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8/18/2019 Geothermal Energy-Heat Pump
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RENEWABLE ENERGYGEOTHERMAL ENERGY IN COMBINATION WITH HEAT PUMP
AND EXAMPLES OF PRACTICE
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© REHAU
BASIS
WHAT ARE THE ADVANTAGES OF GEOTHERMAL ENERGY?
- Domestic, ecologic source of energy
- Cosistent – independet of weather conditions, seasons and times of day
- Inexhaustible and sustainble energy source
(according to human perion)
- Using the all year round obtained geothermal energy for heating the building in winter and cooling
in summer
- Energy savings for heating up to 75% and for cooling up to 85%
- To a large extent independent of increasing the price of fossil fuels
- A significant reduction in CO2 emissions
- Facilities for the use of geothermal energy are almost invesible below the surface
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Deep geothermal (from within the ground) (> 400m)
- Hydrothermal systems (using water stores)
- Petrothermal systems (artificially pumping water deep underground)
- Deep geothermal probes (using a closed loop system)
Ground-source (from the sun) (< 400m)
- Ground-source collectors (sub-surface, at a depth of 1.5m)
- Ground-source probes (using boreholes at depths of ca.100m)- Ground-source spiral probes (spiral probes buried up to 5m deep)
- Ground-source energy piles (using the building foundations)
- Ground water bore holes (open loop systems using ground water)
- Ground-air heat exchanger (using mechanical ventilation)
INTRODUCTION WHAT TYPES OF GEOTHERMAL ENERGY ARE THERE?
300m
10m
0 m
summerwinter
Rain 13 W/m² Solar radiation
up to 600 W/m²
0,06 W/m² Geothermal heat flow
200 10
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SEASONAL VARIATIONS OF GROUND TEMPERATURE
INTRODUCTION
February
May
August
November
Temperature C
Depth
(m)
Increase of ca. 3K
per 100m depth
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BASIS
USING GEOTHEMRAL ENERGY FOR HEATING WITH HEAT PUMP
Getting of the geothemral energy
Increasing the temperaturelevel with heat pump
Underfloor heating
3 C 40 C
32 C0 C
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BASIS
USING GEOTHERMAL ENERGY FOR COOLING WITH HEAT PUMP
Giving the heat to the Earth for faster
regeneration and accumulation
Decreasing the temperature level
with heat pump
Taking the heat from the object
with underfloor heating
15 C 16 C
19 C22 C
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Best solution: Combine heating in the winter and cooling in the summer
10 C
0 C
Jan Jan
Advantages: + Faster regeneration of ground temperature
+ Rise in efficiency and heat quality
+ Utilization of free cooling
Jan
10 C
0 CJan Dec
10 C Jan Dec
Ground temperature rises during the cooling period,
requiring subsequent regeneration
Ground temperature sinks during the heating period,
requiring subsequent regeneration
WHY GROUND REGENERATION IMPROVES THE PERFORMANCE
INTRODUCTION
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INTRODUCTIONWHAT ARE THE ADVANTAGES OF GROUND-SOURCE ENERGY?
- Renewable and sustainable energy source
- Year round usage – independent from climate & season
- Reduced carbon emissions for both heating and cooling
- Can provide space heating, hot water and cooling
- No fuel deliveries required
- Low maintenance costs
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INTRODUCTIONHOW DOES A GROUND SOURCE HEAT PUMP WORK?
