Part of the energy audit process should be to review the condition of the plant, and equipment, generally if problems are discovered these can be categorised as deferred maintenance.
Here an example, an 800 mm axial fan, and a key part of the extract system providing mechanical ventilation. The photograph of the suction side clearly shows the flexible connection is ripped, and the discharge side was similarly damaged.
The extract fan was operating, still moving air, and consuming amperes, but the ‘system’ was not functioning. The failure points occurred at the highest pressure (discharge side) and lowest pressure (suction side) regions, that means little air movement could occur inside the ductwork.
Now explain to the management why they paid for electricity for the whole of last year, but no mechanical ventilation was provided.
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