Streamline Refrigeration maintains Lidl's large, complex refrigeration system at Littleconnell, ensuring optimal storage conditions for approximately 20,000m² of refrigerated products. The system utilizes advanced ammonia and CO2 technology for efficient cooling across multiple temperature zones.
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Streamline Refrigeration are the appointed maintenance Contractor for the multiple temperature Lidl GmbH Regional Distribution Centre (RDC) at Littleconnell, Newbridge Co. Kildare.
The RDC integrates a medium and low temperature refrigeration plant that utilizes both ammonia and CO2 refrigerants. This unit is responsible for supplying cooling to multiple refrigerated chambers. with Approximately 20,000m² of the total 58,000m² footprint being refrigerated
The refrigeration plant is a centralised ammonia/pumped C02 cascade system, comprising of a single saturated suction pressure on the ammonia side of circa -8°C.4No. HT Sabroe reciprocating ammonia compressors service a ‐8°C/‐5°C spray chiller (located internally within the plantroom) and discharge to the 2No. Evapco PMCQ‐850 evaporative condensers.
Condensed refrigerant flows via four high‐pressure floats back to the spray chiller. Liquid ammonia is circulated via pumps through the spray chiller spray nozzles. Ammonia liquid within the vessel is also used to cool a secondary pumped glycol circuit, via a thermosyphon arrangement and shell & plate heat exchanger (SPHE).
The pumped glycol circuit supplies various chilled areas within the RDC including the Fruit & Veg +14°C Chamber, the switchroom cooler and the roof void AHU. Two PHEs are installed within the common compressor discharge circuit. The first provides heating to the warm glycol circuit and is installed so as to act as a condenser. The second PHE is installed for the future warehouse heating (it is currently not connected on the secondary side) and is installed to operate as both a condenser and a desuperheater.
A ‐5°C C02 surge vessel incorporates 3No. liquid pumps that pump C02 on an overfeed basis to a series of valve stations located within the roof void above the refrigerated chambers. The valve stations (one per evaporator) supply C02 refrigerant to evaporators servicing the medium temperature (MT) coldrooms, returning as a ‘wet return’ to the vessel. The ‐5°C C02 surge vessel also provides C02 liquid to the ‐36°C C02 surge vessel.
The ‐36°C C02 surge vessel is serviced by 3No. LT Sabroe HPO26V compressors which discharge into the spray chiller heat exchanger (cascade condenser). The ‐36°C C02 surge vessel incorporates 2No. liquid pumps that pump low temperature (LT) C02 on an overfeed basis to the LT freezer chamber.
Abbey Road, Thurles, Tipperary, E41 X3F4, Ireland
