Lecture Notes || SNS Courseware

Subject Details

Dept : FTECH

Sem : 2

Regul : R2019

Faculty : Ms.R.Mohana priya

phone : NIL

E-mail : mohana.r.ft@snsct.org

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Lecture Notes

UNIT 1:

Post -harvest losses in field crops

Wet cleaning

Dry cleaning

Peeling – Flash steam, knife, Abrasion

Caustic and flame peeling

Water activity and its importance

Grading and Sorting – Principles, Types and equipment

Equilibrium moisture content – determination methods

Models, Importance and hysteresis effect

Water activity and its importance

Air screen cleaners

UNIT 2:

Theory and mechanism of drying

Methods of drying agricultural materials

Deep bed drying

Thin layer drying

Drying characteristics of material

Psychrometric chart – application.

Batch and continuous drying

Deep bed drying

UNIT 3:

Spouted bed Dryer, Pneumatic Dryer

Rotary Dryer

Fluidized Bed Dryer

Drum Dryer, Spray Dryer

Vaccum Drying

Freeze Drying

Heat pump drying

Di-electric drying

Micro wave drying

UNIT 4:

Methods of applying heat to food – Blanching

Pasteurization

Sterilization

Thermal death time relations (D, Z and F values)

Process calculation : General method, Ball’s formula method

Sterilization – methods and equipment. UHT sterilization.

UNIT 5:

Chilling – equipments, cold storage

Freezing – Thermodynamics of food freezing

Phase diagram, Ice crystals formation,

Properties of frozen foods

Freezing time calculations

Freezing equipments

Freeze concentration

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