1 BUILT ENVIRONMENT FACING CLIMATE CHANGE A framework for the technical evaluation of residential buildings’ energy retrofit Authors: Annamaria Belleri, Chiara Dipasquale, Jennifer Adami Affiliation: Eurac Research Session no.: 4J/28.05.2019 Diamond sponsors BUILT ENVIRONMENT FACING CLIMATE CHANGE A framework for the technical evaluation of residential buildings’ energy retrofit Authors: Annamaria Belleri, Chiara Dipasquale, Jennifer Adami Affiliation: Eurac Research Session no.: 4J/28.05.2019 Diamond sponsors
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1
BUILT ENVIRONMENT FACING CLIMATE CHANGE
A framework for the technical evaluation of
residential buildings’ energy retrofit
Authors: Annamaria Belleri, Chiara Dipasquale, Jennifer Adami
Affiliation: Eurac Research
Session no.: 4J/28.05.2019
Diamond sponsors
BUILT ENVIRONMENT FACING CLIMATE CHANGE
A framework for the technical evaluation of
residential buildings’ energy retrofit
Authors: Annamaria Belleri, Chiara Dipasquale, Jennifer Adami
Affiliation: Eurac Research
Session no.: 4J/28.05.2019
Diamond sponsors
2
BUILT ENVIRONMENT FACING CLIMATE CHANGE
A framework for the technical evaluation of residential
buildings’ energy retrofit
Annamaria Belleri, Chiara Dipasquale, Jennifer Adami
1.2%
Building
renovation
rate in EU
75%
of EU
buildings are
not energy
efficient
Buildings are
responsible
for the 40%
of energy
consumption
Source: EU Building Stock Observatory
3
BUILT ENVIRONMENT FACING CLIMATE CHANGE
A framework for the technical evaluation of residential
buildings’ energy retrofit
Annamaria Belleri, Chiara Dipasquale, Jennifer Adami
Organizational barriers: lack of awareness on renovation benefits, multi-
property buildings, mistrust of stakeholders
Technical barriers: overwhelming possibilities offered by the market, lack of
documented energy savings
Financial barriers: lack of access to finance, priority given to quick rates
of return, uncertainty related to investment payback period
Barriers to energy retrofit
How to evaluate residential buildings’ energy retrofit?
4
BUILT ENVIRONMENT FACING CLIMATE CHANGE
A framework for the technical evaluation of residential
buildings’ energy retrofit
Annamaria Belleri, Chiara Dipasquale, Jennifer Adami
BUILT ENVIRONMENT FACING CLIMATE CHANGE
A framework for the technical evaluation of residential
buildings’ energy retrofit
Annamaria Belleri, Chiara Dipasquale, Jennifer Adami
175
350
220
155150 150
70
50
0
50
100
150
200
250
300
350
400
1920-1954 1954-1989 1989-2004 2004-2014
Numero edifici realizzati Fabbisogno energetico(kWH/m2 anno)
Nr of buildings Heating need
Image courtesy of IPES
social housing
tot 13’500 housing
Social housing building stock in South Tyrol
5
BUILT ENVIRONMENT FACING CLIMATE CHANGE
A framework for the technical evaluation of residential
buildings’ energy retrofit
Annamaria Belleri, Chiara Dipasquale, Jennifer Adami
ID TypologyHeating Degrees
Construction period Apartment nr
1 Small multifamily house 2894 1976-91 8
2 Big multifamily house 2894 1976-91 24
3 Small multifamily house 2894 1946-75 6
4 Small multifamily house 2921 1976-91 16
5 Small multifamily house 3223 1976-91 10
1
2
3
4
5
Reference buildings
6
BUILT ENVIRONMENT FACING CLIMATE CHANGE
A framework for the technical evaluation of residential
buildings’ energy retrofit
Annamaria Belleri, Chiara Dipasquale, Jennifer Adami
PC
Gas boiler
Heat pump
District heating
Radiant floor
Photovoltaic system
KlimaKit retrofit packages
Retrofit package Drivers Intervention type
KlimaKit BASE Deterioration of envelope physical properties
Envelope retrofit
KlimaKit FULL Deterioration of envelope physical properties;Obsolete indoor space distribution;Need of new functionalities.
Envelope retrofitHeat pump installation and new radiant system distribution
KlimaKit FLEXI Deterioration of envelope physical properties;District heating network availability
Envelope retrofitDistrict heating connection
KlimaKit nZEB Deterioration of envelope physical properties;Obsolete indoor space distribution;Need of new functionalities;Zero operation costs
Envelope retrofitHeat pump installation and new radiant system distributionPV installation
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BUILT ENVIRONMENT FACING CLIMATE CHANGE
A framework for the technical evaluation of residential
buildings’ energy retrofit
Annamaria Belleri, Chiara Dipasquale, Jennifer Adami
Uwall [W/m²K]
Uroof [W/m²K]
Ufloor [W/m²K]
Uwindow [W/m²K]
Air tightness [n50]
Mech. Vent. with HR
≤ 0.33 ≤ 0.29 ≤ 0.32≤ 2.20
(double glazing)
3 (CasaClima C)
-
≤ 0.22 ≤ 0.19 ≤ 0.23≤ 1.30
(double glazing)
1.5(CasaClima A
e B)-
≤ 0.15 ≤ 0.15 ≤ 0.20≤ 1.00
(triple glazing)
0.6(CasaClima
Gold)
0.6 vol/hHR 70%
Level 1: comply with minimum requirements of
national and local regulation for buildings undergoing
retrofit intervention;
Level 2: comply with minimum requirements of
national and local regulation to access for incentives;
Level 3: have performance that allow to reach the
target of nearly zero energy. In this case mechanical
ventilation is installed to keep acceptable IAQ levels.
Technical requirements for envelope retrofit
8
BUILT ENVIRONMENT FACING CLIMATE CHANGE
A framework for the technical evaluation of residential
buildings’ energy retrofit
Annamaria Belleri, Chiara Dipasquale, Jennifer Adami
T5.5
T5.6
System efficiency
Pre-retrofit generation system (gas boiler) 0.8
Condensation gas boiler 0.9
District heating 0.95
Heating and Domestic Hot Water (DHW) system model
PV
DHW storage
Space heating set temperature 20 ±0.5 °C
Supply DHW temperature 45 °C
Supply temperature to radiators 45 °C
Supply temperature to radiant panels 35 °C
Generation system
Distribution devices
Buffer
Cost [€/kWh]
CO2 equivalent
emissions
[kg/kWh_final]
gas 0.08 0.249
electricity 0.2 0.647
district heat 0.07 0.15
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BUILT ENVIRONMENT FACING CLIMATE CHANGE
A framework for the technical evaluation of residential
buildings’ energy retrofit
Annamaria Belleri, Chiara Dipasquale, Jennifer Adami
• 3D model
• Available surfaces for PV installation
• Solar radiation (climate conditions, shadings)
• Electricity demand (hourly)
• Tecno-economical inputs (cost variance, PV
degradation)
€
PV modules position
and capacity
Optimization of PV system capacity to minimize NPV
10
BUILT ENVIRONMENT FACING CLIMATE CHANGE
A framework for the technical evaluation of residential
buildings’ energy retrofit
Annamaria Belleri, Chiara Dipasquale, Jennifer Adami