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Modified compressor.
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nctnico:

--- Quote from: james_s on March 28, 2021, 05:46:51 pm ---It all adds up to a machine that can reliably run many tens of thousands of hours. Compressor failure in a refrigerator is quite rare, the vast majority of refrigerators get replaced because things like door seals, hinges or shelves break or they're just out of style.

--- End quote ---
I disagree here. At some point the bearings in a compressor will wear out which causes a refridgerator to become very noisy.
james_s:

--- Quote from: nctnico on March 28, 2021, 06:12:59 pm ---
--- Quote from: james_s on March 28, 2021, 05:46:51 pm ---It all adds up to a machine that can reliably run many tens of thousands of hours. Compressor failure in a refrigerator is quite rare, the vast majority of refrigerators get replaced because things like door seals, hinges or shelves break or they're just out of style.

--- End quote ---
I disagree here. At some point the bearings in a compressor will wear out which causes a refridgerator to become very noisy.

--- End quote ---

At some point yes, nothing lasts forever but how many compressor failures have you seen? It's a fact that most refrigerators (at least in the USA) are replaced for reasons that do not involve the hermetic system. It's also a fact that there are thousands if not millions of decades-old refrigerators still working. The refrigerator, despite being an electromechanical system with moving parts that runs for hours every day is one of the most reliable and long lived appliances in the average home.

Even in the failed compressors I've torn down, only one of them had a bearing failure and it was a super cheap water cooler. It had only a single bearing in the middle between the compressor and the motor with the other end of the shaft just floating. The rest have been other things, refrigerant charge lost resulting in a burnout, saw a blown gasket on the discharge line in one, broken reed valve in another. None of those failed ones were in domestic refrigerators though.
SilverSolder:

--- Quote from: james_s on March 28, 2021, 07:19:26 pm ---
--- Quote from: nctnico on March 28, 2021, 06:12:59 pm ---
--- Quote from: james_s on March 28, 2021, 05:46:51 pm ---It all adds up to a machine that can reliably run many tens of thousands of hours. Compressor failure in a refrigerator is quite rare, the vast majority of refrigerators get replaced because things like door seals, hinges or shelves break or they're just out of style.

--- End quote ---
I disagree here. At some point the bearings in a compressor will wear out which causes a refridgerator to become very noisy.

--- End quote ---

At some point yes, nothing lasts forever but how many compressor failures have you seen? It's a fact that most refrigerators (at least in the USA) are replaced for reasons that do not involve the hermetic system. It's also a fact that there are thousands if not millions of decades-old refrigerators still working. The refrigerator, despite being an electromechanical system with moving parts that runs for hours every day is one of the most reliable and long lived appliances in the average home.

Even in the failed compressors I've torn down, only one of them had a bearing failure and it was a super cheap water cooler. It had only a single bearing in the middle between the compressor and the motor with the other end of the shaft just floating. The rest have been other things, refrigerant charge lost resulting in a burnout, saw a blown gasket on the discharge line in one, broken reed valve in another. None of those failed ones were in domestic refrigerators though.

--- End quote ---

The shelves are really cheaply made nowadays.  I have to replace shelves every few years as the plastic simply cracks eventually.

Next time, I'm going to pour some epoxy into them to add some strength...
nctnico:

--- Quote from: james_s on March 28, 2021, 07:19:26 pm ---
--- Quote from: nctnico on March 28, 2021, 06:12:59 pm ---
--- Quote from: james_s on March 28, 2021, 05:46:51 pm ---It all adds up to a machine that can reliably run many tens of thousands of hours. Compressor failure in a refrigerator is quite rare, the vast majority of refrigerators get replaced because things like door seals, hinges or shelves break or they're just out of style.

--- End quote ---
I disagree here. At some point the bearings in a compressor will wear out which causes a refridgerator to become very noisy.

--- End quote ---
At some point yes, nothing lasts forever but how many compressor failures have you seen?

--- End quote ---
Well our own a couple of months ago (after 20 years of service) and I heard the one from the neighbours loud & clear a couple of years ago.

amyk:
Maybe there's something about these relatively newer (more "environmentally friendly"? ::)) systems that causes them to fail more often --- they could be giving them barely enough oil to begin with, a carefully calculated amount that ensures the bearings will wear out.
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