SOLARGE

Königsberger Straße

Wiesbaden, Germany

Multi-family house | 34 sqm installation

 


Project summary · Technical description · Financing · Development · Downloads

Project Summary

Description

Bad thermal values of the old oil-fired boiler gave the impulse to renovate the entire building. The conducted measures affect the building itself and also the renewal of the heat production. 26,000 litres fuel oil where needed prior to the renovation – this equals 260,000 kWh. Natural gas consumption is forecast to decrease down to 80,000 kWh after the renovation. This thermal solar plant is only used for hot tap water heating.


 


Building

Type of building

Multi-family house

Number of dwellings, floors

45 users
20 dwellings
4 floors

Year of construction

1972/2004

Total effective area (heated)

1,260 m2

Hot tap water consumption (measured/estimated)

420 m3/a

Whole energy consumption for heating purpose after CSTS implementation

80,000 kWh/a


System engineering

Year of construction of CSTS

2005

Type of collectors

Flat plate collectors

Thermal power

21 kWtherm.

Aperture area of collectors*)

30.4 m2

Buffer storage

./. m3

Hot tap water storage

1.5 m3

Total capacity of boilers with energy source

90 kW,
Natural gas

Type of hot tap water heating

Centralised

Type of heating system

Centralised


Costs

Total cost solar system

26,500 Euro

Cost of the CSTS/gross area of collectors

780 Euro/m2

Subsidies

100 %


Output

Output of solar heat**)

15,000 kWh/a

Reduction of final energy***)

17,700 kWh/a

CO2-emissions avoided

3.8 t CO2/a

Solar performance guarantee

not available


*) 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

 

 


Bernd-Uwe Schneider,
owner:

"The solar plant was built during the energetic reconstruction of the building. The excellent preparation and technical planning has been a sure road to success. This state of the art solar plant leaves hopes for future earnings and long-lasting durability for the next 20 years. The advantages of solar plants should always be emphasized."

 

 


Owner

Owner
Bernd-Uwe Schneider
Ostendstrasse 19
D-63150 Heusenstamm, Germany
Phone: +49 69 2557-1656
Fax: +49 69 2557-1891
bernd-uwe.schneider(at)areva.com


Operator

see Owner

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Technical description

 


Description of the CSTS

Year of construction of CSTS

2005

Thermal power

21 kWtherm.

Gross area of collectors

33.96 m2

Aperture area of collectors

30.40 m2 

Type of collectors

Flat plate collectors

Type of assembly

On flat roof

Orientation of collectors

South (0°)

Inclination angle to horizon

35°

Freezing protection

Glycol

Overheating protection

Expansion vessel

Operation mode

Variable flow

Use of CSTS for

Hot tap water heating

Buffer storage

./. m3

Hot tap water storage

1.5 m3 (2 × 750 l, standard solar storage tanks)

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

2 × 750 l m3

Specification (if necessary)

Backup heating volume:
2 × 310 l


Space heating system

Type of heating system

Centralised

Number of boilers

2

Total capacity (power output) of boilers

90 kW

Capacity of each boiler (year of construction)

No. 1: 30 kW (2004)
No. 2: 60 kW (2004)

Energy source

Natural gas

Type of boiler system

Condensing


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

15,000 kWh/a

Origin of data

Calculated

Measuring point

Between collector and storage

Reduction of final energy

17,700 kWh/a

Origin of data

Design (T-Sol Pro 4.03)

Solar performance guarantee

No


Heat consumption

Whole energy consumption for heating purposes after CSTS implementation

80,000 kWh/a

Origin of data

Estimated

Energy used for heating of

Hot tap water heating,
space heating

Whole energy consumption for heating purposes before CSTS implementation

260,000 kWh/a

Total tap water consumption

not available

Hot tap water consumption

420 m3/a

Hot tap water temperature

55–60 °C

Cold water temperature

12 °C

 

 


Summary

The plant equals a classic thermal solar plant. Two bivalent solar tanks with 750 l each were parallel connected. The collector field consists of four large scale collectors "Großkollektoreinheiten" with 8.49 sqm each, which is built on the flat roof. The solar fraction for hot tap water generation is about 42 %.

 



 


Planner & Producer

ÖKOTHERM Energiesysteme GmbH
Matthias Heimbächer
Waldstr. 138
D-65197 Wiesbaden, Germany
Phone: +49 611 890596-51
Fax: +49 611 890596-52
info(at)oekotherm-solartechnik.de
www.oekotherm-solartechnik.de 

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Financing and investment

Introduction

This measure is very profitable. A return-of-investment within 10 years can be achieved.


 


Financing of the CSTS

Form of financing

Purchase

Distribution in percentage

100 %


Costs of solar materials

Total cost of solar system

26,500 Euro

Detailed costs for

Collectors

8,880 Euro

Elevation/mounting structure

1,430 Euro

Storage/heat exchanger

3,598 Euro

Control

585 Euro

Installation

8,637Euro

Others

1,000 Euro


Operation costs of heating system

Increase of the operation cost after CSTS implementation

115 Euro/a
(Power cost for pumping, Maintenance cost)

 



The investor got soft loans from KfW promotional bank (tax allowance: since 2004 split for 4 years) and 3,000 EUR subsidies by the BAFA (Federal Office of Economics and Export Control) within the market stimulation programme of the Federation.

 


Addresses


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Development & experiences

 


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?

Yes

Effects on rental fees?

No


Experiences technical staff

Experienced problems or failures?

No

Found solutions to these problems or failures?

./.

 


Summary of experiences / Notices to the project performance

The condensing boiler technology and the solar plant have coordinated and operate faultless. Since roof insulation and set up of the solar thermal plant were done parallel, no problems occurred with the different manufacturers. The integration of the solar thermal hydraulic system into the existing plant was well planned and implemented. The trouble-free operation should be assessed prior to the project start. Including a solid financing that can be compensated by rental revenue. It’s also important to inform the tenants well in advance.

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

Downloads

SOLARGE_goodpractice_de_koenigsberger.pdf

this datasheet in printable PDF-format

0.9 M

koenigsberger_scheme.pdf

the hydraulic scheme

80 K