Asda Distribution Centre / UK
Planning / Implementation / Main components: | Star Refrigeration Ltd |
Refrigerant: | Ammonia (NH3) |
System start-up: | 2007 |
Beginning in 2002, the British supermarket chain Asda has had Star Refrigeration replace all refrigeration units which use the hydrochlorofluorocarbon (HCFC) R22 at its distribution centres, as part of a long-term modernisation programme. Star Refrigeration implemented an ammonia and carbon dioxide cascade facility for the refrigerated warehouse at one of its major distribution centres in Lutterworth, UK. |
|
Demands: |
A system to provide efficient refrigeration for the 270,000m³ premises. Areas requiring refrigeration were: a frozen food cold store at -25°C and several chill rooms at temperatures between 1°C and 13°C. |
Solution: | Star Refrigeration designed a central refrigeration system which supplies liquid carbon dioxide at -31°C to six air coolers in the cold store. It also supplies carbon dioxide as a volatile secondary refrigerant at -5°C to 20 air coolers in three chill rooms. The cascade facility’s low temperature circuit yields a refrigerating capacity of 820 kW, while the high temperature circuit produces 2,700 kW. |
Technical data:
Type of facility | cascade facility |
Refrigerant | NH3 |
Refrigerant volume | approx. 2,000 kg NH3 |
Refrigerant | CO2 |
Refrigerant volume | approx. 8,000 kg CO2 |
Refrigerating capacity | 3.5 MW |
Refrigerating temperature |
CO2 low-temperature circuit: -31 ºC CO2 high-temperature circuit: -5 ºC |
Main components |
2 CO2 and 4 NH3 screw compressors made by Grasso, 26 air coolers, 1 CO2 surge drum and pump set, 2 plate and shell heat exchangers 2 NH3 evaporative condensers, 1 NH3 high pressure receiver |
Special features / Comments | Computerised control system, ammonia and carbon dioxide detectors for early leak detection |
Contact:
Star Refrigeration Ltd
David Blackhurst
Thornliebank Industrial Estate
Glasgow G46 8JW
United Kingdom
Phone: +44 (0)141 638 7916
Fax: +44 (0)141 638 8111
E-mail: dblackhurst@star-ref.co.uk