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