SOLARGE

EWG Pankow

Berlin, Germany

Multi-family house | 170 sqm installation

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Project summary · Technical description · Financing · Development · Downloads

Project Summary

Description

In 2006 the EWG Berlin-Pankow, a building association located in north-east Berlin, started comprehensive modernisation and reconstruction measures on seven multi-family buildings of one building type. By centralisation of heating and hot water generation the most important condition for solar thermal were created. In five of the buildings also other boundary conditions (direction of the roofs) fit well for the integration of a solar thermal plant.
Task for the planner was to create a system that realises solar thermal by reasonable costs and light constructional changes on the buildings. It was also predetermined, that the compact heating stations should not be changed due to solar thermal installation.
Under these circumstances it has been decided to build a direct-feed-in system.



 


Building

Type of building

Multi-family house

Number of users / dwellings, floors

300 users
148 dwellings
4 floors

Year of construction

1959

Total effective area (heated)

7634 m2

Hot tap water consumption (measured/estimated)

not available

Whole energy consumption for heating purpose after CSTS implementation

852,000 kWh/a


System engineering

Year of construction of CSTS

2006

Type of collectors

Flat plate collectors

Thermal power

100 kWtherm.

Aperture area of collectors*)

146 m2

Buffer storage

./. m3

Hot tap water storage

1.7 m3

Total capacity of boilers with energy source

140 kW, natural gas

Type of hot tap water heating

Centralised

Type of heating system

Centralised


Costs

Total cost solar system

106,400 Euro

Cost of the CSTS / gross area of collectors

626 Euro/m2

Subsidies

0 %


Output

Output of solar heat**)

73,100 kWh/a (prognosis)

Reduction of final energy***)

59,900 kWh/a (prognosis)

CO2-emissions avoided

15,4 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

Erste Wohnungsgenossenschaft Berlin-Pankow e. G.
Mr. Mackenrodt / technical manager
Arconastr. 45–49
13189 Berlin, Germany
Phone: +49 30 477006-0
Fax: +49 30 477006-11
mackenrodt(at)ewg-pankow.de
www.ewg-pankow.de


Operator

See owner

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Technical description

 


Description of the CSTS

Year of construction of CSTS

2006

Thermal power

100 kWtherm.

Gross area of collectors

170 m2

Aperture area of collectors

146 m2 

Type of collectors

Flat plate collectors

Type of assembly

Roof top

Orientation of collectors

South (0°)

Inclination angle to horizon

37°

Freezing protection

Glycol

Overheating protection

Expansion vessel

Operation mode

Variable

Use of CSTS for

Hot tap water heating

Buffer storage

no buffer storage, direct feed-in

Hot tap water storage

1.7 m3: 5 storage tanks: 4 × 300 l, 1 × 500 l

Control of backup-system / CSTS

Separated control


Hot tap water system

Type of hot water heating

Centralised

Recirculation system

For decentralised systems:
The installation on the consumer site

./.

Size of storage for hot tap water

1.7 m3

Specification (if necessary)

./.


Space heating system

Type of heating system

Centralised

Number of boilers

2

Total capacity (power output) of boilers

140 kW

Capacity of each boiler (year of construction)

No. 1: 70 kW (2006)
No. 2: 70 kW (2006)

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

Yes

Maintenance contract

Yes: twice a year

Visualisation of the solar heat output

No


Yield of CSTS plant

Output of solar heat

71,100 kWh/a

Origin of data

prognosis

Measuring point

Between collector and storage

Reduction of final energy

59,900 kWh/a

Origin of data

prognosis

Solar performance guarantee

No


Heat consumption

Whole energy consumption for heating purposes after CSTS implementation

852,000 kWh/a

Origin of data

Estimated

Energy used for

Hot tap water heating, space heating

Whole energy consumption for heating purposes before CSTS implementation

not to determine (single flat heating and hot water generation)

Total tap water consumption

3,400 m3/a

Hot tap water consumption

not available

Hot tap water temperature

60 °C

Cold water temperature

10 °C

 

 


Summary

Collectors with each 10 m­­2 area have been mounted on the roof top. The pipes of the solar circle lead to a heat exchanger located in a garret. The secondary side of the exchanger (a new installed pipe from cellar to roof) is used as a second load circle starting before cold water entry of the hot water storage and feeding in two legs of the circulation system, that were extended to the top floor.

Solar regulation and load regulation for the hot water storage (heat up by the condensing boiler) work separated but balanced in the operational parameters.



Click for larger view

 


Planner

Planungsbüro Barthel
Mr. Barthel
Rennbahnstr. 86
13086 Berlin, Germany
Phone: +49 30 479905-0
Fax: +49 30 479905-19
PBBarthel(at)t-online.de

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Financing and investment

 


Financing of the CSTS

Form of financing

Purchase

Distribution in percentage

0 %


Costs of solar materials

Total cost of solar system

106,400 Euro

Detailed costs for

not available

Collectors

not available

Elevation / mounting structure

not available

Storage / heat exchanger

not available 

Backup heater

not available

Control

not available 

Installation

not available

Planning / Engineering

15,000 Euro

Others

not available


Operation costs of heating system

Or:
Increase of the operation cost after CSTS implementation

has not yet been observed

 



Introduction

Definite evaluation will be possible after an operational phase of at least one year (also regarding climate influences). A second important factor for the economic valuation is the further development of energy prices. In general, the investor appreciates the installation of solar thermal as an investment in the future.


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Development & experiences

 


Experiences management

Experienced problems or failures?

No: In the first two month after installation optimisations on the plants were done, an interruption of operation did not take place.

Found solutions to these problems or failures?

./.


Financial effects / project performance

Project economically efficient?

Yes

Fiscal or other financial effects?

Yes: running costs for heating have been reduced

Effects on rental fees?

Yes: costs for solar thermal system are shared by rent increase (allocation of refurbishment costs)


Experiences technical staff

Experienced problems or failures?

not available

Found solutions to these problems or failures?

not available

 



Qualitative aspects of the CSTS

At the beginning there has been the plan to realise a plant referring to the "Schweizer Modell" (Swiss model). That was not possible due to delivery problems with the compact module of Circo Solar. Therefore another type of direct feed-in system has been developed and implemented.


 

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

Downloads

SOLARGE_goodpractice_de_ewgpankow.pdf

this datasheet in printable PDF-format

1.1 M

ewgpankow_scheme.pdf

the hydraulic scheme

365 K

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