Industrial Refrigeration For Food Preservation
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1 Industrial Refrigeration For Food Preservation Dr. Apichit L. Pana (Ph.D.(Hon), ME) Fellow ASHRAE Distinguish Lecturer (DL) and Student Activities Committee of ASHRAE USA Industrial Refrigeration for Food Preservation ādāb arz hai Sawasdee Ka 1
2 NETWORK GROW LEARN TEACH SHARE This ASHRAE Distinguished Lecturer is brought to you by the Society Chapter Technology Transfer Committee Volunteer! Become A Future Leader in ASHRAE Write The Next Chapter In Your Career ASHRAE Members who attend their monthly chapter meeting become leaders and bring information and technology back to their job. You are needed for: Membership Promotion Research Promotion Student Activities Chapter Technology Transfer Technical Committees Find Your Place in ASHRAE! Visit ashrae.org. 2
3 Outlines Product Lost Fruits & Vegetables Fishery PRODUCT LOST 3
4 Product Lost Causes:- Weight loss in storage and freezing Chilling injury Freezing injury Ammonia injury Percentage of Weight (Moisture) Loss from Fruits and Vegetable that Affects Produce Quality after Harvest Product Weight Loss (%) Beans (broad, runner, snap) 6.0, 5.0, 41.0 Broccoli 4.0 Cabbage 8.0 Carrots (mature, young) 8.0, 4.0 Celery 10.0 Cucumbers 5 Lettuce 3.7 Onions 10.0 Potatoes 7.0 Spinach 3.0 Sweet Corn 7.0 Tomatoes 7.0 4
5 Weight loss during storage Weight lost during freezing Factors:- Room temperature & temperature fluctuation Humidity Air flow over the product Radiation effects of lighting Shape and size of the product Type of wrapper Factors:- Type of freezer Freezing time Type of product Air velocity Freezer operating conditions 5
6 Weight lost during freezing Product Freezing Method %weight loss IQF shrimp Air blast 2 to 2.5 IQF haddock Air blast 1.2 IQF haddock Cryogenic CO2 0.6 IQF products Cryogenic N2 0.3 to 0.8 Tray of fillets Air blast 1.0 Large fish or blocks Air blast 0.5 Blocks of fish Contact freezer metal to fish contact 0 Chilling Injury 6
7 Freezing Injury Freezing Injury Freezing Large ice crystals damage cell wall Thawing Cell wall has been ruptured Slow Freezing Freezing Small ice crystals Thawing Cell wall intact Quick Freezing 7
8 Ammonia Injury FRUITS & VEGETABLES 8
9 Fruits & Vegetables Pre-cooling method Green Bean & Soya Bean Shallot (Red Onion) Banana Ripening Mango CA Vegetables Postharvest General Flow Harvest Bulk Pallet Bin Containers Containers Palletized Wash Bulk Pallet Bin Containers Containers Palletized Cure Pre-cool Store Wash Grade Bulk Pallet Bin Containers Containers Palletized Ship Market 9
10 Fruits Postharvest General Flow at Packinghouse Load to Pre-cooler desired condition Unload from Pre-cooler Packing Fresh fruits Load into wax m/c Water spray cleaning Inspection Water spray brushing Surface water removal Wax emulsion coating with brush & spray Drying with fan & heater Grading by size Packing Cold storage Transport Load into ripening room desired condition Unload from ripening room Packing Fruits & Vegetables Commodity Max. transit & Shelf life (Days) Opt. transit temp. ( C) Highest freezing temp. ( C) Recomm. container temp. setpoint ( C) %RH Air Change (cfm) Ethylene Production Rate Sensitivity Beans, Green Low M Broccoli VL High Cabbage VL High (White) Cantaloupes High M Carrot, VL Low Topped Celery VL M Cucumbers Low High Eggplant Low Low 10
