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Berlin, Germany
Hotel | 27 sqm installation
+++ photo gallery +++
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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 The increase of comfort standard was not to manage with the 50-years-old out-of-date steam heating system.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.
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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
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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
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*) 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
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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.“
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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
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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 | 0°
| 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
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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) | ./.
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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
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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
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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).
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Planning / Engineering
| EnergieBISS GmbH
(SOLON AG now )
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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. | 
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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)
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Operation costs of heating system
| Increase of the operation cost after CSTS implementation | 100 Euro
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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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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.
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| 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.
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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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last update: 2006-07-14
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