Minimising the Risk of Transmission for AHUs with Thermal Wheels
Introduction:
This white paper from FlaktGroup examines the safety of ventilation systems, which have been a focus of attention due to the pandemic.
They look into a ventilation guidance document which identifies the three principle types of Air Handling Units (AHU) and the associated risks of recirculating contaminated air.
- Run around coils (RAC),
- Plate heat exchangers
- Thermal wheels
It continues in detailing safety considerations when operating AHUs with Thermal wheels.
This White Paper concludes:
AHUs with rotors can have an EATR equivalent or lower than plate heat exchangers if the fans are in the recommended configuration, and the unit is fitted with a purge sector.
Many existing installations could safely be put back into operation, but it would be prudent to get a competent engineer to undertake a survey to ensure the unit is in the recommended configuration and fitted with a purge sector. For additional security adding pressure control would be advised.
White Paper from FlaktGroup
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