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Case study
Following the construction of a cold store extension in the midlands a persistent problem remained. The extension was accessed by a short tunnel connecting the two stores. On either side of the tunnel were ambient work areas both of which accessed the tunnel through large fork truck doors.

The air in the tunnel was at -27’C and whenever an access door opened considerable precipitation occurred. The ceiling of the tunnel suffered from a build up of snow that was being cleared at least 3 times a week manually. The snow fell on the floor of the tunnel which caused a slipping hazard to both pedestrians and MHE. The doors themselves suffered from icing and damage, the floors of both areas near the tunnel entrance became wet and icy at certain times and heavy fogging occurred which then settled on other surfaces in each area.

The construction company got in touch with ATP following a recommendation by the client for whom we had worked with before. We recommend a number of passive measures that could be used to limit the air flow when the doors were in use and an active dehumidification system that delivered a barrier of bone dry air between the tunnel and the ancillary areas. When the doors were not in use the system reduced the levels of humidity in each area preventing condensation and fog when the doors were in use the system ensured any air entering the store was a mix of dehumidified air in the area and air off the unit in its driest state. The design of the system made full use of the density and properties of air at the two conditions and maximised this to create a circulation barrier that restricted ambient air movement considerably.
Instead of cleaning the ceiling every 3 days the ceiling is now cleaned every 3 weeks often longer, snow and ice are reduced with fog and condensation virtually eliminated

An illustration of this installation is shown in the video presentation on the site.

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