International Congress ENERGY AND ENVIROMENT 2004
GEOTHERMAL WATER AS AN
ENERGY SOURCE IN THE
MORAVSKE TOPLICE
GEOLOGICAL SYSTEM
NATAŠA GERIČ1,
STANISLAV SRAKA2, JOŽE PEZDIČ1
of Ljubljana, Department of Geology, Aškerčeva 12, Si1000 Ljubljana
2Development Agency SINERGIja, Moravske Toplice , Kranjčeva 3, Si9226 Moravske Toplice
1University
Geothermal energy is widely used all over the world
for different purposes such as (energy production,
house heating, geothermal baths, fish and plant
production,…).
In Slovenia 65 % of all
geothermal potential is stored in
NE part called Prekmurje.
There are two different termal
water sources:

Lower temperature system
with temperatures ranging from
30-70 °C ( exploited )

High temperature system
with temperatures ranging from
180-200 °C ( not used )
There are 6 geothermal wells in the Moravske Toplice spa
system from which thermo mineral water is produced.
Well
Depth (m)
Build in
year
Geothermal
water layer
1963
Flow
(l/s)
2.5
Mt-1
1417
Mt-2
1397
1986
3.3
Mura
formation
Mt-4
1467
1974
4
Mura
formation
Mt-5
1467
1980
4
Mura
formation
Mt-6
1000
1982
21
Termal 1
Mt-7
1360
1995
7.6
Termal 1
Mura
formation
Conditions for geothermal water exploitation:
-
high geothermal gradient of the exploitation area
good production characteristics of the geothermal water layer
appropriate geochemical characteristics of the geothermal water
short distance form the well and the consumer
• Geothermal water well and
degassing pump in Moravske
Toplice. Behind it can be seen
the water steam of the
geothermal "waste" water with
T=35°C.
Chemical characteristics of the
geothermal water
• Water from the wells Mt-1,
Mt-4 and Mt-5 contain
higher values of organic
substances
• Water from the wells Mt-2,
Mt-6 and Mt-7 is almost
without organic substances
• Wather from all wells
contain higher values of the
sulphur, methane, CO2 and
CaCO3
• CO2 helps water to
erupt (gas uplifting)
• Excess of CaCO3 is
precipitated and
removed from
geothermal water
• Methane and
hydrogene sulphide
are not treated
separately
GEOTHERMAL ENERGY
OUTPUT
Q = m * DT / 0,86
DT - temperature difference
(K)
 m - water flow (m3/day)
0,86 – constant
Energy output from all
wells is:
4,691 MW/h
Yearly energy amount from the
geothermal sources in Moravske
Toplice is equal to energy from
cca. 5345 tons of heating oil.
CURRENT GEOTHERMAL ENERGY
USE
• 70 °C geothermal
water exits the wells
• 28°C geothermal
water flow into the
stream as “waste
water”
1. Heat exchangers,
Tdrop=55-60 °C
2. Cooling pools,
Tdrop=30°C–waste
water
3. Swimming pools,
Tdrop= 28°C-waste
water
4. Greenhouses,
Tdrop=28°C-waste
water
Optional energy production by
»Cascade method«
Water temperature range: T= (10-80 °C)
• heat exchangers
• air pre heating
• during the summer air
cooling
• greenhouses heating
• fish farms
• grass watering during
summer
• energy from heat pumps
• mushrooms production
Vegetables production in greenhouses during
the winter. Geothermal water is circulating
through water pipes and produces heat energy.
Other possible uses of geothermal water
which could be explored from geothermal
water
• CO2 could be used for
better plants growth in
the greenhouses
• CO2 prevent CaCO3
precipitation and saves
heat exchangers pipes
• CO2 production
• energy production from
methane
• healthy minerals
CONCLUSIONS
Geothermal water from Moravske Toplice should be used
properly :
- to avoid unnecessary enviromental damages (CO2 exhalations, hot
water dispose,…)
- to keep thermal aquifer in balance by using the right methodes of
exploatation (constant exploatation, right capacity,…)
- by using geothermal energy during all seasons of the year (lower
costs)
More effective use of geothermal water by using
"Cascade method"
1.
2.
3.
4.
5.
6.
CO2 and Methane separation
Heating energy from heat
exchangers (50-70°C water)
Swimming pools water
heating
Direct greenhouse heating
Fish farms
Heating energy from heat
pumps (10-20°C water)
Other possible usses of geothermal
water:
THANK YOU FOR YOUR
ATTENTION !