The presentation introduces you to the work of the GrowSmarter Lighthouse City of Cologne on smart solutions for energy retrofitting of residential buildings.

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THE GROWSMARTER PROJECT
2015-2019
WP2 Webinar Low Energy Districts
Christian Remacly, RheinEnergie AG
André Esser, DEWOG

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1. Applied Measures
2. Barriers/ challenges during implementation
(and accomplishment of barriers/ challenges)
3. Business models
4. Evaluation strategy
AGENDA
Practical approaches - how to overcome technological and social barriers
on smart refurbishment

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Applied Measures
• insulating the building envelope
• basement ceilings and roofs
• introducing the triple glazed windows in
some buildings.
• Efficient LED stairway lighting in all
renovated buildings
• energy efficient elevators

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Additionally insulation to 16cm
Building with new insulation
Already existing insulation of 6cm
Preparation of elevator shaft
Applied Measures
insulation of the buildings

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• The refurbishment of the first construction phase is completed by DEWOG.
• The second construction phase is in progress.
• The conduction work (district heating, electricity and water) is finished.
Applied Measures

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Renovated building with new balconies
as well as elevator with energy
recovery
The houses were artistically
designed by an artist from
DEWOG
Applied Measures

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Barriers/ challenges during implementation
• Unforeseen difficulties in civil engineering work.
• This lead to, among other things, to delays in the installation of the heat pumps.
• Work on the site has nevertheless continued steadily.

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Barriers/ challenges during implementation
• Unforeseen difficulties working the soil (i.e. bomb findings from WWII).
• Long permit process
• Mitigating measure: RheinEnergie supplied heating containers during the first phase of
construction by the Dewog.
• Problems with the concept of thermal contracting.
• DEWOG was not allowed to buy the air / heat pumps on its own and in cooperation with the
RheinEnergie.
• Brought the air / heat pumps via RheinEnergie and thus had to transfer the EU budget.

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Barriers/ challenges during implementation
• Major challenge: renovation of the buildings while the tenants still live in the settlement
• We try as thoughtfully as possible to carry out the refurbishment.
• Over the Christmas season there has been a construction stop for the tenants
• The rise in rent in our project area is limited due to a local legislation*.
• Therefore, the rent increase will be at a limit of 9,97 Euro per m².
*
In order for rents not to rise excessively (social tolerance), Germany has a system called “Mietpreisbremse”, meaning “putting a break
on rental prices”

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Business model – Stegerwaldsiedlung
Smart Solution 1: Efficient and Smart Climate Shell Refurbishment
Key Partners
Industrial partners: Dewog
Technical partner:
RheinEnergie
private sector and building
owners;
public authorities to
incentivize collaboration.
Cologne: DEWOG,
providing the buildings and
RheinEnergie providing the
technology
Key Activities
change to a centralised
heating system in the
buildings
Value Propositions
refurbishment of the
buildings, to reduce energy
consumption
Customer
Relationships
Owners` communities or
companies
Customer Segments
Private sector:
Housing buildings
Corporate buildings
Malls and stores
Public administration:
Internal use: Public
buildings (City Councils
buildings, public libraries,
hospitals, etc.)
External use: public
housing
Key Resources
Construction materials;
financial resources, human
resources, technology
Channels
The solution is offered by
real estate companies (in
new developments) or
architects and construction
companies (in brownfield
projects) as an added
value to final customers
(either households or
companies) to reduce their
energy bills, improve
service, increase wellbeing
or adopt an
environmentally friendly
approach in the energy
use.
Cost Structure
Hardware related costs: façade, roof and ceiling insulation products, triple
glazed windows, high efficiency circulation pumps, lifts with energy
recovery, LED lamps
Revenue Streams
Modernize the infrastructure implies a reduction in energy costs,
generating savings.

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Baseline Methodology of evaluation Parameters to be monitored KPIs
Baseline for Heating, Cooling
and Electric energy;
annual energy demand
(kWh/m2) corrected for ambient
conditions
Heating-, Cooling- and Electric
energy demand will be measured
every hour over one year (12
consecutive months) and the
climate corrected annual energy
demand after implementation of
measures will be compared to the
baseline.
heating [kWh/m²/a]
electricity in total [kWh/m²/a]
Heat energy required (kWh) per year
and month normalized for climatic
conditions.
Cooling energy required (kWh) per
year and month normalized for
climatic conditions.
Electric energy required (kWh) per
year and month.
bought energy mix (per energy
carrier)
-Nuclear power
-Coal
-Natural gas
-Other
-Renewable energies
Emission data
CO2-emission [kg/kWh]
nuclear waste [g/kWh]
CO2 emissions due to heating
energy demand (kt/year).
CO2 emissions due to cooling
energy demand (kt/year).
CO2 emissions due to electric
energy demand (kt/year).
Evaluation strategy - Stegerwaldsiedlung
Smart Solution 1.0 Evaluation of building energy use

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Baseline
Methodology of
evaluation
Parameters to be
monitored
KPIs
We are only able to raise
a baseline for the 3rd
construction phase
Instantaneous
measurement of air leakage
with blower door
Air leakage in air changes
per hour at 50 Pa (ACH50)
Thermal imaging
Comparison new/old
We are going to do a Thermal
bridge proof
Thermal imaging
4 (for each type one
measurement)
We are going to do a thermal
imaging of the building
Evaluation strategy - Stegerwaldsiedlung
Smart Solution 1.0 Evaluation of building energy use

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Evaluation strategy - Stegerwaldsiedlung
Smart Solution 1.1 Low U-values of windows
Baseline
Methodology of
evaluation
Number of
measurements
KPIs
Comments
We are only able to
raise a baseline for
the 3rd construction
phase
Thermal status (U-
value) determination of
windows (e.g. by
measurement)
Solar gain coefficient
(%) (manufacturer
specification) is determined from the
window data, no
measurement, proof
by the window builder
Thermal status
measurement of
randomly selected
windows in each of the
reference buildings
5

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Evaluation strategy - Stegerwaldsiedlung
Smart Solution 1.1.9 efficient lighting
Baseline
Methodology of
evaluation
Parameters to be
monitored
KPIs
Measure property
electricity consumption
(kWh/m²) for a year.
Measure property
electricity consumption
(kWh/m²) for a year.
Lighting intensity (lx)
Lighting intensity,
illuminance (lx).
we will measure the
actual outcome for one
typical installation
Lighting intensity,
illuminance (lx).
Annual electric energy use
(kWh/m2).
Reduction of electrical
consumption related to
baseline.

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This project has received funding from the European Union’s Horizon 2020 research and innovation programme under grant agreement no 646456.
The sole responsibility for the content of this presentation lies with the GrowSmarter project and in no way reflects the views of the European Union.
QUESTIONS?
THANKS FOR YOUR ATTENTION!
RheinEnergie AG Deutsche Wohnungsgesellschaft mbH
Parkgürtel 24 Mevissenstraße 14
D-50823 Köln 50668 Köln
Corporate Development Fixed assets
c.remacly@rheinenergie.com a.esser@dewog.de
Christian Remacly André Esser

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