› Projects Test version — not for commercial use
GX
Account
0Total Projects
0In Design
0Simulated
0Boreholes Placed
All Projects
Most Recent
Active Project
No project open yet
Recent Activity
Quick Keys (Design)
Place boreholeB
Draw fieldP
MeasureM
SelectV
PanH
Fit screenF
Command palette⌘K
New Project
Untitled Project Base Case Test version — not for commercial use
API
GX
Select
Place
Layout
View
Analysis
1 Find your site
Search for your location to begin — the site is where the project is; the buildings come next.
2 Site Data — GeoSphere AT
Subsurface thermal & hydrogeological properties for the map centre — feeds ground conductivity, undisturbed ground temperature, diffusivity and the groundwater model. GeoSphere Austria geothermal potential maps (EWS / GWWP). Austria only; elsewhere, set the ground properties by hand in System → Ground.
3 Weather / Climate
Typical-year air temperature & solar for the map centre — feeds air-source-HP COP, PV / solar-thermal yield and cooling sizing. PVGIS (EU JRC), global fallback Open-Meteo (ERA5).
How do you want to define the load?
No load defined
Monthly Load Profile ■ Heating ■ Cooling
Buildings edit floors, floor area and archetype
Draw a study area above to auto-detect the buildings inside it, draw a footprint by hand, or add rows to the table directly.
Archetype Floors Floor m^2 Htg kW Clg kW
Draw a study area to detect buildings
Heat Pump Model
Heating supply T
degC
Cooling supply T
degC
Hot-water supply T
degC
Operation mode
Carnot efficiency eta
-
Min EFT limit
degC
Max EFT (cooling)
degC
Compliance basis
HP Sizing
Capacity / unit
kW
No. of units
Total HP capacity 45 kW
Ground loop load - kW
HP load coverage 100%
COPh @ Tg
-
EERc @ Tg
-
SCOP est.
-
SPF est.
-
COP / EER vs Fluid Temperature
Advanced — free cooling & ground-loop HEX 0
Free Cooling
Ground Loop Heat Exchanger
HEX type
Map Actions
Building Stock
CEA Import
Available resources click to activate · 0/0
Loading resource catalogue…
Integration schematicsources → load
Activate resources to build the integration schematic.
Your energy mix
Heating
0%
Cooling
0%
Storage
0%
0sources
Share of demand

Drag a slider to weight a source; the rest re-normalise. The optimiser refines the exact split in the Size the mix step.

