SOLARGE

Terme Catez / Hotel Zusterna

Koper, Slovenia

Sports centre, hotel | 600 sqm installation

 


Project summary · Technical description · Financing · Development · Downloads

Project Summary

Description

This solar system is built at hotel Zusterna at the seaside. It is used for heating of an outdoor swimming pool and was installed during the renovation of the hotel in 2001. The whole roof of the indoor swimming pool is used as solar roof with unglazed solar collectors (600 sqm). The solar system operates, when the outdoor swimming pool is used (May–September). A buffer storage with a volume of 2 cbm is made by concrete and used for chemical preparation of pool water and for maintaining a constant level of water in the swimming pool as well. The cost of the solar collector was only 40,2 €/sqm due to the fact, that only additional cost for stainless steel piping and pump was paid. As absorbers large panel roof elements ared used and they are not representing any additional costs as the replacement of old roof should be made anyway.



 


Building

Type of building

Sports centre / hotel

Number of dwellings, floors

99 rooms
P+4 floors

Year of construction

2001 (renovated)

Total effective area (heated)

./. 

Hot tap water consumption (measured/estimated)

./.

Whole energy consumption for heating purpose after CSTS implementation

./.


System engineering

Year of construction of CSTS

2001

Type of collectors

Uncovered collectors

Thermal power

420 kWtherm.

Aperture area of collectors*)

600 m2

Buffer storage

2.0 m3

Hot tap water storage

./. 

Total capacity of boilers with energy source

./.
./.

Type of hot tap water heating

./.

Type of heating system

./.


Costs

Total cost solar system

24,100 Euro

Cost of the CSTS/gross area of collectors

40 Euro/m2

Subsidies

0 %


Output

Output of solar heat**)

99,000 kWh/a

Reduction of final energy***)

90,000 kWh/a

CO2-emissions avoided

25 t 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

 


 


Owner

Terme Catez d.d., Hotel Zusterna
Istrska 76
5000 Koper, Slovenia
Phone: +386 5 6100300
Fax: +386 5 6100308
www.terme-catez.si


Operator

see Owner

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Technical description

 


Description of the CSTS

Year of construction of CSTS

2001

Thermal power

420 kWtherm.

Gross area of collectors

600 m2

Aperture area of collectors

600 m2 

Type of collectors

Unglazed collectors

Type of assembly

Solar roof

Orientation of collectors

South-West (+35°)

Inclination angle to horizon

not available

Freezing protection

Drain-back

Overheating protection

None

Operation mode

High flow

Use of CSTS for

Swimming pool heating (outdoor)

Buffer storage

2.0 m3

Hot tap water storage

./.

Control of backup-system/CSTS

Separated control


Hot tap water system

Type of hot water heating

./.

Recirculation system

./.

For decentralised systems:
The installation on the consumer site

./.

Size of storage for hot tap water

./.

Specification (if necessary)

./.


Space heating system

Type of heating system

./.

Number of boilers

./.

Total capacity (power output) of boilers

./.

Capacity of each boiler (year of construction)

./.

Energy source

./.

Type of boiler system

./.


Type of operation

Operator of the CSTS system

not available

CSTS monitoring

not available

Data accessible via internet

not available

Scientific monitoring & follow up

Yes

Maintenance contract

not available

Visualisation of the solar heat output

No


Yield of CSTS plant

Output of solar heat

99,000 kWh/a

Origin of data

Design (TRNSYS)

Measuring point

Between collector and storage

Reduction of final energy

99,000 kWh/a

Origin of data

Estimated

Solar performance guarantee

No


Heat consumption

Whole energy consumption for heating purposes after CSTS implementation

./.

Origin of data

./.

Energy used for heating of

./.

Whole energy consumption for heating purposes before CSTS implementation

./.

Total tap water consumption

./.

Hot tap water consumption

./.

Hot tap water temperature

./.

Cold water temperature

./.

 

 


Summary

The solar system is used for outdoor swimming pool heating and it is used only during the warm period of the year. The water in the solar collector flows into the open concrete buffer storage where it is chemical treated and then flows into the swimming pool. No heat exchanger and expansion vessels are used. During the cold period the water as heat carrier is drained down.


 


Engineering company

Makro 5
Uros Venturini
Kidriceva 46
Slovenia
Phone: +386 5 6635555
Fax: +386 5 6635550
www.makro5.com


Producer

TRIMO d.d.
Silvo Stih
Prijateljeva 12
8210 Trebnje, Slovenia
Phone: +386 7 3460356
Fax: +386 7 3460337
Silvo.stih(at)trimo.si
www.trimo.si

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Financing and investment

Introduction

The renovation of the hotel included the replacement of the roof upon the indoor swimming pool. Large thermal insulated panels were selected as roofing. According to the previous research and collaboration between the University of Ljubljana and a producer of large panel roof elements the upgrading of such elements into uncovered solar collectors was proposed and accepted. The only designed criteria was total sum of investments (< 24,000 €). Investment was made by 100 % self financing.


 


Financing of the CSTS

Form of financing

Purchase

Distribution in percentage

0 %


Costs of solar materials

Total cost of solar system

24,100 Euro


Operation costs of heating system

Increase of the operation cost after CSTS implementation

not available

 

 


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Development & experiences

 


Experiences management

Experienced problems or failures?

not available

Found solutions to these problems or failures?

not available


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?

not available

Found solutions to these problems or failures?

not available

 

Summary of experiences / Notices to the project performance

The only design criteria was the total sum of investments (< 24,000 €).

The solar system serves the demand most of the time. During hot summer days the system is casually switched off because the pool water would get too warm.

The testing of prototype was done at the University of Ljubljana. Using wind dependant efficiency curves, the TRNSYS simulation were performed and delivered energy established.


Installer

TRIMO d.d.
Silvo Stih
Prijateljeva 12
8210 Trebnje, Slovenia
Phone: +386 7 3460356
Fax: +386 7 3460337
Silvo.stih(at)trimo.si
www.trimo.si

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

Downloads

SOLARGE_goodpractice_si_termecatiz.pdf

this datasheet in printable PDF-format

734 K

Hotel-Zusterna_scheme.pdf

the hydraulic scheme

33 K