SOLARGE

DEGEWO - solar plant (Fonds object)

Berlin, Germany

Multi-family house | 60 sqm installation

 


Project summary · Technical description · Financing · Development · Downloads

Project Summary

Description

Seven large format collectors with an absorber surface of each 8.4 m² (58.8 m²) were set up on the roof. These are high speed panel collectors with corrosion- and weather-proof aluminum framework as units. The collector contains a wide copper plate absorber with highly selective, extremely age-resisting and pollution free vacuum coating (TINOX).
The solar energy is discharged into the solar compact station, into the water heating, the heater support and if appropriate surplus is present, into the „solar buffer storages“.
In the context of the maintenance the water heating was renewed. A boiler was replaced by a smaller modern fuel value boiler. This generates approx. 60–70 % of the yearly amount of heat furnish. The heat supply was changed over to an efficient natural gas operation with lower emission values.



 


Building

Type of building

Multi family house

Number of dwellings, floors

53 dwellings
4/5 floors

Year of construction

1970

Total effective area (heated)

4,266 m2

Hot tap water consumption (measured/estimated)

1,413.5 m3/a (measured)

Whole energy consumption for heating purpose after CSTS implementation

1,009,630 kWh/a


System engineering

Year of construction of CSTS

2004

Type of collectors

Flat plate collectors

Thermal power

37.9 kWtherm.

Aperture area of collectors*)

54.18 m2

Buffer storage

1.3 m3

Hot tap water storage

0.5 m3

Total capacity of boilers with energy source

430 kW, Natural gas

Type of hot tap water heating

Centralised

Type of heating system

Centralised


Costs

Total cost solar system

69,943.76 Euro

Cost of the CSTS/gross area of collectors

1,190 Euro/m2

Subsidies

16 %


Output

Output of solar heat**)

29,050 kWh/a

Reduction of final energy***)

not available

CO2-emissions avoided

7.38 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

 

 


Volker Ries, DEGEWO AG (Project leader Building services)

Large thermal solar plants are to be operated efficiently, gains and costs calculably, if the plants are considered from the outset in planning and implemented with competent partners. Personal commitment and persistence are absolutely necessary for the implementation of such projects.

 

 


Owner

DEGEWO gAG
Potsdamer Straße 60
10785 Berlin, Germany
Phone: +49 30 26485-0
Fax: +49 30 26485-120
info@degewo.de
www.degewo.de

Project leader Building services:
Volker Ries
Project group 1 DEGEWO
DEGEWO-Group
Potsdamer Str. 60 10785 Berlin
Phone: +49 30 26485-453
Fax: +49 30 26485-555
volker_ries@degewo.de
www.degewo.de


Operator

see Owner

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

Technical description

 


Description of the CSTS

Year of construction of CSTS

2004

Thermal power

37.9 kWtherm.

Gross area of collectors

58.8 m2

Aperture area of collectors

54.18 m2

Type of collectors

Flat plate collector

Type of assembly

On flat roof

Orientation of collectors

South-East (10°)

Inclination angle to horizon

30°

Freezing protection

Glycol

Overheating protection

Expansion vessel

Operation mode

Low flow

Use of CSTS for

Hot tap water heating, Space heating

Buffer storage

1.3 m3

Hot tap water storage

0.5 m3

Control of backup-system/CSTS

Shared control: central regulation solar, solar heater support, buffer storage- and dischargemanagement, heating circuit, warm water heating and boiler control over a 0–10 V-signal, long-distance data exchange with a GSM-Modem for monitoring the plant


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

0.5 m3

Specification (if necessary)

Central


Space heating system

Type of heating system

Centralised

Number of boilers

2

Total capacity (power output) of boilers

430 kW

Capacity of each boiler (year of construction)

No. 1: 110 (2004)
No. 2: 320 (1993)

Energy source

Natural gas

Type of boiler system

Low temperature, Condensing


Type of operation

Operator of the CSTS system

ESCO

CSTS monitoring

Yes (Solar radiation, Output of solar heat, Total water consumption) All parameters shown; all parameters can be parameterised afar (Plan_E GmbH)

Data accessible via internet

Yes

Scientific monitoring & follow up

Yes

Maintenance contract

Yes (1 time per year)

Visualisation of the solar heat output

Yes (Huge display on an external wall)


Yield of CSTS plant

Output of solar heat

29,050 kWh/a

Origin of data

Measured

Measuring point

Between collector and storage (collector output)

Reduction of final energy

not available

Origin of data

./.

