With energy efficiency at the forefront of the design, 6no Advansor CO₂ refrigeration packs were selected. Each LT and HT system incorporated a minimum of one variable speed compressor to achieve optimum load balance at all conditions. Electrical control and sub-distribution panels are mounted and fully wired on each pack. Maximum design pressure being 52 / 30 / 60 120 bar.
- 5K TD between room temperature & evaporating temperature’
- 2K TD allowed between gas cooler outlet temperature & maximum ambient temperature = Trans-critical operation 9K TD between condensing temperature & ambient temperature with 5K subcooling for subcritical.
- Parallel compressor is used for better performance.
- Air cooled LT de-superheater is arranged for DT 1, 2 & 3. Heat reclaim plate heat exchanger for freezer underfloor heating connected to DT 4, 5 & 6 LT discharge line as LT de-superheater for better performance.
- Pipework is designed to allow a maximum 0.5K pressure drop in all suction lines.
All pipes run high level inside the coldrooms to minimise the non-useful superheat in all suction lines. - Four dual PRV sets are installed on each pack (HT suction, LT suction, liquid receiver & HT discharge).
- Minimum 12.6°C condensing temperature restricted by compressor envelope.
- Discharge pressure 120 bar.
- 3 x 170 litre receivers for DT1, 2 & 3, and 2 x 170 litre receivers for DT4, 5 & 6