Chilled and frozen food technology

A.Y. 2017/2018
Lesson for
Overall hours
Learning objectives
The aim of the course is to provide students with the fundamental principles and methods for low-temperature food storage. The main systems and equipments used for chilled/frozen food production and storage will be discussed, as well as the major quality attributes of raw materials and chilled/frozen foods.
At the end of the course and after the final exam, the student will be able to:
- Write technical sheets for raw materials and chilled/frozen foods.
- Plan and optimize frozen food and ice cream composition and processing parameters in order to assure product safety and quality.
- Organize and manage the cold chain to guarantee chilled and frozen food quality.
- Co-operate to the development of new products and to the improvement of production process.

Course structure and Syllabus

Active edition
Field activity: 8 hours
Lessons: 28 hours
Professor: Alamprese Cristina
Methods and equipments for pre-refrigeration and storage of fresh vegetables and fruits, with or without modified atmosphere. Minimally processed refrigerated fruits and vegetables: production process and quality attributes.
Refrigeration cycle and equipments:
Pressure-enthalpy diagram. The ideal and the real vapour-compression cycle. Properties and environmental impact of refrigerants. Components of a vapour-compression refrigeration system: compressors, condensers, expansion valves, and evaporators. Household refrigerators and freezers.
Fundamentals of freezing:
Ice formation kinetic. Freezing curves of pure water, solutions, and foods. Physical and chemical changes during freezing and frozen storage in plant and animal tissues. Thawing kinetic.
Quick-frozen foods:
Quick frozen foodstuff legislation. Facilities for the cold chain.
Freezing methods and equipments:
Air convection freezing: heat transfer coefficient, weight loss, defrost systems. Air blast, fluidized bed, and impingement freezers. Contact freezing: plate, drum, and belt systems. Liquid immersion and cryogenic freezing: principles and equipments. Freezing process selection criteria (costs, yield, product quality).
Production processing:
Frozen fruit and vegetable production: quality attributes and processing lines.
Production of frozen fish, shellfish, and related products: quality and safety attributes, processing lines.
Artisanal and industrial ice cream production: ingredient functionalities, processing lines, quality attributes.
Teaching methods
Copia delle slides proiettate a lezione e appunti del corso.
Dispensa a cura di C. Alamprese e E. Casiraghi "Appunti del corso di Tecnologia delle Applicazioni Frigorifere" edita dalla CUSL (2a edizione).
Lesson period
First semester
Lesson period
First semester
Assessment methods
Assessment result
voto verbalizzato in trentesimi