Ice Box ice usage   Leave a comment

So remember how I mentioned that I want to use a small solar powered freezer?  Specifically, this is the freezer I want:

The Sundanzer 50L Why a freezer?  Because if you have a freezer you have ice, and if you have ice, you can refrigerate.  Thus, a freezer grants you both the ability to freeze and the ability to refrigerate. A straight refrigerator grants you only the ability to refrigerate. Why choose one or the other?  Because you have to use a chest type, for efficiency. Chest type reefers are more efficient for a variety of reasons, but the biggest is that they don’t dump all their cold air out every time you open the door. In fact, you can strongly reduce your power usage by just turning a Chest type into a refrigerator by putting a refrigerator thermostat in it.  But the point here is that no one makes dual compartment chest types.  The freezer and reefer unit have to be separate,  so if you can only get one, get the freezer.  Why the Sundanzer 50L?

The Sundanzer because it has 4″ of high quality insulation and uses the same premium compresser that all high end, high efficiency units use.  The 50L because it is the smallest, lower power using one they have.  It only uses about 100W  a day.  That’s the same energy requirement of using a microwave for about 6 minutes, or two bags of popcorn.  That’s why you can use solar power for them.  The idea hear is make a real, old fashioned icebox (only with premium 4″ insulation), and us that as a refrigerator while using the SunDanzer to make ice for it.  How much ice?

Today’s handy fact: Ice use in a well designed icebox is around 1 lb of ice per cubic foot per day.

A 50 quart cooler (The Model T of coolers) has a capacity of 1.671 cubic feet, you’d expect it to use 1.671 pounds of ice a day. Premium stock coolers are listed as staying cool for 5-7 days. That’s 8.3 to 11.7 lbs of ice which takes up 16.6-23.4 quarts. which is approximately 1/3 to 1/2 of capacity…perfectly in line with manufacturer recommendations, and confirming the 1 lb per cubic foot per day.

Finally, the first electric refrigerator for the middle class, the GE Monitor Top was 5-7 cubic feet. GE chose that size because it was a close approximation of the average icebox of the late 1920’s. Going with the above formula, the average icebox should have used between 5-7 lbs of ice a day. Ice came in 25 or 50 lb blocks, so you would need around two 25 lb blocks a week or one 50 lb block. Which if I recall, is reasonable reports of people who remember using iceboxes.  How big is a 25 lb block of ice? 10″x10″x7″ is the standard.


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