energy buildings

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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