11 Fruits & Vegetables Commodity Max. transit & Shelf life (Days) Opt. transit temp. ( C) Highest freezing temp. ( C) Recomm. container temp. setpoint ( C) %RH Air Change (cfm) Ethylene Production Rate Sensitivity Lettuce Low M (butterhead) Onions, VL Low Green Onions, M M Dry Spinach VL High Strawberries Low Low Sweet Corn VL Low Tomatoes, breaker to light pink M High Pre-cooling Methods for Fresh Produce Top Icing Hydro Cooling Hydrair Cooling (air + cold water spray), Wet Air Cooling Air Cooling Room Cooling Force Air Cooling Vacuum cooling 11
12 Top Icing Hydro Cooling 12
13 Hydro Cooling Evaporator Cooled Product Out Water Distribution Pan Water Reservoir Continuous Flow Shower Type Hydrocooler Hydro Cooling Refrigera tion System Water Pump Water Distribution Pan Bins Evaporator Water Reservoir Batch Hydrocooler 13
14 Hydro Cooling Cooled Product Out Flighted Conveyor Immersion Tank Evaporator Continuous Flow Immersion Type Hydrocooler Hydro Cooling Refrigeration System Refrigerant Circulate Pump Ice/cold Water Storage Tank Hydrocooler Chilled Water 1 ~ 4 C Thermal Storage Immersion Hydrocooler 14
15 Hydrair Cooling System, Wet Air Cooling System Wet Air Cooler Evaporative Condenser Ice Water Cold, Humid Air Produce Compressor Ice Chiller & Water Tank Cold Room Hydrair Cooling System, Wet Air Cooling System 15
16 Hydro-Force Cooler (HAC) Hydro-Force Cooler (HAC) High Humidity Air Supply Drift Eliminator Water Spray Evaporator Air In Circulate Pump 16
17 Room Cooling Recommended Temperature (TD) for Four Classes of Foods (Forced Air Unit Coolers) Class TD RH Suitable for F (~5 C) F (~7 C) F (~9 C) F (~12 C) 90% Fruits, vegetables, flowers, unpacked ice, chill room 80-85% General cool room, packed products 65-80% Beer, wine, pharmaceuticals, short term packaged products, tomatoes, onions, and tough skin fruits e.g. melons 50-65% Processing rooms, cutting rooms, candies, loading docks 17
18 Forced-Air Cooling Cold-wall Fan Evaporator Cold-wall Fans Produce Cold Room Air In Produce vent open when pallet is pushed against bumper Tunnel type FAC using cold-wall system Force Air Cooling 18
19 Force Air Cooling Canvas System Force Air Cooling Canvas System 19
20 Force Air Cooling Canvas Free System Force Air Cooling Air Bag (Vertical Air Circulation) 20
21 Vacuum Cooling Typical schematic of a vacuum cooler Condenser Evaporator Produce Compressor Condensate Vacuum Chamber Vacuum Pump Vacuum Cooling 21
22 Vacuum Cooling Vacuum Cooling Some vegetables that can be vacuum cooled:- All leafy vegetables Any type of lettuce Asparagus Bell pepper Bok choy Brussel sprouts Cabbage Carrots Cauliflower Celery Cucumbers Endive Escarole Green peas Leeks Mushrooms Oriental vegetables Parsley Prepack coleslaw Prepack spinach Radishes Romaine Snap beans Spinach Squash 22
23 Compare Cooling Methods for Fruits and Vegetables Typical cooling time (hr) Product moisture loss (%) Water contact with product Potential for decay contamination Room Cooling Vacuum Cooling FAC Hydro Cooling Top/Liquid icing 20 to to to to to to to to to 0.5 No data No No No Yes Yes, unless bagged Low none Low High Low Capital cost Low Medium Low Low High Energy efficiency Low High Low High Low No No No Yes Yes Water-resistant packing needed Portable No Common Sometimes Rarely done Common No No Rarely done Yes Rarely done Feasibility of in-line cooling Recommended Cooling Methods for Fruits and Vegetables Commodity Vacuum Cooling Room Cooling Forced Air Cooling Hydro Cooling Top/ liquid icing Beans/snap Y Y Y Y Broccoli Y Y Cabbage Y Y Cantaloupe Y Y Carrot Y Y Celery Y Y Y Cucumbers Y Y Egg Plant Y Y Green Onions Y Y 23
