Trial examples
Every EngineerLM deployment is seeded with the published reference cases as real studies: a study, an immutable input snapshot and a recorded execution each, produced through the same durable path your own calculations take. They are not screenshots of a demo - they are stored records you can open.
These worked examples are independently authored EngineerLM reference cases. The engineering libraries used by the service have their own notices:
Current distribution engineering-stack notices; not historical execution-version evidence.
- coolprop 8.0.0 (MIT)
- ht 1.2.0 (MIT)
- fluids 1.3.1 (MIT)
- pandapower 3.5.4 (BSD-3-Clause)
- tespy 0.11.2 (MIT)
Sign in to open the stored records. Here is the worked example itself, in full, from the published reference case - the same numbers those records contain.
The worked example: pump, motor, feeder
One call to pump_motor_feeder carries a single
steady-state duty point from the liquid piping to the electrical supply,
dispatching 8 steps to other registered tools
and recording all of it as one execution. Reference case
wf-pmf-si-001,
graded against hand arithmetic at 1e-09 relative
tolerance on every row below. Textbook-style data: no
customer, site or project information in it.
Inputs, in part
| Input | Value | Unit |
|---|---|---|
| Reference flow | 160.0 | m3/h |
| Pipe inner diameter | 154.1 | mm |
| Pipe length | 320.0 | m |
| Elevation rise | 18.0 | m |
| Supply voltage (line-to-line) | 400.0 | V |
| Transformer rating | 45.0 | kVA |
Results
| Quantity | Value | Stored | Unit |
|---|---|---|---|
| Pump duty flow | 159.956 | 159.95638849150328 | m3/h |
| Pump duty head | 44.6105 | 44.610466762039216 | m |
| Pump shaft power | 24.8759 | 24.875939677088613 | kW (mechanical, at the coupling) |
| Motor real input power | 26.7483 | 26.748322233428617 | kW (real input, three-phase total) |
| Motor apparent power | 30.7452 | 30.74519796945818 | kVA (three-phase total) |
| Motor line current | 44.3769 | 44.376870809887535 | A (line RMS) |
| Feeder voltage drop | 5.52116 | 5.521160787819607 | V (line-to-line) |
| Feeder drop | 1.3615 | 1.3614975793355548 | percent of the sending-end voltage |
| Transformer loading | 0.683227 | 0.6832266215435151 | fraction of rated kVA |
| Transformer efficiency | 0.982368 | 0.9823677267646782 | fraction |
The Value column is a rounded presentation; the Stored column is the full-precision number the tool returns and the record keeps.
The steps it dispatched
| Step | What it establishes |
|---|---|
| pipe_system | friction and fittings head of the pipe run at the reference flow, from Darcy-Weisbach with the caller's actual inner diameter, roughness and total fittings K |
| system_curve | the system curve the pump must work against: static head from the elevation rise plus the boundary pressure difference in head, and the quadratic resistance coefficient k = head_loss / flow^2 |
| pump_duty | the duty point where the supplied pump curve crosses that system curve, by bounded interpolation of the supplied points only |
| shaft_power | hydraulic power rho*g*Q*H at the duty point and the shaft power it demands through the stated pump efficiency |
| motor_demand | the motor's real, reactive and apparent electrical demand and line current at that shaft load, on the stated efficiency and power factor AT the load |
| feeder_loading | voltage drop of the one feeder carrying that motor current, from the caller's per-km series impedance and length |
| transformer_load_fraction | the transformer's load fraction: the motor's apparent power over the transformer's kVA rating |
| transformer_loading | the transformer's percent R and X on its rated kVA base, plus loss and efficiency bookkeeping at that load fraction when the losses are declared |
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