Heat-pump dryer, 20 kW class

by HVAC Builder

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A closed-loop heat-pump dryer: a DX coil that takes the water out of the drying chamber's own 55 °C air, the condenser in the same stream reheating it, a circulation fan — on a Copeland ZWD81KBC digital scroll (R134a, rated to 85 °C condensing) with its 10–100 % modulation declared. Nothing leaves but condensate. Run humidity-led in a building: steered on the chamber's humidity ceiling alone. Published as an example; the figures below are solved from this model.

Example14–26 kW heating + 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

21.4 kWcooling
7.8 kWelectrical power
2.74system 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
Face and bypasssplitter0.0 kW
Drying DX coil (chamber air)dxEvaporator21.4 kW
Bypass mixing boxmixingBox-12.4 kW
Reheat condenser (in the supply)condenser-28.3 kW
Circulation fanfan-0.6 kW
ZWD81KBC digital scrollcompressor7.2 kW

Heat-pump rating

22.6 kWheating
7.6 kWelectrical power
2.98heating COP

Every air-coil refrigerant circuit here is reversible, so this machine is also a heat pump. Solved with the circuit running backwards at the standard air-to-air heating rating point — outdoor 7 °C dry bulb / 6 °C wet bulb, indoor 20 / 15 °C (EN 14511) — not at the supplier's own design conditions above, so the two ratings can be compared across machines.

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