No resources selected yet.
Geometry
Depth
m
Spacing
m
Boreholes N
0=auto
Config
Advanced — borehole diameter, burial depth
Diameter
mm
Burial depth
m
Fluid and Pipe
Fluid Type
Flow Rate
l/s.bh
Pipe OD
mm
Advanced — pipe wall, fluid temperature
Pipe wall
mm
Fluid temp
degC
Peak power
kW
Header pipe & pump — optional
Header length
m
Header OD
mm
Pump eta
-
Flags
TRT weighting
BHE interference
Groundwater
3D end-effects
Grout
Type
Conductivity
W/mK
Vol. heat cap.
MJ/m³K
Thermal
Groundwater
Ground Layers
Effective thermal conductivity — depth-weighted average ks
W/mK
Undist. Tg
C
Advanced ground properties —
Rb
mK/W
Geotherm. grad
C/m
Alpha
m2/s
Thermal Response Test
These properties describe the ground-source heat pump's resource: they drive the g-function simulation, the ÖWAV verdict and the required field length.
Seasonal Thermal Storage
Optional module — enable to add STES to the design and run its simulation.
Seasonal Thermal Energy Storage
Technology
Volume
m³
T high
°C
T low
°C
Advanced — H/D ratio, U-value, solar area
H/D ratio
— (opt. 3–4)
U-value
W/m²K
Solar area
m² (0=auto)
Est. Capacity
—
MWh
SVR
—
m⁻¹
Est. Loss
—
%/yr
Constraints Check
Field Sizing
① Size array · here → ② Verify · Run → ③ Allocate share · Mix
Sizes the number of boreholes to meet your load & ÖWAV temperature limits (spacing is set in the Boreholes tab — you don't need to place a field). The Simulate step then verifies this array; Size the mix allocates its share of the load.
This is the one place to size the field. For advanced multi-objective refinement (cost · COP · land · carbon), use the Field Optimizer below.
View
Display
Placed boreholes0
Total depth— m
Field Optimizer — multi-objective, optional 0
Refine the borehole field — BHE type, depth, spacing — against cost, COP, land and carbon (NSGA-II / Pareto). The sensible baseline from Field Sizing is enough for most designs; reach for this mainly when the simulation fails ÖWAV or to trim cost/carbon.
Hydraulic circuits — manifold layout, optional 0
Ranks every way of dividing the field into circuits — direct return, reverse return (Tichelmann) and series strings — by pumping energy, flow balance, thermal degradation and pipe cost. The result colours the circuits on the layout drawing and adds a circuit schedule to the PDF report.
Objectivewhat to optimise the manifold for
Circuits per manifoldchamber size — fields larger than this get sub-manifolds on a trunk
Thermal Network
Optional module — enable to design a 4GDH/5GDHC network and run load coverage.
Low-Temp Thermal Network
4GDH / 5GDHC network design: temperatures, losses, hydraulics, and topology for load-coverage calculation.
Supply T
°C
Design ΔT
K
Pipe length
m (0=auto)
Heat loss coeff.
W/mK
Target velocity
m/s
STES share cap
%
Topology type
Topology goal
Design Flow
—
m³/h
Pipe ID
—
mm
Est. Loss
—
MWh/yr
Auto-route builds a DHNx-style graph topology between buildings, heat pump, storage, and borefield.
① Size array · Layout → ② Verify · here → ③ Allocate share · Mix
Verifies the ground array you sized in System → Layout over the horizon — EFT limits, SPF and ground balance. Its capacity & COP feed the Energy Mix. Closed-loop is the default; switch to open-loop for groundwater wells.
Next: once this completes, ② Energy Mix dispatches your whole resource mix, then ③ Analyse gives cost & carbon.
Setup & loop model
Solver
Horizon
years
Resolution
Load Profile
—
Loop mode
System schematic
Ground Building HP Heat pump Borehole heat exchangers closed-loop vertical BHE (≤ 300 m)
Warm to building Cool return Ground loop · down Ground loop · up
Representative schematic — the heat pump moves heat between the building and the ground loop.
Advanced — g-function method 0
G-Function Method
FDM computes a project-specific g-function at high (reference-grade) accuracy. Run once per field. Takes ~90–150 s.
LCC (VDI 2067)
Country / Region
Analysis period yr
Discount rate %
CAPEX (GSHP)
Drilling cost EUR/m
HP unit cost EUR/kW
Distribution EUR
Total CAPEX -
Subsidy
Grant rate %
Grant cap EUR
Energy Prices (Year 1)
Electricity EUR/kWh
Elec. escalation %/yr
Advanced — reference systems & day-ahead tariff 0
Natural gas EUR/kWh
District heat EUR/kWh
Variable el. price
DA strategy
DA year year
DA path
Buy surcharge c/kWh
Buy surcharge (Stop) c/kWh
Buy multiplier x
Feed-in discount c/kWh
Gas escalation %/yr
Reference Systems
Boiler efficiency %
CO₂ levy EUR/tCO2
Energy Mix · System dispatch
Dispatches the resources you chose in System across the load — optimal shares, least cost/carbon, with storage & the ground loop. —
Country
Objective
Engine
Horizonyr
Demand will use the last simulation when available.
Resources
Resources, shares & limits are set per-resource in System. This step dispatches that mix.
Constraints (optional)
Ground-loop role
Min ground share
%
Advanced — caps, balance, site potential 0
Resolution
Max CO₂
t/yr
Max budget
k€
Balance borefield
±%
Site potential
Solar area
m²
Solar yield
kWh/m²yr
Leave blank for no limit. GSHP is auto-capped at your simulated borefield capacity. Solar area × yield limits PV/solar-thermal to what fits on site. Air-source-HP COP is set on its design page (System → Air Source HP). If limits can't be met, the optimizer reports infeasible.
LCA (EN 15978)
LCA period yr
Transport distance km
Phase 1 uses Austria-aligned generic embodied factors. Country selection changes the operational electricity mix. This is suitable for concept design and option ranking, not certified reporting.
Awaiting simulation
Optimize Design
Run quick field sizing, Pareto optimization, or a combined quick baseline plus Pareto refinement from one workflow.
Workflow
Source Technologies
Selected technologies are evaluated by both quick sizing and Pareto refinement with their own Rb, cost, radius, and depth limits.
Objectives
Primary ranking
Priority: Minimum LCOE -> Maximum COP -> Minimum drilling cost -> Minimum land use -> Maximum renewable fraction
Design Variables
Depth range
80-300m
Spacing range
4-12m
Max field rows
4
STES volume
2500m3
HP capacity
Panel
Algorithm
Method
Evaluations

Quick sizing applies a baseline design first; Pareto refinement then populates Optimization Results.

