Case studies

Prosper de Mulder


Planning / Implementation / Main components

Star Refrigeration Ltd.

Refrigerant

Carbon dioxide (CO2), secondary refrigerant Ammonia (NH3)

System start-up

2003

Prosper de Mulder, the UK's largest pet food processor, had a requirement for an efficient plate freezing system to replace the old R-22 system for their pet food production facility in Doncaster, England.

Demands

Replacement of the old refrigeration plant which used R-22 with a non ozone depleting refrigerant which would not be subject to impending F-gas regulations.

Solution

Installation of an environmentally friendly and highly efficient plate freezer system using carbon dioxide as the refrigerant with ammonia condensers.

Technical data:

 

Type of facility

Vertical plate freezer system

Refrigerant

CO2

Secondary Refrigerant

NH3

No. of refrigeration compressors

2

Refrigerant temperature

CO2 -50 ºC, NH3 -40 ºC

Refrigerating capacity

1,000 kW

Main components

Screw compressors, surge drum/pump set, 16 plate freezers

Special features / Comments

The main environmental benefit is the low energy consump-tion of this system. The combination of CO2 with pressurized liquid defrost for a plate freezing system is a world first. Freezing times are 75 % of the traditional system and the system is running more efficiently at far lower temperatures without causing excessive power consumption.

Contact:

Star Refrigeration Ltd.
David Blackhurst
Thornliebank Industrial Estate
Glasgow G46 8JW, UK
Phone: +44 (0)141 638 7916
Fax: +44 (0)141 638 8111
E-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.