Transcript
Net Zero Energy Buildings (NZEB)
Helder Gonçalves 25.6. 2012
IEA SHCP Task 40 / ECBCS Annex 52 Towards Net Zero Energy Buildings Prof. Karsten Voss
University Wuppertal, School of Architecture, Building Physics and Technical Services, Germany
Towards Net Zero Energy solar Buildings (October 2008 – September 2013)
NZEB - definition
• Heating
• Cooling
• Lighting
• Hot Water
• ……?
x Kwh
Energy
Demand
Energy
Supply
• Electricity
(PV, wind…….)
• Thermal (Solar, Geothermal )
y Kwh
Input = Output
Energy
Demand
Energy
Supply
Energy Demand
Energ
y S
upply
How to achive NZEB ?
Energy Demand
Energ
y S
upply
Building regulation
requirements
Energy Efficiency
Renewables
How to achive NZEB ?
Def
iniç
õe
s/M
eto
do
logi
as/D
esa
fio
s
Input = Output
Energy
Demand
Energy
Supply
Specific balance items
Balance boundary
Metric (Primary energy, carbon emission, cost)
Balance items (heating, cooling, DHW) Balance period
Challenges
Net ZEB Performance Indicators
Common Definition Framework
Building Code Relevance
Architectural Integration
Monitoring /Measured data
RECAST EPBD
DIRECTIVE 2010/31/EU OF THE EUROPEAN PARLIAMENT AND OF THE COUNCIL of 19 May 2010
on the energy performance of buildings
(recast)
Article 9
Nearly zero-energy buildings
1. Member States shall ensure that:
(a) by 31 December 2020, all new buildings are nearly zero- energy buildings;
and
(b) after 31 December 2018, new buildings occupied and owned by public
authorities are nearly zero-energy buildings.
Member States shall draw up national plans for increasing the number of nearly
zero-energy buildings. These national plans may include targets differentiated
according to the category of building.
Nearly Zero-Energy Buildings/Edifícios com necessidades quase nulas de energia
1. Definição
EPBD recast
Article 2
Definitions
‘nearly zero-energy building’ means a building that has a
very high energy performance, as determined in
accordance with Annex I. The nearly zero or very low
amount of energy required should be covered to a very
significant extent by energy from renewable sources,
including energy from renewable sources produced on-
site or nearby;
Low energy
building nZEB
necessidades energéticas
pro
du
ção
de
ener
gia
-
+
=
Necessidades energéticas (kWh/m2a)
50 100 150
Pro
dução d
e e
nerg
ia (
kW
h/m
2a)
50
100
150
Limite regulamentar
Balanço “Quase” Zero
Balanço Zero
NZEB na Revisão regulamentar
Helder Gonçalves – 19 Junho 2012
NZEB na Revisão regulamentar
Questões a ponderar
1.Que valor para as necessidades
energéticas (15kWh/m2 ano???) ou ????
2.Energias Renováveis ?
a. Qual a % no Balanço? Quase (“Nearly”)
50-75% ? Ou 50-90% ? Ou outro ?
b. On site or nearby ?
c. Contabilização “Green Electricity”?
Helder Gonçalves – 25 Junho 2012
necessidades energéticas
pro
du
ção
de
ener
gia
-
+
=
nZEB
Energy Demand
En
erg
y S
up
ply
Renewable energy share ?
Como alcançar NZEB
• Lighting
•Equipments
•Passive Systems
•Daylighting systems
•Natural Ventilation
•Building Envelope • Optimization of
solar gains
Tecnology Strategies
Efficient Systems
Urban Integration
energy needs
enegy supply
energy efficiency
demands reduction
ren
ew
ab
les fe
ed
1º passo2º
pa
sso
1º step: reduction of the demand in
buildings
How to reach NZEB ?
energy needs
enegy supply
energy efficiency
demands reduction
ren
ew
ab
les fe
ed
1º passo2º
pa
sso
2º step; energy production
NZEB na Revisão Regulamentar
Helder Gonçalves – 25 Junho 2012
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