Getting Started with R-THYM
Glossary
This page defines acronyms used in the R-THYM user manual. Entries are listed alphabetically.
| Acronym | Meaning |
|---|---|
| AI | Artificial intelligence. Used in AI Co-pilot, the in-app assistant. |
| BOM | Bill of materials. The Cost Estimator list of canvas equipment, quantities, unit prices, and extended costs that sum to capital expenditure. |
| BOS | Balance of system. Install cost for items such as battery racks, wiring, and similar non-cell hardware. |
| CapEx | Capital expenditure. Up-front installed cost of equipment (the Cost Estimator total). |
| CC/CV | Constant current / constant voltage. Battery charge taper near full state of charge. |
| CIMIS | California Irrigation Management Information System. A weather-driver stub in the shared service; R-THYM does not use it. |
| CONUS | Contiguous United States. The bounding box used for NREL regional-cost fallbacks. |
| CSV | Comma-separated values. Spreadsheet export format (for example from the Component Table). |
| DOL | Direct on line. Motor starting method that applies full voltage at start; highest inrush multiplier in Appendix E. |
| DVCM | Discrete vapor cavity model. High-fidelity cavitation / column-separation option in MOC Simulation Settings. |
| EPANET | USEPA pipe-network hydraulic toolkit. R-THYM uses it for steady and extended-period hydraulics and can import/export .inp files. |
| EPS | Extended period simulation. The “daily operations” run: tanks, demands, energy, and water quality over hours or days. |
| ET₀ | FAO-56 reference evapotranspiration. Hourly climate series used for tank evaporation. |
| FAO-56 | UN Food and Agriculture Organization irrigation paper 56; the ET₀ method Open-Meteo reports. |
| GPM | Gallons per minute. Default flow unit unless you change Edit → Units.... |
| HGL | Hydraulic grade line. Elevation plus pressure head; used when discussing air valves and surge. |
| HUD | Heads-up display. The on-canvas weather and clock overlay. |
| ID | Identifier. The unique name of a node or link on the canvas. |
| IIR | Infinite impulse response. Filter used in the MOC unsteady-friction (USF) model. |
| INP | EPANET input file (.inp). |
| JSON | JavaScript Object Notation. R-THYM’s native project/export format. |
| kW / kWh | Kilowatt (power) and kilowatt-hour (energy). |
| MOC | Method of characteristics. The surge / water-hammer engine (not the EPS run). |
| MSX | EPANET Multi-Species Extension. Water-quality mode for multiple reacting constituents. |
| NREL | U.S. National Renewable Energy Laboratory. Regional cost centroids used when reverse geocoding fails. |
| NWP | Numerical weather prediction. The forecast blends Open-Meteo documents; R-THYM does not re-analyze those fields. |
| O&M | Operations and maintenance. Annual and per-cycle costs on the Cost Estimator Maintenance tab. |
| OpEx | Operating expenditure. Recurring costs (energy, fuel, water, O&M) as opposed to CapEx. |
| OSM | OpenStreetMap. Place-name source for reverse geocoding via Nominatim. |
| PCC | Point of common coupling. Utility interconnection / metering location in the CapEx book. |
| PCV | Pump control valve. Sequences pump start/stop with discharge-valve ramps to limit surge. |
| PID | Proportional–integral–derivative. Feedback control on a Control Link. |
| PLC | Programmable logic controller. Costed with control links in the Capital unit-price book. |
| R-THYM | Real-Time Hydraulic Model. |
| RO | Reverse osmosis. Treatment process on the Water Supply price tab. |
| SOC | State of charge. Battery energy remaining, as a fraction of capacity. |
| SRV | Surge relief valve. |
| TDH | Total dynamic head. Pump or turbine head used in power calculations. |
| TOU | Time-of-use. Diurnal energy-price pattern on Cost Estimator → Power. |
| UI | User interface. |
| USF | Unsteady friction. MOC damping model (Brunone / IIR). |
| UV | Ultraviolet disinfection. Treatment process on the Water Supply price tab. |
| VFD | Variable frequency drive. Variable-speed pump starting and the associated CapEx multiplier. |
| WASM | WebAssembly. How the MOC (and EPANET) solvers run in the browser. |
| WQ | Water quality. Chemical, age, trace, or MSX analysis enabled from Data → Water Quality Options.... |
[!NOTE] Units such as psi, gpm, and ft are chosen in Edit → Units...; they are not repeated here unless the acronym is used as a proper name in the manual.