SOLARGE

Župnijska cerkev Sv. Petra in Sv. Pavla

Zagorje ob Savi, Slovenia

Church | 34 sqm installation

+++ photo gallery +++

 


Project summary · Technical description · Financing · Development · Downloads

Project Summary

Description

Parish church in Zagorje ob Savi was build in 1874, mainly from the stones. Because of static problems the renovation began in the year 2000. Besides others the renovation includes the protection of constructions and interior, which were in bad conditions due to the high content of water in the constructions and high air humidity. According to the good experience with low temperature walls heating in the church in Mokronog (in SE part of Slovenia) the same system was chosen. Tubes were installed in outer walls up to 80 cm over the floor level. Solar system consists of 32 m2 of vacuum flat solar collectors and a 2 m3 heat storage. In parallel to the solar system, a gas boiler is installed. The system is used only for heating of the church and it operates through the whole year while back-up gas boiler operates only from the end of October to the March.

 





 


Building

Type of building

Church

Number of users / dwellings, floors

./.

Year of construction

1874 (2000–2005)

Total effective area (heated)

./.

Hot tap water consumption (measured/estimated)

./.

Whole energy consumption for heating purpose after CSTS implementation

60,500 kWh/a


System engineering

Year of construction of CSTS

2002

Type of collectors

Flat vacuum collectors with vacuum pump

Thermal power

22 kWtherm.

Aperture area of collectors*)

32 m2

Buffer storage

2 m3

Hot tap water storage

./.

Total capacity of boilers with energy source

39 kW,

Type of hot tap water heating

./.

Type of heating system

Centralised


Costs

Total cost solar system

14,500 Euro

Cost of the CSTS / gross area of collectors

422 Euro/m2

Subsidies

0 %


Output

Output of solar heat**)

not yet available

Reduction of final energy***)

not yet available

CO2-emissions avoided

./.

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

 

 


Mr. Matjaž Križnar, priest at Župnijska cerkev Sv. Petra in Sv. Pavla:

"The combination of low temperature heating and solar heating enables great advantages compared to other systems. The system efficiently improves indoor conditions, protects the interior and runs from March to November without any additional cost. Although the exact amount of heat collected with solar system is unknown, the consumption of energy for heating the church is much lower then in other comparable churches. Such systems can be multiplied in number of other churches."

 

 


Owner

Roman Catholic Church, Parish church
Župnijska cerkev Sv. Petra in Sv. Pavla
G. Matjaž Križnar
Cankarjev trg 3
1410 Zagorje, Slovenia
Phone: +386 31 689970
Matjaz.kriznar(at)rkc.si


Operator

See owner

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Technical description

 


Description of the CSTS

Year of construction of CSTS

2002

Thermal power

22.4 kWtherm.

Gross area of collectors

34.4 m2

Aperture area of collectors

32.0 m2 

Type of collectors

Flat vacuum collectors with vacuum pump

Type of assembly

Roof top

Orientation of collectors

South (0°)

Inclination angle to horizon

32 °

Freezing protection

Glycol

Overheating protection

Expansion vessel

Operation mode

High flow

Use of CSTS for

Thermal activation of the walls and heating of the church

Buffer storage

2.0 m3 (one storage tank)

Hot tap water storage

./. (heating system only)

Control of backup-system / CSTS

Separated control


Hot tap water system

Type of hot water heating

Hot tap water is not

Recirculation system

provided in this object.

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

Centralised

Number of boilers

1

Total capacity (power output) of boilers

39 kW

Capacity of each boiler (year of construction)

No. 1: 39 kW (2002)

Energy source

Natural gas

Type of boiler system

Low temperature


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

Yes: once a year

Visualisation of the solar heat output

No


Yield of CSTS plant

Output of solar heat

not yet available

Origin of data

./.

Measuring point

./.

Reduction of final energy

The church was not heated before restoration

Origin of data

./.

Solar performance guarantee

No


Heat consumption

Whole energy consumption for heating purposes after CSTS implementation

60,500 kWh/a

Origin of data

Measured

Energy used for

Space heating

Whole energy consumption for heating purposes before CSTS implementation

The church was not heated before restoration

Total tap water consumption

0 m3/a

Hot tap water consumption

0 m3/a

Hot tap water temperature

./.

Cold water temperature

./.

 

 


Summary

Solar system is used for thermal activation of church walls through the whole year. It consist of a 32 m2 large field of solar collectors. A plate heat exchanger is installed between solar collectors and heat storage with a volume of 2 m3. The gas boiler is connected parallel to the heat storage and it is used only between the end of October till March. Parallel tubes are built in outer walls up to 80 cm above the floor. 40 tube loops are used, divided in 4 groups.

The main advantages of thermal activation of outer walls are: no problems with wet constructions, protection of paintings and wood interior and much better indoor environment.



 



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Financing and investment

Introduction

The heating and the solar systems were financed by many individual donators and they were build during the urgent renovation process. Therefore the costs of the bought systems were lower because no additional investments for installing the systems in the building were needed.


 


Financing of the CSTS

Form of financing

Purchase

Distribution in percentage

0 %


Costs of solar materials

Total cost of solar system

14.500 Euro

Detailed costs

not available


Operation costs of heating system

Or:
Increase of the operation cost after CSTS implementation

not available

 

 

 



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Development & experiences


Summary of experiences / Notices to the project performance

The combination of low temperature heating and solar heating enables great advantages compared to other systems. The system efficiently improves indoor conditions, protects the interior and runs between March and November without any additional cost. Although the exact amount of heat collected with solar system is unknown, the consumption of energy for heating the church is much lower then in other comparable churches. Such system can be multiplied in a number of other churches.

 


Experiences management

Experienced problems or failures?

Yes: once per year (at the start of the heating season) the vacuum pump must be used for reducing the pressure in flat solar collectors; during the summer the pressure is higher, but this is some kind of additional overheating protection.

Found solutions to these problems or failures?

Yes


Financial effects / project performance

Project economically efficient?

Yes

Fiscal or other financial effects?

not available

Effects on rental fees?

No


Experiences technical staff

Experienced problems or failures?

not available

Found solutions to these problems or failures?

not available

 

 




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

Downloads

SOLARGE_goodpractice_si_zupnijskacerkev.pdf

this datasheet in printable PDF-format

1.0 M

zupnijska_scheme.pdf

the hydraulic scheme

71 K

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

Photo gallery







(1) Church Sv. Petra in Sv. Pavla, Zagorje ob Savi, (2) High altar, (3) Solar collectors with aperture area of 32 sqm, oriented to the South, (4) Solar collector pump and solar loop plate heat exchanger, (5) Heat storage with a volume of 2 cbm in the cellar beneath the boiler room, (6) Heating pipes are built in outer walls up to 80 cm above the floor