SOLARGE

Telesun

Verona, Italy

Multi family house | 370 sqm installation

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Project summary Technical description Financing Development Downloads

Project Summary

Description
The project was financed in the framework of a regional subsidy program for solar thermal systems and autonomous heat accounting (D.G.R. n1911, 30.06.2000)
The plant was installed on six existing buildings in Saval, Verona. Each building has nine levels.
A new technical room was built for the solar thermal plants components.
The flate plate collectors are installed on roof pitches facing south and produce heat for domestic hot water preparation.
The monitoring equipement calculates the produced solar heat and the total energy need.


 


Building

Type of building

Multi family house

Number of users / dwellings, floors

522 users,
242 dwellings,
9 floors

Year of construction

2003

Total effective area (heated)

21,030 m2

Hot tap water consumption (measured/estimated)

15,964 m3/a
(calculated)

Whole energy consumption for heating purpose after CSTS implementation

750,000 kWh/a


System engineering

Year of construction of CSTS

2003

Type of collectors

Flat plate collectors

Thermal power

230 kWtherm.

Aperture area of collectors*)

331 m2

Buffer storage

12 m3

Hot tap water storage

./.

Total capacity of boilers with energy source

200 kW, district heating

Type of hot tap water heating

Centralised

Type of heating system

Centralised


Costs

Total cost solar system

591,623 Euro
(290,156 Euro) 1)

Cost of the CSTS / gross area of collectors

1,600 Euro/m2
(784 Euro/m2) 1)

Subsidies

23.8 %

1) see Financing + Investment for details


Output

Output of solar heat**)

233,000 kWh/a

Reduction of final energy***)

233,000 kWh/a

CO2-emissions avoided

63 t CO2/a

Solar performance guarantee

*) 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

 

 


Ing. Tiziano Pompele, AGEC - Verona, Technical Director:

"Both expected results have been reached:
heating costs reduction of social housing
reduction of CO2 emissions through adoption of renewable energies.
A solar fraction of 30 % was reached, corresponding to about 690 kWh per apartment."

 

 


Owner

AGEC - Azienda Gestione Edifici Comunali - Verona
Ing. Tiziano Pompele
Via Enrico Noris, 1
Verona, Italia
Phone: +39 45 8051311
Fax: +39 45 8013744
tiziano.pompele(at)agec.it
www.agec.it


Operator

See owner

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Technical description

 


Description of the CSTS

Year of construction of CSTS

2003

Thermal power

230 kWtherm.

Gross area of collectors

370 m2

Aperture area of collectors

331 m2 

Type of collectors

Flat plate collectors

Type of assembly

On roof top

Orientation of collectors

South (0)

Inclination angle to horizon

19

Freezing protection

Glycol

Overheating protection

Expansion vessel

Operation mode

Variable

Use of CSTS for

Hot tap water heating

Buffer storage

12 m3

Hot tap water storage

./.
No hot tap water storage is needed. Heat is provided by the local district heating network via heat exchanger.
 

Control of backup-system / CSTS

Shared 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

./.
No hot tap water storage is needed. Heat is provided by the local district heating network via heat exchanger. 

Specification (if necessary)


Space heating system

Type of heating system

Centralised

Number of boilers

1

Total capacity (power output) of boilers

200 kW

Capacity of each boiler (year of construction)

No. 1: 200 kW (1980)

Energy source

District heating

Type of boiler system

./.


Type of operation

Operator of the CSTS system

external maintenance

CSTS monitoring

Yes: solar radiation, output of solar heat, total water consumption, temperature in storages and fluid temperature (system is remotely controlled). The maintenance company is also responsible for the monitoring.

Data accessible via internet

No

Scientific monitoring / follow up

No

Maintenance contract

Yes: ordinary maintenance once a month

Visualisation of the solar heat output

No


Yield of CSTS plant

Output of solar heat

233,000 kWh/a

Origin of data

Measured

Measuring point

Between storage and piping to taps

Reduction of final energy

233,000 kWh/a

Origin of data

assumed as before

Solar performance guarantee

No


Heat consumption

Whole energy consumption for heating purposes after CSTS implementation

750,000 kWh/a

Origin of data

Measured (by AGEC)

Energy used for

Hot tap water heating

Whole energy consumption for heating purposes before CSTS implementation

./.

Total tap water consumption

not available

Hot tap water consumption

15,964 m3/a

Hot tap water temperature

52.5 C

Cold water temperature

12.0 C

 

 


Summary

The solar thermal system integrates the existing heating systems, which is operated by the local district heating network.



 

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Financing and investment

 


Financing of the CSTS

Form of financing

Purchase,
76.2 % self-financing

Distribution in percentage

23.8 %


Costs of solar materials

Total cost of solar system

591,623.20 Euro

Detailed costs for


Collectors

not available

Elevation / mounting structure

not available

Storage / heat exchanger

not available

Backup heater

not available

Control

not available

Installation

not available

Planning / Engineering

not available

Others:
The total costs include costs which are not directly connected with the solar system (e.g. for security, for construction of new technical room) for a total amount of:

301,466.89


Operation costs of heating system

Increase of the operation cost after CSTS implementation

not available

 




The plant was partly financed by the Region: 141,000 EUR (based on solar thermal plant's + other measures' costs). This equals 23.8 % of the total costs.
Costs for the solar system without additional costs sum up to 290,156.31 EUR.

 


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Development & experiences

Qualitative aspects of the CSTS
The project was initiated by the availability of subsidies for renewable heating plants. Besides, this pilot project was meant as an opportunity to increase the internal know-how for future applications.

The planning and installing course was as foreseen. A crucial point was the security of the workers in the roofs.

The plant is working as planned.


Summary of experiences / Notices to the project performance
The system's performance is satisfactory. The solar plant covers 100 % of the energy demand in the summer. During district heating network's maintenance periods, for instance, domestic hot water delivery was not interrupted, as would have happened without the solar system.

 


Experiences management

Experienced problems or failures?

No

Found solutions to these problems or failures?

./.


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?

see above

Found solutions to these problems or failures?

see above

 


According to the available budget and tp the system's size, we recommend to install an accurate monitoring equipement to properly analyze the plant's performance.

This experience was of huge importance because we gained experience in designing, installing, operating and maintaining custom built solar plants. Due to the recent national legislation, which introduced mandatory renewable measures, this experience will be very useful in the near future.
Based on the data operation of this large system, other existing, smaller solar plants have been improved.

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