ELocation: Navy Exchange Facility- Orlando, FLJanuary 6, 2009
SUMMARY
Overall average kWh savings was 19.84% or 1,321.8 kWh during the dates
compared. Internal temperature performance was excellent during the "OFF" and "ON" periods.
The internal humidity performance was similar between the "OFF" periods & the "ON" periods.
During the Test Period an average of 264.36 kWh were saved per day. Once seasonal weather
adjustments are factored in the total estimated savings are 115,307.22 kWh per year. The Navy Exchange Facility installation of the ESM has also provided significant
environmental benefits. The annual kWh savings is equivalent to the amount of electricity
required to supply approximately 11 homes and will reduce annual Greenhouse gas emissions
by 155,535 pounds. To absorb an equivalent amount of greenhouse gases, one would
have to plant 85 acres of trees.
GOAL
To demonstrate that the ESM will reduce the kWh usage of the Tyler Refrigeration racks located
in the Navy Exchange Facility in Orlando, FL while maintaining pre-set temperature
performance.
REQUIRED MEASUREMENTS
- kWh required to operate the refrigeration racks in its current configuration
- Inside air temperature and humidity under the current configuration
- Outside air temperature and humidity under the current configuration
- kWh required to operate the refrigerating racks with the ESM operating
- Inside air temperature and humidity with the ESM operating
- Outside air temperature and humidity with the ESM operating
TEST FACILITY
The Navy Exchange Facility is a building located at 7151 Earhart Drive in Orlando, Florida
32827.
REFRIGERATION PLANT & CONTROLS
The test was conducted on two (2) Tyler Refrigeration Racks. Rack 1 consists of 3 compressors
and Rack 2 consists of 4 compressors.
TEST PERIOD
Testing of the system has occurred during the following dates:
- Friday, December 19th , 2008 - ESM placed into 7 Day Bypass (OFF) to begin test (Transition Day)
- Saturday, December 20th , 2008 - 1st Full Day of Comparative OFF Data
- Monday, December 22nd, 2008 - Unusually low ambient temperature recorded for Orlando area
- Friday, December 26th , 2008 - ESM automatically switches into SAVE (ON) Mode at noon
(Transition Day)
- Saturday, December 27th , 2008 - 1st Full Day for Comparative ON Data
- Friday, January 2nd, 2009 - Test complete and data collected (Transition Day)
TEST METHODOLOGY
During the evaluation period, the current / amperage draw of one phase on each refrigeration
compressor was monitored and logged. Inside air temperature and humidity were also logged.
Outside air temperature and humidity were tracked using the http://www.wunderground.com/ on-line tool.
The data loggers for the current / amperage draw took data samples every 8 seconds with an
accumulated record every 1 minute. This method is extremely accurate providing 1440 measures
per day for the evaluation period. The data loggers for internal temperature and humidity took
data samples every 1 minute. This method is extremely accurate providing 1440 measures per
day for the evaluation period. Either or both sets of raw data can be made available upon request.
SAVINGS RESULTS
The same days of the week having similar ambient temperature were compared to determine the
savings level of the ESM during the test. The data collection/transition days were not used in the
results as these were not full days for comparison and both the comparative Mondays for OFF
and ON data were not used due to large swings in ambient temperature.
When we look at the above ESM Off versus ESM On dates the savings results are as follows:
DAY |
DATE |
STATUS |
kWh |
TEMP |
HUMID |
SAVINGS |
Day 1- Saturday |
20-Dec-08 |
OFF |
1383.91 |
67.00
|
76.00 |
|
|
27-Dec-08 |
ON |
1126.05 |
70.00
|
74.00 |
-19% |
Day 2- Sunday |
21-Dec-08 |
OFF |
1372.78 |
66.00
|
76.00 |
|
|
28-Dec-08 |
ON |
1103.64 |
70.00
|
73.00 |
-20% |
Day 3- Tuesday |
23-Dec-08 |
OFF |
1267.78 |
59.00
|
71.00 |
|
|
30-Dec-08 |
ON |
1053.54 |
63.00
|
58.00 |
-17% |
Day 4- Wednesday |
24-Dec-08 |
OFF |
1334.12 |
70.00
|
76.00 |
|
|
31-Dec-08 |
ON |
1059.51 |
61.00
|
73.00 |
-21% |
Day 5- Thursday |
25-Dec-08 |
OFF |
1304.92 |
73.00
|
76.00 |
|
|
01-Jan-09 |
ON |
998.97 |
60.00
|
63.00 |
-23% |
TOTAL ESM OFF kWh |
|
|
6663.51 |
|
SAVE |
SAVINGS % |
TOTAL ESM ON kWh |
|
|
5341.71 |
|
|
19.8% |
INTERNAL TEMPERATURE AND HUMIDITY
- Internal Temperature The internal temperature was minimally affected by the
implementation of the ESM.
- Internal Humidity The internal humidity was relatively consistent between the ESM
ON and OFF periods.
EXTERNAL TEMPERATURE AND HUMIDITY
The graphs below illustrate the external temperature and humidity across the test periods.
External Ambient Temperature
External Ambient Humidity
DATA EXPLANATION
Facility
- AMPERAGE
Amperage draw of one phase of each refrigeration unit was recorded utilizing an ACR
SmartReader3 data logger. Data samples were taken every 8 seconds with an
accumulated record every 1 minute. The readings were then totaled for the individual
weeks and averaged for a daily number in the table above.
- INTERNAL AMBIENT CONDITIONS
Both the internal temperature and humidity were recorded utilizing the ACR
SmartReader2 data logger. Data samples were taken every 1 minute. The readings were
then averaged for a daily number in the table above.
- EXTERNAL AMBIENT CONDITIONS
Hourly temperature and humidity readings for Orlando, Florida were downloaded from
the Weather Underground website http://www.wunderground.com/. The average
temperature and humidity for the week were then inserted in the table above.
- AMPERAGE TO kWh CONVERSION
To convert amperage to kWh, you must first convert the single phase to three phase. This
is done by multiplying the amperage by 1.73 and the assumed power factor of 0.9. The
three phase amperage is then multiplied by the voltage (460) to determine the Watts
which are divided by 1000 to produce KW. The KW are then divided by the data points
recorded per hour (60). This is then the kWh used by the system during the test period.
- SEASONAL ADJUSTMENT
A properly sized system will run at full load for less than 2% of the year. Therefore, the
load on the system will fluctuate throughout the year based on internal and external heat
loads. The average annual load factor for refrigeration for the Orlando, FL area is 75%
for external temperature. The load factor during the test period was an average of 62.7%.
As a result of this the annualized savings listed in the summary above has been adjusted
by a seasonal correction factor of 1.195.
Facility: 500,000 square foot distribution center in Chino, CA.
Project scope of work: Retrofit of 475 existing 400 watt HID fixtures with six lamp T8 fixtures;
many which had motion sensors added to the fixtures to increase energy savings in low traffic areas.
The goal was to reduce energy costs, while also improving light quality in the facility. Energy savings
modules were also installed on all roof top HVAC units to increase the efficiency of the compressor
cycles and reduce energy costs.
Energy costs and consumption prior to installation of lighting and HVAC systems:
- Annual KWH’s – 2,701,964
- Annual cost- $ 378,274
Energy costs and consumption post installation of lighting and HVAC systems:
- Annual KWH’s- 1,719,262
- Annual Cost- $ 240,696
- KWH reduction- 36.37%
- Annual savings- $ 137,578
- Project cost- $ 187,500
- Southern California Edison rebate- $ 70,000
- Project cost with rebate- $ 117,500
- Return on investment- .85 years
Before
After
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