Case studies

Guinness Brewery / Ireland

Planning / Implementation / Main components

Star Refrigeration Ltd.


Ammonia (NH3)

System start-up


The Guinness Brewery in Dublin planned to increase the production volume of its world-famous Guinness Stout beer to twelve million barrels per year. The necessary extension of its refrigeration system was handled by Star Refrigeration.


The objective was to expand the existing ammonia-glycol refrigeration system within six months, minimising any impact on production.


Star Refrigeration extended the 5 megawatts system up to 8.9 megawatts, which complements the existing facilities perfectly. A new suction side collector and two plate heat exchangers work with gravity feed alongside the four existing shell-and-tube evaporators. The refrigeration specialists installed six additional variable speed drive glycol pumps and increased the condenser capacity. The modernized system now has a refrigeration capacity of 8.9 megawatts at an evaporating temperature of -4.5 degrees Celsius, without noticeably increasing the ammonia refrigerant charge in the system.

Technical data:


Type of facility

Central refrigeration system



Refrigerant volume

8,000 kg



Refrigerant capacity

8.9 MW

Refrigerant temperature

Evaporating temperature: -4.5 C°

Main components

Two new compressor units with one screw compressor each, four existing screw compressor packs, suction side collector, plate heat exchangers, condenser, three other variable speed drive glycol pumps

Special features / Comments

A computer-based monitoring system optimises all processes and handles the temperature controls. Its efficiency and environmental friendliness earned the project the RAC Cooling Industry Award 2005 for “Installation of the Year.”



Star Refrigeration Ltd.
David Blackhurst
Thornliebank Industrial Estate
Glasgow G46 8JW
United Kingdom

Tel.: +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.