Posts tagged NABERS
Examples of 'energy efficient' control strategies that often waste energy - CO2 control

I often review BMS functional descriptions that read: The AHU outside air damper is modulated between minimum damper position (set at commissioning) and 100% open, as the maximum return air CO2 increases from 600 to 800 ppm.

This control strategy is designed to maintain indoor air quality and not to improve energy efficiency. It does not meet the intent of demand control ventilation. 

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How can your current BMS maintenance contract save you energy for 'free'?

You would be surprised at how little Building Management Systems maintenance contracts have changed in the past ten years. Maintenance contracts are still primarily set up for Periodic Preventative Maintenance.  

If we take a preventative maintenance contract and schedule in additional time for optimisation, tuning, mini projects, improved alarming, improved trending, recommissioning and updating out of date documentation, then the annual maintenance cost will increase, probably significantly, and to a point that the funding will not be available.

However, if we reshuffle the twelve month plan into a three year plan, but keep the same annual maintenance cost and hours, then we can shift energy efficiency tasks into the freed up days.

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