6. Ice
- Use of ice / water mixture
- Effective heat transfer
- Process is a hydrocooling
- Chill product in bulk in short time
- Constant temperature
7. Vacuum
- Used to solid product with large surface area to volume ratio
- Product is chilled in a vacuum chamber
- Heat is removed through evaporative cooling
- Rapid and economical
- Capital cost is high
8. Cryogenic
- Liquid nitrogen or solid carbon dioxide is used
- Heat is needed to boil the refrigerant
- Cooling rate is high
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