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The reason behind ice build-up in freezers and cold stores. And what you can do about it.

5 min read
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Regulating humidity can save you a whole host of problems

The average temperature for cold food and beverage storage is usually between +3 and +5°C, dropping to around -25°C in freezer rooms. While humidity can cause problems in any facility handling food produce, especially in cold conditions, excess moisture in the atmosphere means unwanted condensation or ice build-up.

Relative humidity (RH) tells us how much water vapor is in the air, compared to how much it could hold at that temperature. Because warm air can hold more moisture than cold air, an environment’s relative humidity percentage is not a direct measure of the amount of water vapour present. For example, there will be more moisture in the air at 50% RH when the temperature is 25°C than there would be at 10°C.

Sudden changes in temperature will alter RH levels dramatically. When the air rapidly cools, RH levels can reach 100%, or dew point, causing the water vapour to condense. In sub-zero conditions, these water droplets freeze instantly.

Moisture-laden air can enter a busy freezer room or cold storage facility in a number of ways, including:

  • Building access
    Humid air will find its way through building entrances that are left open too long, or automatic doors that close too slowly.

  • Sealing
    Windows and other openings in a facility can let in humid air from outside or from other parts of the building.

  • Produce
    Food products stored in a facility can often release moisture into the atmosphere.

  • Staff
    People and vehicles in operation inside the facility can both increase humidity levels.


Why is ice build-up a problem?

In short, ice build-up will cost you time and money. Some of the most common symptoms are:

  • Damaged packaging
    When ice begins to thaw, it will disintegrate cardboard packaging and cause labels to become illegible.

  • Low quality or wasted produce
    When ice crystals form on food, flavours and aromas will be compromised and it can be left completely tasteless.

  • Productivity
    De-icing a storage facility is a time consuming job. Having to do this regularly will reduce productivity due to the freezer being taken out of operation.

  • Slip hazards
    As it spreads throughout a facility, ice and frost build-up will turn your storage room floor into a dangerously slippery surface for staff lifting heavy goods or operating forklifts. A build up of ice can also form on surfaces and ceilings which cause an additional hazard of breaking off and falling. You can also get slippery surfaces and low level fog forming outside of the freezer room door.

  • Equipment failure
    Vents and evaporators are especially susceptible to malfunction and lower efficiency caused by ice build-up in mechanisms.


What’s the best solution for your facility?

The best solution is to minimise unwanted moisture entering the freezer and cold store. This can be achieved using desiccant dehumidification around entrance doors and any other areas of moisture infiltration.

To physically remove unwanted moisture from the atmosphere, a desiccant dehumidifier can be used. The desiccant rotor within the unit contains a network structure impregnated with silica gel which absorbs the moisture before the air is returned back into the space.

Dantherm Group can offer dehumidifiers suitable for installation, inside the freezer, outside the freezer or for dehumidifying a freezer air lock. As shown in the diagrams below:


Dehumidification solutions from Calorex can be optimised for your setting and installed with minimal disruption to your process. To find out more about protecting your product and preventing the cost that comes with constant ice build-up, don’t hesitate to get in touch with our team.

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