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Grain Chiller for Grain Storage Silos (Vertical Steel Silos / Flat Grain Depots)
Core Storage Target Parameters (Global Standard FAO / GB/T 29374)
Safe grain storage temp: ≤15°C long-term storage; ≤23°C summer temporary storage
Supply air RH: 60–65% RH (balance grain moisture, avoid condensation/mildew)
Airflow rate for silo aeration: 2–4 L/s per ton grain (slow uniform cooling through grain bulk)
Cooling purpose: Stop grain respiration, kill insect larvae, reduce chemical fumigation, prevent weight loss & mycotoxin
Unit Core Structure & Special Design
Multi-stage Filtration (Anti-grain dust, husk):
Stage1: Washable metal mesh filter (block chaff, coarse grain dust)
Stage2: G4 pre-filter, easy quick-release frame for frequent cleaning
Cooling + Refrigerant Hot Gas Reheat Section (Mandatory): Oversized evaporator coil for deep dehumidification; built-in refrigerant reheat to stabilize outlet air temp & RH, avoid over-cooling grain moisture loss
High Static Centrifugal Fan: Static pressure ≥300–600Pa, push cold air through silo bottom perforated aeration floor, upward air flow through grain pile (optimal pressure ventilation)
Anti-corrosion Casing & Drain System: Hot-dip galvanized frame + epoxy powder coated panels; full stainless steel sloped drain pan + deep P-trap, prevent condensate backflow & algae growth
Compressor & Climate Adaptation: Semi-hermetic / scroll compressor; high ambient upgrade for desert 55°C outdoor installation; crankcase heater for cold winter regions
Intelligent Grain Dedicated PLC Control: Auto monitor silo grain temp, supply air T/RH, ambient weather; auto start/stop cooling cycle; fault alarm for high/low pressure, filter blockage; compatible grain monitoring BMS system
Working Principle for Silo Cooling
Cold dry air is blown into silo bottom aeration ducts → flows upward through grain bulk → absorbs grain internal heat → warm humid air exhausts from silo top vents; gradually lower whole grain pile temperature evenly without local hot spots
