Modules
GLN Analysis features and specifications
GLN Analysis version 3.0 answers the four questions a ground loop network is judged on: (1) does every borehole get its share of the flow, (2) is that flow turbulent at the heating peak, (3) is each pipe the right size, and (4) what head must the circulating pump supply.
500 boreholesborehole field solved interactively, in milliseconds
40reference verification scenarios
49pipe catalogue entries, metric and imperial
35component types in the drawing palette
Version 3.0| Drawing & Modelling | |
| Diagram-driven modellinga node per component, an edge per pipe | ✓ |
| Component types in the paletteactive, passive, thermal, instrumentation, storage | 35 |
| Valve, exchanger and heat-pump genres, each with its own symbol and default K | ✓ |
| Ready-made archetypes shipped with the module | 4 |
| Ground heat exchanger generatorsingle-U, double-U, coaxial; parallel or series | ✓ |
| Reusable archetypes with thumbnails | ✓ |
| Independent networks in one drawing, each with its own fluid, flow rate and temperature | ✓ |
| Result maps drawn on the network itselfpressure, velocity, head, elevation | 4 |
| Hydraulic Solver | |
| Newton-Raphson mass balance at every free node | ✓ |
| Darcy-Weisbach distributed losses, Swamee-Jain friction factor | ✓ |
| Minor losses as K·ρv²/2 | ✓ |
| Piezometric head formulationgauge pressure plus ρg·z | ✓ |
| Sparse Jacobian, pattern analysed interactively | ✓ |
| Solution recalculated interactively, in a few milliseconds | 500 boreholes |
| Pumps | |
| Pump slots, each with its own H-Q points and efficienciesseeded as a size ladder, meant to be replaced by the curve of the pump specified | 5 |
| Curve completed to the shutoff head and the runout flow | ✓ |
| Separate hydraulic and motor efficiencies | ✓ |
| Operating point — flow, head, fluid power and electrical draw | ✓ |
| Control modesconstant speed, constant head, imposed flow | 3 |
| Fluids & Pipes | |
| Heat carrier fluids through the Melinder correlations | 5 |
| ρ and µ evaluated at each network's own temperature | ✓ |
| Pipe entries28 metric DN and 21 imperial IPS, SDR 9 / 11 / 17 | 49 |
| Design Checks & Diagnostics | |
| Velocity window checked per pipem/s | 0.3 – 2.5 |
| Friction gradient window checked per pipePa/m | 100 – 400 |
| Reynolds number and flow regime, per pipe | ✓ |
| Balancing indicatorhighest to lowest borehole loop flow | ✓ |
| Results & files | |
| Guided analysis-tree workflow | ✓ |
| Per-pipe and per-node results tablessortable, with the three advisory checks in the cell they judge | ✓ |
| Unified project filedrawing, pumps, fluid and project record, shared with the GHE and TRT modules | .ghe |
| Reusable pipework archetypessaved from a selection, inserted from a thumbnail gallery | .hya |
| High-resolution capture of the active viewanimated GIF while the flow animation runs | PNG |
| Verification | |
| Reference scenarios | 40 |
| Cross-checked against an independent solverEPANET 2 | ✓ |
| Worked examples of the reference textbook reproduced | ✓ |
| Analysis Suite | |
| Modules in one applicationTRT interpretation, GHE design, GLN hydraulics | 3 |
| Parameters carried from one module to the nextTRT → GHE → GLN, choosing which technique's value travels | ✓ |
| Documentation | |
| Illustrated user manual written for this module9 figures | 33 000 words |
| Read inside the application, as a PDF, and onlineno registration | ✓ |
| Context help on every panel, opened from the panel itself | ✓ |
| Quick-start walkthrough of a complete analysis | ✓ |
| Linked reference section — every method traced to its publication | ✓ |
| Specifications | |
| Operating system | Windows 10+, macOS 26+ |
Why the pump head matters
The fourth question determines the energy efficiency of the installation, because the pumping power is subtracted from the benefit of the system for its whole service life. GLN Analysis answers the four questions on the network drawing itself, and updates the answers as the design changes.
Where each line is documented
See the documentation hub · Free for research and teaching · See pricing
Every feature above is in the demo, with limited input ranges. No registration.