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Fabrication of plate freezer
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Project Zone > Mechanical > Thermal Engineering

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Fabrication of plate freezer

Category : Thermal Engineering


Sub Category : Hotels


Project Code : ITMT04


Project Abstract

Techniques of freezing vary for each application, the type of refrigeration used for preserving fruits cannot suit the need of the fish industries. Later it has been discovered that the number of viable vegetative microorganisms in food are usually greatly reduced by freezing if quick freezing is employed. The conventional freezers could not cope with this higher rate of freezing. By the development of the plate freezer, the challenge of quick freezing has been met to enhance effective preservation. Plate type evaporators may be used in single or in banks. The plates may be manifolds for parallel flow of the refrigerant or they may be connected for series flow. Plate evaporators are especially useful used for liquid cooling installation where unusual peak load conditions are encountered periodically. In the present work, a plate freezer consisting of two plates connected in parallel. Installing formed tubing between two metal plates, which are brazed together at the edges, forms the plate surface evaporators. The refrigerant used is R-134a a refrigerant which is now used as a replacement for R-12.

WORKING PRINCIPLE:

In the plate freezer the evaporator plates are arranged in parallel. The refrigerant after compression enters the condenser where the latent heat is rejected.  Then it is passed through a drier filter to remove moisture and dust particles from the liquid refrigerant. The expansion device used is capillary tube.  The refrigerant enters the evaporator plates which are arranged in parallel. An accumulator is provided before the suction line to prevent any liquid refrigerant entering the compressor.
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