Elevator Trends and Technologies Transforming Tall Buildings
Our cities are getting taller. Today there are more than 250
million elevators in use worldwide. So what are some of the vertical
transportation trends and technologies helping designers reach new heights?
Technology
A
potential game-change is ThyssenKrupp’s cable-free elevator system. The
MULTI technology places linear motors in elevator cabins, allowing multiple cars and
horizontal movement in a single shaft transforming how people can move inside a
building.
“After 160
years, we are moving away from the cable-dependent elevator. Buildings can now
evolve, reach new heights, shapes and purposes,” said Patrick Bass, CEO of
ThyssenKrupp North America, Inc. “As the world’s population continues to
migrate into urban areas, efficient mobility in buildings is no longer a
luxury, but an absolute necessity.”
By mid of
2015 the firm plans to have a scaled 1:3 model in their R&D center in
Gijon, Spain and by the end of 2016 a running prototype will be installed in a
new test tower in Rottweil, Germany.
The
advancements afforded by MULTI stand to impact a new era for cities by
decreasing elevator wait times for inhabitants to 15 -30 seconds, adding
rentable space by decreasing the elevator footprint by up to 50%, and
conserving energy use within buildings.
Sustainability:
Energy conservation, of course, is no longer an added
value it is a prerequisite. Buildings are responsible for 40% of the world’s
energy consumption. Elevators and escalators make up 2 to 5 percent of the
energy used in most buildings, but can reach as high as 50 percent during peak
operational times
On
average, new elevator technologies such as the ThyssenKrupp TWIN elevators can
save up to 27% of energy when compared with other technologies, and reduce the
electrical power required by half. This leads to lighter and simpler power
supply systems required for buildings and, according to the energy efficiency
guidelines for elevators established by the Association of German Engineers in
2009 (VDI 4707), the most efficient elevator technology configurations can save
up to 70% on energy consumption of a building.
In addition, elevators can
also operate as power generators. Regenerative drives, which use energy created
when the cabins slow down (converted into electricity and fed back into to the
building’s power grid), reduce energy needs for the building by approximately
30%.
Taking into consideration the
higher initial costs of constructing a green building, the impact that new
elevator technologies can have on the overall operating costs of existing
buildings is significant. This is especially true for older buildings, where
maintenance costs escalate as structures get older. These regenerative
technologies can be introduced in almost any existing elevator providing
immediate benefits.
Although
more energy-efficient elevators can significantly reduce the costs of operating
a building, the information needed to help building owners identify the
appropriate elevator system — and the savings associated with it — aren't
readily available, according to a new study published by the American
Council for an Energy-Efficient Economy (ACEEE)
Without a
standard way to measure energy savings and a rating system to
distinguish more efficient elevators, building owners may be unaware of the
benefits of upgrading to a more efficient system or choosing a more efficient
system for new construction says the report.
"Enhanced
visibility when it comes to elevator efficiency can help customers grasp the
full value package of better controls, improved performance, reduced sound, and
increased comfort," said Harvey Sachs, ACEEE senior fellow, and the
study's lead author.
The study
lays out a framework for industry leaders to set common standards for measuring
elevator efficiency, which could potentially lead to a rating system, along the
lines of those already in place for heating, ventilating and air-conditioning
systems, and many home appliances.
The report
identified energy-efficient elevator technologies that can be included in
building codes and factored in elevator rating and labeling systems. As almost
all elevators are idle far more than they are moving, reducing standby power,
such as by turning off lights and cab ventilation systems, can be relatively
inexpensive and dramatically cut total energy use. In addition, new
technologies, such as coated steel belts that replace cable ropes in some
elevators, allow for more efficient operation. Advanced dispatching software can
improve the customer experience by reducing wait time while cutting energy use
in half compared to traditional systems, according to the report.
Speed & Comfort
As
buildings become taller, there is also growing demand for elevators that travel
faster. Mitsubishi Electric, for example, has developed an ultra-high-speed
elevator capable of travelling 1,080m/min, a considerable step-up from their
traditional 750m/min. With increased speed comes increased challenges.
“The
development of faster elevators means we have had to contend with issues not
previously faced before by lift designers, particularly when it comes to
comfort levels,” said Masaji Iida and Yoichi Sakuma from Mitsubishi Electric.
Vibration,
noise and compression are three critical issues they explain:
“To
suppress vibration inside the car, we have developed an active roller guide
which uses acceleration sensors installed on both the car and car frame to enable
the same degree of riding comfort as by conventional active control.”
“To reduce
noise inside the car, the shape of the air rectification cover has been
optimized and noise reduction measures in the vicinity of the car and
noise-proofing of the car itself carried out to attain acceptable noise value
levels for speeds of 1,080m/min.”
“For a
building that is 500m tall, the difference in compression levels between the
top and bottom floors is about 6,000 Pa. To mitigate the sensation of
compression in the ears experienced by passengers, air pressure change lines
and an atmospheric pressure control unit have been developed and
commercialized.”
An
additional challenge, which from a solution perspective is still evolving,
comes with size. A motor driving a typical 500-foot-a-minute elevator can fit
in about 27 cubic feet. On the other hand, a high-speed motor like those in a super tower takes up about half a room
Space Saving
Indeed,
reducing the space needed for services is a real challenge for mechanical
engineers; less service space means more lettable space.
Machine
Room-Less (MRL) solutions are helping to return leasable space to the project
owners by eliminating planned overhead machine rooms that were typically
required with conventional traction elevator models.
KONE was the first to deliver an MRL elevator
solution in the early 1990s. Fast forward today and their new EcoDisc
technology eliminates the need for a machine room by utilizing the guide rail
to support the hoisting machine, and placing all control and logic systems in
an integral control space. It also uses less power which helps save on general
construction.
Elsewhere, the development of the
machine room-less hydraulic elevator additionally allows for petroleum-free
operation, without the weight and capacity restrictions associated with
traction machine room-less products. All the components to run the elevator are
housed within the elevator hoistway space.
Then, as
referenced above, there is the MULTI technology which expands upon
ThyssenKrupp’s TWIN elevator system, which was the first system to offer two
cabins per shaft to increase transport capacity and reduce the elevator
footprint in buildings.
The Future
Innovative
vertical transportation technologies are transforming the city of tomorrow.
They are increasing transport capacities and efficiency while reducing the
elevator footprint and peak loads from the power supply in buildings. They are
transforming how people are able to move and enabling buildings to adopt
potentially limitless heights, shapes and purposes.
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