TABLE OF CONTENTS

field case study of industrial plant operating with natural refrigerants
Introduction
In 2001 one of Cofely Refrigeration’s customers decided to convert and increase the
capacity and freezing temperature of a refrigeration plant from 1300kW at -42°C to
2900kW at -51°C. The refrigeration plant in question had been in use with refrigerant
R22 since 1997.
For the installation it was suggested that the plant be re-built by re-using the
installed compressors and using CO 2
to extend the plant capacity with lower process
temperatures. The plant extension had to be executed between October 2004 and June
2005, starting with the conversion of the F250VLD units to N250VLD for use with NH 3
.
About the company
MAYEKAWA is a world-leading supplier of industrial
cooling & freezing systems, refrigeration compressors,
and heat pumps. It actively promotes the “Natural
Five” refrigerants, among them ammonia, for air
conditioning, freezing, and cold storage. Mayekawa/
MYCOM has more than 25,000 MYCOM compressors
running in over 100 countries.
More information at:
www.mayekawa.eu
Contact Information
Eric Delforge
eric.delforge@mayekawa.eu
The new plant was installed in 5 phases over the period staring from weeks 35 of 2004
to week 25 of 2005:
• 1: modification of R22 plant to NH 3
(from week 18 to week 23-2005)
• 2: installation of CO 2
equipment (from week 49-2004 to week 10-2005)
• 3: start-up of C5 & C6 (from week 10-2005 to week 14-2005)
• 4: start up of C7 (wk 16-2005)
• 5: start-up of C8 & C9 (week 18-2005 to week 20-2005)
• Full production from week 25-2005
About the System
The new plant for processing and freezing meat, would operate 24hrs/day 5 days a
week, and would involve:
• Chilling in the process working rooms requiring -12°C;
• Product freezing with plate freezers (4x550kW);
• Quick freezing tunnel (1x600kW);
• Spiral freezer (1x600kW) requiring -51°C;
• Freezing in stores requiring -35°C.
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