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Izola, Slovenia
Hotel, sports centre | 140 sqm installation
+++ photo gallery +++
Data acquisition is still in process!
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Description The hotel owner is the “Slovenian Union of pensioners associations - Zveza društev upokojencev Slovenije”. Thus, visitors are mainly pensioners and swimming is their major sport activity. Hotel and solar system were built in 1980. The solar system (350 sqm2) was the biggest solar system in former Yugoslavia. In 2001, the hotel was renovated. The roof, sloped before, is flat now and supports four fields of solar collectors, which are designed exclusively for heating of salt water in indoor (250 m2, 355 m3, 24–25 °C, all year long) and outdoor swimming pool (555 m2, 722 m3, 26–27 °C, Apr.–Oct.). The solar system has three horizontal heat storages (5 m3 each) with integrated tube heat exchangers. They are connected to the compensation pool where fresh sea water is added and disinfected. They use oil burners for heating of building and tap water.
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Building
| Type of building | Hotel, sports centre
| Number of dwellings, floors | not available
| Year of construction | 1980/2001
| Total effective area (heated) | not available
| Hot tap water consumption (measured/estimated) | 50–60 m3/d
| Whole energy consumption for heating purpose after CSTS implementation | 4,350,000 kWh/a |
System engineering
| Year of construction of CSTS | 2001
| Type of collectors | Flat plate collectors
| Thermal power | 90 kWtherm.
| Aperture area of collectors*) | 128 m2 | Buffer storage | 15.0 m3 | Hot tap water storage | ./. m3 | Total capacity of boilers with energy source | 1,160 kW,
Heating oil
| Type of hot tap water heating | Centralised
| Type of heating system | Centralised
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Costs
| Total cost solar system | not available
| Cost of the CSTS/gross area of collectors | not available | Subsidies | 0 % |
Output
| Output of solar heat**) | not available
| Reduction of final energy***) | not available
| CO2-emissions avoided | not available
| Solar performance guarantee | No
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*) 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
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Dinko Jakac, maintenance staff:
|  "Very affordable bank credits in mid 80ies and a large number of clients in that time due the fact that state co financing the vacations of pensioners. Later, due to the renovation of the hotel, we want to preserve the “environmental friendly” reputation of the hotel."
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Owner
| Delfin Hotel ZDUS d.o.o
Jože Klun
Tomažičeva ul. 10
6310 Izola, Slovenia
Phone: +386 5 6607-000
Fax: +386 5 6607-420
delfin.recepcija(at)siol.net
www.hotel-delfin.si
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Operator
| see Owner | |
Description of the CSTS
| Year of construction of CSTS | 2001
| Thermal power | 90 kWtherm. | Gross area of collectors | 140 m2 | Aperture area of collectors | 128 m2 | Type of collectors | Flat plate collectors
| Type of assembly | On flat roof
| Orientation of collectors | South (0°) | Inclination angle to horizon | 40°
| Freezing protection | Glycol
| Overheating protection | Expansiion vessel
| Operation mode | High flow
| Use of CSTS for | Swimming pool heating
| Buffer storage | 15.0 m3 (3 × 5 m3) | Hot tap water storage | ./. m3 (system is used for swimming pool heating only) | Control of backup-system/CSTS | Separated 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 | not available | Specification (if necessary) | ./.
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Space heating system
| Type of heating system | Centralised
| Number of boilers | 2
| Total capacity (power output) of boilers | 1,160 kW | Capacity of each boiler (year of construction) | No. 1: 580 kW (1992)
No. 2: 580 kW (1992)
| Energy source | Heating oil
| Type of boiler system | Standard
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Type of operation
| Operator of the CSTS system | Self-operation
| CSTS monitoring | No
| Data accessible via internet | No
| Scientific monitoring & follow up | No
| Maintenance contract | No | Visualisation of the solar heat output | No
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Yield of CSTS plant
| Output of solar heat | not available
| Origin of data | ./.
| Measuring point | ./.
| Reduction of final energy | not available
| Origin of data | ./. | Solar performance guarantee | No |
Heat consumption
| Whole energy consumption for heating purposes after CSTS implementation | 4,350,000 kWh/a | Origin of data | Measured/bills
| Energy used for heating of | Hot tap water heating,
space heating, swimming pool heating
| Whole energy consumption for heating purposes before CSTS implementation | not available
| Total tap water consumption | not available
| Hot tap water consumption | 50–65 m3/d
| Hot tap water temperature | 60 °C | Cold water temperature | 10–15 °C | |
Summary
| The solar collectors are divided in four arrays, each with an aperture area of 32 m2. They are connected in parallel. Heated water-antifreeze solution flows through an integrated tube heat exchanger in all of the three heat storages. Heat storages have a total volume of 15 m3. Swimming pool water is heated in a compensation pool via an external heat exchanger. No heating of hot tap water with the solar system is provided.
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Introduction After the reconstruction of the Delfin hotel in the year 2001, they built the solar system once again, but the system is essentially smaller (128 m2 instead of 350 m2, new solar collectors). The main reason for rebuilding the solar system was not the economical benefits, but they attend to preserve the image of an environment friendly hotel. | 
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Financing of the CSTS
| Form of financing | Purchase
| Distribution in percentage | 0 % |
Costs of solar materials
| Total cost of solar system | not available
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Operation costs of heating system
| Increase of the operation cost after CSTS implementation | not available | | |
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Qualitative aspects of the CSTS | 
| Summary of experiences / Notices to the project performance
The solar system was built in 1980 with a solar collector area of 350 m2, it was the biggest solar system in former Yugoslavia at that time. In the year 2001, the hotel was renovated.
The roof, that was sloped, is flat now and supports four fields of solar collectors, which are designed exclusively for heating of salt water for internal (A = 250 m2, V = 355 m3, water temperature: 24–25 °C, in operation whole year) and external swimming pool (A = 555 m2, V = 722 m3, 26–27 °C, in operation from end of April to the middle of October). The solar system has three horizontal heat storages, each with a volume of 5 m3. The heat storages have integrated tube heat exchangers and they are connected to the compensation pool, where fresh sea water is added and disinfected. No calorimeters are installed now, but there is a plan to build a building management system (BMS) and solar systems will be connected as well. |
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 |
Experiences technical staff
| Experienced problems or failures? | Yes (occasionally: leakage of solar collector rubber pipes)
| Found solutions to these problems or failures? | Yes | |
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