Briefs: Grenco Marine

Grenco Marine has developed the first ammonia/carbon dioxide cascade systems to be used on board fishing vessels. Experience with the Dirk-Dirk (a trawler with a capacity of 235 tons of fish/day) led to the development of a new defrosting process: hot gas from the compressors is used to defrost the plate freezers. The total-screw compressor systems specially developed for CO2 have been purchased by W. van der Zwan & Zn. B.V. for two of their pelagic freezing trawlers. Grenco says that energy savings of 22% (with respect to HFC systems) are achieved, freezing time is reduced 25%, and less freezing equipment is needed.