WP6-Brochure-E4 brochure - ELA European Lift Association.

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30 Optimise traffic handling and management Optimising traffic handling and management can be both relevant for single installations as well for groups of installations. For lift groups energy consumption can be reduced by putting one or more installations into a sleep or deep‐sleep mode during periods with low traffic, for example, during night time or at weekends, thus reducing or completely avoiding stand‐by losses. Recommendation: check possibilities to use or switch off lifts and to optimise traffic handling. Relevance: new and retrofit installations where more than one transportation system is available. 31 Check benefits of using condition monitoring Modern technological solutions such as condition monitoring provide the possibility to check the state of operation of a lift. Irregularities in the mode of operation can also indicate problems that affect the energy efficiency of the installation. Recommendation: check benefits to use condition monitoring and to include information on energy consumption. Relevance: new installations and retrofits. 6.5.7. Features specific to energy‐efficient escalators Escalators are primarily found in locations operated by owners who have dedicated experts for energy issues (for example, commercial shopping centres or public traffic infrastructure). The running time of escalators is usually much longer than that of most lifts. A number of aspects concerning both lifts and escalators have already been discussed in section 7.3.1. Table 7‐9 and Table 7‐10 presents additional aspects specific to escalators. Table 7‐9. Energy efficiency: Escalator drive system 1 Use high efficiency & properly sized motor Drive system As with lifts, the drive motors in escalators plus the hand rail motor should be selected from the most energy‐efficient motors. This is relevant for both the main motor for moving the stairs as well as the hand rail drive. In addition, a motor should be chosen that also provides a good efficiency ratio when running outside the nominal point of operation. Recommendation: motors should be chosen to have a high efficiency both in terms of full load efficiency, but also in terms of part‐load efficiency. Relevance: relevant for new installations and (larger) retrofits. 2 Check for adequate gearing As in geared lifts, gears are used in escalators to transform a torque‐speed ratio. Recommendation: gearing in escalators should be very efficient due to the high share of running time. Planetary, helical and hypoid helical gears can for example reach higher efficiencies than worm gears (see Chapter 3). Relevance: relevant for new installations but also for (larger) retrofits. 3 Check benefits of using variable speed drives / low speed mode / stop mode When using a variable speed drive, the speed of the escalator can be reduced until the next 114
passenger arrives. However, an additional frequency converter is necessary to thus adjust speed. This additional energy consumption has to be compared to possible gains. As an alternative or complementary option, it is also possible to set the escalator in a stop mode. Recommendation: check the benefits of using variable speed drives and using a low‐speed mode and / or a stop mode. Relevance: relevant for new installations but also for (larger) retrofits. 4 Check benefits of using regenerative drives Escalators transporting loads in a downward direction offer the possibility to generate energy. Induction motors have an inherent regenerative capability that can be improved by using regenerative drives (see Chapter 3). This recovered energy can be used in the building, for other escalators, or it can be fed back into the power grid. Recommendation: check the benefits of using a regenerative solution. Relevance: relevant for new installations and for (larger) retrofits. 5 Use high‐efficiency bearings Bearings are a source of losses in escalators. Recommendation: use low friction bearings for the operation of the escalator. Relevance: all installations. Table 7‐10. Energy efficiency: Other aspects of escalators Other aspects 6 Check benefits of adjusting operation mode to load and passengers During periods with small loads or no load at all, speed and torque can be adjusted by various means, for example, by using a pole‐switching motor, variable speed drives, or by adjusting the voltage settings of the motor (star‐delta switching). Recommendation: check benefits of adjusting speed and torque to current load situations. Relevance: all installations. 7 Use energy‐efficient lighting Some escalators are equipped with additional light sources to illuminate the steps. Recommendation: use energy‐efficient lighting systems (LEDs for example). Relevance: all installations. 8 Use sleep‐mode on escalator equipment For escalators that are set into a stop mode (e.g. outside of regular opening times), some components (e.g. frequency converter, lighting) could be switched off to minimize energy demand. Recommendation: switch off components when lifts are outside their normal operating times (e.g. during night time). Relevance: new installations and retrofits with suitable equipment. 115
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E4 ENERGY EFFICIENT ELEVATORS AND E
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Contents 1 Introduction ...........
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1 Introduction Means of vertical tr
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2 Lift and Escalator Technologies T
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Figure 2‐3. Configuration of Gear
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Some manufacturers have gone even f
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• Conventional hydraulic units do
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[2] Sachs, H., “Opportunities for
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High efficiency motors are typicall
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Figure 3‐3. Effect of load on pow
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If the linear motor is mounted on t
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3 Phase AC input 50 Hz AC/DC Conver
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preventing the car from falling. Ty
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Figure 3‐14. Regenerative operati
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occupied by lift support systems. A
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Figure 3‐19. Possible configurati
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After the introduction of relay log
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It is evident that the way lifts ar
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When combined with hall call contro
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of the torque of the 1:1 roping sch
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times as quickly as a 720 mm sheave
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LEDs are also a very efficient solu
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• Car electronics • Light curta
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The major cause of energy consumpti
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3.9 Efficient Escalators and Moving
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These bearings feature optimised in
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4 Market Characterisation As part o
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Figure 4‐2. Lift Distribution acc
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The next three figures show the lif
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5 Results of the Monitoring Campaig
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the lift, but does not include addi
Page 63 and 64: Where, E standby Standby Energy use
Page 65 and 66: Figure 5‐4 shows a typical cycle
Page 67 and 68: Figure 5‐6. Travel cycle consumpt
Page 69 and 70: Figure 5‐9. Measured standby powe
Page 71 and 72: Figure 5‐12. Annual Energy consum
Page 73 and 74: Figure 5‐16. Annual Energy consum
Page 75 and 76: Figure 5‐19. Annual electricity c
Page 77 and 78: 6.1.1 Determination of the average
Page 79 and 80: Where, P mech E cycle η system h v
Page 81 and 82: 6.2. Electricity consumption of lif
Page 83 and 84: 6.3. Estimation of potential saving
Page 85 and 86: The results show that overall savin
Page 87 and 88: 6.5. Estimation of Savings Potentia
Page 89 and 90: Identification of stakeholders and
Page 91 and 92: Table 7‐1. Categories of stakehol
Page 93 and 94: esults were presented and discussed
Page 95 and 96: We also asked which stakeholder inf
Page 97 and 98: not rate an item. Reasons for non
Page 99 and 100: Further barriers We asked responden
Page 101 and 102: Raising awareness Setting a standar
Page 103 and 104: Further topics This section address
Page 105 and 106: The scope of the present study is o
Page 107 and 108: Table 7‐4. Energy efficiency: Spe
Page 109 and 110: 10 Check system architecture Ropes
Page 111 and 112: 17 Avoid stalled motor door operato
Page 113: 24 Switch off other lift components
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