TABLE OF CONTENTS
TABLE OF CONTENTS
TABLE OF CONTENTS
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Quick freezing salmons at Nordlaks AS, Stokmarknes, Norway<br />
Introduction<br />
In recent years the use of CO 2<br />
as a refrigerant especially for freezing of food has<br />
increased all over the world. The benefit of lowering the temperature is faster freezing<br />
times. A 10 K lower freezing temperature gives 25% quicker freezing time, enabling<br />
a higher throughput on the same footprint using the same freezers. This is widely<br />
appreciated especially in the fishing industry and even more so onboard ships where<br />
space is critical. In this specific project the system is land based and the fish is produced<br />
in cages at sea. The lower freezing temperatures here give a quality product, which is<br />
appreciated by the end consumers.<br />
About the System<br />
The system installed has to fulfil following requirements:<br />
About the company<br />
Since its start in 1885, Johnson Controls has grown<br />
into a global leader in building efficiency, automotive<br />
experience, and power solutions. JCI is one of the<br />
leading companies of refrigeration and chiller solutions<br />
based on natural refrigerants. It offers products and<br />
services that optimize energy use and improve comfort<br />
and security.<br />
More information at:<br />
www.johnsoncontrols.com<br />
Contact Information<br />
Alexander Cohr Pachai<br />
Alexander.C.Pachai@jci.com<br />
(+45) 8736 7159<br />
• Freezing of whole salmon in IQF 1 (spiral freezer). Frozen product 4-6 metric tons<br />
per hour. Capacity required 600 kW at Te=-47˚C<br />
• Freezing of salmon filets in portions in IQF 2 (spiral freezer). Frozen product 1,5-2<br />
metric tons per hour. Capacity required 200 kW at Te=-47˚C<br />
• Cold-store kept at -28˚C. Room volume 7800 m 3 . 40 metric tons food stuff in and<br />
out per day. Capacity required 100 kW<br />
• 3 refrigerated rooms at +2˚C and a total cooling requirement of 65 kW<br />
• Heating of freezing area. Heating load calculated to 180 kW<br />
• Floor heating of marshalling area and cold-store<br />
During the installation a desire for hot tap water for washing came up<br />
The provided solution is a cascade CO 2<br />
/NH 3<br />
system with a total cooling capacity of 800<br />
kW at -47˚C. The +2˚C rooms are cooled by a separate glycol heat exchanger in the<br />
ammonia system. Defrost is performed by using the fans.<br />
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