sustainable city of zurich on the way to the 2000-watt · pdf filesustainable city of zurich...

Sustainable City of ZurichOn the Way to the 2000-Watt Society

LCM 2007 - From Analysis to ImplementationZurich, August 27 - 29, 2007

Dr. Annick Lalive d'EpinaySustainable Construction, City of Zurichwww.stadt-zuerich.ch/nachhaltiges-bauen

Stadt ZürichAmt für Hochbauten

LCM 2007 - From Analysis to ImplementationAugust 27 - 29, 2007

Building Department of Zurich"Amt für Hochbauten"

110 motivated employees are our greatest asset

4000 city-owned buildings with

8 billion US $ insured value are our sphere of activity

20 Mio. US $ we provide in services

330 Mio. US $ are our turnover



– 4000+1200 buildings are owned by the municipal City of Zurich.– 80% of the buildings were erected before 1980. – 400 million Swiss francs are invested annually by the City of Zurich.

Introduction

All new city-owned buildings are constructed to meet the 7 mile steps for energy and resource efficiency.



7 Mile Steps to Energy and Resource Efficient Building



School Building "Kügeliloo", Extension 2004

1 MINERGIE Standard for New Building Constructions



MINERGIE Standard for Refurbishment(>25% Energy Reference Area)2

Housing Development "Heumatt" 2005



MINERGIE Standard for Lighting & Efficient Appliances3

School Building "Apfelbaum"



The Letzigrund stadium will be the first Zurich owned construction equipped with a wood pellet heating system. The city’s largest solar power system with 250 kW peak power will be on the roof, supplemented by 100m2 solar collectors, providing pre-warming for hot water.

Renewable Energy (>25% in New Constr) Pilot & Demonstration Projects4

New "Letzigrund" Stadium



Increased Requirements in Building Ecology & Indoor Environmental Quality 5

91% Concrete with reused + recycled aggregate45% Concrete aggregate in walls and ceilings46% Aggregate from refuse dump excavated on site and processed in

special soil washing plant to waterproof / prestressed concreteSchool Building "im Birch"



Environmental Sustainability as Decision-Making Criteria in Architectural Competitions6



School Building

0%10%20%30%40%50%60%70%80%90%

100%materials

operating energy

soil/landscape

location/infrastructure

building status

operating costsvalue

well being

utilisation

design

community

7 Sustainable Facility Management

Improvement due to refurbishment



Result: 19 Architectural Competitions Amt für Hochbauten 1998 –2006

2000 apartments

1998 2006

Min

ergi

eIn

dex

[kW

h/m

2 ]

70

60

50

40

30

20

10

0

MINERGIE

Energy Index of different housing developments, 1998 - 2006



City Council Program Sustainable City of Zurich – on the Way to the 2000-Watt-Society

– The 2000-Watt-society is a vision: everybody in the world will be able to use the same amount of energy

– High quality of life and high living standard for today‘s and future generations

– A policy for the environment to reduce energy consumption and global warming in a long-term perspective (at least to 2050)



The Vision of the 2000-Watt-Society

Development in energy requirements per person

Wat

ts p

er p

erso

n

Total Energy requirements

Fossil energy



Legislature Goal Sustainable Zurich City – on the Way to the 2000-Watt-Society

Crossroads for the2000-watt-society

Lighthouse project for 2000 Watt society

Reduction:Energy to 2000 W/personCO2eq to 1 t/person

Development in energy requirements per person

Wat

ts p

er p

erso

n

Total Energy requirements

Fossil energy



Buildings for the 2000-Watt-Society

In the four aspects: Energy, Building Materials, Electricity andMobility, increased efficiency must be achieved in building concepts.The MINERGIE standard is not good enough!

Energy Materials Electricity Mobility



Experiences and Examples

Energy, Minergie-P for new buildingsMaterial 100 MJ/m2a embodied energy

(SIA energy-efficiency-path)

Energy & Material Efficiency is already predetermined in the competition project

Electricity Very good products are notalways available. There is a need for innovation.

Mobility This issue is rarely addressedbut has a big impact.

Old peoples home "Trotte"

New patients building of the city hospital "Triemli"

Housing Development "Sihlbogen"

Office Building "Werd"Housing Development "Werdwies"



Energy and Material Efficiency:Predetermined in the Architectural Competition!

Architects and Planners should be able to actively improve their architectural projects during anarchitectural competition.

We need a better understanding of the main factorswhich influence the energy consumption in a building.

Competition-Calculation (WW-Kalkulation), using the same input data for estimates of

• costs• embodied energy• operating energy

Energy

Materials

1

5



Competition Calculation "WW-Kalkulation"Method

Energy

Materials

1

5



Competition Calculation "WW-Kalkulation"Results

Energy

Materials

1

5



The project will meet the MINERGIE-P-ECO standard.

The amount of embodied energy is actively reduced and calculated several times during the planning process.

Old Peoples Home "Trotte"

compactness:best volume/surface-ratio

well positioned windows for optimised solar gains

favourable construction and material choices

2nd place Edelmann Krell 3rd place Harder & Spreyermann

Enzmann + Fischer AG



New Patients Building of City Hospital "Triemli"

The project will meet the MINERGIE-P standard

Renewable energy sources(geothermic or wood) will be used. The CO2 reduction amounts to 80%.

It will be completed in 2013.

compactness:best volume/surface-ratio

most flexible room organisation

favourable technical installation concept with system separation

Atelier WW + KSP Engel und Zimmermann GmbH Weber + Hofer AG

APH Architekten AG



ElectricityThere is a Need for Innovation!

Electricity4

Housing Development "Werdwies"

Only energy efficient A class household appliances are purchasedfor municipally owned properties.E.g.: Heat pump tumblers in a social housing development



ElectricityThere is a Need for Innovation!

Electricity4

Office Building"VZ Werd"

A competition was launched to develop a highly energy efficient floor lamp for office buildings. www.topten.ch



Mobility7

Housing Development "Sihlbogen"Building Cooperative Zurlinden

In the housing development "Sihlbogen" there are fewer cars than people. This meant that the number of parking spaces could be reduced

Instead of cross-subsidising by simply reducing the monthly rent, the tenants receive an annual ticket for all public transport facilties in and around Zurich.

The railway station is located inside the settlement.

MobilityCompletely New Concepts Are Necessary



Thank you for your attention

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