Municipal
Ice Arena in
San Angelo, Texas
On January
22, 2004 we ran a pretest of the energy consumption of a 400 ton Chiller
at a Municipal Ice Arena in San Angelo, Texas. February 9, 2004 we ran
a post-test with the STEMS energy management system installed. The results
are as follows:
| Channel |
Description |
1/22/04
Without STEMS |
2/9/04
With STEMS |
Delta
as
raw data |
| 1 |
Volts |
283.60 |
282.30 |
-1.3 |
| 2 |
Amps |
289.31 |
256.98 |
-32.33 |
| 5 |
Power
Factor |
.87 |
.93 |
+.06 |
| 6 |
KVAR |
40.342 |
26.866
|
-13.476 |
Volts
x Amps x Power Factor x 1.73/1000 = 3-phase KW
283.6 x 289.31 x .87 x 1.73/1000 = 123.49 KWH
282.3 x 256.98 x .93 x 1.73/1000 = -116.71 KWH
Kilowatt Hours savings 5.78 KWH
An
interesting side note:
At 7 AM on 1/22/4 the ambient temperature at this facility was 44 degrees
F.
At 7 AM 0n 2/9/4 the ambient temperature at this facility was 51 Degrees
F.
With higher ambient temperatures, the cooling load should have been
greater on 2/9/4.