Run Status
Run simulation to populate results.
System Summary
Detailed thermal results are listed in the table. Hydraulics populate after simulation and pipe sizing.
Component Type Depth COP Yield/yr Peak kW Min EFT Max EFT Status
Run simulation to populate results.
OeWAV 207
Min EFT: -
Mean T: -
Max EFT: -
Max mean T: -
Spec. power: - W/m heat / - W/m cool Delta T ground: - K
Contour Settings

Soil temperature contours are generated from the last simulation. Use Regenerate after changing the field or year.

Ground Profile
Annual Energy Flow
Run Network Simulation (System → Network) to see load coverage results here.
Load Coverage
Load Coverage — Line
Monthly Supply Breakdown
Building Demand Profile
Optimization Results
Configure objectives and design variables in the Run -> Optimize tab, then run Pareto optimization to see the tradeoff front here.
Click a point on the Pareto chart to inspect the solution.
-
GSHP Net CAPEX
after subsidy
-
Annual LCC
GSHP annuity
-
NPV Savings
vs gas boiler
-
Simple Payback
vs gas boiler
-
CO₂ Saved
vs gas (t/yr)
Annual Cost Breakdown - VDI 2067 (EUR/yr, annuity method) OeNORM M 7140 / VDI 2067
Cumulative Cost Comparison (nominal, over analysis period)
Cost Component Breakdown (annualised, EUR/yr) -
Cost Component GSHP Gas Boiler District Heat GSHP Savings vs Gas
Run LCC Analysis to see results
Methodology: VDI 2067 Blatt 1 & 6 / OeNORM M 7140 / EN 15459-1 (annuity method). Sources: AEA-Kostencheck 2024, GeoBoost D2.1 (EGEC/TU Munich 2024), Fraunhofer ISE Ariadne 2024, Bundesnetzagentur 2024, E-Control AT 2024, BAFA BEG 2025.
Run Energy Mix optimization to populate dispatch, cost, carbon, and Pareto results.
Optimized mix — the shares (Heat %, Hot water %, Cool %) and capacities (kW) below were chosen automatically by the optimizer to minimize your objective.
ResourceHeat %DHW %Cool %kWCAPEXOPEX/yrNPVtCO2/yr
No energy mix results yet.
Run the optimiser in the Size the mix step to see a per-resource dashboard.
-
Total GWP
tCO2e over study period
-
Specific GWP
gCO2e per kWh useful heat
-
Embodied Share
A1-A3 plus A4
-
Operation Share
B6 electricity
-
PENRT
MWh primary energy
Impact Story
Awaiting LCA
Run LCA to identify the dominant lifecycle impact.
The summary will explain whether impacts are dominated by embodied materials or electricity use, and which component group drives the footprint.
Top Hotspot
-
Annual Elec
-
Reference
-
Embodied vs Operation
Top Component Hotspots
Component LCA Breakdown Run simulation and LCA to populate
Component Group Quantity GWP Share Repl.
Run simulation and LCA to see results
Phase 1 LCA scope: source field, heat pump plant, storage, network, replacements, and operational electricity. Dataset: Austria-aligned generic factors for early-stage comparison.
Run a STES simulation (System → STES) to see results here.
Run a simulation with cooling loads enabled to see free-cooling analysis.
Future-Climate Stress Test

The ground-loop simulation repeats one 12-month load profile for the whole design period, so the design is verified against a climate that never changes. This re-runs the same field under warmed climates and reports when the ÖWAV verdict changes. A sensitivity study, not a projection.

Pathway
Percentile
Horizon
What do these pathways and percentiles mean?
Loading…
Advanced assumptions
Ground coupling
Daily T sigma (K)
Hold DHW constant
Runs the simulation once per scenario — a full matrix is 31 runs.
Scenario Comparison

Save the current design as a scenario, change something (borehole count, depth, or the energy mix), save another, then compare them side by side — sources, depth, SPF/COP, renewable share, CAPEX, LCC/yr and 25-yr CO₂.

