Case study | Decin district heating |
Description | Decin, a city with around 55 000 inhabitants uses geothermal energy, special heat pumps and a CHP on natural gas. In the soil near Decin is an underground water reservoir with a temperature of 30 °C. This water is used directly for a swimming pool. For district heating the temperature is too low. Therefore two heat pumps extract heat from it and warm the water for district heating up to 72 °C. |
Region>City>location | Decin |
Owner | MVV Energie CZ Co. (shareholder 96,90%) Decin municipality (3,10%) |
Operator | TERMO Decin Co. |
Installed capacity ( MWth) |
104 |
Installed geothermal capacity | |
DH length (m) |
18.890 |
Inhabitants connected | 4687 households,4 kindergartens, 2 elementary schools, 5 mediacla centers, 2 zdravotních středisek 2 nursing homes |
Design of the DH | pre-isolated tubes DN 350 – 25 |
subsurface and surface technical schemes |
subsurface design without channels |
significant pictures if any | |
Operating Temperature of the DH | 110/50°C |
Temperature of the geothermal ressource (production – injection) |
30°C |
Geothermal flow rate |
max. 54l/s |
Heat Pump if any (power in Mwe and COP) |
2 units, each of them: heating power: …..3 283 kWt consumption:…..962 kWe COP – 3,41 |
Production of heating and/or cooling | heating-warming in Heat pump from 55 up to 72°C |
Others uses (drinking water, cascade uses…) |
treated for drinking water |
Dates of begining and end of construction | Oct 2000/Oct 2002 |
Planing of the operation (from pre-studies to full completion) |
borehole for a heating plant in 1998, verification of the flow rate, temperature (30°C) and pressure (0,35 MPa) |
Organisational scheme | _ |
Administration scheme | _ |
Investement for geothermal well |
approx. 530 mil. CZK |
Investement for geothermal heating station |
|
Investement for DH network and substation |
|
Financing (banks, funds, PPP…) |
MVV Energie CZ Co. capital, investment loan of 274 mil. CZK provided by HVB Bank Czech Republic and grant of the Kingdom of Denmark in the amount of 30 mil. CZK. State Environmental Fund of the Czech Republic contributed to partially cover the interests on the investment loan. |
Amount of Subsidies if any |
30 mil. CZK |
Difficulties faced | aggradation of heat pump exchangers, treated water reveals high calcium amount |
Administrative permits | Water use permit |
Cost of the produced MWh | _ |
Cost of the MWh sold | 607,41 CZK (VAT excluded) |
Comparison with fossil energies | more expensive and complicated operation |
Final energy cost structure | _ |
Taxes | _ |
Pay back | |
Innovation if any | regular heat pump repairing |
Engineering |
Decin district heating
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