Dehumidification drying of red oak. part 2. cause of cooling coils corrosion in heat pumps

Dehumidification kiln-drying of red oak lumber resulted in the corrosion of cooling coils in a laboratory kiln. Cooling coils in industrial kilns protected by anti-corrosion finishes did not exhibit any signs of corrosion. Laboratory kiln-drying condensates were characterized by a bluish tinge and produced blue crystals upon evaporation. X-ray diffraction analysis of the kiln condensate blue crystals identified them as copper acetate monohydrate. This identification was further supported by Fourier transform infrared and UV-visible spectra of condensate crystals.

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