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Ene 06 Energy efficient transportation systems

Number of credits available	Minimum standards
3	No

Aim

To recognise and encourage the specification of energy efficient transportation systems.

Assessment criteria

The following is required to demonstrate compliance.

One credit - Energy consumption

Where lifts, escalators and/or moving walks (transportation types) are specified:
1. An analysis of the transportation demand and usage patterns for the building has been carried out to determine the optimum number and size of lifts, escalators and/or moving walks.
2. The energy consumption has been calculated in accordance with BS EN ISO 25745 Energy performance of lifts, escalators and moving walks, Part 2 : Energy calculation and classification for lifts (elevators) and/or Part 3: Energy calculation and classification for escalators and moving walks, for one of the following:
  1. At least two types of system (for each transportation type required); OR
  2. An arrangement of systems (e.g. for lifts, hydraulic, traction, machine room-less lift (MRL)); OR
  3. A system strategy which is ‘fit for purpose’.
3. The use of regenerative drives should be considered, subject to the requirements in CN3.3.
4. The transportation system with the lowest energy consumption is specified.

Two credits - Energy efficient features

Criterion 1 is achieved.

Lifts

For each lift, the following three energy efficient features are specified:
1. The lifts operate in a standby condition during off-peak periods. For example the power side of the lift controller and other operating equipment such as lift car lighting, user displays and ventilation fans switch off when the lift has been idle for a prescribed length of time.
2. The lift car lighting and display lighting provides an average lamp efficacy, (across all fittings in the car) of > 55 lamp lumens/circuit Watt.
3. The lift uses a drive controller capable of variable speed, variable-voltage, and variable-frequency (VVVF) control of the drive motor.

Where the use of regenerative drives is demonstrated to save energy, they are specified.

Escalators and/or moving walks

Each escalator and/or moving walk complies with at least one of the following:

It is fitted with a load-sensing device that synchronises motor output to passenger demand through a variable speed drive; OR
It is fitted with a passenger-sensing device for automated operation (auto walk), so the escalator operates in standby mode when there is no passenger demand.

Checklists and tables

None.

Compliance notes

Ref	Terms	Description
Shell and core
CN1	Applicable assessment criteria	Option 1 - Shell only: This issue is not applicable. Option 2 - Shell and core: All criteria relevant to the building type and function apply. Refer to Appendix D – BREEAM UK New Construction and Shell and Core Project Assessments for a more detailed description of the above shell and core assessment options.
Simple buildings
CN2	Applicable assessment criteria	Energy consumption (1 credit) Criterion 1 Energy efficient features (1 credit) Criteria 2 and 3 only; criteria 4 to 6 are not applicable.
General
CN3	Scope of this issue	The criteria relating to lifts do not apply to lifting platforms, wheelchair platform stairlift(s) or other similar facilities to aid persons with impaired mobility. However, any lifting device with a rated speed greater than 0.15m/s must be assessed, inclusive of goods, vehicle and passenger lifts. A demonstration of compliance with the BREEAM criteria relating to the excluded transportation types would be considered best practice for an energy efficient system (despite not being required for the purpose of awarding the available credits).
CN3.1	Transport analysis	The transport analysis can be in the form of a written statement justifying the lift selection for the following conditions: where a single lift is provided in a low rise building for the purpose of providing disabled access only; or where a goods lift is selected based on the size of the goods it is intended to carry.
CN3.2	Building has no lifts, escalators or moving walks or has only one of the transportation systems	This issue will not be assessed where a building contains no lifts, escalators or moving walks. Where only one of the transportation systems is present, the two 'Energy efficient features' credits can be awarded where the one system is compliant with the relevant criteria.
CN3.3	Regenerative drives See criteria 1c and 4.	A regenerative drive should only be considered where it produces an energy saving greater than the additional standby energy used to support the drives. Regenerative drives will typically be appropriate for lifts with high travel and high intensity use.

Methodology

None.

Evidence

Criteria	Interim design stage	Final post construction stage
All	One or more of the appropriate evidence types listed in The BREEAM evidential requirements section can be used to demonstrate compliance with these criteria.

Additional information

Relevant definitions

Lift car lighting: The level of lift car lighting is determined by the relevant standards. For example, BS EN 81-1 and 2: 1998+A3: 2009 require 50 lux on the car floor and any control surfaces.
MRL: Machine room-less lift: All equipment is contained in the lift well, not in a separate machine room.
Standby condition - lifts: A condition when a lift is stationary at a floor and may have reduced the power consumption to a lower level set for that particular lift (from BS EN ISO 25745-1: 2012). The period between when a lift was last used and when a standby condition is entered is defined in BS EN ISO 25745-1 as 5 minutes.
Standby condition - escalators and moving walks: A condition when the escalator or moving walk is stationary and powered on and it can be started by authorised personnel.
Idle condition: A condition when a lift is stationary at a floor following a run before the standby mode is entered (from BS EN ISO 25745-1: 2012).

Other information

BS EN ISO 25745 - Energy performance of lifts, escalators and moving walks

ISO 25745 is planned to consist of three parts, under the general title Energy performance of lifts, escalators and moving walks:

Part 1: Energy measurement and verification
Part 2: Energy calculation and classification for lifts (elevators)
Part 3: Energy calculation and classification for escalators and moving walks.

In Part 1, it has been estimated that approximately 5% of a building’s total energy consumption can be attributed to the operation of lifts and a large proportion of this can be attributed to standby mode in many situations. BS EN ISO 25745 Parts 2 and 3 have been prepared in response to the rapidly increasing need to ensure and to support the efficient and effective use of energy, providing:

A method to estimate energy consumption on a daily and an annual basis for lifts, escalators and moving walks.
A method for energy classification of new, existing or modernised lifts, escalators and moving walks.
Guidelines for reducing energy consumption that can be used to support building environmental and energy classification systems.