Ground loop (vertical / horizontal) Space heating circuit(ideally underfloor heating)
0 C
4 C
30 C
35 C
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COEFFICIENT OF PERFORMANCE OF HEAT PUMP
EFFECT OF FLOW TEMPERATURE
0
1
2
3
4
5
6
7
-5 0 5 10 15
Heating Water temp in °C
E n e r g y u s e ε
( C O P ) T = 35°C
T = 45°C
T = 55°C
C.O.P
Return temperature of ground-source circuit C
Flow temperature
of heating circuit
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Domestic applications:- Vertical probes
- Spiral / helix probes
- Coaxial probes for radial drilling
- Horizontal collectors
- Energy piles
Commercial applications:
- Vertical probes
- Energy piles
- HPR probes (up to 800m)
FOR EVERY DEMAND AN INDIVIDUAL GROUND-SOURCE SOLUTION
THE RIGHT SYSTEM CHOICE
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FOR EVERY DEMAND AN INDIVIDUAL GROUND-SOURCE SOLUTION
THE RIGHT SYSTEM CHOICE
Probe Collector Helix® Coaxial probes Energy piles
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- Higher resistance to notches and grooves - no reduction in lifespan when notches
travel 20% into the wall
- No susceptibility to point loads
- No thermal changes in properties at long periods of up to 95 C
- Higher chemical resistance over PE 100
- Lower pressure losses (PE-Xa pipe roughness 0.007mm, PE = 0.04mm)
- Improved bending radius
- Everloc compression sleeve fitting
CHOOSING THE RIGHT MATERIALADVANTAGES OF PE-Xa OVER PE 100
PE 100
PE-Xa
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Due to the high temperature resistance of PE-Xa (-40 C to 95 C), PE-Xa can be combined with solar thermalsystems.
Excess solar thermal energy in the summer can be stored in the ground to increase the COP.
PROBESCOMBINATION WITH SOLAR THERMAL ENERGY
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- Double-U probes provide built-in reliability – ‘bury and
forget’
- 2 flow and 2 return circuits
- If any probe failure occurs, still having working circuit
- Additional thermal outputs of around 10-15% per probe
PROBESDOUBLE-U PROBES
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HPR PROBESPILOT SITE PHOTOS
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COLLECTORSFOR PROJECTS WITH LARGE SURFACE AREA AVAILABLE
PE 100collectors
PE-Xa
collectors
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COLLECTORSHORIZONTAL COLLECTORS – PIPE MATERIAL OPTIONS
PE-Xa collectors:
- High resistance to notches &
grooves- Sand bed is not required
- Laying in small areas due to tight
bending radius
PE 100 collectors:
- Manufactured to DIN 8074 /8075
- Sand bed is required
PE-RC collectors:
- Manufactured to PAS 107
- Sand bed is not required
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COLLECTORSINSTALLATION OF COLLECTORS
With PE 100, a sand bed is
required
PE-Xa collectorsPE 100collectors
PE-Xa
collectors
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COLLECTORSPIPE SPACING
• Slinky systems popular due to low installation costs
• Pipes laid in coils in trenches – 0cm pipe spacing
• Can cause problems by extracting too much energy
affecting long-term GSHP performance
VDI 4640 (part 2, p13) states:
“When determining the installation distance (usually
between 0.3m and 0.8m) it must be considered that the ice
radii forming around the extraction pipes must not merge”
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HELIX PE-XaCOMPACT FORM OF ENERGY EXTRACTION
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- 4.2m deep borehole – simple to drill
- For new builds and refurbishments
- Low storage, transport and installation costs
- Expands from 1.1m to 3m
- High-quality PE-Xa material for safe installation and
long-term reliability
HELIX PE-XaCOMPACT FORM OF ENERGY EXTRACTION
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Auger drilling: Further 3m deepCreate trench 1.2m deep
HELIX PE-XaINSTALLATION PHOTOS
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Backfill = excavated material
(or sand / water if poor soil)
HELIX PE-XaINSTALLATION PHOTOS
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ENERGY PILESEXPLOITING THE BUILDING‘S FOUNDATIONS
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PE-Xa is ideal due to its small bending radius,
allowing for a simple installation.
ENERGY PILES
Concrete piles are sometimes required for stability dueto poor load-bearing soil.
Ground-source pipework can be integrated to exploit
ground-source energy.
EXPLOITING THE BUILDING‘S FOUNDATIONS
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© REHAU
Navarino Holiday Resort, Greece
Ground-source heating and cooling using
130km collect PE-Xa and 130 industrial
manifolds.
CASE STUDIES
GROUND-SOURCE SYSTEMS
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© REHAU
Kinsale Lifeboat Station, Ireland Ground-source heating using 1200m of PE-Xa pipe integrated into
structural concrete caissons, which support the building. Uses tidal
flow to extract ground-source energy.
