Refrigeration Question - SailNet Community

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  #1  
Old 09-04-2013
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Refrigeration Question

OK, Donna and Schock, and any other refrig experts:
I need to replace a 20+ year old Adler Barbour Cold Machine. It has worked hard doing a pretty good job in a factory ice box, about 5-1/2 cu ft with only 1" of insulation.
I don't need all that refrig space and I can't access the outside of the box, so I added 2" foam on the inside-- bottom, top, and all sides. My new box is nice and tight. This should ease the work on the unit considerably. Of course, I cut my refrigerated space down quite a bit, also-- down to about 3 cu ft, but this is enough for me.
My question is, should I replace the no longer working Cold Machine with the same size unit, which is rated for 7+ cu ft, or install a smaller unit, rated at 3-4 cu ft?
Which is more efficient- to have a larger compressor/evaporator that doesn't have to work as hard, or a smaller unit that will draw fewer amps while cycling, but I assume will have to cycle longer?
Any other considerations in sizing?
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Old 09-05-2013
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Re: Refrigeration Question

I'd call Seafrost and get a replacement Danfoss compressor, and the compression fittings to splice-in the new compressor after removing the old one.

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Old 09-05-2013
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Re: Refrigeration Question

Is it still working? Refrigeration equipment doesn't work hard or harder or less in the sense most people think. It just runs longer or shorter cycles the energy draw is about the same. It was working fine all those years and you made the box smaller, I know why you did it. But it just seems like a bit over overkill with insulation. So save the $900+ if it's still working for now.
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Old 09-06-2013
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Re: Refrigeration Question

It's a hard call which would be more efficient. The smaller compressor may draw less but it will run longer. The larger unit will pull the box and it's contents down to temperature faster. The larger unit might short-cycle a bit but I don't think it would be a big issue on a small cap tube system like that. Perhaps the biggest consideration would be the size of the components. The larger unit will have a larger evaporator plate so you want to make sure it would fit in your newly downsized box. The condensing unit might also be bigger, although probably not by much.

If you want to make ice or hold ice cream you might want to go with the larger unit!
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