The use of ammonia/CO2 Cascade systems on Fishing Vessels
In fishing we know that rapid freezing of fish is extremely important for the product quality, and at the same time is the available space for machinery on board modern trawlers limited. In order get the quick freezing and high production capacity, I have in recent projects learned how this is possible with the Ammonia/CO2 Cascade freezing systems.
We found that by lowering the evaporating temperature (TE) from –40°C to –50°C, the freezing time was reduced 20%, and the increase the vessel production capacity accordingly. Even the energy efficiency still looks great as we also found: At –50°C TE is the COP of the Cascade system comparable to NH3 direct system at –40°C TE.
Conclusion: The use of ammonia/CO2 Cascade systems leads to: Faster freezing, better product quality & higher production. Still it is environmental friendly – both globally and locally.
So, CO2 is not just the future – it’s also the present!
Maritime Refrigeration group discussion
The power of positive energy efficiency ?Thermo.Katwijk, using R744 (CO2) Refrigerant and heat-pump technology. F-gas1 certificated.
8 年Indeed Claus k Petersen, but keep safety in mind, no refrigerant in the Fish holds and closed work decks anymore , never never again! This was already dangerous with R22 direct evaporating systems, and wil be even more with CO2. On board you can call 112 during calamity's, but it will take a while before ambulance/medical rescue appear. (If the weather make's it possible, anyway) So the co2 holding parts all above main deck level, and well ventilated from top to bottom, in stead of the other way around, and make it also possible to let the co2 run in to open air in case of calamity's, cause mechanical ventilation may not work.Co2 makes is possible to use the heat for DMHW on board, and heating, and stationair heating of the engine cooling systems. While the seawater temperatures world wide, make subcritical working possible..
Business Development Manager
8 年Well Peter that sounds like JCI still are running old school .. At B-cool we are working on a Transkritical CO2 solution.. = No R717 onboard.. Safe and cheep..
Engineering and Consulting, , Refrigeration & Consulting Eng.,S.A.
8 年Also smallest size
Technical leader and Senior Industrial Refrigeration at Johnson Controls Inc (LatinAmerica).
8 年Good commentary