1. INTEGRATED APPROACH TO ENERGY EFFICIENCY IN CULTURAL HERITAGE BUILDINGS
Margareta Zidar, B.Sc.Arch.Eng.
Željka Hrs Borković, B.Sc.Arch.Eng.
Energy institute Hrvoje Požar – RES and EE department
International conference Energy management in cultural heritage, Dubrovnik April 6-8, 2011

2. Structure
Energy certification procedure in Croatia
Energy efficiency and preservation principles

3. Energy certification procedure in Croatia
EU Directive 2002/91/EC on the energy performance of buildings
Transparent data on energy demand of a building to the owners, users and the market
Energy audit provides calculation of annual heating demand QH,nd - for actual and reference climate conditions
Total primary energy demand Eprim (kWh/a)
CO2 emission generated by energy source
Energy performance analysis directed at suggestion of feasible energy efficiency measures

4. Energy efficiency and preservation principles
Energy concept
Adapted to specific building – age, use, indoor requirements
Integrated and optimal combination of energy efficiency measures incorporating quality of construction, energy supply optimization and decentralization (RES), efficient energy use, lifecycle assessment and minimizing environmental footprint
Systematic energy refurbishment of the existing buildings and construction of efficient and autonomous new buildings - National energy conservation goal
Cultural heritage public buildings
Incoherent planning and maintenance practices throughout long life span, high energy consumption and low efficiency technical systems - poor energy rating in E, F or G classes
Climate change effect - material corrosion - O3 effect on copper, cast bronze and limestone
Goal: reduce the negative effect on own preservation

5. Energy efficiency and preservation principles
Integrated approach and balancing energy and economy savings, mitigating carbon footprint and environment impact, preserve appearance and improve durability
Pre 1900 buildings - historic styles: built in natural materials, brick, mortar, wood, rarely using concrete and steel, maintaining durability without using innovative solutions in construction, energy or maintenance practice
Post 1900 buildings – modernity: built in generic materials as concrete, aluminum, steel, plastic, incorporating innovative principles but not achieving higher durability, maintenance or energy standards
Energy demand optimization, use of efficient and innovative systems with renewable energy sources, reducing energy and management costs, improving indoor comfort and minimizing environment impact.

6. Energy efficiency and preservation principles
Building
Year of construction
Energy rating
Hospital for continued nursing in Duga Resa
1900,
refurbished in 2001 G
Energy efficiency measures
Investment -
Pay-back period
CO2 savings
Insulation of ceiling toward attick
Change of boiler, automation and regulation (TRV)
Solar thermal for DHW
Reactive power compensation, change of lighting fixtures
€ - 2,2 y
€ - 1,2 y
€ - 6,3 y
5 y
110 t
30%

7. Energy efficiency and preservation principles
Building
Year of construction
Energy rating
Office building in Split
1930
refurbished in 1997 D
≤ 100 kWh/m2a
Energy efficiency measures
Investment -
Pay-back period
CO2
savings
Insulation of flat roof and courtyard walls
Heating and cooling system balancing
Solar thermal for DHW
Installation of efficient bulbs (reducing power capacity)
€ - 20,5 y
8.740 € - 9,5 y
3.850 € - 5 y
3.150 € - 4,6 y
16 t
20%

8. Energy efficiency and preservation principles
Passive house standard: 10+ refurbishment factor
Energy autonomous building
RES for heating (flat ground source collector and heat pump) and electricity generation (PV)
Passive cooling technique
Daylighting control
In compliance with EPBD 31/2010
PAUAT Architekten ZT GmbH, DI Heinz Plöderl, Team GMI Ingenieurbüro GmbH, DI Michael Berger: Fronius International GmbH, Management Board Corporate Services, build in Wels, Austria

9. Conclusion CONSERVATION DEVELOPMENT BUILDINGS URBAN SPACE PLANNING
RESEARCH
ART
BUILDINGS
URBAN SPACE
SCIENCE
Living and natural environment
Natural RES potential
Heritage values
Energy certification
PUBLIC INTEREST
ADDED VALUE

10. THANK YOU FOR YOUR ATTENTION !
Margareta Zidar
B.Sc.Arch.Eng.
Željka Hrs Borković
B.Sc.Arch.Eng.