SOLARGE

Pracatinat

Fenestrelle (TO), Italy

Educational centre | 150 sqm installation

 


Project summary · Technical description · Financing · Development · Downloads

Project Summary

Description

Consorzio Pracatinat is an environmental education centre, namely a hotel for groups of students and offering environmental education activities. Up to 200 guests can be hosted at once.
In 2004 a 140 sqm flat plate solar plant was installed on the flat roof of the hotel, providing heat for hot tap water.
The plant is one of three systems financed by the Province of Turin to show that the large scale solar thermal technology is mature for the market.
The collector field is made of large scale modules (10 sqm each), which were fixed on top of the building without perforating the roof.
Due to the low efficiency of the existing auxiliary heating system, the fuel saving is very high.



 


Building

Type of building

Educational centre

Number of users/floors

200 users,
56 dwellings
4 floors

Year of construction

1929

Total effective area (heated)

3,200 m2

Hot tap water consumption (measured/estimated)

3,500 m3/a (calculated)

Whole energy consumption for heating purpose after CSTS implementation

176,000 kWh/a


System engineering

Year of construction of CSTS

2004

Type of collectors

Flat plate collectors

Thermal power

100 kWtherm.

Aperture area of collectors*)

142 m2

Buffer storage

5.0 m3

Hot tap water storage

7.5 m3

Total capacity of boilers with energy source

2,358 kW, natural gas

Type of hot tap water heating

Centralised

Type of heating system

Centralised


Costs

Total cost solar system

90,000 Euro

Cost of the CSTS/gross area of collectors

600 Euro/m2

Subsidies

40 %


Output

Output of solar heat**)

99,000 kWh/a

Reduction of final energy***)

180,000 kWh/a

CO2-emissions avoided

41.4 t CO2/a

Solar performance guarantee

No


*) Aperture area = light transmitting area of the front glass
**) measured, between storage and piping to taps (solar system output)
***) related to the measured output mentioned before

 

 


Boris Zobel, director of Pracatinat:

„The educational centre Consorzio Pracatinat is specialised in environmental education activities, sustainable tourism and accompaniment of local sustainable development processes. Therefore, it has a natural inclination to renewable technologies. This is clearly testified by the decision to install a solar thermal pilot plant, which contributes to create an environmentalist image of the centre. Furthermore, a display is mounted in the hall of the building to show the performance of the solar system.“

 

 


Owner and operator

Consorzio Pracatinat
Claudio Richiardone
località Prà Catinat
Fenestrelle (TO), Italy
Phone: +39 121 884807
Fax: +39 121 83711
c.richiardone(at)pracatinat.it
www.pracatinat.it

Top of page Project summary · Technical description · Financing · Development · Downloads

Technical description

 


Description of the CSTS

Year of construction of CSTS

2004

Thermal power

100 kWtherm.

Gross area of collectors

150 m2

Aperture area of collectors

142 m2

Type of collectors

Flat plate collectors

Type of assembly

On flat roof

Orientation of collectors

South (0°)

Inclination angle to horizon

30°

Freezing protection

Glycol

Overheating protection

Expansion vessel

Operation mode

Low flow

Use of CSTS for

Hot tap water heating

Buffer storage

5.0 m3

Hot tap water storage

7.5 m3

Control of backup-system/CSTS

Separated control


Hot tap water system

Type of hot water heating

Centralised

Recirculation system

Yes

For decentralised systems:
The installation on the consumer site

./.

Size of storage for hot tap water

7.5 m3

Specification (if necessary)

Central


Space heating system

Type of heating system

Centralised

Number of boilers

3

Total capacity (power output) of boilers

1,980 kW

Capacity of each boiler (year of construction)

all: 660 kW (1999)

Energy source

Natural gas

Type of boiler system

Standard


Type of operation

Operator of the CSTS system

Self-operation

CSTS monitoring

Yes: output of solar heat, total water consumption, heat demand of recirculation system

Data accessible via internet

Yes

Scientific monitoring & follow up

No

Maintenance contract

Yes

Visualisation of the solar heat output

Yes: a display showing the solar gain of the collectors, the temperature in the collectors and in the buffer storage is installed in the entrance of the building.


