| 摘要 |
This invention relates to an apparatus for continuously providing low temperature refrigerated air for freezing and storage of food products, wherein process air is refrigerated by passing over an evaporator coil. Frost build-up on the evaporator coil is removed by periodically spraying the evaporator coil with a food-grade propylene glycol solution. Entrained liquid propylene glycol droplets are removed as the process air passes through a primary mist eliminator, composed of a series of corrugated plates, and an auxiliary mist eliminator, composed of a flat sheet of woven wire mesh incased between two flat sheets of diamond mesh. The use of demisters enables operation at high air face velocities, which in turn reduces equipment size and increases heat transfer coefficients, resulting in lower heat transfer surface area requirements.
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