SOLARGE

Die Fabrik

Berlin, Germany

Hotel | 27 sqm installation

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Project summary · Technical description · Financing · Development · Downloads

Project Summary

Description

The hotel „Die Fabrik“ is located in a former industrial building, where telephones were produced. In 1994 when the building was reconstructed as hotel rooms, bathrooms, the lobby and a restaurant were created. The increase of comfort standard was not to manage with the 50-years-old out-of-date steam heating system. Therefore in 1999 the whole building was energetic modernised, including the boilers (fuel switch to natural gas) and the heating system (pipes, radiators). Within the concept the installation of a solar thermal plant for hot-water generation and heating support was planned. The entire measures were funded the UFP Environmental Funding Program of Berlin.


 


Building

Type of building

Hotel

Number of dwellings, floors

120 beds
5 floors

Year of construction

1905 (1994)

Total effective area (heated)

1,650 m2

Hot tap water consumption (measured/estimated)

not available

Whole energy consumption for heating purpose after CSTS implementation

226,950 kWh/a


System engineering

Year of construction of CSTS

1999

Type of collectors

Vaccum tube collectors

Thermal power

approx. 16 kWtherm.

Aperture area of collectors*)

approx. 23 m2

Buffer storage

2.25 m3

Hot tap water storage

0.8 m3

Total capacity of boilers with energy source

120 kW,
natural gas

Type of hot tap water heating

Centralised

Type of heating system

Centralised


Costs

Total cost solar system

approx.
40,000 Euro

Cost of the CSTS/gross area of collectors

approx.
1,480 Euro/m2

Subsidies

33 %


Output

Output of solar heat**)

16,000 kWh/a

Reduction of final energy***)

35,000 kWh/a

CO2-emissions avoided

48 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

 

 


Georg Krug, Die Fabrik:

„Within the scope of the changed utilisation of the building from industrial to hotel use, the solar thermal system was and is a high valued part of the buildings concept. The outcome of the solar thermal plant gives an economic relief on the energy costs, that is becoming even more important since the current energy prices development.
Nevertheless also the image of “Die Fabrik” is stamped by the innovative energy concept – a factor, that is well received by the guests.“

 

 


Owner

Die Fabrik
Georg Krug
Schlesische Str. 18
10997 Berlin, Germany
Phone: +49 30 6118254
Fax: +49 30 6189974
info(at)diefabrik.com
www.diefabrik.com


Operater

See owner

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Technical description

 

 


Description of the CSTS

Year of construction of CSTS

1999

Thermal power

approx. 16 kWtherm.

Gross area of collectors

27 m2

Aperture area of collectors

approx. 23 m2 

Type of collectors

Vacuum tube collectors

Type of assembly

On flat roof

Orientation of collectors

./.

Inclination angle to horizon


Freezing protection

Glycol

Overheating protection

Expansion vessel

Operation mode

Low flow

Use of CSTS for

Hot tap water heating, space heating

Buffer storage

2.25 m3
(3×0.75 m3)

Hot tap water storage

0.8 m3 (1×0.8 m3)

Control of backup-system/CSTS

Shared 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

0.8 m3

Specification (if necessary)

./.


Space heating system

Type of heating system

Centralised

Number of boilers

2

Total capacity (power output) of boilers

120 kW

Capacity of each boiler (year of construction)

all: 60 kW (1999)

Energy source

Natural gas

Type of boiler system

Condensing


Type of operation

Operator of the CSTS system

Self-operation

CSTS monitoring

Yes: solar radiation, output of solar heat, current output; regular monitoring by the operator
(read-out data from the control unit)
monitoring by visualisation of solar output and CO2 in the hotels lobby

Data accessible via internet

No

Scientific monitoring & follow up

No

Maintenance contract

Yes: once a year

Visualisation of the solar heat output

Yes: display in hotel's lobby


Yield of CSTS plant

Output of solar heat

16,000 kWh/a

Origin of data

Measured

Measuring point

Between collector and storage

Reduction of final energy

35,000 kWh/a

Origin of data

Calculated

Solar performance guarantee

No


Heat consumption

Whole energy consumption for heating purposes after CSTS implementation

226,950 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

361,000 kWh/a

Total tap water consumption

1,600 m3/a

Hot tap water consumption

not available

Hot tap water temperature

60 °C

Cold water temperature

10 °C

 

 


Summary

The 27 m˛ vacuum tube collectors were installed directly planar on the flat roof of the hotels rear building – without mounting system. This solution was chosen because of static reasons. The high-performance collectors are connected with an efficient buffer storage system of 2,25 m3 in the heating center. Integrated in the heating system with a shared control unit the system covers 8 % of energy for heating and 43 % of energy for hot water generation (results from simulation).


 


Planning / Engineering 

EnergieBISS GmbH
(SOLON AG now )

 

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Financing and investment

Introduction

The solar thermal system was implemented as a main part of the entire concept for energetic modernisation. The granted subsidies from the UFP Program amount to one third of the final costs for all implemented measures (planning and installation). Since the resulting savings of energy are high as well as the grants share on the investment, the whole project reaches a good profitability.


 


Financing of the CSTS

Form of financing

Purchase

Distribution in percentage

33 %


Costs of solar materials

Total cost of solar system

approx. 40.000 Euro (excl. planning)
solar thermal system was part of the total measures for modernisation, total costs 120.000 Euro

Detailed costs for

Planning / Engineering

15,000 Euro
(all measures)


Operation costs of heating system

Increase of the operation cost after CSTS implementation

100 Euro

 

 



Within the regional Environmental Program (UFP) measures for inner city environmental improvement were funded until 2005 in Berlin. Here: 70,500 EUR for all measures


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Development & experiences

Qualitative aspects of the CSTS

The modernisation of the heating system was necessary, because of the overaged existing system. The integration of a solar thermal system was identified as a good technical alternative – deciding for the solar thermal plant was the fact, that the subsidies were just paid for innovative energy concept.

Summary of experiences / Notices to the project performance
Within the scope of the changed utilisation of the building from industrial to hotel use, the solar thermal system was and is a high valued part of the buildings concept. The outcome of the solar thermal plant gives an economic relief on the energy costs, that is becoming even more important since the current energy prices development.
Nevertheless also the image of “Die Fabrik” is stamped by the innovative energy concept – a factor, that is well received by the guests.


Experiences management

Experienced problems or failures?

No

Found solutions to these problems or failures?

In the first two years after installation optimisations on the plants were done, an interruption of operation did not take place.


Financial effects / project performance

Project economically efficient?

Yes

Fiscal or other financial effects?

No

Effects on rental fees?

No


Experiences technical staff

Experienced problems or failures?

not available

Found solutions to these problems or failures?

not available

 


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Downloads

SOLARGE_goodpractice_de_diefabrik.pdf

this datasheet in printable PDF-format

852 K

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

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last update: 2006-07-14