NZEB Office Building by David Walshe

Public Sector Near Zero Energy Building (NZEB) Case Study – Office Building NZEB and RER

ENGINEERING DESIGN PARTNERSHIP

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Presentation by David WalsheTechnical Director

IN2 Engineering Design Partnership


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Overview IN2 Engineering Design Partnership

01. Building Introduction02. Previous Energy Improvements03. NZEB 2017 Analysis04. RER Applications


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• ABK Architects

• 35,000m2

• 8 / 6 storeys over Grd Flr

• Open Plan Office

• Spec Development – A/C

• Planning Summer 2016

• Tender Summer 2017

1.0 Building Introduction IN2 Engineering Design Partnership


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• TAS Dynamic Simulation Model

• NZEB Reference Building (40% Glaz)

• NZEB Actual Building (typically 60% Glaz + Shading)

• Fabric, Leakage, Services, Lighting as NZEB spec

• Air Conditioned (FCU)

1.0 Building Introduction IN2 Engineering Design Partnership


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Summary

• Daylighting - Photocell Control / Lighting – Best Saving!!

• Natural Ventilation Penalised Under NZEB?

• PV / Glazing Small Savings

• Insulation / Infiltration Negligible Impact

• But!.... NZEB Rating requires combination of technologies

2.0 Previous Energy Improvements

Insulation

Infiltration

Glazing

Natural Ventilation

Lighting

Lighting Control

Base

PV

50%40%30%20%10%0% 60%

Insulation Infiltration Glazing Nat Vent Lighting Ltg Controls PVImprovement 6% 5% 12% 15% 36% 53% 12%


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Reference NZEB v Reference 2008

• 60% Reduction (approx) below 2008

• Reductions across each category

3.0 NZEB 2017 Analysis IN2 Engineering Design Partnership

Energy Type HTG HWS CLG AUX LTG Renewables GAS ELEC TotalReference 2008 10.7 9.2 16.8 22.6 51.6 0 21.9 199.4 221.3

Reference NZEB 4.6 4.3 5.6 10.2 21.1 0 9.8 80.9 90.7

% Reduction: 59% EPC 0.41

HTG HWS

GAS ELEC

CLG AUX LTG

Primary Energy (kWh/m2)

Building Energy (kWh/m2)50250

200150100500 250

10075 125

Reference 2008

Reference NZEB

Reference 2008

Reference NZEB


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Actual v Reference 2008

• 65% Reduction (approx) below Part L 2008


Energy Type HTG HWS CLG AUX LTG Renewables GAS ELEC TotalReference 2008 9.4 9.2 17.4 22.6 51.6 0 20.46 200.69 221.15

Actual 3.8 4.6 5.1 9.5 16.2 0 9.26 67.60 76.86


HTG HWS

GAS ELEC

CLG AUX LTG



200150100500 250

10075 125

Reference 2008

Actual

Reference 2008

Actual


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Actual v Reference NZEB

15% Reduction (approx) below Part L 2008

• Lighting Increased Glazing Daylighting ADF 2.7% v 2.2%

• Heating Heat Recovery

• Cooling and Auxiliary Small Plant Improvements


Energy Type HTG HWS CLG AUX LTG Renewables GAS ELEC TotalReference NZEB 4.6 4.3 5.6 10.2 21.1 0 9.77 80.94 90.71

Actual 3.8 4.6 5.1 9.5 16.2 0 9.26 67.60 76.86


HTG HWS

GAS ELEC

CLG AUX LTG



200150100500 250

10075 125

Reference NZEB

Actual

Reference NZEB

Actual


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4.0 RER Applications IN2 Engineering Design Partnership

12% Only Heating and Water! (Gas)

GASELEC

78%

12%


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20% Renewable Energy Provision

• Thermal Options – 12% Max! 0% 5% 10% 15% 20%

Solar Thermal (50% HWS)

Biomass (75% HTG/HWS)

ASHP (100% HTG/HWS)

CHP (Offset 10% ELEC)

RER Technology


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• ELEC Options – Wind

74no. 15m Helical Wind Turbines

1no. 35m / 25m diam


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• ELEC Options – PV

2,400m2 PV required

1,000m2 PV area available

Recogniseddifficulty– 20% RER being reviewed

Possiblyoffsetother Primary Energy reduction?

15% below NZEB? 5% RER?


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Coda IN2 Engineering Design Partnership

Kylemore Monastery• ABK Architects

• Nuns Accommodation

• 2,000m2 approx

• Bedrooms

• Refectory

• Kitchen

• Common Areas


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Coda IN2 Engineering Design Partnership

Kylemore Monastery• Heating and Hot Water Energy High

• Electrical Energy Low No Cooling Low Mech Vent Low Illumination requirements

• ASHP

• 50% RER!

Energy Type HTG HWS CLG AUX LTG Renewables GAS ELEC TotalReference 60.9 36.4 0.0 1.3 9.2 0 107.0 22.9 129.9

Actual 26.1 12.5 0.0 1.2 11.4 0 0.0 112.4 112.4

Improvement on Part L NZEB: 14% EPC 0.86

HTG HWS

GAS ELEC

CLG AUX LTG



100500 150

10075 125

Reference

Actual

Reference

Actual

Public Sector Near Zero Energy Building (NZEB) Case Study – Office Building NZEB and RER


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Presentation by David WalsheTechnical Director

IN2 Engineering Design Partnership

NZEB Office Building by David Walshe

Engineering

Transcript of NZEB Office Building by David Walshe