Deep Retrofit: One Step Phased approach

One Step to Deep Retrofits Jan Steiger / Passive House Institute
One Step to Deep Retrofit
One Step to Deep Retrofit

Architects: Planungsbüro Gruppe 7 GmbH & Co. KG
One Shot Retrofits: Office Building Becker, Rimbach

Bolzano – Landhaus XI / Expost Building
Client: Autonome Provinz Bozen
Architects: Michael tribus Architecture

Christuskirche Heinsberg
Client: Ev. Kirchen-gemeinde Heinsberg
Architects: Rongen Architekten GmbH

University of Innsbruck – Faculty of Engineering Sciences

USA
Listed Building in Brooklyn, New York

Phased retrofits: If you do it, do it right!
181
170
150
72 72
181
146
117
25 25
0
20
40
60
80
100
120
140
160
180
200
until 2016 -
Existing Building
2016 -
Windows + ventilation
2028 -
Basement ceiling + roof +
PV
2040 -
External walls + Entrance
door
next 50-100 years -
replacements of heating
system
SpecificHeatingdemand[kWh/m²a]
SHALLOW RETROFITS DEEP RETROFITS
Locked in
EnerPHit
NOW: start properly to…
…achieve high
efficiency in 2050

Phased Retrofits: SHF Stella Maris, Wicklow Town, Ireland
Architects: MosArt Ltd

Phased Retrofits: Big multi-family buildings
Stjärnhus Stacken, Gothenburg
Treviana Social Housing, Madrid
Wilmcote Multifamily House,
Portsmouth

Phased Retrofits: Pre-certified multi-family buildings
Multi-family building, Vienna
Multi-family building, Innsbruck
Multi-family building, Taiwan

0
50
100
150
200
250
300
350
400
450
0 10 20 30 40 50 60 70 80 90
Jahr nach erster Modernisierung
Endenergiebedarf[kWh/(m²a)]
Hilfsenergie
TWW
Heizung
EnEV140%
Heating&
Basement
ceiling
Wall
Insulation
Windows,roof,
ventilationwithHR
Step-by-step retrofits: Step-by-step savingsFinalEnergyDemand
Year after 1st retrofit step
Auxiliary
DHW
Heating
EnEV 140%
PH retrofit
50%

0
2000
4000
6000
8000
10000
12000
14000
16000
0 10 20 30 40 50 60 70 80 90 100 110
Jahr nach erster Modernisierung
Endenergieaufsummiert[kWh/(m²a)]
schrittweise Sanierung
EnEV 140%
Komplett mit PH-Komponenten
Comparison of savings
PH retrofit step-by-step
EnEV 2007
PH retrofit one shot
Year after 1st retrofit step
Accum.FinalEnergyDemand

• The investment is lower. The execution of single measures is
easier when the budget is limited (the higher quality might better
be achieved)
• The measures can be limited to single (potentially empty) flats /
units or parts / sections of buildings.
• Rented objects do not need to be emptied.
• Components can be used until the end of their life cycles.
• „Motivated“ measures, which don´t depend on life cycles, can
easier be implemented
Reasons for step-by-step retrofits

• Synergy effects: Only one scaffolding is needed, construction site
facilities or approvals only need to be set up once.
• No solutions for intermediate situations need to be found and
implemented.
• Business in public or commercial buildings will only be
interrupted once.
•Cost savings by energy efficiency measures are immediately
available
•Execution costs aren´t dependent on future price developments
Reasons for one-shot retrofits

1978 1983 1988 1993 1998 2003 2008 2013 2018 2023 2028 2033 2038 2043
Fassade
Fenster
1978 1983 1988 1993 1998 2003 2008 2013 2018 2023 2028 2033 2038 2043
mittlere Lebensdauer
Separate measures: Economic considerations
Combination of
insulation and
window replacement
Remaining time of use of
windows

1978 1983 1988 1993 1998 2003 2008 2013 2018 2023 2028 2033 2038 2043
Fassade
Fenster
1978 1983 1988 1993 1998 2003 2008 2013 2018 2023 2028 2033 2038 2043
Combination of
insulation and
window replacement
From 2023:
Anyway-costs for
window
replacement
Separate measures: Economic considerations

1978 1983 1988 1993 1998 2003 2008 2013 2018 2023 2028 2033 2038 2043
Fassade
Fenster
1978 1983 1988 1993 1998 2003 2008 2013 2018 2023 2028 2033 2038 2043
Until 2023: no anyway-
costs for window
replacement
Until 2023: additional
savings by window
replacement
Combination of
insulation and
window replacement
Combined measures: Economic considerations

1978 1983 1988 1993 1998 2003 2008 2013 2018 2023 2028 2033 2038 2043
Fassade
Fenster
1978 1983 1988 1993 1998 2003 2008 2013 2018 2023 2028 2033 2038 2043
Until 2023: no anyway-
costs for window
replacement
Until 2023: additional
savings by window
replacement
Replacement
windows
Combined measures: Economic considerations

