Dehumidifier for Cold Storage: Effective Anti-Ice Rotor Technology Solution from DeAir

Dehumidifiers for Cold Storage: The Optimal Solution for Humidity Control from DeAir

High humidity is a major challenge for many industries in Vietnam, causing negative impacts on product quality, equipment life and working environment. Especially in the cold storage environment (including both cool and frozen storage), humidity control becomes extremely important to effectively preserve goods. Industrial dehumidifiers were born as an essential solution to solve this problem. This article will analyze in depth the humidity requirements in cold storage and introduce suitable industrial dehumidifiers, especially solutions from reputable manufacturer DeAir.

Why is humidity control so important in cold storage?

Cold storage operates at very low temperatures, which can range from positive temperatures (cool storage, around 0°C to 10°C) to deep negative temperatures (freezer storage, which can drop to -40°C or lower). In this environment, high humidity causes many serious problems:

• Freezing, snow on the evaporator: Excess moisture in the air will condense and freeze on the surface of the evaporator (evaporator) of the refrigeration system. This layer of ice reduces heat exchange efficiency, increases the load on the main cooling system and wastes electricity.
• Freezing on the surface of products and packaging: Moisture can also freeze directly on goods and packaging, causing damage to products, making it difficult to load and unload and check.
• Mold and bacteria growth: For cold storage operating at positive temperatures, high humidity can create favorable conditions for mold and bacteria to grow, seriously affecting product quality, especially food.
• Corrosion of warehouse structures and equipment: High humidity accelerates the rusting and corrosion of metal parts of warehouse structures and internal equipment.
• Reduced product quality and value: Storage in an inappropriate humidity environment can lead to a decrease in nutritional value, changes in properties, and damage to goods, reducing economic value. Agricultural products stored in cold storage that retain good quality will have a higher selling price.

Maintaining a stable humidity level is very important to ensure that food and goods are stored safely and that their quality is not affected effect.

Requirements of dehumidifiers for cold storage

Due to the nature of operating at very low temperatures, dehumidifiers for cold storage need to meet special requirements that are difficult for conventional dehumidifiers to meet.

• Effective operation at low temperatures: The machine needs to maintain the ability to remove moisture even when the ambient temperature drops to near 0°C or below zero.
• Prevent freezing: Most importantly, the machine does not freeze on the cooling surface (if any) or the dehumidifying material, which reduces performance or stops working dynamic.
• Deep humidity control: Some cold storage applications (especially freezers or sensitive product storage) require the ability to reduce humidity to very low levels (low absolute humidity).
• Continuous operation: The dehumidification system needs to operate continuously to maintain a stable target humidity.
• Reduce the load on the main cooling system: Good humidity control reduces the amount of ice buildup on the main cooling coil, thereby reducing the load and saving energy on the warehouse's cooling system.

Industrial dehumidification technologies and their suitability for cold storage

There are two main industrial dehumidification technologies that are popular today:

1. Refrigeration Dehumidification:

   • Operating principle: The machine sucks in humid air, cools the air with a cooling coil (evaporator) below the dew point, causing the water vapor to condense into liquid water. The drier air is then blown back into the environment.
   • Suitable for cold storage? NOT SUITABLE. Especially for freezers operating at subzero temperatures. The reason is that at low temperatures in cold storage (near 0°C or below), the surface temperature of the evaporator must be very low to reach the dew point. When this temperature drops below 0°C, the condensed water vapor will freeze (snow, ice) on the evaporator instead of becoming liquid water. This layer of ice clogs the evaporator, seriously reducing efficiency or stopping operation. Condensers work less efficiently at low temperatures due to the low amount of absolute water vapor. In addition, they also release heat into the cold storage, increasing the load on the main refrigeration system. The defrost cycle is complex and energy-consuming.
   • Note: Condensing dehumidifiers can be effective at room temperature or in cold storage operating at relatively high positive temperatures (eg above 5°C to 10°C), but still face serious technical barriers when the temperature drops as low as in conventional cold storage.

