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Demonstration Installation:
Air-Conditioning Split System,
New York Power Authority
Where
The elevator machine room at the New York Power Authority building at 123 Main Street, White Plains, NY.
When:
July/August 2005, consisting of:
- Metering with PaceController installed and online (7/22–28)
- Metering without PaceController installed: performed (7/28–8/3)
What
Four-ton York split-system air conditioning unit Top Line Result
Normalized average power demand was reduced by 28.1%
Demonstration Protocol
Data for the following variables were captured for both with PaceController–installed period and the without–PaceController installed period.
- Energy usage by the unit (AC current/power – kW)
- Outside temperature
- Inside temperature and relative humidity
Datalogger was placed on top of a vent duct, 9 feet off the ground, on a wall near the thermostat. It was observed that the elevator room had both substantial return air from shafts and a large exhaust fan to the outside, making for a fairly “open” system.
York 4–Ton Inside Temperature and Relative Humidity Data
Data show that indoor temperature and humidity were generally well controlled, given the open structure of the elevator machine room, ambient conditions and the position of the datalogger.
Click here to view temperature and relative humidity data from the elevator machine room for both the with- and without-PaceController-installed period.
York 4 Ton with/without Current Draws vs.
Ambient Temperature
With the PaceController installed, despite consistent demand on the system, the unit paced its output, resulting in lower energy consumption. During the without-PaceController installed period, the unit never shut down and utilized significantly more energy.
Click here to view amp usage for both the with– and without–PaceController-installed period.
Analysis of the Average Power Demand
PaceController shows a net demand reduction of 28.1%. Although the controlled-space temperature increased slightly with the PaceController online, the controlled-space humidity actually decreased—both likely reflecting the open-to-environment aspect of the controlled space.
Click here to view the analysis statistics of the four-ton York unit.
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