24 Recommended Cooling Methods for Fruits and Vegetables Commodity Vacuum Cooling Room Cooling Forced Air Cooling Hydro Cooling Top/ liquid icing Lettuce Y Y Potatoes Y Y Spinach Y Y Y Strawberries Y Y Sweet-corn Y Y Sweetpotatoes Y Tomatoes Y Green Been & Soya Been 24
25 Green Been & Soya Been Max. transit & Shelf life (Days) Opt. transit temp. ( C) Highest freezing temp. ( C) Recommended container temp. setpoint ( C) %RH Air Change (cfm) Ethylene Produc-tion Rate Beans, Green Low Green Been & Soya Been Weighing Quality Control (Sampling) Bulk Storage (Wet Air, FAC) Blowing Foreign Material Washing (Sand, Mud) Sorting, Size Grading Trimming (Tail, Head) Cleaning Blanching Quick Chilling (By Chilled Water) Fluidize Bed Freezing (IQF) Weighing & Packing Cold Store Export 25
26 Shallot (Red Onion) Processing Fruits & Vegetables Onions, Green Onions, Dry Max. Opt. transit Highest Recomm. %RH Air Change Ethylene container transit & temp. ( C) freezing (cfm) temp. Production Shelf life temp. ( C) setpoint Rate (Days) ( C) Very Low Medium 26
27 HARVEST Fully mature, well colored, and 1-2 inches in diameter. Cure in the sunlight, sacks, or bins, or under cover. Shallots are usually hand cleaned, topped and put into bags or bins for storage after the necks and bulbs are well cured. Storage Store at 0~1 C and 60-70% RH. Should not be place into deep piles. Good air movement is critical. 8 to 10 months. 27
28 Postharvest Treatments Maleic hydrazide (Royal MH-30) Two lb a.i. per acre when bulbs are fully mature with soft necks and 5 to 8 green leaves or approximately 50% of the tops have fallen, but are still green. Applied at temperatures below 80 to 85 F. Suggest to use a spray adjuvant in some arid regions. Avoid early sprays before maturity. Do not treat seed shallots. Banana Ripening 28
29 Fruit Ripening What is Fruit Ripening? Climacteric Fruits Non-Climacteric Fruits Climacteric Fruits Banana Apricot Papaya Kiwi Apple Guava Plum Figs Passion Fruit Mango Pear Sapota 29
30 Non-Climacteric Fruits Strawberry Blackberry Pomegranate Grape Raspberry Orange Mousambi Litchi Watermelon Ripening Conditions for Some Kinds of Fruits Fruit Exposure time (hours) 1 To 100ppm ethylene Range of ripening temperatures 2 Avocado ºF/ 15-20ºC Banana ºF/ 14-18ºC Kiwifruit ºF/ 12-22ºC Mango ºF/ 20-22ºC Pear ºF/ 20-22ºC Tomato ºF/ 18-20ºC 1 Shorter duration for more mature fruit 2 Faster ripening rate at higher temperatures 30
31 Banana Ripening Banana Max. transit & Shelf life (Days) Opt. transit temp. ( C) Highest freezing temp. ( C) Recommended container temp. setpoint ( C) %RH Air Change (cfm) Ethylene Produc-tion Rate Banana Medium 31
32 Banana Ripening Four major factors:- Relative Humidity (RH) control Ethylene gas Temperature control (pulp temperature) Air circulation Banana Ripening Low relative humidity accelerates water loss and appearance of physical damage symptoms on banana 32
33 Approx. daily pulp temperature desired for bananas scheduled to complete ripening in specified number of days Ripening schedule Day 1 Fruit temperature ( C) on day - Day 2 Day 3 Day 4 4 days Day 5 Day 6 Day 7 5 days days days Banana Ripening Green bananas Load into ripening room Refrigerate for hrs until pulp (core) temp. reaches C, 90%RH Close room and control C (3-4 days), 75%RH Vent ethylene Discharge Ethylene into room to 0.1% concentrate (1 day) 33
34 Banana Ripening Banana Ripening 34
