Component reference
| Component | Ports | What it models |
|---|---|---|
| DX evaporator | air + refrigerant | Direct-expansion cooling coil: ε-NTU with boiling refrigerant, dehumidification via bypass/ADP, dry-coil fallback at small duties. |
| Condenser | air + refrigerant | Heat rejection to an air stream (film condensation inside, air-side j-factor outside). |
| Compressor | refrigerant | AHRI 540 / EN 12900 10-coefficient map in (evaporating, condensing) temperature, with superheat/subcool corrections. Pick a real model from the catalog or paste coefficients. |
| Water coil | air + water | Chilled/hot-water coil; the indirect stage of two-stage evaporative systems. |
| Wet pack | air + water | Evaporative media (published CelDek-family effectiveness). Water ports open → adiabatic; in a loop → cooling tower / spray stage. |
| Fan | air | Moves the design flow; motor heat warms the stream by its heat-to-air fraction. |
| Pump | water | Loop circulation; power counts in totals. |
| Heater | air | Self-modulating duct heater holding a discharge setpoint; annual control steers it hourly. |
| Heat pipe | air × 2 | Wrap-around precool/reheat pair; effectiveness calibrated to manufacturer selection data. |
| Recovery core | air × 2 | Air-to-air recovery between exhaust and outside air: a plate core (sensible, condensing in winter) or, with a humidity efficiency declared, a sorption or hygroscopic wheel or an enthalpy plate that hands moisture across too. Pick a real core or set your own effectiveness curve. |
| Pipe-in-pipe HX | water + refrigerant | Coaxial exchanger — water-cooled condensing or chilled-water production. |
| Plate exchanger | water + water | Water-to-water plate exchanger — a waterside economiser between a tower loop and a chilled-water loop, or hydraulic separation between two loops. See the configuration reference. |
Any topology the fluids allow is solvable: multi-loop water circuits, closed air recirculation, heat-pipe wraps around DX coils, water-cooled condensers. Design-flow mismatches between connected components are flagged as warnings after solving.