Is this an equipment selection?

No. It is the air process. Heat recovery, the coil and the humidifier are not sized from a product range.

What does a recovery ratio of zero mean?

Outdoor air is left unchanged. An empty field is not a stand-in for zero and is rejected.

Why is there condensate in summer?

If the target humidity is below the outdoor humidity, the air is cooled to saturation and then reheated when the plant can do that.

Which standard does the process follow?

States follow Magnus. Room targets are planning inputs, not a substitute for DIN EN 16798 or VDI 3803.

Ventilation

Air handling

Outdoor

−14°C

Supply air

22°C

Extract air

22°C

Air handling calculates a partial air-conditioning plant on the psychrometric chart. Moist air follows the Magnus formula, including heat recovery, heating, cooling and humidity control. The result is supply-air state, capacities and the plant airflows.

Season

Air state

Outdoor air°C%

Supply air°C%

Extract air°C%

Altitudem

1013 hPa

Functions

Humidification

Cooling

Heating

Heat recovery

Heat recovery ratio

Suggestion

Airflow

m³/h

Full air conditioning

after heat recovery8 °C · 14 % · 0,9 g/kg · 10 kJ/kg

Control groups

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How it's calculated

Air handling takes a partial or full plant through the psychrometric chart. Moist air follows the Magnus formula. Outdoor and extract air are combined with the heat-recovery ratio, then preheater, cooler, humidifier and reheater follow where the plant has them. Capacities depend on volume flow and the enthalpy difference. Without a volume flow the state path stays visible and the capacity is omitted. The limits are the same as in the psychrometric calculator.

Worked example

Winter case with a plate exchanger at the default recovery ratio: outdoor air -14.0 °C, after recovery 7.6 °C, supply air 22.0 °C.

FAQ

Is this an equipment selection?: No. It is the air process. Heat recovery, the coil and the humidifier are not sized from a product range.
What does a recovery ratio of zero mean?: Outdoor air is left unchanged. An empty field is not a stand-in for zero and is rejected.
Why is there condensate in summer?: If the target humidity is below the outdoor humidity, the air is cooled to saturation and then reheated when the plant can do that.
Which standard does the process follow?: States follow Magnus. Room targets are planning inputs, not a substitute for DIN EN 16798 or VDI 3803.