SOLARGE

Brędstrup Fjernvarme

Brędstrup, Denmark

Others: District heating | 8,000 sqm installation


 


Project summary · Technical description · Financing · Development · Downloads

Project Summary

Description
8000 m² solar heating plant in combination with a CHP plant based on natural gas to produce district heating for the community. The new in this project is to demonstrate how solar heat and CHP can complement each other based on market prices, so the use of natural gas and thereby the CO2-emission reduces. The 8000 m² are expected to produce 4,000 MWh annually which is 10 % of the total heat production.


 


Building

Type of building

District heating plant

Number of users / dwellings, floors

1,400 buildings

Year of construction

./.

Total effective area (heated)

291,250 m2

Hot tap water consumption (measured/estimated)

./.

Whole energy consumption for heating purpose after CSTS implementation

40,000,000 kWh/a


System engineering

Year of construction of CSTS

2007

Type of collectors

Flat plate collectors

Thermal power

6,000 kWtherm.

Aperture area of collectors*)

not available 

Buffer storage

2,000 m3

Hot tap water storage

./.

Total capacity of boilers with energy source

29,800 kW, CHP natural gas

Type of hot tap water heating

./.

Type of heating system

Centralised


Costs

Total cost solar system

1,570,000 Euro 1)

Cost of the CSTS / gross area of collectors

196 Euro/m2 1)

Subsidies

22 %

1): costs for storage and back-up heater are not included


Output

Output of solar heat**)

4,000,000 kWh/a

Reduction of final energy***)

4,000,000 kWh/a

CO2-emissions avoided

4,300 t CO2/a

Solar performance guarantee

*) 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

 

 


Per Kristensen, Brędstrup Fjernvarme Managing Director:

"The solar system has a pay-back time of six years, and the decision to install the solar heating system is based on long-term economical and technical considerations.
The solar heating systems makes our production less depended on natural gas and is necessary for us to keep our district heating cost-effective in the future."

 

 


Owner

Brędstrup Fjernvarme
Per Kristensen
Fjernvarmevej 2
8740 Brędstrup, Denmark
Phone: +45 75 7533-00
Fax: +45 75 7535-19
pk(at)braedstrup-fjernvarme.dk
www.braedstrup-fjernvarme.dk


Operator

See owner

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Technical description

 


Description of the CSTS

Year of construction of CSTS

2007

Thermal power

6,000 kWtherm.

Gross area of collectors

8,000 m2

Aperture area of collectors

not available

Type of collectors

Flat plate collectors

Type of assembly

Ground mounted

Orientation of collectors

South (0°)

Inclination angle to horizon

35°

Freezing protection

Glycol

Overheating protection

Expansion vessel

Operation mode

Variable

Use of CSTS for

District heating supply

Buffer storage

2,000 m3

Hot tap water storage

./. 

Control of backup-system / CSTS

Separated control


Hot tap water system

Type of hot water heating

./.

Recirculation system

./.

For decentralised systems:
The installation on the consumer site

./.

Size of storage for hot tap water

./.

Specification (if necessary)

./.


Space heating system

Type of heating system

Centralised

Number of boilers

2 CHP unist and 2 boilers

Total capacity (power output) of boilers

7,800 kW (CHP) + 22,000 kW (boilers) = 29,800 kW

Capacity of each boiler (year of construction)

No. 1: 3,900 kW
No. 2: 3,900 kW
No. 3: 8,000 kW
No. 4: 14,000 kW

Energy source

Natural gas

Type of boiler system

not available


Type of operation

Operator of the CSTS system

Self-operation

CSTS monitoring

Yes: solar radiation output of solar heat. Comprehensive monitoring supervised by PlanEnergi

Data accessible via internet

Yes

Scientific monitoring / follow up

Yes

Maintenance contract

No

Visualisation of the solar heat output

not available


Yield of CSTS plant

Output of solar heat

4,000,000 kWh/a

Origin of data

Design (calculated)

Measuring point

Between collector and storage

Reduction of final energy

4,000,000 kWh/a

Origin of data

Design (calculated)

Solar performance guarantee

Yes


Heat consumption

Whole energy consumption for heating purposes after CSTS implementation

40,000,000 kWh/a

Origin of data

Measured, from annual report

Energy used for

District heating

Whole energy consumption for heating purposes before CSTS implementation

40,000,000 kWh/a

Total tap water consumption

./.

Hot tap water consumption

./.

Hot tap water temperature

./.

Cold water temperature

./.

 

 


Summary

The solar collector field is via a heat exchanger connected to the accumulation tank and the CHP unit, which again via a heat exchanger is connected to two gas boilers and the district heating network. When solar heat is available it is either distributed to the network or to the accumulation tank depending on the actual situation (heat demand, electricity prices etc.)




(from www.braedstrup-fjernvarme.dk)

 

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Financing and investment

 


Financing of the CSTS

Form of financing

Purchase

Distribution in percentage

22 % subsidies (energinet.dk)
78 % loans


Costs of solar materials

Total cost of solar system

1,570,000 Euro

Detailed costs for

Collectors

1,268,000 Euro
incl. installation

Elevation / mounting structure

27,000 Euro

Storage / heat exchanger

85,235 Euro

Backup heater

./.

Control

23,000 Euro

Installation

119,000 Euro
(piping)

Planning / Engineering

./.

Others: information to public

48,000 Euro


Operation costs of heating system

Increase of the operation cost after CSTS implementation

not available

 

 




The Project has received subsidy from energinet.dk because of the development of solar heat in combination with CHP.

 


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Development & experiences

 


Experiences management

Experienced problems or failures?

Yes: This system is the first system worldwide to combine solar heat and CHP and this has given some control problems.

Found solutions to these problems or failures?

No, but the problems are expected to be solved soon.


Financial effects / project performance

Project economically efficient?

Yes

Fiscal or other financial effects?

Yes: The heat production price by solar heat is lower than heat production based on natural gas, so the solar system makes the prices for the district heating consumers less depended on the price of natural gas.

Effects on rental fees?

./.


Experiences technical staff

Experienced problems or failures?

See above

Found solutions to these problems or failures?

See above

 



Summary of experiences / Notices to the project performance

The solar system is economical efficient and the makes the heat production more flexible and less depended on natural gas.

The systems performance is so far ok. However, as the combination of solar heat and CHP is new, this has given some control problems, which is expected to be solved soon.

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Downloads

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