Technologies
Electroheating™
Rapid Cooling

Publications

About Raztek

Contact Raztek

Search For:




Raztek

© 1998-2005
Raztek Corp.

Raztech Technologies


Rapid Cooling


The Rapid Cooler is the ideal cooling method for heat sensitive products. It combines the advantages of flash and conventional heat-exchange coolers, while avoiding the problems associated with both. The method is very energy efficient, fast, and helps retain the product's original flavor, aroma, and nutritional value.

Key Benefits

Preserves Product's Flavor and Aroma. Flash cooling results in loss of flavor and aroma due to product evaporation; conventional coolers may cause off flavors due to long holding at high temperature. Raztek's cooling method is rapid and involves no vaporization or concentration of the product. As a result, both flavor and aroma are optimally preserved. Flavor preservation is best when connected to an electroheater.

Energy Efficient. Energy removed from hot product is used to preheat the incoming product. Losses of energy to the environment are minimal due to insulation.

Fast. Rapid cooler operates at cooling rates near that of flash cooling. It is much faster than conventional coolers because it utilizes the latent heat of vaporization and condensation to cool and preheat the product. It operates at the point of phase change under vacuum where the heat transfer coefficients are maximal. Conventional coolers use sensible heat for cooling and preheating.

How Does It Work?

The Rapid cooler is made of two sets of coiled tubes in a vacuum chamber. The product to be cooled flows through the lower coil, and the incoming product runs through the top coil. The lower coil is submerged in intermediate liquid.

Rapid cooling works by taking advantage of the high rate of heat exchange during vaporization and condensation of a fluid in absence of non condensible gas. By passing a hot product through a tube that is exposed to a fluid under vacuum, the fluid is quickly boiled by extracting heat from the product. At the same time, a cold product passed through the coiled tube in the space above the boiled liquid will extract heat from the vapors and cause them to condense and fall back onto the hot tube below.

Flash cooling is perhaps the fastest way to cool a product. However, the exposure to low pressure leads to loss of aroma, foam formation and concentration of the product. This Rapid Indirect Vacuum Cooling method gives cooling rates near that of flash cooling of a product without the loss of water and volatile components from the product.

This cooling process can act as a heat regeneration system if the cooling medium used for condensation is the cold product that needs to be heated. A series of multiple coolers can be used to regenerate up to 80% of the heat added to a product.

In principle the Rapid Vacuum Cooler acts in a co-current mode. Rapid chilling is achieved when the condensing coil is fed by a cold fluid at a higher flow rate than that of the product.



Detailed Technical Information

For further information, refer to the following publiction:

Rapid Vacuum Cooler (CIP)



top of page