CASE STUDIES
GROUND-SOURCE SYSTEMS
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Suffolk One College, Ipswich Used ICAX interseasonal heat transfer
system. 14,000m of 25mm PE-Xa pipe used
for solar capture and 18 x 100m PE-Xa probes
for heat storage
CASE STUDIES
GROUND-SOURCE SYSTEMS
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© REHAU
Tesco store – Greenfield, Oldham
CASE STUDIES
GROUND-SOURCE SYSTEMS
Interseasonal heat transfer with 9 x 150m probes for heating and cooling 25,000 ft² store. Recovers heat
from store in summer and stores it in ground for extraction in winter.
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© REHAU
Wellington Civic Centre Used ICAX interseasonal heat transfer system.
4,000m of 40mm PE-Xa pipe used for solar capture
and 20 x 110m PE-Xa probes for heat storage
CASE STUDIES
GROUND-SOURCE SYSTEMS
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Solar Storage Crailsheim (DE)
In one of the largest geothermal heat reserves in Germany,
the excess heat from 10,000m2 of solar collectors in the
summer is saved for use in the winter with help of 80 PE-
Xa probes.
CASE STUDIES
GROUND-SOURCE SYSTEMS
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Berkentin Bridge, Germany
Winter operation:
• Keeps the road snow and ice free - less requirement for gritting
Summer operation:
• Thermal regeneration of the ground
• Cools the asphalt surface -increasing lifespan of the road
6,300m of 25mm stabil PE-Xa pipe (with integrated aluminiumlayer) was used. Able to be laid directly in asphalt at temperatures
of up to 240 C
GROUND-SOURCE SYSTEMSCASE STUDY - BRIDGE HEATING
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Platform Heating Bad Lauterberg, Germany
Clearing of snow and ice on the platforms with ground-source
energy using collect PE-Xa and RAUGEO probes PE 100.
CASE STUDIES
GROUND-SOURCE SYSTEMS
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© REHAU
The Lakes - Yoo 6, Gloucestershire
- PE Collect laid in lakes for optimum performance
- 700m in total
- 160 luxury houses over next 3 years
GROUND-SOURCE SYSTEMSCASE STUDIES
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© REHAU
Grand Designs House, KentGround-source heating using PE-Xa energy piles.
Used with Underfloor heating
CASE STUDIES
GROUND-SOURCE SYSTEMS
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© REHAU
Commercial building „Energotehnika – Juzna Backa”
in Novi Sad
Heating and cooling with geothermal
60 PE-Xa-probes 125m,
4.000 m collect PE-Xa connecting pipes to
manifold,
1.200 m INSULPEX connecting pipes to heat pump.
Geothermal probes are in green area and underparking place.
REFERENCE OBJECTS IN SERBIA
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© REHAU
First low-energy housing building in Serbia
AMADEO, Beodom, Belgrade
Heating and cooling with geothermal energy
2x5 PE-Xa-probes 100m, 500 m collect PE-Xa
connecting pipes to manifold
Geothermal probes are under the building and in
green area.
DHW with solar system.
REFERENCE OBJECTS IN SERBIA
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© REHAU
Low-energy housing building AMADEO 2, Beodom,
Belgrade
Heating and cooling with geothermal energy –
5 RAUGEO PE-Xa-probes 100m, 250 m RAUGEO
collect PE-Xa connecting pipes to manifold
HEAT PUMP Geo 30B
RAUTHERM S panel heating and cooling
REFERENCE OBJECTS IN SERBIA
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© REHAU
Low energy housing building in Stjepana Ljubise
Street in Belgrade.
Heating and cooling with geothermal energy –
4 RAUGEO PE-Xa-probes 125m, probes are under
the bulding.
REFERENCE OBJECTS IN SERBIA
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© REHAU
Commercial building in Novi Sad 3 PE-Xa 125m probes60 m collect connecting pipes to manifold
HEAT PUMP GEO 37 BC
3500m panel heating and cooling
26 m pre-insulated pipes INSULPEX Duo 63+63/180mm
REFERENCE OBJECTS IN SERBIA
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THANK YOU FOR YOUR ATTENTION