RENEWABLE ENERGY GEOTHERMAL ENERGY IN COMBINATION WITH HEAT PUMP AND EXAMPLES OF PRACTICE
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1 RENEWABLE ENERGY GEOTHERMAL ENERGY IN COMBINATION WITH HEAT PUMP AND EXAMPLES OF PRACTICE
2 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
3 INTRODUCTION WHAT TYPES OF GEOTHERMAL ENERGY ARE THERE? Deep geothermal (from within the ground) (> 400m) Rain 13 W/m² Solar radiation up to 600 W/m² - Hydrothermal systems (using water stores) - Petrothermal systems (artificially pumping water deep underground) - Deep geothermal probes (using a closed loop system) 0 m 0 10 winter 20 summer 10m 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) 300m 0,06 W/m² Geothermal heat flow
4 INTRODUCTION SEASONAL VARIATIONS OF GROUND TEMPERATURE Temperature C February Depth (m) May August Increase of ca. 3K per 100m depth November
5 BASIS USING GEOTHEMRAL ENERGY FOR HEATING WITH HEAT PUMP 3 C 40 C 0 C 32 C Increasing the temperature level with heat pump Underfloor heating Getting of the geothemral energy
6 BASIS USING GEOTHERMAL ENERGY FOR COOLING WITH HEAT PUMP 15 C 16 C 22 C 19 C 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
7 INTRODUCTION WHY GROUND REGENERATION IMPROVES THE PERFORMANCE Ground temperature sinks during the heating period, requiring subsequent regeneration 10 C 0 C Jan Dec Ground temperature rises during the cooling period, requiring subsequent regeneration 10 C Jan Dec Best solution: Combine heating in the winter and cooling in the summer 10 C 0 C Jan Jan Jan Advantages: + Faster regeneration of ground temperature + Rise in efficiency and heat quality + Utilization of free cooling
8 INTRODUCTION WHAT 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
9 INTRODUCTION HOW DOES A GROUND SOURCE HEAT PUMP WORK? Ground loop (vertical / horizontal) Space heating circuit (ideally underfloor heating) 35 C 4 C 0 C 30 C
10 Energy use ε (COP) EFFECT OF FLOW TEMPERATURE COEFFICIENT OF PERFORMANCE OF HEAT PUMP C.O.P Flow temperature of heating circuit T = 35 C T = 45 C T = 55 C Heating Water temp in C Return temperature of ground-source circuit C
11 THE RIGHT SYSTEM CHOICE FOR EVERY DEMAND AN INDIVIDUAL GROUND-SOURCE SOLUTION 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)
12 THE RIGHT SYSTEM CHOICE FOR EVERY DEMAND AN INDIVIDUAL GROUND-SOURCE SOLUTION Probe Collector Helix Coaxial probes Energy piles
13 CHOOSING THE RIGHT MATERIAL ADVANTAGES OF PE-Xa OVER PE 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 PE-Xa - Higher chemical resistance over PE Lower pressure losses (PE-Xa pipe roughness 0.007mm, PE = 0.04mm) - Improved bending radius - Everloc compression sleeve fitting PE 100
14 PROBES COMBINATION WITH SOLAR THERMAL ENERGY Due to the high temperature resistance of PE-Xa (-40 C to 95 C), PE-Xa can be combined with solar thermal systems. Excess solar thermal energy in the summer can be stored in the ground to increase the COP.
15 PROBES DOUBLE-U PROBES - 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
16 HPR PROBES PILOT SITE PHOTOS
17 COLLECTORS FOR PROJECTS WITH LARGE SURFACE AREA AVAILABLE PE-Xa collectors PE 100 collectors
18 COLLECTORS HORIZONTAL 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 / Sand bed is required PE-RC collectors: - Manufactured to PAS Sand bed is not required
19 COLLECTORS INSTALLATION OF COLLECTORS PE-Xa collectors PE 100 collectors PE-Xa collectors With PE 100, a sand bed is required
20 COLLECTORS PIPE 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
21 HELIX PE-Xa COMPACT FORM OF ENERGY EXTRACTION
22 HELIX PE-Xa COMPACT FORM OF ENERGY EXTRACTION - 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
23 HELIX PE-Xa INSTALLATION PHOTOS Create trench 1.2m deep Auger drilling: Further 3m deep
24 HELIX PE-Xa INSTALLATION PHOTOS Backfill = excavated material (or sand / water if poor soil)
25 ENERGY PILES EXPLOITING THE BUILDING S FOUNDATIONS
26 ENERGY PILES EXPLOITING THE BUILDING S FOUNDATIONS Concrete piles are sometimes required for stability due to poor load-bearing soil. Ground-source pipework can be integrated to exploit ground-source energy. PE-Xa is ideal due to its small bending radius, allowing for a simple installation.
27 GROUND-SOURCE SYSTEMS CASE STUDIES Navarino Holiday Resort, Greece Ground-source heating and cooling using 130km collect PE-Xa and 130 industrial manifolds.
28 GROUND-SOURCE SYSTEMS CASE STUDIES 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.
29 GROUND-SOURCE SYSTEMS CASE STUDIES 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
30 GROUND-SOURCE SYSTEMS CASE STUDIES Tesco store Greenfield, Oldham 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.
31 GROUND-SOURCE SYSTEMS CASE STUDIES 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
32 GROUND-SOURCE SYSTEMS CASE STUDIES Solar Storage Crailsheim (DE) In one of the largest geothermal heat reserves in Germany, the excess heat from 10,000m 2 of solar collectors in the summer is saved for use in the winter with help of 80 PE- Xa probes.
33 GROUND-SOURCE SYSTEMS CASE STUDY - BRIDGE HEATING 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 aluminium layer) was used. Able to be laid directly in asphalt at temperatures of up to 240 C
34 GROUND-SOURCE SYSTEMS CASE STUDIES 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.
35 GROUND-SOURCE SYSTEMS CASE STUDIES The Lakes - Yoo 6, Gloucestershire - PE Collect laid in lakes for optimum performance - 700m in total luxury houses over next 3 years
36 GROUND-SOURCE SYSTEMS CASE STUDIES Grand Designs House, Kent Ground-source heating using PE-Xa energy piles. Used with Underfloor heating
37 REFERENCE OBJECTS IN SERBIA Commercial building Energotehnika Juzna Backa in Novi Sad Heating and cooling with geothermal 60 PE-Xa-probes 125m, m collect PE-Xa connecting pipes to manifold, m INSULPEX connecting pipes to heat pump. Geothermal probes are in green area and under parking place.
38 REFERENCE OBJECTS IN SERBIA 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.
39 REFERENCE OBJECTS IN SERBIA 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
40 REFERENCE OBJECTS IN SERBIA 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.
41 REFERENCE OBJECTS IN SERBIA Commercial building in Novi Sad 3 PE-Xa 125m probes 60 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
42 THANK YOU FOR YOUR ATTENTION
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