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Reliability and Accuracy in planning yourgeothermal energy projects

geoSIM – your tool for simulating and sizing

12/08/2016geoKOAX GmbH - www.geokoax.comSlide 2

of borefields with geoKOAX

Simulation tool to assist geologists, construction planners,

architects, drilling companies and heating and/or cooling

engineers.

For easy and quick planning of any size of geothermal ground

heat exchanger systems – from small systems with only few kW

up to complex large-scale systems including District Energy

Systems (DES).

Tool tests and analyzes the variables between the required

heating and cooling capacities, peak and base loads, ground

conditions, heat exchange fluid requirements and probe lenghts

and spacing.

Allows for the inclusion of Thermal Response Test (TRT) results

and to control the simulatin process with individual borehole

resistance values.

The tool‘s easy and intuitive user interface and its quick calculating times help reduce your daily workload and are

customizable for your individual needs.

Why geoSIM?

12/08/2016geoKOAX GmbH - www.geokoax.com

The transient performance of our coaxial probe can not be represented by GLD

Volume storage system and turbulence generator

allows for storing geothermal energy on a long-term

basis.

Effects of the volume storage:

higher flow temperature

a decoupling of the heat pump from the ground

dynamical behavior in the intermittent operation

Slide 3

A new generation of ground heat exchanger


geoKOAX – honored multiple times for the outstanding innovation.

Patented storage technology with passive turbulance:

More than six times more volume of heat carrier fluid – serves as energy

storage.

Approx. 60-70 % higher performance

(kW per meter drilled) than conventional Single U-bend systems.

Optimizes the temperature behavior in the intermittent operation and

increases the efficiency of the heat pump (COP).

Up to 70 % less probe meters (vs. Single U-bend) with correspondingly

lower overall drilling costs and material costs resulting in less time

expenditures with significantly higher return on investment (ROI).

Overall installed costs (large-scale projects) are reduced up to 35 %.

Due to higher source power there is a reduction of power consumption of

the heat pump and hence, less operating costs.

Slide 4

Results and comparison with U-BendsTabular view

Conditions U-Bend geoKOAX coaxial probe

Thermal conductivity λground 3.5 W/(m K)

Duration of extraction cycle ∆textraction 45 min

Yearly heat extraction Qheat 10,125 kWh/a

Length (depth) 95 m 50 m

Borehole resistance RB 0.14 mK/W 0.05 mK/W


Source: ROM Technik Ltd. & Co. KG

Slide 5

Results and comparison with U-BendsGrafical view 50 m geoKOAX versus 95 m Double-U-Bend


Source: ROM Technik Ltd. & Co. KG

Coaxial probe

2U-probe

Coaxial probe

2U-probe

Time in years Time in hours

Te

mpera

tur

reactio

nin

K

Te

mpera

tur

reactio

nin

K

Reference value of the Association of German Engineers for base load: 11K

Reference value of the Association of German

Engineers for peak load: 17K

Slide 6

Result of interdisciplinary project of institutes


Modeling: Modelica & Dymola

Modelica is an object-oriented, declarative,

multi-domain modeling language for

component-oriented modeling of complex

systems

Dymola: is a commercial modeling and

simulation environment based on the open

Modelica modeling language.

Research at institute of engineering

thermodynamics, Hamburg (TUHH):

‚Development and verification of models for

several probe types and a probe field with

modelica‘

Customization and verification

Special techniques of model reduction -

minimation of computing time from many

minutes to a few seconds

Verification of results by comparing with

empirical data from running monitoring

Matching with TRTs and results from EED

User interface

Display of simulation on the web server

Optimization of usability

User support and tracking of user

experience

Slide 7

Hydraulic model (for short term profile)

Vertical connection between fluid

volume models

Horizontal connection with heat

conductivity and capacity models

Simplified modelling

(for better performance)

o

o

o

o

o

o

o

o

oInner pipes Outer pipes Filling

12/08/2016geoKOAX GmbH - www.geokoax.comSlide 8

Comparison Thermal Response Test (TRT)

Source: Thermal Response Test (TRT), TEWAG - Technologie - Erdwärmeanlagen - Umweltschutz GmbH


Time (hours)

Te

mp

era

ture

(de

gre

ec

els

ius

) Temperature development TRT

Evaluation range

Regression (logarithmical)

New - geoSIM

Slide 9

A wide range of design and planning options


for all energy load requirements and circumstances

www.geokoax.de/en

Registration

Start and customize your projects

geoSIM simplifies your work and

offers reliability!

Register and access geoSIM –

free of charge for the first year.

Reliability and accuracy in planning your geothermal energy projects – project calculation, management and

archiving at the same time.

Slide 10

https://simulation.geokoax.de/en

Start a new project – input parameters


Project dataname, description, project leader

Start calculation

Heatingheat pump, heat requirements

Coolingcooling machine and requirements

Calculation period

Ground Probethermal conductivity, heat flow, density probe installations, resistance, brine fluid

calculation period of model

Slide 11

Thermal simulation of probe fields


Predictive calculations of thermal borefields over a duration of 25 years

Slide 12

geoSIM – start now


www.geokoax.de/en

Slide 13

https://simulation.geokoax.de/en

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