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Types for Onion Storage

Based on storage purpose, onion variety, and storage duration, onion storage solutions typically include:

• Fresh Onion Storage Cold Room – short to mid-term storage after harvest

• Long-Term Onion Storage Warehouse – controlled environment for 4–8 months storage

• Seed Onion Storage Room – low-temperature storage to maintain dormancy

• Ventilated Onion Storage Cold Room – enhanced airflow to reduce moisture accumulation

• Large-Scale Onion Storage Warehouse – bulk storage for wholesalers and exporters

Each onion storage type requires different temperature ranges, airflow designs, and humidity control strategies.

What We Need to Learn?

To design the correct onion storage cold room, the following information is required:

Room Dimensions

• Width (m)

• Length (m)

• Height (m)

Storage Temperature

• +0°C to +1°C (long-term storage)

• +2°C to +5°C (short-term storage)

Stored Products

• Fresh harvested onions

• Dried onions

• Seed onions

• Packed or bulk onions

These parameters directly affect refrigeration capacity, ventilation rate, insulation thickness, and total project cost.

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Get a Quote for Onion Storage Cold Room

Tell us your onion storage capacity, target temperature, and storage duration. Hengliangcooling will design a customized onion storage cold room solution and provide a detailed quotation.

Storage Characteristics and Environmental Control

Effective onion storage depends on maintaining a carefully balanced environment that slows respiration, prevents sprouting, and minimizes microbial growth. Unlike many other vegetables, onions require relatively low humidity combined with continuous ventilation to remove excess moisture released during respiration. Typical onion storage temperatures range from +0°C to +5°C depending on storage duration and onion variety. Too much humidity can lead to mold and soft rot, while insufficient airflow can cause localized condensation and uneven quality degradation. A professionally designed onion storage cold room integrates temperature regulation, humidity control, and mechanical ventilation to ensure uniform air distribution across the entire storage space. Hengliangcooling engineers onion storage systems that stabilize internal conditions even during frequent loading and unloading cycles, preserving onion firmness, skin integrity, and market value throughout extended storage periods.

Cold Room Structure and Ventilation Design

The structural design of an onion storage cold room plays a critical role in long-term preservation performance. High-density PU or PIR insulated panels reduce thermal fluctuation and prevent external heat infiltration, while reinforced flooring supports bulk storage loads such as palletized bags or wooden crates. Ventilation systems are carefully calculated to provide sufficient air exchange without excessive dehydration of the onions. Hengliangcooling utilizes optimized air duct layouts, axial or centrifugal fans, and adjustable airflow controls to ensure consistent ventilation throughout the storage room. This design prevents temperature stratification and moisture accumulation in corners or between stacked pallets. Combined with corrosion-resistant evaporators and precise temperature sensors, the onion storage cold room maintains stable conditions that significantly reduce post-harvest losses.

Storage Capacity, Energy Efficiency, and Cost Control

Commercial onion storage facilities often operate seasonally and require cost-effective, energy-efficient solutions to remain profitable. Hengliangcooling designs onion storage cold rooms with energy-saving refrigeration systems, high-efficiency compressors, and intelligent defrost control to reduce operational costs during long storage cycles. Modular cold room construction allows customers to scale storage capacity according to harvest volume, avoiding unnecessary upfront investment. By matching refrigeration capacity precisely to room size, product load, and ventilation demand, the system avoids overcooling and excessive power consumption. This optimized approach ensures that onion storage facilities achieve consistent performance while maintaining low energy usage and predictable operating expenses.

Applications and Hengliangcooling Advantages

Onion storage cold rooms are widely used by farms, agricultural cooperatives, food distributors, exporters, and processing plants that require stable quality control after harvest. Proper onion storage extends shelf life, stabilizes supply chains, and allows producers to sell at optimal market prices rather than immediately after harvest. Hengliangcooling offers complete turnkey onion storage solutions, including system design, equipment selection, installation guidance, and commissioning support. With extensive experience in agricultural cold storage projects, hengliangcooling delivers reliable, durable, and easy-to-maintain onion storage cold rooms tailored to local climate conditions and operational requirements. Customers are welcome to contact hengliangcooling for customized solutions and competitive quotations.