Warm glycol defrosting has been around for many years , but have proved to be extremely effective in removing frost and ice from freezer room evaporators , in the shortest time period while introducing the minimum amount of heat into the freezer room , and providing a very dry environment inside the freezer room.
Most modern refrigeration systems use electric element heater to remove moisture from the freezer room evaporators. The electric heaters are basically electric jug elements straightened out in inserted into the evaporator tubes. These heaters get extremely hot towards the end of the defrost which causes problems, including , heater element failure, damaged evaporator tubes which can leak refrigerant , failed electrical cables and joints , failed contactors , overloads and controls and safety components.
The electric element also discharge a lot of heat into the freezer room that has to be removed when the refrigeration plant restarts. This heat also carries moisture from the evaporator into the freezer room where it condenses into water and then re freezes on the ceiling walls and product in storage.
Warm glycol defrosting eliminates the electrical system and replaces it with glycol which is heated by waste heat from the refrigeration plant. When a defrost is required a pump delivers warm glycol from a storage tank to the evaporators , and the gentle heat melts the ice and allows it to go down the drain , without getting it hot enough to escape back into the freezer room.
This makes the freezer very dry and free of frost and ice, and reduces the after defrost cooling load significantly.
A dry freezer free of frost and ice is a much safer working environment and better for the product in storage.
Don’t ever need to chip away ice again !