Solar performance guarantee

No


Heat consumption

Whole energy consumption for heating purposes after CSTS implementation

1,009,630 kWh/a

Origin of data

Measured

Energy used for heating of

Hot tap water heating, Space heating

Whole energy consumption for heating purposes before CSTS implementation

1,332,090 kWh/a

Total tap water consumption

not available

Hot tap water consumption

1,413.5 m3/a

Hot tap water temperature

55 °C

Cold water temperature

10 °C

 

 


Summary

The solar plant consists of a collector field of 59 m² and the central regulation- and con­trolling unit. The solar energy is used for the warm water heating, heater support and for the thermal solar Legionella-circuit by the solar compact station and is complemented by fossil heat only if neccessary.
The solar plant, the water heating, the space heating and the boilers are operated by a central automatic controller, so that apart from the energy saving by the solar plant, with this system further saving potentials in the conventional enterprise of the boiler can still be developed by the use of synergies.
In the context of the maintenance the water heating was renewed. A boiler was replaced by a smaller modern fuel value boiler. This generates approx. 60–70 % of the yearly amount of heat furnish. The remaining second boiler received a new modulating gas burner. The heat supply was changed over to a more pollution free natural gas operation. The pipings and armatures in the heating plant room, which were not renewed, received a lagging in accordance with the EnEV.3. for water heating and heater support.


 


Planner

Plan_E GmbH
Bernhard Jurisch
Parkstraße 7–9
13187 Berlin, Germany
Phone: +49 30 48160-190
Fax: +49 30 48160-199
b.jurisch@planen-energie.de
www.planen-energie.de


Installer



Producer

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Financing and investment

Introduction

The purchase of the installation has been financed by subsidies (11.500 Euro) from the market stimulation programme of the Federation, the changeover bonus of the GASAG and equity capital of the owners’ association.

 


Financing of the CSTS

Form of financing

Purchase,
84 % self financing

Distribution in percentage

16 %


Costs of solar materials

Total cost of solar system

69,943.76 Euro


Detailed costs for

Collectors

not available

Elevation/mounting structure

not available

Storage, heat exchanger

not available

Back-up heater

not available

Control

not available

Installation

not available

Planning/Engineering

7,918.83 Euro

Others

Module solar station SEZ 60

Module solar heating

Insulation SEZ

controller

Switchboard

Implementing SEZ

Buffer storage solar

Expansion vessel for solar buffer

Collectors and supplies

Pipelines, insulations solar

 

8,461.46 Euro

1,247.39 Euro

726.45 Euro

3,116.33 Euro

4,462.71 Euro

545.66 Euro

3,142.41 Euro

462.61 Euro

30,116.22 Euro

9,743.69 Euro


Operation costs of heating system

Power cost for pumping

not available

Maintenance cost

not available

Monitoring cost

not available

Other operation cost

not available

Total operation cost

not available

or: Increase of the operation cost after CSTS implementation

not available

 

 

Special note for subsidy systems in the partner country

· GASAG: 5,000 Euro
· BAFA: 6,490 Euro

 

 


Addresses

GASAG
Berliner Gaswerke Aktiengesellschaft
www.gasag.de

Federal Office of Economics and Export Control (BAFA)
Frankfurter Straße 29–35
65760 Eschborn, Germany
Phone: +49 6196 908-0
Fax: +49 6196 908-800
www.bafa.de

 

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

Development & experiences

Quantitative aspects of the CSTS

Motivation of management and investing department:
Ecological image: medium
Economical issues: high
Interest in new technology: low
Additional values of project according to national framework: Yes, presentable in the Energy passport

Statement by Volker Ries, DEGEWO AG / Project leader Building services:

The presented project was realized as a project in the context of the solar reorganization strategy of the DEGEWO.
On the base of the positive experiences in co-operation with the project partners and obtained total energy savings, today the early examination of the application type takes place during the redevelopment planning by default.
The efficiency of the measure must be given for the real estate enterprises here.
The fears of contact and prejudices in relation to the solar technology are latently present in co-operation with the construction participants and with the decision makers. Much convincing has to be accomplished, also due to errors in the past. Since the introduction of the energy saving regulation for many the crucial point of economy at the suitable object is still more impressively representable.
With the introduction of an energy passport starting from 2006 there will be a further argument for the application of renewable energies. For housebuilding, the solar thermal offers during the old building repair the possibility of an energy­-efficient inventory reorganization, in connection with the conventional measures, and thus the chance to a sustainable value enhancement of the buildings

 


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?

No

Effects on rental fees?

Yes


Experiences technical staff

Experienced problems or failures?

not available

Found solutions to these problems or failures?

not available

 

 


Addresses


 

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

Downloads

SOLARGE_goodpractice_de_degewo.pdf

this datasheet in printable PDF-format.

2.4 M

DEGEWO_scheme_SEZ_Schema_Belegungen_R36_KES_Standard.pdf

the hydraulic scheme

800 K