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Old 10-14-12, 02:35 PM   #11
Mikesolar
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Quote:
Originally Posted by Xringer View Post
What if you had a few spare compressors laying around??
Compressors that were going to be tossed in the trash next summer..

~~~

Maybe another thing to consider, would be compressor life.
If compressor #2 only ran 50% of the time, wouldn't the system last twice as long?
(Assuming that running up the compressor hours puts wear on it's motor etc).

A little off-topic:
I'm basing that 'life' idea on my Sanyo Theory.
Which is: Running both Sanyos at 450 watts(each) to keep the house warm,
is better then leaving one unit off, and running the other at 900 watts..

Since they don't come on as much (run time), with both of them running, it's easier on both.
If one unit was going to last for 5 years, maybe both will last for 10 years..?.


Plus, when it gets really cold, and each unit is running at .8 to 1.2 kW,
one Sanyo alone would need to crank up to 1.6 to 2.4 kW.
(Above 2.4 kW, the 10A breaker would kick in).
It seems like it would be better not to run them at high power levels..

My pin-hole R410A loss experience tends to make me think that high power/high pressures are hard on copper tubes..
No compressor likes a high number of start/stops per hour and they are most efficient and last longer when run close to continuously so I would try to keep one in an optimal (lower dP) for as long as possible.
I think I have some sanyo curves somewhere. Most fridges here are 134a, I believe.

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Old 10-14-12, 07:18 PM   #12
Ryland
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You also want to keep your coolant lines as short as possible because that will put more strain and wear on the compressor as well.
I don't think you are going to see a drastic change unless you can fill the area that had the compressor with insulation.
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Old 10-15-12, 09:49 AM   #13
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I found a hotspot on the outside lower part of the side of my fridge this morning using an infrared thermometer. It was reading over 100 degrees. Will do some searching of hotspots on the inside later today.
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Old 10-17-12, 10:56 AM   #14
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For comparison this is mine: Coils 10 degrees above ambient and compressor 30 degrees above ambient towards the end of the previous defrost that I triggered, which takes about 30 minutes compressor runtime to recover from. So coils were 68 and the compressor was 88. The air exhausting was cooler than the coils and the area behind the refrigerator was pretty much ambient. 58 degrees and it operates at 135 watts towards the end of the run, when it's 70 in the house it pulls 150 watts. Overall much less energy usage when its cooler with both energy usage while running, lower dew point for less frost(probably moving to every other week defrosts), lower cooling load, and faster cooldowns.

Keep those coils clean and fed with cool air once you've got everything mounted up and you're set.

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