deep energy retrofit– case studies
• Deep Energy Retrofit of 192 units, while occupied by residents
• 7 story, 500 affordable apartment units, built in the 1960’s, Boston MA.
• 73% reduction in whole building consumption.
DHW: Solar Hot Water
Ventilation: Renovation of existing system utilizing Aeroseal technology and Constant Air Regulator (CAR) Dampers. Installation of fresh air trickle vents.
http://www.castledeepenergy.com
Heating: 94.5% efficient condensing boilers and indirect hot water storage tanks with hydronic baseboards in each unit.
Cooling: Energy Star AC units, 7800 Btu/hour cooling capacity, 9.9 EER
The Castle Square Apartments
Case studies / Cost benefit:
• 64,583 sf office• cost 20% less
than construction average
• 80% energy savings
Energon Offices, Ulm, 2003Architect; Stephan Oehler
Case studies / Cost benefit:
• Not planned as PH, therefore not designed or oriented for solar gain
• Still only 5% more than construction average
Montessori school: Architects: Walbrunn / Grotz / Vallentin.
No additional cost• mechanical systems cost
approximately €150,000 less• Savings were invested in
Passivhaus Standard windows and additional insulation
Case studies / Cost benefit:
building to minimum standards v. optimal standards
what would be optimal standards?
what would be optimal standards?
and what are the actual costs?
what you really want to know
graphic of cost differences
challengeswe have not cracked the utility allowance nut yettrades crews are still coming alongwe still have to prove we are meeting lower energy standards
individual meteringdirect hood exhaustinferior models don’t recognize solar gain, heat recovery, etc
case study: Delta Commons at Benning Road
case study: an Owners perspective
case study: an Owners perspective
case study: an Owners perspective
integrated design
approach
case study: We are like mechanics…
1963 Ford Falcon : 32.5 MPG @ $.40 /gallon =
case study: The efficiency of these buildings needs to sustain the welfare of its residents…
2014 Honda Fit EV: 118e MPG @ $3.38/gallon=
case study (retrofit):Delta Commons @ Benning Road
case study (retrofit):Delta Commons @ Benning Road
case study: Delta Commons @ Benning Road
Passive House principles revisited
• super-insulate/air seal (envelope), and utilize ERV
• orientation
• optimize window performance• utilize passive space conditioning• utilize high efficiency active strategies
case study (retrofit): #1 design order of operations:
orientation
case study (retrofit): #1 design order of operations:
orientation
we can not turn the buildings, => regulate solar gain (as best practically) with shading assemblies
ly
case study (retrofit):response to solar gain: shading
assemblies
JANUARY 29, 10a
JULY 21, 10a
APRIL 21, 10a
OCTOBER 21, 10a
case study (retrofit): #2 design order of operations:
envelope
case study (retrofit): #2 design order of operations:
envelope
case study (retrofit): #2 design order of operations: utilize energy recovery (ERV)
case study (retrofit): #2 design order of operations: utilize energy recovery (ERV)
a better way