VRF outdoor unit, 33 kW (12 HP): inverter + fixed scroll bank

by HVAC Builder

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A 12 HP-class VRF outdoor unit drawn as the frames of that size are built: a catalog inverter scroll and a catalog fixed-speed scroll on one circuit — a bank, the fixed machine running flat out as base load and the inverter trimming — behind a condenser declared from a 12 HP cabinet (980 × 1630 × 800 mm, 11 500 m³/h). Modulated to 33.5 kW the way the control runs it, it draws a maker's published power input within −9 to +3 % from 25 to 39 °C outdoor, the miss at the cool end, where a real unit runs its fixed scroll harder than the staging rule does. Published as an example; the figures below are solved from this model.

Example30–60 kW coolingEU

Example system. Published by HVAC Builder to show suppliers what their own page looks like. There is no company behind it and it is not a product offer — the specification is generic and the performance is solved from the model on this page.

Design-point performance

52.9 kWcooling
19.6 kWelectrical power
2.70system COP

Solved from this example's own model each time the page loads — the same numbers a supplier's page shows for their machine.

Component schedule

ComponentKindDuty
JPV066AC inverter + ZP67KZE fixed scroll (bank)compressor19.3 kW
Air-cooled condensercondenser-71.2 kW
Condenser fanfan-0.3 kW

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