Saved Scenarios
No scenarios saved yet.
Run a simulation and save it as a scenario.
Branding
Project
Name—
Location—
Designer—
PDF Options
Advanced — report contents & sheets 0
PDF Contents
Excel Sheets
Report contents
Tick the sections to include in the PDF.
Boreholes —
Total Depth
— m
SPF —
EFT min
— °C
EFT max
— °C
Map
Layout
Charts
Contours
Profile
Energy Flow
Geology
Demand
Buildings 3D
-
+
Design Canvas Ready
Place elements to build your geothermal layout
N
Subsurface Analysis
Study Area
-
Building Footprints
-
0 buildings found . 0 excluded
Available Subsurface Space
-
Building
Excluded
Usable Space
Borehole Field 0 BHEs
Auto-Fill Available Space
Spacing m
Pattern
Max BHEs
Predefined Field Shape
Shape
Spacing m
Rows Cols
— select a shape —
Depth (m) Radius (m)
0
Boreholes
-
Avg. Spacing (m)
-
Total Length
-
BHE / ha
Borehole placement active - click map to place . Esc to stop
Fetching buildings
from OpenStreetMap...

Subsurface Cross-Section

Total Depth150 m
Boreholes7
Ground Temp8.5 C
Layer 1Sand 0-30m
Layer 2Clay 30-80m
Layer 3Granite 80m+
Drag to rotate
50 m
X: 0.0 m | Y: 0.0 m
BHE (20 units)
STES (2 units)
Network (1415 m)
Use the toolbar to switch to Layout view, or click System → Layout.
Charts are shown in the canvas area (Results → Charts tab).
Contours are shown in the canvas area.
Ground profile is shown in the canvas area.
Energy flow (Sankey) is shown in the canvas area.
Run LCC analysis to see results here.
Run LCA analysis to see results here.
STES results shown after simulation.
Free cooling results appear here after simulation.
Load coverage results shown after simulation.
Pareto front shown after optimization.
Report
Table of Contents
9 of 9 sections
Report not yet generated
Run a simulation, then click Refresh to render the live report preview.
Scenario Comparison Compare:
No scenarios to compare
Run simulations and save them as scenarios in the Project Manager, then return here to compare results side by side.
Console
Console
Import CSV Load Profile
CSV Format
Monthly (12 rows)
Hourly (8760 rows)
Monthly format - one row per month, columns:
month, heating_W, cooling_W
or:
month, heating_kW, cooling_kW (auto-detected)

Example:
month,heating_W,cooling_W
1,42000,0
2,38000,0
...
12,35000,0

Header row is optional. Values can be W or kW - detected automatically.
Column order: month (or index), heating, cooling.
CSV
Drop CSV file here or click to browse
.csv or .txt . UTF-8 . comma, semicolon or tab separated
Preview -
JanFebMarAprMayJun JulAugSepOctNovDec
-
Peak Heating
-
Peak Cooling
-
Annual Heating
-
Annual Cooling
Project Manager
Save Current Project
Saved Projects
New Design
Choose what to clear from the canvas
Clear Everything - New Blank Canvas
Removes boreholes, pipes, STES, buildings and plume effects
Or clear specific layers
Clear Boreholes
Remove borehole markers only
Clear Network Pipes
Remove all pipe segments and connections
Clear Storage Units
Remove STES and heat pump components
Clear Buildings
Remove the building footprint overlays (Block A, Office B...)
Start New Project?

This will clear everything - map layers, boreholes, buildings, loads and all simulation results.

Save your current work first if you want to keep it.

Auto-Size Borehole Field
Min Depth (m)
Max Depth (m)
Spacing (m)
Available Area (m^2)
Simulation Horizon (yr)
Load (from Demand step)
—
Vertical BHE Types
Single U-pipe
Double U-pipe
Coaxial
Inclined Single U
Inclined Double U
Energy Pile
Deep Coaxial (>500 m)
Shallow Slinky
Deep Spiral
Oval Borehole
Separatus
Water-Filled
Horizontal GHE Alternative (no deep drilling required)
Slinky-Coil
Linear-Loop Trench
Trench Depth (m)
Coil Diam. (m)
Coil Pitch (m)
Available Area (m^2)
GSS Assistant
Context-aware geothermal AI
Context: BHE LCC LCA STES Network
—

What the app assumed for you

The tool's principal defaults, plus every value it substituted or fell back on after a lookup failed. Each is defensible — but you should know it is there. This is not an exhaustive inventory of every input left at its shipped value.