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Rise, Aeroe, Denmark
District heating plant | 3,600 sqm installation
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Description
To establish a new district heating plant for the mayor part of the buildings in the villages Rise and Dunkaer. 115 buildings are connected including 100 single family houses, the school, church, inn, old peoples home and the primary school.
The source of heat is 47 % solar heating and 53 % wood pellets. The intention was 50/50.
The CSTC is 3,600 m2, pellet boiler is 800 kW. The heat storage (seasonal storage) is 4,000 m3.
The max. heat load is 1,300 kW.
The annual sale of heat is 2,400 MWh to the consumers. The heat lost in the network is 850 MWh, giving an annual demand from solar and pellets of 3,250 MWh.
The CSTC is ground mounted. The storage is a vertical steel tank of diameter 20 m and a height of 13 m. |
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Building
| Type of building | District heating plant
| Number of dwellings, floors | 115 buildings
| Year of construction | not available
| Total effective area (heated) | not available | Hot tap water consumption (measured/estimated) | 1,200 m3/a
(estimated)
| Whole energy consumption for heating purpose after CSTS implementation | 2,082,000 kWh/a
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System engineering
| Year of construction of CSTS | 2001 | Type of collectors | Flat plate collectors
| Thermal power | 2,500 kWtherm.
| Aperture area of collectors*) | 3,582 m2 | Buffer storage | 4,000 m3 | Hot tap water storage | 12.0 m3 | Total capacity of boilers with energy source | 800 kW
(wod pellets)
| Type of hot tap water heating | Decentralised
| Type of heating system | Centralised
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Costs
| Total cost solar system | 697,200 Euro | Cost of the CSTS/gross area of collectors | 191 Euro/m2 | Subsidies | 30 % |
Output
| Output of solar heat**) | 1,645,000 kWh/a | Reduction of final energy***) | 1,645,000 kWh/a
| CO2-emissions avoided | 1,1564 t CO2/a
| Solar performance guarantee | Yes
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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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Flemming Ulbjerg,
Engineer / project manager:
| „Technical well performing, due to the integration of all parts, including radiators etc. by the consumer.
The economy is o.k. now compared to continued individual supply of heating by oil and electricity.“
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Owner and operator
| Rise Fjernvarme Amba (Rise District Heating)
Henning Schmidt
Kirkeballevej 10
5970 Aeroeskoebing, Denmark
Phone: +45 62 522680
hsmidt(at)dlgnet.dk
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Description of the CSTS
| Year of construction of CSTS | 2001
| Thermal power | 2,500 kWtherm. | Gross area of collectors | 3,650 m2 | Aperture area of collectors | 3,582 m2 | Type of collectors | Flat plate collectors
| Type of assembly | Ground mounted
| Orientation of collectors | South (0°) | Inclination angle to horizon | 40°
| Freezing protection | Glycol
| Overheating protection | Cooling in panles at nigth time | Operation mode | Variable
| Use of CSTS for | Hot tap water heating, Space heating
| Buffer storage | 4,000 m3 | Hot tap water storage | 12.0 m3 | Control of backup-system/CSTS | Shared control
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Hot tap water system
| Type of hot water heating | Decentralised
| Recirculation system | No
| For decentralised systems:
The installation on the consumer site | Hot water tanks
| Size of storage for hot tap water | 115 × 110 litres
= 12.650 m3 | Specification (if necessary) | ./.
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Space heating system
| Type of heating system | Centralised
| Number of boilers | 1
| Total capacity (power output) of boilers | 800 kW | Capacity of each boiler (year of construction) | No.1: 800 kW (2001)
| Energy source | Wood pellets
| Type of boiler system | Standard
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Type of operation
| Operator of the CSTS system | ESCO, neighbour district heating personnel
| CSTS monitoring | Yes: solar radiation, output of solar heat, heat produced. Automatic monitoring via the SCADA system.
| Data accessible via internet | No
| Scientific monitoring & follow up | Yes
| Maintenance contract | No
| Visualisation of the solar heat output | Yes: Screen dumps at the SCADA system.
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Yield of CSTS plant
| Output of solar heat | 1.645,000 kWh/a | Origin of data | Measured
| Measuring point | Between collector and storage
| Reduction of final energy | 1,645,000 kWh/a | Origin of data | Building owners
| Solar performance guarantee | Yes
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Heat consumption
| Whole energy consumption for heating purposes after CSTS implementation | 2,082,000 kWh/a | Origin of data | Measured
| Energy used for | Hot tap water heating, space heating
| Whole energy consumption for heating purposes before CSTS implementation | 3,500,000 kWh/a | Total tap water consumption | 3,600 m3/a | Hot tap water consumption | 1,200 m3/a | Hot tap water temperature | 50 °C | Cold water temperature | 10 °C | |
Summary
| The CSTS is installed at the district heating plant, ground mounted. The flow in the solar circuit is operated by variable flow mode as well is the secondary circuit. The main part of the year the output temperature from the plant is at a level of 90 °C.
Input is in winter 30 °C rising to 40–50 °C in the summer time.
The produced heat is partly used to cover the actual demand and partly led to the heat storage.
In the winter period the pellet boiler is in operation and does also have access to the heat storage (upper part only).
In peak load situations in winters, the pellet boiler in parallel to the storage does cover the demand.
The pellet boiler is out of operation from may until october. |
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Introduction The financing is done by grants from Danish Energy Agency and a loan in a special bank („Municipality credit“). The loan is guaranteed by the municipality, giving a reduced interest.
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Financing of the CSTS
| Form of financing | Purchase | Distribution in percentage | 100 % |
Costs of solar materials
| Total cost of solar system | 697,200 Euro |
Detailed costs for
| Storage, heat exchanger | 346,000 Euro | Back-up heater | 108,000 Euro | Control | 47,000 Euro |
Operation costs of heating system
| or: Increase of the operation cost after CSTS implementation | No figures are available. The district heating plant replaces 115 individual boilers. | |
Special note for subsidy systems in the partner country | The subsidies were from the Danish energy Agency, 3 different parts (30 %).
The rest is financed by municipality guaranteed loans
(70 %).
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Quantitative aspects of the CSTS
Rise Fjernvarme is part of a national programme to develop seasonal heat storages (Danish Energy Agency).
A national strategy for development of solar heating and seasonal storages. Solar fractions of 50 % is one of the goals.
| | Summary of experiences / Notices to the project performance
The technical performances and the integration of all parts, right from the radiator by the consumer to the control of the CSTS and the boiler and heat storage.
The extra investment in balancing the existing installations, new hot water tanks, reduced network dimensions etc. is performing as expected and is far better than other new district heating plants.
The return temperatures in Rise are at a level of 30–36 degrees year around, compared to others at a level of 40–50 degrees or even higher.
As the oil prices now are at a stabile high level the economic aspects of the project are satisfied. |
Experiences management
| Experienced problems or failures? | Yes: Teflon foil in some of the panels was damaged after three years of operation. The influence at the performance is not yet known.
| Found solutions to these problems or failures? | Yes |
Financial effects / project performance
| Project economically efficient? | Yes
| Fiscal or other financial effects? | No
| Effects on rental fees? | No
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Experiences technical staff
| Experienced problems or failures? | Yes
| Found solutions to these problems or failures? | Yes
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