER Mixed Mode cooling FCU

- Meeting rooms 3.5 SEER/ 2.62 SSEER

Cooling Split System in Comms Rm

3.5 SEER/ 2.39 SSEER Mixed Mode cooling FCU -

Meeting rooms 3.5 SEER/ 2.62 SSEER

Cooling Split System in Comms Rm

PAGE 18

LESSON LANE – INTERIM SPECIFICATION

Element Interim

Specification

Fabric

Backstop

Lesson Lane

Ventilation Demand Controlled

S&E Fresh Air only to Offices and Meeting rooms

with heat recovery S&E to WCs and photocopy

with heat recovery Extract from tea station

S&E Fresh Air only to Offices and Meeting rooms with

heat recovery S&E to WCs and photocopy

with heat recovery Extract from tea station

Central Ventilation SFP (W/(l/s)) 1.8 1.5 1.5

Heat Recovery - 80% 80%

DHW

Hot Water Heater 91% 92% Natural Gas 92% Natural Gas

DHW Tank 2000 litres 2000 litres 2000 litres

Insulation on Tank 75mm 75mm 75mm Secondary Circulation Losses (W/m) 7 7 7

PAGE 19

PRIMARY ENERGY

Heating, 38.1, 29%

Cooling, 3.5, 3%

Auxiliary, 15.4,

12%

Lighting, 50.9,

39%

Hot Water, 22.5, 17%

INTERIM SPEC

Heating, 29.3,

31%

Cooling, 5.1,

5% Auxilia

ry, 13.8, 15%

Lighting, 28.8,

31%

Hot Water, 17.1, 18%

FABRIC BACKSTOP

Heating, 10.8, 14%

Cooling, 5.6, 7%

Auxiliary, 13.8,

18%

Lighting, 28.7,

38%

Hot Water, 17.1, 23%

CURRENT DESIGN

PAGE 20

INTERIM NZEB SPECIFICATION TOOL

PAGE 21

INTERIM NZEB SPECIFICATION TOOL

PAGE 22

INTERIM NZEB SPECIFICATION TOOL

PAGE 23

PHOTOVOLTAIC

PAGE 24

PHOTOVOLTAIC

Interim

Specification

Fabric Backstop Lesson Lane

Photovoltaic 623m2 500m2 385m2

kW 94 75 57.7

Photovoltaic Issues

• Roof Space Requirement

Roof Area approx 784m2

Allowing for overshading – 392m2

• Is peak load exceeding base load

within building

• Would you need to export electricity,

associated costs

PAGE 25

SOLAR PANELS

PAGE 26

SOLAR PANELS

Interim

Specification

Fabric Backstop Lesson Lane

Solar Panels 500m2 500m2 500m2

Solar Panel Issues

• Limited by requirement for hot

water

• Limited by roof space

• Additional storage volume

required

PAGE 27

BIOMASS

PAGE 28

BIOMASS

Interim

Specification

Fabric Backstop Lesson Lane

% of Htg & DHW 55% 42% 55%

Estimated kW 448kW 351kW 233kW

kWh 191,802 112,306 88,360

Biomass Issues

• Constant Thermal Base Load

• Adequate Space for Storage

• Access for delivery of fuel

PAGE 29

CHP

PAGE 30

CHP

Interim

Specification

Fabric Backstop Lesson Lane

% of Htg & DHW 100% 100% 100%

CHP Issues

• Is there a constant thermal load

and electrical load, 100% of

thermal load is not feasible

• Location of plant

PAGE 31

BIOGAS CHP

Interim

Specification

Fabric Backstop Lesson Lane

% of Htg & DHW 50% 20% 25%

CHP Issues

• Is there a constant thermal load

and electrical load, 15/20% of

thermal load is feasible

• Thermal Efficiency is reduced

• Location of plant

• Security of fuel supply?

PAGE 32

HEAT PUMP

PAGE 33

HEAT PUMP

Interim

Specification

Fabric Backstop Lesson Lane

% of Htg 100% 100% 100%

% of DHW 0% 0% 0%

Heat Pump Issues

• Is it feasible to use low

temperature installation – Use of

FCU/ AHU?

• Space requirements for plant

• GSHP v ASHP

PAGE 34

HEAT PUMP 2

Interim

Specification

Fabric Backstop Lesson Lane

% of Htg - - 100%

% of DHW - - 100%

Heat Pump Issues

• Is it feasible to use low

temperature installation – Use of

FCU/ AHU

• Space requirements for plant

• GSHP v ASHP

• Based on COP 250 for DHW

• Hot Water temperature

requirement for DHW to avoid

Legionella

PAGE 35

HEAT PUMP & PV

Interim

Specification

Fabric Backstop Lesson Lane

% of Htg - - 100%

% of DHW - - 0%

Photovoltaic - - 200m2

Heat Pump Issues

• Is it feasible to use low

temperature installation – Use of

FCU/ AHU

• Space requirements for plant

• GSHP v ASHP

• Space requirement for PV

PAGE 36

LESSON LANE – RER SUMMARY

Interim

Specification

Fabric

Backstop

Lesson Lane

Photovoltaic

Solar Panel

Biomass

CHP

Biogas CHP

Heat Pump Htg Only

Heat Pump Htg & DHW - -

Heat Pump Htg & PV - -

01 Insert divider title 3

A Insert divider title 7

CONTENTS

LESSON LANE – AIR

CONDITIONED OFFICE

PAGE 38

LESSON LANE – TYPE OF SYSTEM?

NATURALLY

VENTILATED

FAN COIL UNIT ACTIVE CHILLED

BEAM

Photovoltaic 385m2 800m2 550m2

EPC 0.58 0.85 0.62

CPC 0.59 0.88 0.64

RER 0.2 0.21 0.21

PAGE 39

ACHIEVING RENEWABLE WITHIN AC OFFICE?

ACTIVE CHILLED

BEAM

ACTIVE

CHILLED BEAM

SPLIT

Renewable 550m2

Photovoltaic

350m2 Photovoltaic

with

Heat Pump

providing Heating

350m2 Photovoltaic

with

Heat Pump providing

Heating

EPC 0.62 0.64 0.61

CPC 0.64 0.66 0.63

RER 0.21 0.21 0.21