The optimum cool room

The optimum elements for the design and construction of a cool room based on evaporative cooling technology have been researched by South Africa’s state fruit research institute ARC Infruitec-Nietvoorbij.
Cool rooms based on evaporative cooling technology are suitable for limited-period storage of, for instance, most fruit and vegetables. Fo The optimum elements for the design and construction of a cool room based on evaporative cooling technology have been researched by South Africa’s state fruit research institute ARC Infruitec-Nietvoorbij.
Cool rooms based on evaporative cooling technology are suitable for limited-period storage of, for instance, most fruit and vegetables. For long periods of preservation of deciduous fruit, temperatures of -0.5™  °C are required, which cannot be achieved by evaporative cooling, but the optimum storage temperature for most sub-tropical fruit is much higher at 10-15™  °C.
With the most optimum evaporative cool rooms, depending on the wet bulb temperature, the outside temperature in them can be reduced by about 15™  °C.According to ARC Infruitec-Nietvoorbij’s research, optimum cooling in a cool room (as pictured) is achieved with:

  • A double wall constructions, with gaps between the bricks.
  • The space between the two walls is filled with friable, porous materials – for instance, coke or broken brick which does not disintegrate.
    The friable, porous material is kept damp via water fed from a receptacle mounted on the roof.
  • Air circulation is important. It is achieved through the gaps in the wall, but is enhanced through installation of a whirlybird mechanism on the roof.
    In areas where there is a high diurnal temperature range it may be that the temperature is lower outside at night. If so, the door of the cold room can be opened, with suitable protection installed from rodents and other animals entering. As this kind of cooling is based on humidity, it is not suitable for storing, for instance, grain. For grain storage, the FAO website, www.fao.org should be viewed.
    INFRUITEC: chris@infruitecagric.za Tel +27 21 8093100 Fax +27 21 8093400
    TO E-MAIL THE SUPPLIER, CLICK BELOW