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Refrigeration Evaporators

Custom Evaporators - Reversing Airflow Evaporators


Traditionally blast freezing and cooling cells have been designed with airflow moving in one direction only through the product. Research at Colmac Coil using Computational Fluid Dynamics (CFD) software validated by field experience has shown dramatic improvements in both freezing time and product quality when designing for reversing airflow through the product during the freezing (or cooling) cycle. Using recently developed fan blade technology, Colmac offers evaporators with the ability to effectively move air through the product in alternating opposite directions. This new fan technology is cost effective and can be applied to most A+Series™ evaporator configurations.

Using CFD modeling, Colmac engineers can accurately predict airflow patterns and air pressure drop through the product in your facility to optimize the design of your blast freezing or cooling cell. Using reversing airflow evaporator technology has shown freezing times can be reduced by as much as 20% and finished product temperature variations can be reduced to as little as + or - 0.5 deg C. 

Principle of Operation

The design of Reversing Airflow evaporators allows the fan motors to operate fully in two directions of air flow, i.e. forced (blow-through) and induced (draw-through).  This allows the rows of products that are initially in the back of the freezer to be switched to the front, reducing freezing time once the direction is reversed.

CFD Analysis

Colmac can assist you with CFD modeling of your blast cell to predict airflow patterns and fan power requirements.

Capacity Expansion Project, Baja Marine Foods - Ensenada, Mexico

Baja Marine Foods is a subsidiary of Tri-Marine Fish Co. of San Pedro, CA.  It engages in the production and marketing of sardines, calamari, and other small fish.  These products are frozen whole for domestic and international markets, primarily for human consumption.  The project added 4 new Reversing Airflow  retrofitted 4 existing freezers to this technology.  The new Reversible Air Flow freezers have shown a better ability to freeze product, with a decrease in freezing time of 20%.  This represents a substantial energy savings, cost reduction and improvement in product quality.

Mr. Adrian Gutierrez, General Manager, said: "This technology was chosen based on our many years of experience in freezing our products and we have seen that the design offered by Colmac has resulted in shorter freezing times, operating cost savings, and better quality. We are very pleased with the results and plan to continue using the reversing airflow technology in our upcoming projects."

Case Study: J&D Refrigerated Services 

Case Study: Baha Marine

Reversing Air - Highland Refrig
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Blow Through Air Flow Direction Web Size Image
Fishing Boat
  • Shorter freezing times
  • Reduced evaporator power consumption
  • Reduced compressor power consumption 
  • More uniform temperature and quality of frozen product
  • Reduced number of defrost cycles required 
  • Fan motors and controls for 50 or 60 Hz, NEMA or IEC
  • VFD compatible fan motors
  • Insulated drain pan
  • UL listed industrial control panels
  • Factory mounted control valve sets
  • Defrost isolation dampers for energy efficient defrosting
  • Low temperature blast freezing
  • Blast chilling
  • Carcass cooling
  • Low temperature test chambers
  • Cold stores
  • Chill stores
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