Ammonia Air Coolers in Cold Rooms for Storing Apples

Ammonia Air Coolers in Cold Rooms for Storing Apples

Why Ammonia Air Coolers Are Ideal for Apple Storage

The core requirements for apple storage are low temperatures to suppress respiration (delaying sugar depletion and preventing rot), humidity control (preventing dehydration and wrinkling, requiring 85%–95% relative humidity), and minimizing temperature fluctuations in the storage chamber (ideally within ±0.5°C). Ammonia air coolers perfectly align with these needs:

High refrigeration efficiency: Ammonia (R717) possesses substantial latent heat of vaporization (approximately 1369 kJ/kg, significantly higher than fluorocarbon refrigerants). At evaporation temperatures of 0°C to -2°C, it delivers greater cooling capacity per unit time, rapidly offsetting the heat generated by apple respiration (approximately 50–80 kJ/(t·h)) to maintain stable chamber temperatures.

Excellent humidity adaptability: By selecting evaporator designs featuring “low air velocity and large heat exchange area,” the temperature difference between air and evaporator surfaces can be minimized (controlled within 3°C to 5°C). This reduces frost formation rates, preventing sudden humidity drops in the storage chamber caused by excessive frost buildup.

Environmental and cost advantages: Ammonia is a natural refrigerant with an ODP (Ozone Depletion Potential) of 0 and a GWP (Global Warming Potential) of 0, meeting environmental standards. Its low cost and minimal circulation volume result in lower long-term operating expenses compared to Freon systems.