Physical Test with Avanti Refrigerator
1. Two thermometers are securely attached
(taped) to the inside of the freezer to record their average temperature (every
4 minutes).
2. The refrigerator/freezer (R/F) is turned off and its door is left
open until its inside and outside temperatures are equal.
3. The R/F's door is then closed and turned On. Every 4 minutes the temperature inside the
freezer is recorded.
Indoor Test
R/F is Indoors and the Indoor Temperature is 75 F
|
4 Minute Intervals |
Temperature Inside
Freezer |
|
1 (4 minutes) |
58.5 F |
|
2 (8 minutes) |
41.5 F |
|
3 (12 minutes) |
32 F |
|
4 (16 minutes) |
29 F |
|
5 (20 minutes) |
26.5 F |
|
6 (24 minutes) |
24 F |
Outdoor Test
R/F is Outdoors and the Outdoor Temperature is 50 F
|
4 Minute Intervals |
Temperature Inside
Freezer |
|
1 (4 minutes) |
36 F |
|
2 (8 minutes) |
22 F |
2/1/06 Second Test
For this test the
temperature inside the refrigerator was recorded (not the freezer):
R/F is Indoors and the Indoor Temperature is 64 F
|
4 Minute Intervals |
Temperature Inside
Refrigerator |
|
1 (4 minutes) |
63.5 |
|
2 (8 minutes) |
57.6 |
|
3 (12 minutes) |
51.3 |
|
4 (16 minutes) |
45.5 |
|
5 (20 minutes) |
42.1 |
|
6 (24 minutes) |
39.4 |
|
7 (28 minutes) |
37.6 |
|
8 (32 minutes) |
36.5 |
|
9 (36 minutes) |
35.4 |
|
10 (40 minutes) |
34.3 |
|
11 (44 minutes) |
33.4 |
|
12 (48 minutes) |
32.4 |
|
13 (52 minutes) |
32 |
|
14 (56 minutes) |
31.6 |
|
15 (60 minutes) |
31.3 |
|
16 (64 minutes) |
30.9 |
|
17 (68 minutes) |
30.9 |
|
18 (72 minutes) |
30.7 |
I then did the same test
outdoors. Before turning the power On, I
left the refrigerator's door open to equalize the temperature inside the
refrigerator with the outdoor temperature.
R/F is Outdoors and the Outdoor Temperature is 40 F
|
4 Minute Intervals |
Temperature Inside
Refrigerator |
|
1 (4 minutes) |
39.4 |
|
2 (8 minutes) |
34.3 |
|
3 (12 minutes) |
30.7 |
|
4 (16 minutes) |
27.3 |
|
5 (20 minutes) |
25.7 |
|
6 (24 minutes) |
23.5 |
|
7 (28 minutes) |
23 |
|
8 (32 minutes) |
21 |
|
9 (36 minutes) |
21.2 |
|
10 (40 minutes) |
19.9 |
|
11 (44 minutes) |
19.4 |
I then let it run outdoors
for about 20 minutes and measured the temperature of the freezer
(evaporator). It is 15° F.
Energy Savings Rate = H = 1 - (Tw
/ Ti )2
Tw = 40 - 15 = 25° F and Ti = 64 - 15 = 49° F Therefore H = 1 - (25/49)2 = 1 - 0.26 = 74% Energy Savings Rate.
Let's compare the data in
the two tables. In the indoor test, the
temperature inside the refrigerator went from 39.4° to 30.7° in 48 minutes (12 x four minute intervals). Therefore in the outdoor test, the
temperature inside the refrigerator should go from 39.4° to 30.7° in 48 x 0.26 = 12.5 minutes. But in the actual test, the temperature
declined from 39.4° to 30.7° in just 8 minutes (2 x four minute
intervals). The test results in this
case surpassed the result of the equation (instead of 12.5 minutes, it
took only 8 minutes).
The same comparison can be
made with 34.3°
F. In the indoor case, the temperature
declined from 39.4° to 34.3° in 16 minutes (4 x four minute
intervals). In the outdoor case, it
went from 39.4° to 34.3° in 4 minutes (1 x four minute
interval). Assuming the compressor is
working without any breaks, 4 / 16 = 25%. Therefore the energy savings rate will be 1 - 25% = 75%, which is
very close to the result of the equation.
The second test therefore
surpassed the result of the equation [ H = 1 - (Tw
/ Ti )2 ] in
one instance and matched it in another instance. In the first instance, the energy savings rate was greater than
the equation indicated.