35 Banana Ripening Mango 35
36 Mango Max. transit & Shelf life (Days) Opt. transit temp. ( C) Highest freezing temp. ( C) Recommended container temp. setpoint ( C) %RH Air Change (cfm) Ethylene Produc-tion Rate Mango Medium Export Fresh Mangos Process Flow Hand harvest into baskets, nets or buckets Remove latex Transfer to field lug boxes (shaded) Transfer to packinghouse Hot water quarantine treatment Pre-size for hot water treatment presort defect Portable water brush & rinse Dump into chlorinated water Hydro cooling Rest hrs at ambient temp. Transfer to packing line & wax application Grade according to buyer requirements Move pallets to cold storage room prior to shipping Forced Air cooling Palletizing & strapping Pack fruit into cartons by size 36
37 Ripen Mangos Process Flow Ripen Mangos Clean & Rinse Peel Cut Freeze (Air Blast, Tunnel) Vacuum Pack Freeze Dry Pack Cold Storage CONTROL ATMOSPHERE (CA) 37
38 Control atmosphere (CA) Control atmosphere (CA) Membrane type Nitrogen Generator PSA type Nitrogen Generator 38
39 Control atmosphere (CA) VPSA type Oxygen Absorbers Carbon Dioxide Absorbers Control atmosphere (CA) Ethylene Scrubber 39
40 Control atmosphere (CA) CA Door Control atmosphere (CA) Analyzer 40
41 Control atmosphere (CA) Air bags to equilibrate pressure in controlled atmosphere rooms FISHERY 41
42 Fishery Freezer Trawler Fish Surimi Shrimp Freezing Technology Frozen fish Fatty (carp, salmon, sardine, tuna) Lean (cod, pollock, perch) Shrimp, Scallops Max. transit & Shelf life (Days) Opt. transit temp. ( C) to to to Highest freezing temp. ( C) Recomm. container temp. setpoint ( C) to to to %RH Air Change (cfm) Vents closed Vents closed Vents closed Ethylene Production Rate None None None Crab, lobster to to Vents closed None 42
43 Freezer Trawler Freezer Trawler Ice Machine for trawler chip ice from freshwater chip ice from fresh or seawater liquid ice from seawater 43
44 Fish Processing Fish Processing Receiving (Fresh or Frozen Fish) Unpacking Thawing (in water) Washing & Grading Skinning Evisceration & removal of valuable by products (liver, milt) Filleting Rejected fish Rejected fish Skin Guts, head By-product By-product material Fish meal & fish oil Process Dehydrating Washing Bones, off-cuts reject Chilling, freezing, salting, drying packing QC reject External Packing 44
45 Fish Processing Fish Fillet Surimi Fish Finger Surimi Raw Material Chilled and washed in ice water (6 C) Heading and Gutting washed in ice water (6 C) Deboner Leaching Hydraulic press Pressed Meat Strainer/ Refiner Mixing Packing Contact freezing (-40 C) Packing Cold storage (-18 C to -20 C) 45
46 Shrimp Processing Shrimp Processing Weigh Tray pack Freeze Overwrap Dust- Batter Bread Fry I.Q.F. Harvest Store De-head Grade Peel Cook I.Q.F. Glaze Weigh Pack Store Ship Weigh Place in block tray Block freeze Knock out Glaze 46
47 Freezing Technology Brine Freezer Contact Plate Freezer Spiral Freezer Tunnel Freezer Fluidized Bed Freezer Cryogenic Freezer Brine Freezer 47
48 Brine Freezer Brine Freezer Before After 48
49 Air Blast Freezer Contact Plate Freezer 49
50 Spiral Freezer Tunnel Freezer 50
51 Fluidized Bed Freezer Fluidized Bed Freezer 51
52 Cryogenic Freezer Industrial Refrigeration For Food Preservation Q & A For more information please to apichit.lpana@itc-group.co.th Tel:
53 Industrial Refrigeration For Food Preservation Thank You For Your Attention. shukrīā Kob Khun Ka 53
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