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24/04/2018
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DESIGN VS REALITY:LESSONS LEARNED FROM OPERATIONAL NET ZERO ENERGY BUILDINGS
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CASE STUDIES
24/04/2018
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BUILDING USEElectrical Apprenticeship
BUILDING TYPE1981 Commercial Renovation
AREA46,000 sq ft
COST$288/sq ft
Energy Use Intensity (EUI)15.3 kBTU/sf/yr
LOCATIONSan Leandro, CA
TEAM
IBEW-NECA | Owner
FCGA | Architect
Novo Construction | GC
stok | Energy Modeler, LEED Consultant, Commissioning Agent
CASE STUDY: IBEW-NECA ZERO NET ENERGY CENTER (ZNEC)
Modbus dashboard in Main Lobby
ACTIVE STRATEGIES
Lighting Controls
Building Automation System
Variable Refrigerant Flow
PASSIVE STRATEGIES
Natural Light
Natural Ventilation
Thermal Mass
White/Reflective Surfaces
Natural Light & Natural Ventilation
Solar Tree Inverters
CASE STUDY: IBEW-NECA ZERO NET ENERGY CENTER (ZNEC)
24/04/2018
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12kW (3) turbines
166 kW PV arrays
Solar light tubes
rooftop monitors
ANNUAL ELECTRICITY GENERTION (ACTUAL)
263,500 KWH DC
ANNUAL ELECTRICITY USE (ACTUAL)
227,500 KWH DC
% OF ENERGY ONSITE
116%
CASE STUDY: IBEW-NECA ZERO NET ENERGY CENTER (ZNEC)
daylighting, natural ventilationnatural ventilation (stack effect)
thermal mass wall
natural ventilation (stack effect)
CASE STUDY: IBEW-NECA ZERO NET ENERGY CENTER (ZNEC)
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IBEW-NECA ZNEC CHALLENGES
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• Design & Construction
• Financing
• Early project team onboarding
• Integrated systems contractor in Design Phase
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• Design & Construction
• Financing
• Early project team onboarding
• Integrated systems contractor in Design Phase
• Operations
• Lighting control system
IBEW-NECA ZNEC CHALLENGES
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IBEW-NECA ZNEC LESSONS LEARNED
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• Firm up financing sooner
• Engage integrated systems contractorearly
• Define configurations for optimalperformance
• Use same manufacturer for all lightingcontrol components
• Install additional solar tubes
• Explore other heating options
BUILDING USEScience Museum
BUILDING TYPE1914 Renovation
AREA190,000 sq ft
COST$700/sq ft
Energy Use Intensity (EUI)44.8 kBTU/sf/yr
LOCATIONSan Francisco, CA
TEAM
The Exploratorium | Owner
EHDD | Architect
Nibbi Brothers | GC
stok | LEED Consultant
CASE STUDY: THE EXPLORATORIUM
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Fritted glass
ACTIVE STRATEGIES
Radiant Heating & Cooling
Dedicated Outside Air System (DOAS)
Lighting Controls
Renewables
PASSIVE STRATEGIES
Natural Light
Natural Ventilation
Natural light & natural ventilation
CASE STUDY: THE EXPLORATORIUM
Dedicated Outside Air System (DOAS)
1.4 MW PV arrays
ANNUAL ELECTRICITY GENERTION (ACTUAL)
36.7 kBTu/ sq ft
ENERGY SAVINGS (ASHRAE 90.1-2007)
40% (93% with PV)
CASE STUDY: THE EXPLORATORIUM
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Bay water system
Radiant heating & cooling
CASE STUDY: THE EXPLORATORIUM
Bay water system
THE EXPLORATORIUM CHALLENGES
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• Design & Construction
• Projected solar performance
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• Design & Construction
• Projected solar performance
• Operations
• Operating assumptions – more open hours, more staff, more attendance
• Lighting controls
• Actual solar performance
• Staff engagement / education
THE EXPLORATORIUM CHALLENGES
THE EXPLORATORIUM LESSONS LEARNED
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• Fully commission all systems
• Integrated / compatible BuildingManagement Systems & PowerManagement Systems
• Properly calibrated meters
• Plan for storage & utilization of excesspower production
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