Energy Savings Escalations Team Otis COOL TOOLS Dallas, TX January 27, 2007

Hypothesis There is substantial energy savings potential in an occupancy-controlled operation mode for Adams Mark Conference Center escalators

Definitions “Substantial” = 30% or greater “Occupancy controlled” = motor goes dormant when escalator not in use “Not in use” = no one is on escalator

Constraints & Assumptions Sample time was 20 minutes, on Saturday 27 January, starting at 12 noon Commercial building electrical rate is around $0.10 per kWh In a commercial building setting, cooling will dominate throughout the year, leading to 33% additional energy use for cooling caused by use of the motor Motor is conservatively estimated as 15 HP (48” width at 20’ rise)

Methodology Equipment: stopwatch, MEEB, pen, notepad, calculator, team of 3 1.Observers document interval times where passengers were not on the escalator. 2.Calculation of savings by motor power and decreased cooling load 3.Estimation of retrofit and total cost savings (give this to ASHRAE and Hotel).

Data UP escalator was not in use for 7 minutes and 42 seconds of the 20 minute sample period (= 37.1%) DOWN escalator was not in use for 7 minutes and 48 seconds of the 20 minute sample period (= 37.4 %)

Analysis – Motor Energy 15 HP x = kW (conversion) kW x 1 hr x 0.10 = $ 1.12 / hr At 37% off time, savings per hour = $ per hour

Analysis – Cooling Energy 15 HP x = kW kW x 3412 = 38,180 Btu/h 38,180 Btu/h x 1.33 = 50,780 Btu/h 50,780 Btu/h x = kW (conversion) kW x 1 hr x 0.10 = $1.488/h

Summary: Projected Cost Savings 12-hour use interval [$1.488/h (cooling) + $0.414 (motor)] x 12 hours = $ per day On a year $ per day x 365 = $8, Estimated retrofit cost for user- activated sensors ??? Payback....!

Walter Grondzik, Daniel Faoro, Alison Kwok,