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Old 20-12-2012, 07:33   #16
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Re: I don't need a freezer !

Hi i started a long thread here about living without a fridge and that becomes a long discussion. I am happy you think the same way. We are not real veggies now but i assume we will check this style when moving to the boat necxt year.

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Old 22-12-2012, 06:40   #17
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Re: I don't need a freezer !

Originally Posted by Panope View Post
Adding to the above post:

Another reason having a full fridge (no air) may reduce power consumption is that it reduces the amount of cold air that spills out of the space when the door is opened. This is probably a big factor when dealing with a front loading fridge design, and a small factor when dealing with a top loading design as the cold air tends to stay inside via gravity (cold air heavy).

Actually, there is very, very little heat, astonishingly little heat in the amount of room temperature air which would be needed to replace 25 liters of air which might spill out of a fridge like Mark's. The specific heat of air is about 1kJ per kg per degree K, less than 1/4 the specific heat of water. And one liter of air at 15 degrees and at normal atmospheric pressure has a mass of only 1225 grams per cubic meter, or 1.225 grams per liter, nearly 1000 times less the mass of a liter of water.

So as a result of all that, 25 liters of air at a given temperature has less heat in it than 7 milliliters of water at the same temperature. To put it another way -- if you put one single warm Coke in your fridge, you have put more heat into it than if you spilled all the air out of it 43 times.

Net net -- don't worry about displacing the air in your fridge, and don't worry about the air spilling out of it.

The big advantage of top loading fridges is that if the door gasket is not perfect, then there will be less exchange of air with the cabin by convection. But a front loading fridge with a perfect gasket will be hardly less efficient than a top loading fridge with a perfect gasket.

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Old 22-12-2012, 07:23   #18
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Re: I Don't Need a Freezer!

Interesting that we asa group here have changed our views about the empty air. years ago all you would read is how that air was causing lost cooling and people would talk about putting empty bottles in the box to help this. Now it seems we don't feel the air really matters.

Maybe a sign that we have more engineers etc here who know basic heat transfer.

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