Net present value of the energy savings by
immediate window replacement over 15 years:
Net present value of the investment for the
immediate window replacement over 15 years:
+2489 Euro
-4075 Euro
----------------
-1586 EuroRequired cost advantage by synergy effects
Cost Advantage by synergy
effects?
Compared to costs for scaffolding: ca. 1300 Euro
Immediate window replacement can save costs for
scaffolding, construction site facilities, approval
Combined measures: Cost savings by synergy effects

Additional costs and effort by intermediate connections

8,2 °C
11,8 °C
Uw=0,91W/(m²K)
Uw,installed
= 1,21 W/(m²K)
Inst = 0,030
Inst = 0,337
Uw,installed
= 1,41 W/(m²K)
Inst = 0,160
12,9 °C
12,5 °C
11,7 °C
10,4 °C
Inst = 0,380
11,8 °C
Uw,installed
= 1,37 W/(m²K)
inst = 0,068
Inst = 0,305
12,4 °C
Window replacement might require compensation

inst = 0,120
Uw=0,91W/(m²K)
Uw,Install
= 1,14 W/(m²K)
inst = 0,079
inst = 0,037
Uw,Install
= 0,98 W/(m²K)
inst = 0,028
inst = 0,002
Uw,Install
= 0,91 W/(m²K)
inst = 0,000
Window should be installed in the right layer, later

Component Award 2015: Windows for step-by-step retrofits

Good air quality: Low CO2 - Concentration
Pettenkofer recommandation
0:00 5:00 10:00 15:00 20:00 1:00
Time
Living room
Spleeping room
Additional benefits: Air quality

EnerPHit Retrofit Plan as output of PHPP
31.6.2016Dear building owner,
in the next few years you intend to modernise your building and to improve stepwise its level of thermal protection. This
"EnerPHit Retrofit Plan" will help you to make the right decisions at each step.
EnerPHit Standard
In the case of refurbishments of existing buildings, it is not always possible to fully achieve the Passive House
Standard with reasonable effort. The reasons for this lie e.g. in the unavoidable thermal bridges due to existing
basement walls. For such buildings, the Passive House Institute has developed the EnerPHit Standard. With the use of
Passive House components, EnerPHit retrofitted buildings offer almost all the advantages of a Passive House building
with optimum cost-effectiveness at the same time:• Comfortable living with uniformly warm walls, floors and windows• Draughts, condensation and mould growth are no longer a problem• Permanent supply of fresh air with a pleasant temperature• Independence from energy price fluctuations• Financial profits from the very first year on due to up to 90 % reduced heating costs
• Climate protection due to decreased CO2 emissions of the same scale
EnerPHit Retrofit Plan
Most buildings are modernised in a step-by-step way when the respective building component needs to be renewed.
Advantage can be taken of such opportunities to carry out future-oriented improvements to the thermal protection of
the building. For example, if the façade already needs to be renewed anyway, the extra effort for thermal protection of
the exterior wall to the Passive House quality at the same time will be manageable. Nevertheless, many
interdependencies exist between individual energy efficiency measures, so that a good standard of thermal protection
can only be achieved cost-effectively if an overall concept is prepared for the entire building prior to the first
modernisation step. With the modernisation route planner, such an overall concept will be worked out for you by your
Passive House Designer or energy consultant. This offers you the following advantages:
• Preparing for future steps already with today's measures will save costs on the whole and will ensure an optimal final
outcome.
• An excellent final outcome can only be achieved if each individual step is implemented with the appropriate quality
(EnerPHit-Standard).
• Once the overall concept has been prepared, it is available for every further step and thus facilitates the planning
process (you don't have to start from the beginning every time).• The energy demand is stated for each step.• The approximate time points for upcoming refurbishment measures are stated in the general plan. This serves as a
valuable aid for personal finance planning.
Pre-certification
The modernisation route planner as well as other relevant documents can be checked by a PHI accredited certifier for
additional quality assurance. If the examination shows that the EnerPHit Standard will be achieved with the
implementation of all planned measures, then the first step can be carried out. After this a preliminary EnerPHit
certificate can then be issued for the building. If quality assurance is continued accordingly for each step, then the full
EnerPHit certificate will be issued for the building upon completion of the last step. A preliminary certificate increases
the value of your building because its potential is clearly demonstrated. It also increases the credibility of the
refurbishment concept in the context of talks with the bank e.g. because the achievable cost saving is available in a
reliably calculated way. Apart from that, you can demonstrate to the outside world that you are committed to climate
protection.
I wish you every success with your retrofit project!
Paul Passive

New feature in the EnerPHit Retrofit Plan (ERP):
Cash Flow diagrams

More information
Free online handbook,
120 pages
www.europhit.eu PHI building criteria


Thank you
for your attention

www.europhit.eu
The sole responsibility for the content of this presentation lies
with the authors. It does not necessarily reflect the opinion of the
European Union. Neither the EACI nor the European
Commission are responsible for any use that may be made of
the information contained therein.

Deep Retrofit: One Step Phased approach

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