SOLARGE

Hotel Delfin

Izola, Slovenia

Hotel, sports centre | 140 sqm installation

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Project summary · Technical description · Financing · Development · Downloads

Project Summary

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.



 


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


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


*) 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

 

 


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."

 

 


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


Operator

see Owner

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Technical description

 


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


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)

./.


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


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


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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Financing and investment

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.


 


Financing of the CSTS

Form of financing

Purchase

Distribution in percentage

0 %


Costs of solar materials

Total cost of solar system

not available


Operation costs of heating system

Increase of the operation cost after CSTS implementation

not available

 

 


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Development & experiences

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?

./.


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

 


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

Downloads

SOLARGE_goodpractice_si_hoteldelfin.pdf

this datasheet in printable PDF-format

833 K

hoteldelfin_scheme.pdf

the hydraulic scheme

48 K

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

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