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The climate in the cold storage room has a significant effect on the
quality of the products stored there. This climate depends on different
influences, such as the surface temperature of the evaporators, cold
storage room temperature, degree of evaporator icing, quantity and type
of refrigerated goods etc.
The icing of the evaporators depends on the evaporator and room
temperatures and the quantitiy of humidity introduced by the refrigerated
goods. Icing of the evaporators significantly reduces the refrigeration
capacity and must therefore be prevented as much as possible by
periodic defrosting, i.e. heating the evaporator surfaces. In addition to the
periodic defrosting at set times, there is defrosting performed as required
by measuring the actual ice coating. The evaporator surface can be
heated from the outside by electric heating or from the inside by hot gas
directly from the refrigerant compressor.
first defrosting is used when the temp. go below zero
>>in refrigerators the usual way to defrost is electrical heater only (small capacity heater)
>>in cold stores you can defrost to protect the tile by
1-electrical heaters
2-hot water boiler system
3-heating oil system
second heating : used above zero for human comfort air conditioning in AC
usually by
1-electric heater.
2-reversed Freon cycle.
3-boiler system with FAN COIL UNITS.
. Hot refrigerant vapor system.
. Nonfreezing solution system.
. Water system.
. Electric heater system.
. Reverse cycle defrost system.
. Warm air system
