Environment and use of ground geothermal energy in Estonia Argo Jõeleht
Mar 27, 2015
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
8 .1
9 .1
9 .29 .5
9 .7
8 .9
1 0 .9
11 .71 3 .1
11 .2
1 2 .7
7 .9
1 0 .71 0 .5
9 .1
11 .3
11 .0
1 0 .0 1 0 .0
11 .5
1 0 .6
Te m p e ra tu re a t 2 5 0 m d ep th
1 0 .6
9 .9
11 .0
9
10
11
11
111 3
141 2
1 0
9
1 3 .5 C a lc u la te d te m p e ra tu re , °C
L E G E N D
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
0
200
-200
-400
-600
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!
0
5000
10000
15000
20000
25000
30000
2001 2002 2003 2004 2005 2006 2007 2008 2009 2010
Air source heat pumps
Ground source heat pumps