SOLARGE

Technology centre Špan

Brezovica pri Ljubljani, Slovenia

Car centre with coffee house | 44 sqm installation

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Project summary · Technical description · Financing · Development · Downloads

Project Summary

Description

Špan d.o.o. is a family company that is working in vulcanizing business for 25 years. In 2005 they have expanded their business also in car selling, technical inspections and car washing. For this they have built the new centre with total ground area of 3,000 sqm. The new centre includes several buildings, all of them are build according to the low-energy standards. Great emphases were put into environmental friendly technologies: they use only LG, electrical transportation vehicles and high effectively (75 %) recycling of waste water from carwash devices. To those technologies they have also added solar system with vacuum solar collectors, which are placed on the flat roof of office building. Solar system is used for preparing hot water, floor heating in a coffeehouse and heating the technological water in carwash department.

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Office building and motor show department

 


Building

Type of building

Car centre with coffee house

Number of dwellings, floors

P, P+2 floors

Year of construction

2005

Total effective area (heated)

3,000 m2

Hot tap water consumption (measured/estimated)

3 m3/d !
(measured)

Whole energy consumption for heating purpose after CSTS implementation

not yet available


System engineering

Year of construction of CSTS

2005

Type of collectors

Vacuum tube collectors

Thermal power

20 kWtherm.

Aperture area of collectors*)

28.2 m2

Buffer storage

1.5 m3

Hot tap water storage

1.0 m3

Total capacity of boilers with energy source

240 kW
(liquid gas)

Type of hot tap water heating

Centralised

Type of heating system

Centralised


Costs

Total cost solar system

45,800 Euro

Cost of the CSTS/gross area of collectors

1,053 Euro/m2

Subsidies

0 %


Output

Output of solar heat**)

18,890 kWh/a

Reduction of final energy***)

28,730 kWh/a

CO2-emissions avoided

5.4 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

 

 


Mr. Ludvik Špan, Director Špan d.o.o.:

„Špan company is constantly growing for 25 years now, always concerned for the environment protection. Our experiences are so good that we suggest to all, especially large consumers of hot sanitary and technological water, to build a solar system.
Unfortunately in 2005 there were no governmental subsidies available, as it was a practice before, so we have built the system exclusively by our own means.“

 

 


Owner and operator

Špan d.o.o.
Mr. Ludvik Špan
Tržaška 537
1351 Brezovica pri Ljubljani, Slovenia
+386 1 365 8110
+386 1 365 8122
span(at)siol.net
www.span.si

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Technical description

 


Description of the CSTS

Year of construction of CSTS

2005

Thermal power

20 kWtherm.

Gross area of collectors

43.5 m2

Aperture area of collectors

28.2 m2 

Type of collectors

Vacuum tube collectors

Type of assembly

On flat roof

Orientation of collectors

South (0°), South-West (15°)

Inclination angle to horizon

45°

Freezing protection

Glycol, drain-back

Overheating protection

Drain-back

Operation mode

Variable

Use of CSTS for

Hot tap water heating, space heating

Buffer storage

1.5 m3
Buffer storage is connected with heat exchanger in back-up storage, directly with heating systems register enables the floor heating of coffeehouse and offices.

Hot tap water storage

1.0 m3
Back-up heat storage is heated indirectly by solar system and gas boilers. Once per day the water is heated up to 60°C including recirculation pipeline.

Control of backup-system/CSTS

Separated control / shared control. Controls for heating, cooling and solar system are made as modular unit. Connection with BMS in 2006.


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

1.5 m3

Specification (if necessary)

./.


Space heating system

Type of heating system

Centralised

Number of boilers

4

Total capacity (power output) of boilers

1.5 kW

Capacity of each boiler (year of construction)

all: 60 kW (2005)

Energy source

Liquid gas

Type of boiler system

Condensing


Type of operation

Operator of the CSTS system

Self-operation (without intervention from the staff)

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

18,890 kWh/a

Origin of data

Design (calculated)

Measuring point

not available

Reduction of final energy

28,730 kWh/a

Origin of data

Design (calculated)

Solar performance guarantee

No


Heat consumption

Whole energy consumption for heating purposes after CSTS implementation

not yet available

Origin of data

./.

Energy used for heating of

Hot tap water heating, space heating and car wash

Whole energy consumption for heating purposes before CSTS implementation

./.
(building is new)

Total tap water consumption

10 m3/d !

Hot tap water consumption

3 m3/d !

Hot tap water temperature

58–60 °C

Cold water temperature

10–12­ °C

 

 


Summary

The solar system that is used for preparing hot water, heating of a coffeehouse and heating the technological water in the carwash consists of ten units of vacuum solar collectors with heat pipes (30 pipes in one unit). The units are connected in series, flow of heat transfer fluid is variable and depending of the temperature on collectors output. Heat is transferred by a mixture of water and antifreeze, regardless that the system has a half-open expansion unit, to which the heat carrier is draining down. Heat produced by solar col­lectors is transferred first into the back-up tank (1.0 cbm), after that in the solar storage (1.5 cbm). In case that temperature of the water in the solar heat storage is adequate for heating, heat is transferred to heating systems distribution register and into the floor heating system in the coffeehouse.

Hydraulic scheme (click to enlarge)

 

 

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Financing and investment

Introduction

The system was paid by the investor. The final price of the system was 1,053 EUR per m2 of solar collectors. Only one third of this was the price of solar collectors due to high quality of installed elements and rather complex configuration of the system. Unfortunately in the year 2005 the subsidies for solar systems financed by legal persons were not available on the contrary to the previous year.


 


Financing of the CSTS

Form of financing

Purchase

Distribution in percentage

0 %


Costs of solar materials

Total cost of solar system

45,800 Euro


Detailed costs for

Collectors

13,800 Euro

Others

./.


Operation costs of heating system

Increase of the operation cost after CSTS implementation

not available

 

 

Special note for subsidy systems in the partner country

If investment was done by private person maximum subsidies 2,083 € could have been be gained.

 

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Development & experiences

Summary of experiences / Notices to the project performance

According to the observation of the system performance since operation started in October 2005 it was found out, that the system is very reliable due to a combination of antifreeze use and drain-back freezing and overheating protection. The priority of bought heat storage heating and variable flow operation is contributing to the high solar collector yield: 700 kWh/(sqm·a)!

 


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?

not available

Effects on rental fees?

No


Experiences technical staff

Experienced problems or failures?

No

Found solutions to these problems or failures?

./.

 


 Drain-back expansion chamber

Installer
Ciril Pezdir s.p.
Mr. Ciril Pezdir
Drobtinška pot 11
Brezovica pri Ljubljani, Slovenia
Phone: +386 41 585786

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Downloads

SOLARGE_goodpractice_si_techcentrespan.pdf

this datasheet in printable PDF-format

0.9 M

Techcentre-Span_scheme.pdf

the hydraulic scheme

496 K

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

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