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Specialised Onion Cold Store
Fresh Onion Storage
Onions should not be stored unless adequately cured(dried) either in the field or by artificial means. It is necessary to dry the neck tissues and outer scales until
they rustle when handled, otherwise the bulbs will rot in storage. They can be artificially cured by blowing heated air at 110-115°F (43-46°C) through mesh bags for 8-12 hours or longer.
Onions are held in 60 lb. sacks, slatted crates, in pallet boxes holding about ½ ton of loose onions, in bins, or in large bulk storage. When in sacks, these should be loaded cross-wise or "air-stacked" 5-6 high. The stacks should be set on floor racks. Individual stacks should be separated a few inches to allow free air circulation. Sufficient Airflow of product is adequate. When in crates or pallet boxes, they can be stored one on top of the other to make full use of the storage space. Onions should be held at 32°F (0°C) for maximum quality and shelf life. Storage at ambient temperature may be acceptable for short periods
(1-1.5 months) depending on the variety.
Basis of design for Onion cold Storage-350MT
Proposed Cold storage size : 17.11mtr. x 16.028mtr. x 5.48mtr(H)Ext.dim
Product to be stored : Dry Onion (Red or white)
Storage capacity : 350 MT x 4 nos. = 1400 MT
Storage period : 06 months
Incoming load temp. : 350C
Incoming Quantity : 50 MT/day
Room temperature required : 0 to +2 Deg.C
Relative humidity : Below 70%
Insulation : 100mm PUF panel
Pull down time : +35 to 0 Deg.C within 96 Hours for 50 ton
Ambient temperature : 45 Deg.c
Air ventilation : Suitable Ventilation rate for each cubic meter will be maintained. With adequate CO2 level should be maintained
Inside room air circulation : Heavy duty fans will be provided – 4 NOS. PER
ROOM x 4 ROOMS = 16 FANS
Evaporating unit : Total 03 evaporator units in a room
With Al.Fins, having ref. capacity of 20 Kw x 3 no.
Ducting : Perforated MS duct fabrication 04 nos/room
for recirculating air outlet
Condensing unit : Air cooled condensing unit of 20 kw x 3 nos.
Compressor : Scroll /Semi-hermetic of Copeland / Bitzer /Bock
or any equivalent make.
Refrigerant : R-404a
Electrical supply : 415V / 3 phase/ 50 Hz