large solar thermal systems - celsius initiative...solar thermal concept • 10.000 m2 solar thermal...

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Large solar thermal systems (> 1 MW)

• Project development

• Design & engineering

• Construction

• Operation & maintenance

• Research & development

SOLID Portfolio

This project has received funding from the European Union’s Seventh

Programme for research, technological development and demonstration

under grant agreement No 314596

OBJECTIVE:

To demonstrate a highly replicable, cost-effective and high

energy efficiency large scale energy generation system, that

will allow sustainable urban planning of very low energy city

districts

PITAGORAS Main Objective




“Sustainable urban Planning with Innovative and low energy

Thermal And power Generation frOm Residual And renewable

Sources”

pitagorasproject.eu

EC / FP7 funded Smart City Project

Duration: 4 years (Nov 2013 – Oct 2017)

PITAGORAS project focuses on the efficient integration

of city districts with industrial parks through smart thermal grids

Technologies and concepts for low and medium temperature

waste heat recovery and heat supply to cities will be developed

and demonstrated

PITAGORAS – SCOPE




Implementation Objectives:

Implementation of 2 demonstration plants to test and validate

the developed systems and concepts in real conditions

Demonstration 1:

Brescia (Italy): medium/high temperature waste heat recovery

(600ºC) from a steel foundry and ORC unit (2,1 MWe) for heat and

power generation including heat storage. District heating to a city

district nearby

Demonstration 2:

Kremsmünster (Austria): ESCo project (Energy service – selled heat)

Large solar thermal plant (5 GWth/a ≈10.000m2 collector area)

feeds in seasonal thermal energy storage, connected to industry for

waste heat recovery. District heating to a city district nearby

PITAGORAS Demonstration




DH grid of Kremsmünster

• 30 year old DH grid

Design Temperatures 80/60 and 80/65 °C

• 65% of the heat consumed in the city covered by DH

(20 GWh/year)

• Sources of the DH:

- CHP plant of RAG 75%

- Gas boiler for peaks 17,5%

- Biomass heating plant + waste

heat from a glass manufacturer 7,5%

Kremsmünster

Kremsmünster – Pilot plant description




Company RAG= Raw oil

prospecting and processing

company

• Oil production

• CHP plant currently

supplies electricity for RAG

and feeds in heat for DH

grid + additional gas boilers

• CHP heats 4 x 60.000m³ oil

tanks designed for 55/20

or 46/10°C

• Each storage 1.500kW

nominal thermal capacity





Solar thermal concept

• 10.000 m2 solar thermal system

with flat plate collectors

• 300 m³ buffer storage

• 3 different integration points:

a. Feeding in DH

b. Pre-heating of raw oil

c. Heating of 4 x 60.000m3 oil

tanks up to approx. 30°-

40°C STES “Seasonal

Thermal Energy Storage”

SOLAR





Oil tanks as “seasonal storage”

• Currently heated by CHP – waste

heat to keep oil at 23°C, in winter

time gas boiler is also needed

• Using temperature up to ~ 35°C

for seasonal concept

• Buffering surplus heat from solar

thermal system at low temperature

(= high efficiency of solar collectors)

from summer to winter; gas savings

in winter time!!





Kremsmünster – Hydraulic Scheme




Kremsmünster – Existing Oil Tank




Conversion of Oil Tank into STES

• Check of detailed construction and statics of the existing tank fits to

a usage as a STES (Seasonal Thermal Energy Storage)

• Inventory survey of the conditions of the construction of the STES

itself and the envelope (e.g. use of existing heat exchanger)

• Simulations to derive necessary refurbishment of the envelope and

charging and discharging devices (TRNSYS)

• Development of a variant of conceptual designs for the conversion of

the existing tanks into a STES

• Economic analyses of different variants to find the most economic

one - Result: most economic conceptual design for the conversion

of the existing tank into a STES




Kremsmünster – Chosen Concept STES




•Saving of 3,5 to 5 GWh of fossil fuels

•Substitution of Gas BoilerEnergetic

•Reduction of Greenhoouse gas: appr. 1500 tons/yearEnvironmental

•Efficiency increase of CHP plant

•Economic savingsIndustry

•Peak loads covered

•Significant share (25%) of RESCity / DH net

•High replicable system withmultiplication factorPITAGORAS

Kremsmünster Plant – Calculated

Impact




Austrian Demo failed

• Barrier low oil price: RAG has been heavily hit by the decline of oil and

gas price

• All service contracts to RAG have been cancelled including heat

delivery contract between RAG and solar.nahwaerme

• Oil exploration projects had been stopped

• RAG cut down their business in 2015 tremendously (situation in 2016

is not known by today)

• RAG General Director actually was in favor of the solar/storage

project and is willing to vitalize the project in future, but no realization

within PITAGORAS frame is possible due to missing funding

• RAG did not allocate costs for the project development to PITAGORAS




Non-technological Barriers

General non-technological barriers for implementation of a demo like

Kremsmuenster:

• Low awareness on the demand side takes much time to convince

clients not only of the technology, also of the energy and cost savings

• Problems in implementing ESCO projects in public sector are higher

than in industry

• Financial institutions are not willing to finance ESCo projects or

provide bad lending practices

• Lack of standardized documents and procedures

• Low energy (gas/oil related to PITAGORAS) prices

• Lack of energy consumption data in many cases




How to overcome the Barriers

What is needed?

• More awareness raising activities workshops, preparation and

dissemination of promotional materials, presentation of projects

results at conferences etc. for industry and DH Utilities

• Description and analysis of successful projects

• Heat delivery contract templates for projects that will facilitate

implementation of projects for potential clients and potential ESCo

companies that are interested in realization of ESCo projects involving

solar energy, seasonal storages and DH integration etc.




PITAGORAS as Door Opener for BIG

SOLAR in Graz – Concept developed




Thank you very much for yourattention

Thank YOU for your attention!

large solar thermal systems - celsius initiative...solar thermal concept • 10.000 m2 solar thermal...

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