3.3.1.4. Carbon dioxide freezer

3.3.1.4. Carbon dioxide freezer

This type of freezer has been known for a long time and uses liquefied carbon dioxide which is usually a by-product of another industrial process.

The liquefied carbon dioxide is injected into the freezer has direct contact with the product. In this respect, it is similar in operation to an LNF. With large units, it is economically feasible to recover the carbon dioxide and about 80 percent of the refrigerant used can be reliquefied. Carbon dioxide can be contained in insulated vessels at a moderate pressure and losses during storage are therefore negligible. High levels of carbon dioxide in the factory air are dangerous, therefore a freezer using this refrigerant must be vented and the gas discharged outside the building. Again, as in the case with other types of freezer which rely on regular supplies of refrigerant, carbon dioxide freezers would not be suitable for use in remote areas.

Last modified: Saturday, 24 December 2011, 11:19 AM