Comments
Regarding March Tests
Test with Avanti refrigerator
On 3/2/06 I purchased "Watts Up Pro" portable power meter
with non-volatile memory, analysis software and RS232 communications cable to
download the data collected by the instrument to a computer. "Watts Up Pro" is a Power
Analyzer, Watt Meter and Electricity Monitor.
I then ran the refrigerator for 4 hours indoors and
recorded the data collected by the "Watts Up Pro" in a spreadsheet. The columns in the spread sheet are self
explanatory except for "Watt Hours" which the manual for "Watts
Up Pro" defines as :
"Watt Hours indicates the cumulative watt hours used
since "Watts up Pro" was plugged in.
Watt hours equal watts multiplied by time. For instance, a 150 watt bulb plugged in for 1 hour will consume
150 watt hours. In two hours it will consume
300 watt hours. "
Avanti
Indoor Test Results
(See data
in the spreadsheet)
The inside and outside temperatures of the refrigerator in
the room were 70 °F. The test was performed on 3/7/06 from 11:09 AM
to 3:09 PM (4 hours). Here is a summary
of the data:
Total Watt Hours used:
122.9
First hour 41.7 Watt Hours was used.
Second hour 27 Watt Hours was used (68.7-41.7=27)
Third hour 27.6 Watt Hours was used (96.3-68.7=27.6)
Fourth hour 26.6 Watt Hours was used (122.9 - 96.3=
26.6)
The refrigerator's motor/compressor was on for the first 12
minutes and then was off for 2 minutes.
On average the refrigerator's compressor was alternatively On for 1.9
minutes and was Off for 3.07 minutes.
Avanti
Attached to the Window Test Results
(See data
in the spreadsheet)
I attached the refrigerator to the window for 4 hours and
recorded the data collected by the "Watts Up Pro" in a
spreadsheet. The inside temperatures of
the refrigerator was 70 °F. The outdoor temperature was 45 °F. The test was performed on 3/8/06 from 6:31
PM to 10:31 PM (4 hours). Here is a
summary of the data:
Total Watt Hours used:
73
First hour 30.7 Watt Hours was used.
Second hour 14.4 Watt Hours was used (45.1 - 30.7 =
14.4)
Third hour 14.8 Watt Hours was used (59.9 - 45.1 =
14.8)
Fourth hour 13.1 Watt Hours was used (73 - 59.9 =
13.1)
The refrigerator's motor/compressor was on for the first 9
minutes and then was off for 3 minutes.
On average the refrigerator's compressor was alternatively On for 1.77
minutes and was Off for 8 minutes.
The following table summarizes the data from the above (Indoor
Vs. Window) tests:
|
Watt Hours Used |
Indoor |
Window |
|
First Hour |
41.7 |
30.7 |
|
Second Hour |
27 |
14.4 |
|
Third Hour |
27.6 |
14.8 |
|
Fourth Hour |
26.6 |
13.1 |
|
Total |
122.9 |
73 |
The energy savings are obvious. This energy savings is despite the fact that the inside
temperatures of the indoor refrigerator is NOT the same as the window
refrigerator (as it should be for accurate comparison purposes). As previously indicated (see Feb spreadsheet) , the temperature
inside the window refrigerator drops far below the temperature inside the
indoor refrigerator (even though it's physically the same refrigerator once
inside and a second time attached to a window). For energy comparison purposes, this gives an unfair
advantage to the indoor refrigerator.