what needs to be commissioned in zero energy buildings 1 what needs to be commissioned in zero...
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WHAT NEEDS TO BE COMMISSIONED IN ZERO ENERGY BUILDINGS 1
What needs to be Commissioned in Zero Energy Buildings?
Jorge Torres Coto
WHAT NEEDS TO BE COMMISSIONED IN ZERO ENERGY BUILDINGS 2
What is a Zero Energy Building?
• A building that creates as much energy as it uses in a year:– At the site– At the source
WHAT NEEDS TO BE COMMISSIONED IN ZERO ENERGY BUILDINGS 3
What can we find in ZEB?
• Ancestral design methods• Integrated design process• Passive systems
– Slow reaction time– Flat interior loads (int. offices, libraries, etc.)
• Active systems (usual suspects)– Fast reaction time– Varying interior loads (meeting rooms, etc.)
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Ancestral design methods
• Learn from the way we designed before “technology” or remind designers
• Let the building itself do the work.
• Nature can help with the building needs.
• Building simulation can assist the design team.
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Integrated design process
• The whole building as an engineered system.
• System interactions are more important than individual systems.– How will they work
together?– When will they work
together?– Will they fight each
other?
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Passive Systems
• Slow reaction time• Flat daily range• Constant interior loads• As CxP we need to understand and evaluate
the building (the system) throughout the whole Cx process.– Pre-design, design, construction, occupancy &
operations
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Passive Systems
• Solar heating– Thermal mass– Trombe walls
• Passive cooling– Thermal mass– Natural ventilation
• Daylighting• Etc.
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Passive Systems & Tools
• Start at the Envelope– NIBS Guideline 3
• Evaluate:– Energy models– CFD– Solar Exposures– Sun path diagrams– Wind roses– Siting, etc.
WHAT NEEDS TO BE COMMISSIONED IN ZERO ENERGY BUILDINGS 9
Passive Systems & Tools
• Solar heating systems– Orientation– Siting– Obstacles (shading,
buildings, topography, landscape, etc.)
– Building materials (mass, glazing, etc)
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Passive Systems & Tools
• Solar heating tools– Sun paths– CFD– Thermal imagery– Training
WHAT NEEDS TO BE COMMISSIONED IN ZERO ENERGY BUILDINGS 11
Passive Systems & Tools
• Passive cooling– Stop the heat at the
source (int. or ext.)– Orientation– Siting– Obstacles (shading,
buildings, topography, landscape, etc.)
– Building materials (mass, glazing, etc)
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Passive Systems & Tools
• Natural ventilation– Opening sizing– Opening orientation– Opening type– Interior obstacles
WHAT NEEDS TO BE COMMISSIONED IN ZERO ENERGY BUILDINGS 13
Passive Systems & Tools
• Passive cooling tools– Sun paths– Wind rose– CFD– Training (adaptive
lifestyles)
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Passive Systems & Tools
• Insulation & glazing– Proper selection for
climate and design strategies.
– Proper construction details.
– Construction matches drawings, specs, energy calculations, etc.
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Passive Systems & Tools
• Thermal mass– Proper selection of
materials (response time)
– Proper construction details (avoid thermal bridging)
– Adequate location of mass.
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Passive Systems & Tools
• Insulation, glazing, & thermal mass tools– NIBS Guideline 3– Thermal Imaging
WHAT NEEDS TO BE COMMISSIONED IN ZERO ENERGY BUILDINGS 17
Passive Systems & Tools
• Daylighting– Glazing selection– Glazing orientation– Glazing size and
location– Light shelves– Siting– Interior color scheme
WHAT NEEDS TO BE COMMISSIONED IN ZERO ENERGY BUILDINGS 18
Passive Systems & Tools
• Daylighting tools– Sun paths– Software simulation
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Cx Process for ZEB in brief
• Energy should be controlled at the source:– Lighting– Exterior environmental extremes– Massing of people (proper zoning)– The basis for this is in the OPR– Design team should do building program, basis of
design to meet or exceed OPR– The CxP should assist the design team (we are
considered the experts), through design phase commissioning.
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Key Cx tasks to insure a ZEB
• Envelope• Siting• Orientation• Landscape• Controls and interactions between passive
and active systems• Training
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Add to the CxP’s Toolbelt
• Computer simulation– CFD– Energy Models– Etc.
• Sun paths• Thermal Imaging
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Good references• http://www.wbdg.org/ccb/NIBS/nibs_gl3.pdf
• http://www.wbdg.org/ccb/DOD/UFC/ufc_3_440_06n.pdf
• http://btech.lbl.gov/pub/designguide/dlg.pdf
• http://repositories.cdlib.org/cgi/viewcontent.cgi?article=1091&context=cedr/cbe
• http://www.wbdg.org/ccb/AF/AFH/pshbk_v1.pdf
• http://www.wbdg.org/ccb/DOD/UFC/ufc_3_440_03n.pdf
• http://www.nibs.org/JBED/
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Thank You