1. Elevator Modernization Delivers Dependable Energy Savings for 735 N
Elevator Modernization Delivers Dependable Energy Savings for 735 N. Water Street Sheldon Oppermann, Compass Properties Don Vollrath, Magnetek

2. Agenda 735 Water Street Building Elevator Modernization
Options for Modernization
Starting a Successful Elevator Modernization
Industry Terminology
Elevator Energy Consumption
Project Results

3. 735 N. Water Street Building
17-story
360,000 Square Feet of Premium Office Space
Built in
City Center
1913

4. 735 N. Water Street Building
Project Goals
Project Scope
Results
First “high performance,” high-rise tower designation in the state of Wisconsin
Awarded the first BOMA 360 Performance Program® designation in Wisconsin
BOMA International’s TOBY award
Tenant satisfaction

5. Elevator Modernization Goals
Improved Appearance
Improved Service
Improved Ride Quality
Reduced Energy Consumption
Reduced Maintenance

6. Elevator Modernization
Partnered with Performance Elevator Consulting to develop an ambitious modernization project
Improve energy efficiency
Provide improved ride quality for tenants
Increase tenant satisfaction
Deliver sustainable operations
Incorporates Schindler Elevator Corporation’s Destination Dispatch PORT technology
Provides optimized traffic flow throughout the building
Incorporates Magnetek’s Quattro® Elevator Drives

7. Original System Original Otis gearless DC machines circa 1910-1916
Two control rooms, 4 cars each
15-17 landings, 2500 lbs capacity, 600 ft/min
Motor-Generator (m-g) controls with open panel relays and cam operated landing position mechanism, circa 1947
Dimly lit, crowded, and dirty control room

12. Options for Modernization
Rip it all out and replace with the “latest and greatest” Permanent Magnet motor
Can be a high cost solution
Re-use the Gearless DC machine and upgrade with better controls
Offers many advantages with reasonable risks
A lower cost solution

13. Permanent Magnet Motor Misconceptions
“A big old motor means a big utility bill”
Elevators are only 5-8% of the building consumption
“Must use variable speed, variable frequency AC drives”
All DC elevator motors and controls are already variable speed

14. Permanent Magnet Motor Misconceptions
“Gearless PM AC will be far more efficient”
There is little difference in efficiencies between the use of Gearless AC PM and Gearless DC machines
“Only the new PM AC drives can regenerate to save energy”
ALL DC motors and drives can regenerate and have always been that way

15. DC Elevator Modernization
Allows you to retain existing motor
Environmental benefits
Saves expensive demolition
Using fewer natural resources to build, transport, and install a new motor
Saves money
Energy efficiency

16. Starting A Successful DC Elevator Modernization
Utilize an experienced elevator consultant and equipment suppliers
Evaluate the quality of the existing DC motor equipment
Look for solutions that will not require changes in the existing utility distribution system
Make sure the new equipment will regenerate, providing minimal energy consumption

17. Elevator Terminology
Geared vs. Gearless – Many slower speed elevators (less than 500 ft/min) use an inefficient gearbox to reduce motor rpm. These applications are ripe for conversion to a gearless Permanent Magnet AC motor (PM AC) to improve operating efficiency. Higher speed elevators are most likely already using a gearless motor

18. MEASURE IT ONCE – USE IT TWICE
Elevator Terminology
Regeneration – Recovery of mechanical energy of motion and feeding it back into the utility system to be used again. This offers the best bang for the buck in elevator systems economy.
MEASURE IT ONCE – USE IT TWICE

19. Elevator Terminology
Low Current Distortion – minimizes electrical noise interference with other equipment in the building
High Power Factor – using all the electric current drawn from utility lines to do useful work
These two factors help reduce energy costs without need for upgraded wiring

20. Estimating Elevator Energy Consumption
Estimated energy savings by reusing the existing DC motors with Magnetek’s Quattro® DC drives were very promising
Magnetek Elevator Energy Savings Calculator

21. 735 N. Water St. Project Re-used the original DC gearless motors
Schindler Elevator TXR5 car controller with PORT destination dispatch technology
Magnetek Quattro® DC motor drive
Low Harmonics, High Power Factor
High Efficiency, Fully Regenerative

22. Complications
Only 208V service in building so there was need for a voltage step-up transformer to meet the voltage rating of the motors
Energy measurements included that of the transformer and TXR5 car controller

23. Energy Consumption Results
Measured data recorded on one elevator before and after modernization for longer than 100 continuous days each.
Each elevator averaged ≈505 runs per day
Energy Consumption
Old: 61 kWhrs/day
New: 38 kWhrs/day
Estimated Savings of 66,900 kWhrs/year for all 8 cars
This represents a 38% energy savings!

24. Conclusion
The building and elevator modernization of 735 N. Water St. met the initial objectives
Improved ride quality
Improved tenant service and satisfaction
Significant energy savings
Reasonable cost

25. Questions?
Thanks for listening