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 kW_therm.
Aperture area of collectors*)	600 m^₂
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
CO_2-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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Project summary · Technical description · Financing · Development · Downloads

Technical description

Description of the CSTS
Year of construction of CSTS	2001
Thermal power	420 kW_therm.
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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Project summary · Technical description · Financing · Development · Downloads

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

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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