integrated approach for retrofitting of the flat roofs of ... trschool 2… · integrated approach...
TRANSCRIPT
Integrated approach for retrofitting of the flat roofs of the buildings at 21 block in New Belgrade, Belgrade, Serbia
Group 4:Jelena Nikolic, Laura Gagyte, Pablo Villarejo, Nikolay Enchev
COST ACTION TU1104
Training School: "Integrated approach to retrofitting existing dwellings"
Content
Problem1
Methodology2
Analysis3
Results4
Problem
Problems
in the top flats there are:
water infiltration;
heat losses during cold season;
heat gains during warm season.
ground floors are not integrated in the social life;
hot water is produced by electric boilers.
COST ACTION TU1104 Training School: "Integrated approach to retrofitting existing dwellings
Methodology
COST ACTION TU1104 Training School: "Integrated approach to retrofitting existing dwellings
Methodology
short term analysis;
long therm analysis (the buildings will be insulated, windows will be changed, air infiltration
to the buildings will be reduced, mechanical ventilation will be needed, the space for ventilation
equipment will be needed);
financing analysis;
social analysis.
CHOICES
An improved, flat roof / an additional, pitched roof
changing the primary energy source for water heating / producing
renewable electricity
If electricity is produced it can be solar panels, wind turbines, biomass
or heat pumps…
Problem - Solution
COST ACTION TU1104 Training School: "Integrated approach to retrofitting existing dwellings
Inte
gra
ted
kit
of
part
s s
yste
ms
ROOF
HEAT LOSES/GAINS
WATER LEAKEAGES
SOLAR RADIATION
FUTURE VENTILATION NEEDS
ELECTRIC WATER BOILERS
NEW USES FORGROUND FLOOR
ACTIVE SYSTEMS
IMPROVED ROOF
PV ARRAY
INCOMESSOURCES
PROs
Lower maintenance needs for
pitched roofs
Space for future technical systems
Less impact on dwellers
Smaller installation costs for a PV
array (other technologies offer smaller
returns, the pitched roof offer a substructure
for it)
Façade is not used for energy
production (less visual impact)
FIT feed in tariffs
CONs
Impact on the aspect or cultural
value of buildings
Agreement of owners needed
High upfront costs (grants and investors
needed)
Technical management needed
Analysis
Regarding the energy efficiency of the current building systems, heating is
provided by a district heating scheme and in the medium term a surge in
cooling demand is not expected.
Nevertheless, there is scope for the production of renewable electricity given
the fact that hot water is currently provided by electrical individual boilers, and
a FIT programme is in place in Belgrade
Therefore, a new pitched second roof is proposed, with PV panels attached to
it. This structure produces a shaded, ventilated space over the former roof that
will also be insulated and offer room for future ventilation system, with access
to the chimneys over the existing shafts.
COST ACTION TU1104 Training School: "Integrated approach to retrofitting existing dwellings
Results: 1st phase
COST ACTION TU1104 Training School: "Integrated approach to retrofitting existing dwellings
Results: 1st phase
COST ACTION TU1104 Training School: "Integrated approach to retrofitting existing dwellings
Results: 2nd phase
COST ACTION TU1104 Training School: "Integrated approach to retrofitting existing dwellings
Mechanical ventilation with heat recovery
Results
COST ACTION TU1104 Training School: "Integrated approach to retrofitting existing dwellings
Financial plan
The proposal described has two phases: the construction of a new, insulated roof with
PV panels; and the later implementation of a ventilation system.
In both phases there are common elements that must be installed with the agreement of
all owners: these are the roof itself and the ventilators and heat recovery units for the
ventilation systems. There are also some equipment that each owner can install when
she/he decides, as the PV panels and the ducts that provide each dwell with artificial
ventilation.
The common infrastructure’s costs should be financed mainly with public funds for
energy efficiency: Belgrade’s local government is bearing up to 70% of the cost of that
kind of projects.
Individual systems should be paid by tenants via low rate loans provided by the state.
The installation of PV panels makes it possible for them to recover the cost of the
photovoltaic system itself and also to recover the part of the costs of the common
infrastructure they have to pay for, gradually via feed-in tariff. Also, income from the rental
of ground floor spaces can be considered.
THANK YOU FOR YOUR ATTENTION!