2. Rotor dehumidifier (Desiccant Dehumidifier - Absorption):

   • Operating principle: Using a slow-rotating rotor containing a desiccant material (usually Silica Gel or Zeolite) that can absorb water vapor directly from the air. Humid air from the cold storage passes through the rotor, the water vapor is retained. At the same time, a stream of hot air (which is heating) blows through another part of the rotor to "regenerate" the desiccant material, separates the water vapor and discharges it outside. The dehumidification and regeneration process takes place continuously and simultaneously.
   • Suitable for cold storage? VERY SUITABLE AND THE OPTIMAL CHOICE.
     • Outstanding advantages for cold storage: Operates effectively even at very low temperatures without freezing because the principle is based on absorption rather than dew point condensation. Capable of reducing humidity to very low levels (low absolute humidity), meeting the strict requirements of freezers or applications requiring humidity below 40% RH. Continuous operation without interruption by defrost cycles. Effectively reduces the load on the main refrigeration system by removing moisture before it freezes on the evaporator.
     • Disadvantages: Initial investment costs are usually higher than condensing units. Requires energy (usually heat) to regenerate the rotor.
     • See more about Dezenno rotor dehumidifier technology

3. Heat Pump Dehumidifier:

   • Operating principle: Combines the condensing principle with the heat pump cycle to take advantage of the released heat to warm the air after dehumidification. Brings higher energy efficiency than traditional condensers.
   • Suitable for cold storage? USUALLY NOT SUITABLE. Although the energy efficiency is higher, in principle, Heat Pump technology Pumps for dehumidifiers still rely on cooling the air to condense water vapor. Therefore, it still faces the problem of serious freezing of the evaporator at low temperatures such as in cold storage (near 0°C or below zero). This technology is suitable for industrial and commercial spaces at room temperature or cool storage at relatively high positive temperatures, not the optimal solution for cold storage in general.
   • Learn about heat pump technology in DeAir dehumidifiers

Dehumidifier solutions for cold storage from DeAir

DeAir is a reputable manufacturer of industrial dehumidifiers in Vietnam, providing a variety of machine lines with advanced technology. Based on the analysis of the suitability of technologies for cold storage, DeAir provides the following solutions:

1. Dehumidifier with Absorption Rotor Technology (Dezenno Series):

   • This is the ideal and most suitable solution for cold storage, especially freezing storage and applications that require extremely low and precise humidity control.

   • Advantages for cold storage: Using advanced Desiccant technology, operating effectively at very low temperatures, accurately controlling both relative humidity and absolute humidity, maintaining extremely low dew points. Continuous operation is not affected by negative temperatures.
   • Suitable for: Freezing storage, storage of products sensitive to low humidity (pharmaceuticals products, electronic components, seeds, precision mechanics), where humidity needs to be controlled below 40% RH or at very low temperatures.
   • Dezenno Rotor Dehumidifier is a product line manufactured and supplied by DeAir to meet these strict requirements.

2. Heat Pump Condensing Technology Dehumidifier (DeAir.RE, RE-H, RE-INOX, CRE, RE-CL Series):

   • These models use condensing Heat Pump technology, providing strong dehumidification performance and energy savings in many industrial applications. However, as analyzed above, condensing technology (even with Heat Pump to increase energy efficiency) is often NOT SUITABLE for cold storage, especially frozen storage due to the problem of freezing the evaporator at low temperatures.

   • These models are more suitable for industrial spaces, factories, warehouses at room temperature or cool storage with stable positive temperature and do not require extremely low humidity.

   • Variations:

     • DeAir.RE: Basic Heat Pump series, energy saving.
     • DeAir.RE-H: Designed to operate effectively in high temperature environments, can have additional heating function. (Not suitable for low temperature cold storage).
     • DeAir.RE-INOX: Stainless steel shell version, suitable for corrosive, highly hygienic environments (food processing, pharmaceuticals). (Condensing principle condenser is still not suitable for cold storage).
     • DeAir.CRE (Isothermal): Simultaneously controls both temperature and humidity. Although it controls temperature, the condensing principle is still limited to applications in negative temperature cold storage environments. It can be suitable for rooms that require strict control of temperature and humidity at positive temperatures (clean rooms, labs).
     • DeAir.RE-CL (Ceiling mounted): Helps save installation space. (The condensing principle is still not suitable for cold storage).

