Fifteen per cent of the energy contained in hood exhaust air tends to be recovered in traditional air-to-air heat recovery systems. This could be increased to 60 to 70% by:
- retrofitting paper machines with enclosed hoods (50% energy saving compared to canopy hoods)
- enclosing the paper machine, which reduces the volume of air needed to be heated and reduces requirements in the exhaust fan
- optimising the ventilation system by ensuring that ventilation systems run at the minimum temperature required.1
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