Read the full article to find out about issues caused by air / moisture ingress, the effect on doors where infiltration of warm or ambient air is not controlled and the options to mitigate air infiltration.
High speed Doors and PVC Stripdoors are often installed onto Freezer and Cold room entries to assist with the control of temperature loss or gain through the facility. However consideration needs to be given to the prevention of ingress of warm/moist air through these doorways, when the doors are open or in use to reduce ice formation in your coolroom and on the floor.
Unless the warm side of the coolroom or freezer is well controlled for temperature and humidity control, the ingress of warm or humid air will cause ice and condensation once it reaches the chiller or freezer.
Effect on Doors
Installed where infiltration of warm/ambient air is not controlled
Ice or condensation will form on any surface that is not heated or is colder than the moisture droplets in the air. This can cause doors to malfunction, and ice / moisture can become a serious slip hazard on floors, not to mention a hygiene issue for food related sites.
Options to Mitigate Air Infiltration
- Build air-lock chambers or rooms in front of openings to coldrooms or freezers.
- Control the temperature and humidity in the airlock, with additional refrigeration units or air dehumidification.
- Install additional doors between the Airlock and Ambient areas, and control these to ensure freezer or coolroom doors cannot be opened while an outside door is open.
What if I do not have an airlock?
If you do not have an airlock over your chiller or freezer door, and the door opens to ambient, humid air, you will see condensation and ice form on surfaces that are colder than the air coming in. Some options to mitigate these effects can include;
- Install the Chiller/Freezer door on the warm side of the room. This will ensure that the components of the door are closest temperature to the incoming air.
- Ensure the door blade is insulated. Remax Movichill or Thermic curtains offer an insulated barrier between temperature zones, and reduce the ice or condensation formation on the warm side of the door
- Circulate the air in front of the door opening. By circulating the using Air Curtains above the door, or wall mounted fans, the warm/humid air is blown away from the cold surfaces and reduces moisture formation.
- Heated frames. By running low wattage heaters in the door frames, you can prevent ice forming on critical parts of the door.
- Heated Threshold. By heating the threshold of the door opening, you can reduce slip hazards and melt ice that falls from the door or wall above the opening. Consideration needs to be given to floor drainage for the melted ice/condensation.
- Exclude windows in the door. Windows in high speed doors are typically made from PVC which has a low thermal value.
Remax Technical Support team can assist with all your freezer and coolroom door solutions and questions. Call 1800 010 221 to speak to the team today.