Indianapolis Power and Light- Tom Noonan
ENERGY FINANCING GROUP INC.
RE: Update on Preliminary Findings at IPL
Indianapolis Power & Light maintains a 3-story building on North Arlington Street on the east side of Indianapolis. This serves as their meeting and monitoring equipment center, as well as having offices and equipment warehouses.
The Arlington chiller is a York Model YCRKOO-46 120-ton unite used to cool water circulated to air handling units which cool this facility. It was installed in 1989, and is maintained under a service agreement with York. Due to the very cautious nature of IPL and the skepticism of York it was agreed to have the York personnel who service this 120 ton unit to do the Hy-Save installation, under our guidance. Thus, Energy Financing Group contracted with York in October to install two Hy-Save #850-IND LPA pumps: one for the lead 50 ton reciprocating compressor, the other on the lag 70 ton reciprocating compressor. Each compressor is connected by individual refrigeration circuits to air cooled condensing units located on the roof.
This being IPL's metering and monitoring equipment, there was an abundance of available equipment. Tonnage produced was measured through chiller operating logs printed out on four-hour intervals by the chiller control panel. Power draws were measured by IPL's load and voltage group. A BMI multimeter was set up to monitor the chiller, and separate Esterline Angus chart recorders were set up to record amperage draws by the condensing units. Also, York mounted their own monitoring equipment.
The 10 day Pre test was conducted in late October--the most beautiful stretch of Indian Summer we have had in some time. On November 10, the Hy-Save pumps were turned on and the arctic conditions began. Nonetheless, we managed to get some comparable readings. Equal load conditions indicate a 45% reduction in compressor power draw. Also, the 8-10% increase in suction pressure does indicate an increase in the system's cooling capacity.
Further testing will be conducted this spring by IPL. They then plan to publish a full scale report. In the interim, please feel free to contact Tom Noonan of EFG in Indianapolis (317) 849-0492 for any further information.
YORK INTERNATIONAL CORPORATION
NO. OF UNITS: 1
REMOTE CONDENSER MODELS: Air Cooled
MINIMUM COMPRESSOR CAPACITY: Single Power Supply -- 214
The Arlington chiller is a York Model YCRKOO-46 120 ton unit used to cool water circulated to air handling units which cool the facility. It was installed in 1989, and is maintained under a service agreement with York. It was agreed by all parties to work with York's service arm to install the Hy-Save pumps in order to keep all contracts and insurance agreements in place. EFG contracted with York to install two Hy-Save #850-IND LPA pumps; one for the lead 50 ton reciprocating compressor, the other on the lag 70 ton reciprocating compressor. Each compressor is connected by individuals refrigeration circuits to air cooled condensing united located on the roof.
The pumps were installed in October. To accurately measure variations in energy consumption per ton of refrigeration produced, it was decided to use a one week period for both "pre" and "post" test periods. The system was valved to include pump operation on November 10. Tonnage produced was measured through chiller operating logs printed out on four-hour intervals by the chiller's control panel, done by Arlington maintenance personnel. Power draws were measured by IPL's load and voltage group under Bill Jones' direction. A BMI multimeter was set up to monitor the chiller, and separate Esterline Angus chart recorders were set up to record amperage draws by the condensing units.
IPL test equipment provided direct records of KW draw by time graphically. To convert chiller log readings to tons of cooling produced, the following formula was used:
(Chiller entering water temp ( F) - Chiller leaving water temp ( F))
All units cancel but tons. KW draw at the same time was divided by tons to derive KW / ton, a measure of efficiency for the chiller.
Copies of pictures of the test installation, including the LPA pumps and all piping revisions, are attached for reference. Also attached is a brief schematic of the piping changes made to the system, provided EFG.
York literature for the chiller is attached. It shows full load
requiring 126 KW for 120 tons, or 1.05 KW/ton.