Packaged DX VAV rooftop, 7 m³/s
by HVAC Builder
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A packaged rooftop for a VAV floor: outside-air damper with an economiser and demand-controlled ventilation, DX coil on an inverter scroll, an electric heater for morning warm-up, and a supply fan that holds a duct static as the boxes throttle; the boxes themselves live on the building. Published as an example; the figures below are solved from this model.
Example85–125 kW heating + coolingEUExample 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
Solved from this example's own model as it is published — the same numbers a supplier's page shows for their machine.
Component schedule
| Component | Kind | Duty |
|---|---|---|
| Outside-air damper: 24 % OA, economiser, DCV, 06–18 | Damper | 0.0 kW |
| Return damper | Damper | 0.0 kW |
| DX coil | DX evaporator | 112.1 kW |
| Electric heater (warm-up) | Heater | 0.0 kW |
| Supply fan (duct static 150 Pa) | Fan | -4.2 kW |
| Inverter scroll (8 modules) | Compressor | 26.7 kW |
| Air-cooled condenser | Condenser | -137.5 kW |
| Condenser fans (2) | Fan | -3.6 kW |
Heat-pump rating
No refrigerant circuit in this machine is declared cooling-only, and none condenses in an evaporative condenser, so it is also rated as 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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