   • Conclusion on the DeAir.RE Heat Pump line: Although saving energy and efficiency for general industrial applications, based on the operating principle and analysis from the source, the Heat Pump DeAir.RE series not a suitable choice for cold storage environments, especially freezers operating at subzero temperatures.

   • 

3. Olmas dehumidifier:

   • Provided by DeAir, this line of machines is aimed at the civil and small industrial segments. Including models OS-16, OS-25, OS-55 with much smaller dehumidification capacity than industrial machines specialized for cold storage.

   • Suitable for cold storage? NOT SUITABLE for large-scale industrial cold storage or requiring low temperature and extremely low humidity. Olmas machines are suitable for small spaces such as living rooms, bedrooms, small offices or very small storage rooms at room temperature.

Comparison of energy saving levels of industrial dehumidifiers

Choosing the right DeAir dehumidifier for cold storage applications

Based on the analysis of technology and DeAir models:

• For warehouse applications cold storage, especially freezers (-0°C or below) and warehouses that need to maintain very low humidity (below 40% RH) or control extremely low dew points, Dezenno Absorption Rotor Technology dehumidifiers are the optimal choice and are recommended by experts. The ability to operate effectively at low temperatures without freezing and control deep humidity is the outstanding strength of the Dezenno line for cold storage environments.
• The DeAir.RE, RE-H, RE-INOX, CRE, RE-CL condensing Heat Pump lines are NOT suitable for cold storage environments due to their operating principles that can easily cause freezing at low temperatures.

To choose the Dezenno model with the most suitable capacity for cold storage yours, carefully consider the following factors:

• The area and volume of the cold storage space to be treated to determine the required dehumidification capacity.
• The operating temperature of the cold storage (cool or frozen).
• The current humidity level and the post-treatment humidity requirements (desired humidity, especially important if very low humidity is required).
• The volume of goods entering and leaving the warehouse and the level of moisture leakage from the outside.
• Available energy sources to regenerate the rotor (heat resistance or heat from other sources such as boilers, waste heat).
• Is the installation space limited?

DeAir not only provides quality products but also offers comprehensive solutions. Our team of experienced experts is ready to consult and design the optimal dehumidification system for your cold storage, ensuring stable, efficient and cost-saving operation. Dedicated technical service, warranty - periodic maintenance are also commitments from DeAir to ensure long-term efficient operation of the equipment.

Agimexpharm Factory - An Giang uses dezenno rotor dehumidifiers manufactured by deair

Location:

Lot C4-Binh Hoa Industrial Park, Binh Hoa Commune, Chau Thanh District, An Giang Province

Implementation phase:

2022

Product:

DeAir.DE-4500 Rotor Dehumidifier

Content:

Providing DeAir.DE- 4500 rotor dehumidifier, trane system, condenser heat exchanger for Agimexpharm factory - An Giang

Where to buy a dehumidifier for cold storage?

Controlling humidity in cold storage is vital to protecting the quality of goods, maintaining the efficiency of the refrigeration system and minimizing operating costs. In the context of Vietnam's typical hot and humid climate, the solution of dehumidifier for cold storage needs to be suitable for the low temperature conditions and strict humidity control requirements of this environment. Based on operating principle, Dezenno absorption rotor dehumidifier (Desiccant) is the optimal choice for cold storage, especially freezers, thanks to its ability to operate effectively at low temperatures and control humidity deeply.

DeAir is proud to be a manufacturer providing specialized Dezenno rotor dehumidifiers, a reliable solution for industrial cold storage applications in Vietnam. The DeAir.RE Heat Pump series, although effective for other industrial spaces, is not a suitable solution for cold storage environments due to the freezing problem.

For detailed advice on the most suitable cold storage dehumidifier solution for your specific needs and to optimize preservation efficiency, please contact DeAir today.

DeAir - Your trusted partner in industrial humidity control solutions!

Contact information:

• Hotline: 0925977579
• Email: deair@deair.com.vn
• Office & factory: 442/8 National Highway 1A, An Phu Dong Ward, District 12, Ho Chi Minh City
• Contact DeAir: Address, Map, Hotline & Quick Contact Form