Energy efficiency of lifts : excellent results, both for hydraulic and traction lifts...

Energy efficiency has become incredibly important in our modern societies. Next to the threats of global warming and the CO2 issue, there is simply the fact that improving energy consumption is reducing costs. The best kWh is the one which is not used...
Therefore, insulation and reduction of electric consumption have been priorities for the building sector and for building managers, the world over.
Lifts have also come into focus,for energy efficiency, though lifts are consuming very little energy (about 6% of the energy consumption of buildings). Studies indicate that the most important area of improvement is in the downtime, in the standby consumption, that improvements can be made, at relatively low cost. Incandescent lights in the lift car can be replaced by LED for example, and many components can be put in varying levels of sleep modes. There is no need for a continuous pressure of doors while the lift stands idle, waiting for passengers to transport, etc... Component manufacturers have worked hard in the last decade and the new generation of components is consuming much less energy in standby mode. The standby consumption represents 53% of the lift consumption: an astonishing figure! The Best Available Technology (BAT) for car lights, controllers, doors and frequency converters contribute to a significant reduction of the reduction of the energy demand (15%).

For the travel energy, the motor, (regenerative) frequency converter, doors and suspension system contribute also to a reduction of the energy consumed during travel of the lift. The effort carried out to improve, has been mainly aimed at the reduction of Standby consumption.

Still, something ought to be said and written about the very low consumption of lifts when functioning. The energy used for a reference trip (up and down) in a residential European building is about 22 Wh (yes, only watts!) and costs some € 0.0033 ! For a full year of consumption, the total energy used for a residential lift in Europe would be 88kWh and would only cost € 120. For a full year!
We speak of 10 € per month! Hydraulic lifts consume a little more than electrical lifts, but we talk about EUROS, not tens of EUROS! When some in the lift industry try to use the energy issue to try to get rid of hydraulic lifts, by blaming them for a higher consumption, they are actually speaking of Wh, not even kWh. No difference should be made in the official international norms and texts (CEN and ISO), whether at European or national Member State level between energy efficiency of hydraulic and traction lifts, so small is the difference between the two.

Here under, the presentation by Prof. Anibal de Almeida, in the “Intelligent Europe” programme, on energy efficiency of lifts, insisting on the Standby consumption: Download the document