Scraped Surface Freezer – Surface Chilling

Industry: Fruit and Vegetables (NAICS 3114)

NAICS process:

 

311411 Frozen Fruit and Vegetables

311412 Frozen Specialties

 

Process Brief: Liquid or semi-solid foods are frozen on the walls of a barrel and are removed by scraping

 

Energy source: Electricity/ some Natural Gas

 

Energy Intensity: 250-1,700 Btu/lb of product

 

Scraped surface freezers are specialized systems for freezing liquid or semi-solid food, especially ice cream. The food is spread over the inside walls of a freezer barrel, which is chilled by jackets containing ammonia, brine or other refrigerants. Applying the food in a thin film allows rapid freezing (less than 10 seconds) with very small ice crystals. A rotor scrapes the product from the barrel walls and the product is collected for additional freezing.

 

Scraped surface freezers are chilled by mechanical (electricity) or thermal (natural gas) systems. This freezer has found few applications outside of ice cream production.