Yield of CSTS plant

Output of solar heat

99,000 kWh/a

Origin of data

Design (Calculated)

Measuring point

Between collector and storage
(collector output)

Reduction of final energy

180,000 kWh/a (due to low efficiency of back-up heating system)

Origin of data

calculated

Solar performance guarantee

No


Heat consumption

Whole energy consumption for heating purposes after CSTS implementation

176,000 kWh/a

Origin of data

Estimated

Energy used for

Hot tap water heating

Whole energy consumption for heating purposes before CSTS implementation

176,000 kWh/a

Total tap water consumption

7,000 m3/a

Hot tap water consumption

3,500 m3/a

Hot tap water temperature

50 °C

Cold water temperature

8/12 °C

 

 


Summary

The collectors are connected with a 5 cbm buffer storage, which heats up via heat exchanger one of the three hot tap water tanks. The other two tanks are connected in parallel and are heated up by both, the solar tank and the auxiliary heating boiler.
The recirculation circuit can be deviated either to the solar tank (in the summer), or to the other two tanks (in the winter), in order to optimise the efficiency of the system.





 


Manufacturer of collectors

Teufel & Schwarz GmbH
Achenweg 3
6353 Going, Austria
Tel.: +43 (0) 53 58/3939-0
Fax: +43 (0) 53 58/3900
info(at)teufel-schwarz.com
www.teufel-schwarz.com


Planner

TStudio Prodim
c.so Re Umberto, 146
Torino, Italy
Phone: +39 011 3199231


Supplier of collectors

Ecojoule s.r.l.
via Cibrario, 6
Torino, Italy
Phone: +39 011 473 1753
Fax: +39 011 437 4856
info(at)ecojoule.it
www.ecojoule.it

 

Top of page Project summary · Technical description · Financing · Development · Downloads

Financing and investment

Introduction

The plant was partly financed by the Province of Turin in the framework of a demonstration programme. Since the collectors were installed on a flat roof, a mounting structure was necessary, which raised the cost of the collector field.


 


Financing of the CSTS

Form of financing

Purchase

Distribution in percentage

40 %


Costs of solar materials

Total cost of solar system

90,000 Euro
(excl. VAT)

Detailed costs for

Collectors

55,000 Euro

Elevation/mounting structure

included

Storage, heat exchanger

8,000 Euro

Back-up heater

./.

Control

4,000 Euro

Installation

not available

Planning/Engineering

19,000 Euro


Operation costs of heating system

Total operation cost

not available

or: Increase of the operation cost after CSTS implementation

not available

 

 

Special note for subsidy systems in the partner country

The Province of Turin subsidised a part of the total investment costs in a demonstration programme (grants).

 

 

Top of page Project summary · Technical description · Financing · Development · Downloads

Development & experiences

 

Is the investment profitable?

Due to the temporary low efficiency of the system, the investment is not yet profitable. Small modifications of the plant, however, shall be enough to improve the energetic and economic efficiency.


Does the realised solution accurately serve the demand?

This project shows the importance of the low flow technology in large scale solar plants.

 


Experiences management

Experienced problems or failures?

Yes: the efficiency of the system is lower than expected due to the high temperatures of the auxiliary heating plant.

Found solutions to these problems or failures?

Yes


Financial effects / project performance

Project economically efficient?

not available

Fiscal or other financial effects?

not available

Effects on rental fees?

not available


Experiences technical staff

Experienced problems or failures?

not available

Found solutions to these problems or failures?

not available

 

 

What initiated the installation of the CSTS?

The subsidies of the Province of Turin initiated the decisional process to buy a large scale solar plant.


Course of planning and installing

Our application was evaluated and finally our hotel was chosen for the installation of a pilot plant. The technical staff was supported by experts in the planning and in the choice of suppliers.


Recommendation for the realisation of future projects

Before the decision to install a pilot plant, it should be assured that all involved actors are informed and share the same opinion. Otherwise it will be difficult to coordinate all actors, such as the owner, the planner and the responsible for monitoring.


Top of page Project summary · Technical description · Financing · Development · Downloads

Downloads

SOLARGE_goodpractice_it_pracatinat.pdf

this datasheet in printable PDF-format

807 K

Pracatinat_scheme.pdf

the hydraulic scheme (detailed)

168 K