tionary and standby mode, in this way calculates the corresponding energy consumed in a day. The total energy is the sum of the two. Chapter 6 of the standard sets out how the lift’s energy efficiency class is calculated. The first step, starting from the energy of the reference cycle with empty car, is to calculate the specific energy for the operating cycle, which determines the performance level. If the result is less than 0.72, the level is 1, the best, and so on, up to 5.47 which corresponds to level 7, the worst. A similar calculation is made with the standby and standby power, best when below 50 W, worst when above 1600 W. The two values are combined and added together (the power also here becomes energy once multiplied by the non-operation time). Depending on the value this sums up to the total energy consumed in a day by the lift, the lift is classified from A to G. It is intuitive that, in a building with high traffic, the moving car component counts a lot, while in a building with low traffic, the stationary and standby component counts most. It is also understood that the same lift with a given capacity, speed and travel, depending on the category of use, will be in different classes, and certainly a hydraulic lift will also be more suitable in terms of efficiency class in a building with low traffic, while the opposite will be true for an electric lift. A final observation is that although it is widely known that the total energy consumption of a lift throughout its life cycle also includes the manufacturing, installation, and disposal phases, the standard only covers the operational phase. For further information, we recommend reading the second edition of the book ‘Elevators, Energy, Environment’ by Giuseppe Iotti, published by Anacam. 32 normativa di Paolo Tattoli e Giuseppe Iotti The UNI EN ISO 25745-1:2013 standard gives the indications for the field measurement of the energy consumption of lifts, both in motion and in standby in a reference cycle
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