SOLARGE

Rise Fjernvarme

Rise, Aeroe, Denmark

District heating plant | 3,600 sqm installation

 


Project summary · Technical description · Financing · Development · Downloads

Project Summary

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.

­­­­­



 


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


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


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


*) 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

 

 


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.“

 

 


Owner and operator

Rise Fjernvarme Amba (Rise District Heating)
Henning Schmidt
Kirkeballevej 10
5970 Aeroeskoebing, Denmark
Phone: +45 62 522680
hsmidt(at)dlgnet.dk

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

Technical description

 


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


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)

./.


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


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.


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


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.






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

Financing and investment

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.

 


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 %).

 


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

Development & experiences

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


Experiences technical staff

Experienced problems or failures?

Yes

­Found solutions to these problems or failures?

Yes

 

 

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

Downloads

SOLARGE_goodpractice_dk_risefjernvarme.pdf

this datasheet in printable PDF-format

611 K

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