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Calimera (LE), Italy
Elderly house | 52 sqm installation
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Description
The existing system was already preset for solar thermal integration. Besides, the constant thermal load of elderly houses fits very well to this technology. Finally, high subsidies by the Region of Puglia were available. The boundary conditions were obviously very suitable for the installation of a solar thermal plant: the system provides heat for domestic hot water preparation and has been realised with heat pipe vacuum tube collectors. |  |
Building
| Type of building | Elderly house
| Number of users / dwellings, floors | 53 + 25 users
28 rooms
3 floors
| Year of construction | 2006
| Total effective area (heated) | 700 m2 | Hot tap water consumption (measured/estimated) | not available
| Whole energy consumption for heating purpose after CSTS implementation | 42,190 kWh/a |
System engineering
| Year of construction of CSTS | 2007
| Type of collectors | Vacuum tube collectors
| Thermal power | 24 kWtherm.
| Aperture area of collectors*) | 34 m2 | Buffer storage | ./. | Hot tap water storage | 2 m3 | Total capacity of boilers with energy source | (25 + x) kW, natural gas + electricity (heat pump)
| Type of hot tap water heating | Centralised
| Type of heating system | Centralised
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Costs
| Total cost solar system | 38,000 Euro | Cost of the CSTS / gross area of collectors | 732 Euro/m2 | Subsidies | 40 % |
Output
| Output of solar heat**) | 31,970 kWh/a | Reduction of final energy***) | 31,970 kWh/a | CO2-emissions avoided | 7.3 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 | |
Geom. Francesco Corlianò, Amm. ATHENA s.r.l.:
| "It is strongly necessary to implement projects for promoting solar thermal technology, which has enormous benefits.
Hopefully, incentive mechanisms will be simplified and accelerated.
It is crucial to train technicians, since a good plant design is the basis for energy and economic savings."
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Owner
| ATHENA s.r.l.
geom. Francesco Corlianò
Via Salvo d’Acquisto, 25
73021 Calimera (LE), Italy
Phone: +39 832 873505
Fax: +39 832 873505
f.corliano(at)athenaservizi.it
www.athenaservizi.it |
Operator
| See owner | |
Description of the CSTS
| Year of construction of CSTS | 2007
| Thermal power | 24 kWtherm. | Gross area of collectors | 52 m2 | Aperture area of collectors | 33.8 m2 | Type of collectors | Vacuum tube collectors
| Type of assembly | On flat roof
| Orientation of collectors | South (0°) | Inclination angle to horizon | 45°
| Freezing protection | Glycol
| Overheating protection | Expansion vessel
| Operation mode | High-flow
| Use of CSTS for | Hot tap water heating
| Buffer storage | ./.
| Hot tap water storage | 2 m3 (2 × 1 m3) | Control of backup-system / CSTS | Shared control
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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 | 2 m3 | Specification (if necessary) | ./.
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Space heating system
| Type of heating system | Centralised
| Number of boilers | not available
| Total capacity (power output) of boilers | not available | Capacity of each boiler (year of construction) | not available
| Energy source | Electricity (heat pump)
| Type of boiler system | ./.
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Type of operation
| Operator of the CSTS system | Self-operation
| CSTS monitoring | No
| Data accessible via internet | ./.
| Scientific monitoring / follow up | not available | Maintenance contract | No
| Visualisation of the solar heat output | No
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Yield of CSTS plant
| Output of solar heat | 31,970 kWh/a | Origin of data | Design (calculated)
| Measuring point | Between storage and piping to taps
| Reduction of final energy | 31,970 kWh/a | Origin of data | Software simulation
| Solar performance guarantee | No
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Heat consumption
| Whole energy consumption for heating purposes after CSTS implementation | 42,190 kWh/a
(for DHW)
| Origin of data | Design (calculated)
| Energy used for | Hot tap water heating
| Whole energy consumption for heating purposes before CSTS implementation | 42,190 kWh/a
| Total tap water consumption | not available | Hot tap water consumption | 912 m3/a | Hot tap water temperature | 50 °C | Cold water temperature | 8–12 °C | |
Summary
| The collector field of this pump driven system for DHW preparation is divided into two sub-fields, which are connected in series.
The control system operates both, the solar and the conventional plant.
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 Click image for larger view!
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Planning/Engineering
| Studio Tecnico PROGRES
Ing. Antonio De Giorgi
via Savoia, 23
Galatone (Le), Italy
Phone: +39 333 4430162
Fax: +39 833 865927
a_degiorgi(at)libero.it
www.studioprogres.it |
Installer
| Ditta Giorgio Impianti
Giorgio Pispico
via Enrico Toti, 21
Matino (Le), Italy
Phone: +39 333 9464255
Fax: +39 833 503539
info(at)giorgioimpianti.it
www.giorgioimpianti.it |
Producer of the CSTS
| CMG Solari di Giannelli Mario
Giorgio Pispico
via Monte Rosa, 14
Melissano (Le), Italy
Phone: +39 833 581428
Fax: +39 833 581428
info(at)cmgsolari.it
www.cmgsolari.it | |
Introduction
Despite low gas prices, yearly savings of about 2,000 Euro are expected. The simple pay back time is estimated to be about eleven years, but does not include increase of energy costs and the benefits concerning amortisation. The investor decided to purchase evacuated tube collectors, although this technology was not strictly necessary for this kind of application.
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Financing of the CSTS
| Form of financing | Purchase
| Distribution in percentage | 40 % |
Costs of solar materials
| Total cost of solar system | 38,000 Euro | Detailed costs for
| | Collectors (incl. mounting structure)
| 20,000 Euro | 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
| not available |
Operation costs of heating system
| Increase of the operation cost after CSTS implementation | not available | |
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Qualitative aspects of the CSTS The decision was based on the will to install modern plants. This was made easier by the availability of regional subsidies. The management of the elderly house is satisfied with the solar system's performance. It is recommendable to carefully evaluate the choice between flat plate and vacuum tube collectors, especially according to the local climate and the kind of energy load.
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Experiences management
| Experienced problems or failures? | No
| Found solutions to these problems or failures? | ./.
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Financial effects / project performance
| Project economically efficient? | Yes
| Fiscal or other financial effects? | No
| Effects on rental fees? | No
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Experiences technical staff
| Experienced problems or failures? | No
| Found solutions to these problems or failures? | ./. | |
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