SDH in Graz

Status Quo and future potential

„Solar and renewable district

heating – A sustainable heat

supply concept for local

communities“ Zagreb, 26th of May 2015

• Short introduction of SOLID

• SDH visions of Graz

• Solar District Heating (SDH) plants in Graz

• Perspectives/Challenges of SDH

Content of presentation

Large solar thermal systems (> 1 MW)

• Project development

• Design & engineering

• Construction

• Operation & maintenance

• Financing (ESCo)

• Research & development

S.O.L.I.D Group

Headquarter in Graz, Austria

Subsidiaries in USA & Singapore

Partners in many other countries

Recent reference plants around

the world

Graz, Austria

Office

Solar Cooling

Qingdao

UWC

SZDLC, Al-Ain

CGD

DigiCel

Harvard

Singapore

Phoenix, AZ Pristina

SOLID Office

KFU Graz

KVK Körner

FW Berger

SDH Graz

PepsiCo

DOC

Lanta

DMHS

Hyatt

Partners

Hyatt

Heating

S.O.L.I.D Group

District heating in Graz

• Austria’s second biggest city (290.000 inhabitants)

• DH demand annually of 1050 GWh

• 54,000 housholds

• Length of network: 312 km

• Winter load ~ 450 MWtherm

• Summer load > 15 MWtherm

fossil fired CHP plants, 20 km south of Graz

large scale solar thermal plants

District heating in Graz

• 2 CHP plants 20 km from town for winter operation

• 1 gas-fired heating plant in town

• 1 smaller gas fired Cogen

• Waste heat from steal mill

• Solar Panels installed: > 15,000 m²

• 1 % solar fraction of total DH demand

fossil fired CHP plants, 20 km south of Graz

large scale solar thermal plants

• 500,000 m² collector area; 250 Mwthermal; 210 GWh / year

• Biomass plant; 40 MW thermal; 100-200 GWh/year

• Solar & biomass should cover approx. 30 % of the total DH demand

• Should be realized within 5 years

SDH Vision for Graz

SDH Vision for Graz

SUMMER

SDH Vision for Graz

WINTER

SDH Vision for Graz

UPC Arena, Graz

• Collector array: 1.407 m²

• Solar yield: 540 MWh/ year

• Thermal load: ~ 700 kW

• Commissioning: 2002

• Energy service contract

First solar feed-in plant in Graz

Berliner Ring

1st priority:

DHW + room heating for building

under collector field

2nd priority:

Grid of Berliner Ring, sub-grid of

Graz’ DH grid

3rd priority:

2 buffer storages of 30 m³ each

Commissioned in 2003; 2400 m² collector array on six buildings; ESCO concept

AEVG Graz

• Collector array in 2014: 6.960 m²

• Solar yield: approx. 2.000 MWh/ year

• Thermal load: approx. 3.500 kW

• Commissioning: 2008

• Extension of 2000 m² in September

2014 ; testing of 4 different flat plate

collectors

Austria’s largest solar thermal plant, connected to gas fired heating plant

AEVG Graz

• Collector array in 2014: 6.960 m²

• Solar yield: approx. 2.000 MWh/ year

• Thermal load: approx. 3.500 kW

• Commissioning: 2008

• Extension of 2000 m² in September

2014 ; testing of 4 different flat plate

collectors

Austria’s largest solar thermal plant, connected to gas fired heating plant

AEVG Graz

Combined room heating and district heating

Waterworks Andritz, Graz

• Collector array: 3.855 m²

• Solar yield: ~ 1.660 MWh/ year

• Thermal load: approx. 2.000 kW

• Commissioning: 2010

• Energy service contract

Waterworks Andritz, Graz

Perspectives / Challenges

• Solar district heating is a proven technology

• In recent years increase in possible collector

temperatures, decrease in grid temperatures -> better

match

• High potential in combination with seasonal storages

• Customers in Graz are willing to purchase “solar district

heat” (idea of feed-in model)

• Variations in electricity production from wind power

and photovoltaic are challenge for effectiveness of

summer operation of CHP systems favourable for

solar thermal

Thank you for your attention!

Co-funded by the Intelligent Energy Europe

Programme of the European Union

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