|220.127.116.11 Heat dissipation using evaporative cooling processes|
|When using evaporative cooling methods, the evaporation heat of the water can be used to cool the air. This is done by spraying a fine aerosol of water into the air where it completely vaporizes if possible. This is often achieved with a fan where the water is sprayed into the air flow produced by the fan, or compressed air is used to create the aerosol. Today, typical applications include: greenhouse and shopping mall cooling systems (e. g. in the USA).
This method of heat dissipation can, in principle, also be applied to refrigerated containers. There are a number of particular benefits:
Obviously, evaporative cooling systems must be accompanied by ventilation of the hold using fresh air, but this can be at a lower level than when using air cooling systems alone. When using a combined system like this, the quantity of fresh air can be reduced from 60 m³/h to 30 m³/h compared with cooling systems using fresh air only. Despite evaporation, the relative humidity drops (!) from 70% at the air inlet to 52.1% at the air outlet.
The quantity of water necessary for evaporation will only be required during normal operation for a few hours a day because the ambient temperature drops at night. Since water is easy to store, the system can be run with a buffer.
This method is particularly interesting if an existing ventilation system is required to extract more heat than is possible with a fresh air cooling system alone.
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