Foresteria INFN

Frascati (Roma), Italy

Guestrooms | 196 sqm installation



The present assessment deals with a solar thermal system for domestic hot water preparation to be installed on the guestrooms of INFN’s scientific laboratories.
A 112 kWth collector field has been proposed, covering 70 % of the total heat load for DHW and reducing CO2 emissions by 31 t/a.
The decision to install a solar plant started with the interest of INFN for new technologies and was enhanced by the SOLARGE campaign in the Province of Rome, which provided scientific support, including building stock assessments.



Type of building


Number of dwellings, floors

28 beds
600 lunchs/day

Year of construction


Total effective area (heated)

not available 

Hot tap water consumption

not available

Whole energy consumption for heating purpose (present situation)

139,600 kWh/a

Proposed CSTS (main variant)

Type of collectors

Flat plate collectors

Thermal power

112 kWtherm.

Aperture area of collectors*)

196 m2

Buffer storage

5.0 m3

Hot tap water storage

2.5 m3

Total capacity of boilers

150 kW

Type of hot tap water heating


Type of heating system


Estimated Costs

Total cost solar system

191,000 Euro

Cost of the CSTS/gross area of collectors

837 Euro/m2

Available Subsidies

55 %

Predicted System Output

Output of solar heat

101,000 kWh/a

Reduction of final energy

134,500 kWh/a

CO2-emissions avoided

30.9 t CO2/a

*) Aperture area = light transmitting area of the front glass


Proposed System Scheme



INFN – Laboratori nazionali di Frascati
Frascati (Roma)

Assessment by

Reseda Onlus
Via Lombardia 19
00045 Genzano di Roma, Italy
Phone: 0039-06-9364170



This assessment summary (English)

328 K


Detailed assessment report, 10 pages (Italian)

243 K