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by userbinator
1789 days ago
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People experimented with CO2 refrigerant around the end of the 19th century, when refrigeration had just been invented and most other refrigerants hadn't been invented yet; it was called "carbonic acid" and required much heavier machinery due to the high pressures. (Typically over 1000PSI for CO2, compared to 100-200PSI for HC, CFC, and HCFC.) |
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