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|    sci.chem    |    Chemistry and related sciences    |    55,615 messages    |
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|    Message 54,688 of 55,615    |
|    dlzc to jfroge...@gmail.com    |
|    Re: Cold retention    |
|    05 Jun 20 13:04:16    |
      From: dlzc1@cox.net              Dear jfroge...:              On Friday, June 5, 2020 at 12:45:40 PM UTC-7, jfroge...@gmail.com wrote:       > The refrigeration experts told me that an empty       > refrigerator with warm surrounding ambient       > temperatures will almost always run.              Nope. You are taller on one side, because someone has been pulling your leg.        And empty fridge cools down faster, because it has less thermal mass that got       warmer, and then has to cool down.              > With cold absorbing food in the refrigerator,       > the motor will come on just to restore the set       > temperature.              The contents ALSO absorbed heat, got warmer as the "on setpoint" was       approached. So the compressor has to cool all that mass back down.              > This has nothing to do with opening doors or       > cold air flowing out.              ... or any physics whatsoever.              > It is just the way that refrigerators are       > engineered.               No, it is the lying bastards that tricked you.              > Again, the simple question was what contents       > within the refrigerator will retain the cold       > so that the motor/compressor will only rarely       > come on? The refrigerator is accessed only       > about once a month.              Air is the lowest mass content. Styrofoam is also low mass, because it is       mostly air. The amount of time a perfectly good unit runs, is based on the       heat rate coming into the box, and the total mass that has to be cooled down.        Increase the mass to be        cooled, and you make the unit come on longer, if less often.              I know you don't want to believe me, but I am not lying to you. Draw a free       body diagram, show heat coming in...              David A. Smith              --- SoupGate-Win32 v1.05        * Origin: you cannot sedate... all the things you hate (1:229/2)    |
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