REFRIGERATION P2

Chia sẻ: Thanh Liem | Ngày: | Loại File: PDF | Số trang:17

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REFRIGERATION P2

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Since a secondary coolant cannot be used below its freezing point, certain ones are not applicable at the lower temperatures. Sodium chloride's eutectic freezing point of -2O0C limits its use to approximately -120C. The eutectic freezing point of calcium chloride is -530C, but achieving this limit requires such an accuracy of mixture that -4O0C is a practical low limit of usage. Water solubility in any open or semi-open system can be important. The dilution of a salt or glycol brine, or of alcohol by entering moisture, merely necessitates strengthening of the brine. ...

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