Environment and use of ground geothermal energy in Estonia
description
Transcript of Environment and use of ground geothermal energy in Estonia
Environment and use of ground geothermal energy in
Estonia
Argo Jõeleht
0 20 40 60 80 100 km
BA
LTIC
SEA
G ULF O F FINLAND
11 .21 5 .011 .7
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Te m p e ra tu re a t 2 5 0 m d ep th
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1 3 .5 C a lc u la te d te m p e ra tu re , °C
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1 4 .3 M e a su re d te m p e ra tu re , ° C
Estimated number of installations presently• All heat pump systems
>30,000
• Ground source heat pumps 6500 – 8000
• Borehole-based systems 100 – 200
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North South
Example of closed loop system
• North Estonia near Tallinn
• Built in 1994• Two wells (150 m and
144 m)• One for geothermal
purpose, the other one for groundwater
Monitored temperatureson heating seasons 14 – 17
Example of open loop system
• Oisu village, Central Estonia
• Built in late 1990s
• 2 wells (à 10 m)
• Distance between wells 18 m
• HP power 22 kW (+18 kW since 2009)
Open system in central Estonia
co-effect of two heat pumps
Summary• Geothermal applications are mostly based on
horisontal loops
• Until now it is difficult to get drilling permissions for borehole-based applications
• There are technology to build ground coupled heat pump systems with minimum risk
• Situation with borehole-based applications is changing, but still a lot of explaining is needed to increase the knowledge base at all levels
Thank you!
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15000
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30000
2001 2002 2003 2004 2005 2006 2007 2008 2009 2010
Air source heat pumps
Ground source heat pumps