Well, we often say "refridjerator," not "refrijerator," so adding the d in the contraction follows the norm of spelling contractions as they sound.
Where the "re" comes from is another question: can it only cool stuff that was cool before?
From the online etymological dictionary: refrigeration: 1471, "act of cooling or freezing," from L. refrigerationem "mitigation of heat," especially in sickness, noun of action from refrigerare, from re- "again" + frigerare "make cool," from frigus (gen. frigoris) "cold." Specifically of "freezing provisions as a means of preserving them" from 1881. Refrigerator "cabinet for keeping food cool" is first recorded 1824, originally in the brewery trade, in place of earlier refrigeratory (1605).
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Where the "re" comes from is another question: can it only cool stuff that was cool before?
From the online etymological dictionary:
refrigeration: 1471, "act of cooling or freezing," from L. refrigerationem "mitigation of heat," especially in sickness, noun of action from refrigerare, from re- "again" + frigerare "make cool," from frigus (gen. frigoris) "cold." Specifically of "freezing provisions as a means of preserving them" from 1881. Refrigerator "cabinet for keeping food cool" is first recorded 1824, originally in the brewery trade, in place of earlier refrigeratory (1605).