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Berlin, Germany
Multi-family house | 60 sqm installation
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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.
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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
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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
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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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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.
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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
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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
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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 | 0.5 m3 | Specification (if necessary) | Central
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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)
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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.
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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
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Producer
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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.
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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
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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
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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
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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? | ./.
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Financial effects / project performance
| Project economically efficient? | Yes
| Fiscal or other financial effects? | No
| Effects on rental fees? | Yes
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Experiences technical staff
| Experienced problems or failures? | not available
| Found solutions to these problems or failures? | not available | | |
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