A Brief look at key design features of a good blast freezer cabinet:
The main parameters to consider while selecting a Blast Freezer Cabinet to be summarized as follows:
- Good insulation which must be foamed in place to avoid entry of heat through the cabinet walls
- Correctly fabricated plumb doors which are well adjusted with good quality gaskets to provide a perfect seal which will not allow moisture and hot air to enter.
- The defrost water drainpipe must have a P –trap to prevent the ingress of water back into the freezer chamber.
- All openings including electric wires must be completely sealed to prevent moisture entry which could block the evaporator damage portions of the machine where ice gets formed.
- The inner chamber should have coving and a hygienic construction which will facilitate complete washing of the interiors.
Is there an Ideal Air Flow Design For Blast Freezers?
As discussed in our previous post, a Blast Freezer’s evaporator’s face area should be equal to the product storage cross-section area to allow for uniform air flow across the product.
The air has to turn direction 4 times in order to pass over the food, cool the product, then get cooled again in the evaporator and return to the product. For this, all corners need to be coved at a suitable radius to avoid turbulence & a drop in air velocity. Air flow should be unidirectional throughout to prevent turbulence.
Also, air passage needs to be just adequate so as to ensure air passes over the entire food and cools it without getting bypassed around the product. Air velocity should be ~1200 feet per minute.
How can one buy Good Blast Freezers?
It is important to look for a fast pull-down while purchasing Blast Freezers. The capacity of blast freezers should match the production cycle. The manufacturer must understand the production process and offer blast freezers with an adequate cooling capacity to ensure short freeze times keeping in mind the thermal characteristics of the product, batch size, incoming temperature, and the desired core temperature after freezing.Remove featured image
