1 system(s) modelled in HVAC Builder on Hitachi's published performance data and validated against it. This page is listed by HVAC Builder from published data; Hitachi has not claimed it.
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Built in this model on the maker's published performance grid and validated against it — not verified by Hitachi. Each page names its source and says so.
| Hitachi Set Free RAS-20FSXN (20 HP, 56 kW) — modelled | Hitachi Set Free FSXN technical catalogue (TCGB0124 rev. 0) — RAS-20FSXN: Table 7, 100 % combination cooling capacity at 19 °C indoor wet bulb, and the nominal power input at the 35 °C rating point (docs/hitachi-vrf-source.json) |
| Heat-pump frost/defrost derate | 43, from five makers | RMS 0.023, where the makers stand 0.029 from each other at the forty temperatures they share — the one generic curve is closer to each of them than they are to one another, and none is served much worse than any other (0.019–0.028 apiece). The EnergyPlus model this replaced had the shape inverted (deepest just below its 5 °C cutoff, then a 29-point step across it) and read up to 0.15 low |
| VRF (multi-split): capacity against the connected-capacity ratio | eight makers | they agree on a two-regime law — exactly linear below 100 % connection, saturating above it by +2 to +8 % at 130 %, with Samsung allowing no credit above 130 % — and the model reproduces both without a correction term: below full connection each indoor coil caps its own take, above it the outdoor unit's map is the ceiling (+0 %, the conservative end of the band). The standards themselves rate only at unity connection (±5 %) |
| Hitachi Set Free RAS-20FSXN (20 HP), modelled — the published capacity grid and rating-point power | 4 + 1 | 56.0 kW reached at 25, 30 and 35 °C and 52.7 at 40 °C, at 0.67–0.79 of full output; 15.65 kW drawn against the published 15.64 (+0.1 %) — one power point, so a weaker anchor than a grid |
From the validation page; every row is held by a test.
Listed from published data with the source named on every entry; a listing's figures are the manufacturer's, the model that runs them is ours. Solver results never depend on who has claimed what.