Public Sector Near Zero Energy Building (NZEB) Case Study – Office Building NZEB and RER
ENGINEERING DESIGN PARTNERSHIP
TM
Presentation by David WalsheTechnical Director
IN2 Engineering Design Partnership
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
3.0 NZEB 2017 Analysis IN2 Engineering Design Partnership
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
% Reduction: 65% EPC 0.35
HTG HWS
GAS ELEC
CLG AUX LTG
Primary Energy (kWh/m2)
Building Energy (kWh/m2)50250
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
3.0 NZEB 2017 Analysis IN2 Engineering Design Partnership
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
% Reduction: 15% EPC 0.85
HTG HWS
GAS ELEC
CLG AUX LTG
Primary Energy (kWh/m2)
Building Energy (kWh/m2)50250
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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4.0 RER Applications IN2 Engineering Design Partnership
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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4.0 RER Applications IN2 Engineering Design Partnership
20% Renewable Energy Provision
• ELEC Options – Wind
74no. 15m Helical Wind Turbines
1no. 35m / 25m diam
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4.0 RER Applications IN2 Engineering Design Partnership
20% Renewable Energy Provision
• 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
Primary Energy (kWh/m2)
Building Energy (kWh/m2)50250
100500 150
10075 125
Reference
Actual
Reference
Actual
Public Sector Near Zero Energy Building (NZEB) Case Study – Office Building NZEB and RER
ENGINEERING DESIGN PARTNERSHIP
TM
Presentation by David WalsheTechnical Director
IN2 Engineering Design Partnership