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T he variable retention time (VRT) freezer is used to cool or freeze food products in boxes/cartons or trays. Its major advantage is that it can freeze several different products, each with different freezing times and different size packages using a programmable computer that controls its operation. The VRT (Figure 1) has a series of independent trays that can be loaded into any tray guide at any level. A programmable industrial computer controls the VRT.

Citation: ASHRAE Journal, vol. 44, no. 4, April 2002