7. Zdravko Genchev the road to NZEB

1. PhD Arch. Zdravko Genchev
EnEffect
20 years National Trust EcoFund Bulgaria
THE ROAD TO THE
NEARLY ZERO-ENERGY
BUILDING

2. 8-9 March, 2007
By 2020:
Reduction of greenhouse gases
Reduction of energy consumption
RES as a share of the produced energy
20%
20%
Above 20%
Historical solution
POLICY OBJECTIVES

3. The results so far
(reduction of the energy consumption)
POLICY OBJECTIVES

4. Objectives by 2030
Reduction of the emissions of greenhouse
gases by 40% compared to the level from 1990.
The share of the renewable energy sources
(RES) within EU should be at least 27%
Improvement of the energy efficiency by 30%
(non-binding objective)
POLICY OBJECTIVES

5. Energy Performance of Buildings Directive
Transition to nearly zero-energy
buildings (nZEBs) after 2020 (2018
for public buildings)
Introduction of energy efficiency
categories with fixed values of the
integrated energy characteristic -
kWh/m2.a (кWh/m2/year).
POLICY OBJECTIVES
Category
(class)
EPmin,
kWh/m2
EPmax,
kWh/m2
А+ < 48
А 48 95
B 96 190
C 191 240
D 241 290
E 291 363
F 364 435
G > 435
Residential buildings
G
F
E
D
C
B
A
A+

6. Energy Performance of Buildings Directive
Labeling of low-energy buildings
POLICY ACTIONS

7. Energy Performance of Buildings Directive
Източник:
The Netherlands Denmark The United Kingdom
Norway GermanyBelgium
The experience of the
EU countries
POLICY ACTIONS

8. Energy Performance of Buildings Directive
The experience of
Germany
POLICY ACTIONS

9. passiveactive
High quality energy
cover
Continuous energy
supply
From “passive” to “nearly zero-energy” building
DEFINITION

10. The passive building can be heated only through the
fresh air from the ventilation system
Energy consumption
for heating max. 15 kWh/(m²/year)
or heat load max. 10 W/m²
Energy consumption
for cooling max. 15 kWh/(m²/year)
Primary energy consumption
kWh/(m²год.) max. 120
Airtightness
of the building max. 0.6 /h (50 Pascal)
Overheating frequency max. 10 %
The computation
has been made with the software
package for passive building
design (PHPP)
Criteria
for residential building for
the climate in Central
Europe,
incl. The United Kingdom
From “passive” to “near zero energy” building
DEFINITION

11. 1
2
3 4
5
of the passive building
6
DEFINITION

12. 1. Optimal solar gains
2. Improved thermal insulation
3. High-quality doors and windows
4. High air density
6. Ventilation with recuperation
5. Minimal thermal bridges
Physical
properties of
the building
The “Passive House” concept
of the passive building
DEFINITION

13. 7
9
8
of the nearly zero-energy building
DEFINITION

14. Socio-political
requirements
7. Economic efficiency
9. Minimum СО2 emissions
8. High RES share
Socio-political elements of the “Passive House”
concept
Requirements of the Energy Performance of
Buildings Directive of EC (renewed in 2010)
Additional requirements towards the nearly
zero-energy buildings
DEFINITION

15. 1. Optimal solar gains
2. Super insulation
3. High quality doors and windows
6. Ventilation with recuperation
5. Minimal thermal bridges
7. Economic efficiency
9. Minimal СО2 emissions
8. High RES share
4. High air density
Physical
characteristics
of the building
Socio-political
requirements
Nearly zero-energy building (nZEB)
DEFINITION
IMPLEMENTABILITY

16. “PassiveHouse”
Standard15
kWh/m2.a

17. “Passive House”
Standard 15 kWh/m2.a

18. “PassiveHouse”
Standard15kWh/m2.a

19. Determine objectives, which correspond to the long-term
obligations of the country within the framework of the
European Union
Assign high priority to the financing of public sites (state and
municipal)
Apply financial incentives based on the “payment according to
the savings” principle
Increase the quality control to achieve maximum efficiency
and return on investment of the invested public funds
Create conditions for mobilization of additional (out-of-budget)
financial resources to increase the responsibility of the
beneficiaries and the donors for efficient utilization of the
investments
RECOMMENDATIONS

20. Put aside a mandatory allowance to finance pilot projects (for
new and for renewal of existing buildings) with high energy
characteristics
Introduce and endorse mandatory monitoring on sites (new or
refurbished), financed with public funds
Conduct systematic and wide-scale communication
campaign on national and local level to clarify the benefits
from the increase of energy efficiency
Create conditions for staged introduction of professional
management, in this number of energy management of the
buildings
RECOMMENDATIONS

21. Thank you for your attention