Are you Hitachi?

Claim this page from the app's Company page: register as a supplier (company name and contact email), open the Profile sub-tab and claim the brand. We confirm each claim by hand before it takes effect; from then the page and its listings are yours — attributed to your company, quote requests for designs that use them reach whoever you name with the design attached, and any listing is yours to edit or withdraw. No charge, no commission. Open the Company page

Systems modelled on Hitachi's published data

Built in this model on the maker's own published data — not verified by Hitachi. Each page names the document it was read from and what the model was held to.

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)

How the model reads against Hitachi's data

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 0.62–0.70 of full output; 15.64 kW drawn against the published 15.64 (within 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.