CASE STUDIES
Ammonia system reduces energy use and carbon at Pilgrim UK
Demeva Refrigeration has installed a high effi ciency, Bitzer ammonia refrigeration system at Pilgrim UK’s meat processing facility at Bromborough, Wirral, dramatically reducing the company’s energy costs and carbon emissions.
E
nergy costs for the previous cooling system were £146,000 a year, compared with an estimated £61,000 for the new Bitzer ACP pack, saving over £80,000 a year in running costs – a reduction of nearly 60% – and delivering substantial savings in carbon emissions. The project is part of a site-wide energy effi ciency
programme designed to reduce power consumption and carbon emissions. Demeva Refrigeration, based in Formby, Merseyside,
specifi ed a 707kW Bitzer Ammonia Compressor Pack (ACP), powered by high performance screw compressors, to replace an end-of-life ammonia system by another manufacturer that had been in service for 20 years. The existing ammonia charge was retained for use in
the new system, further supporting the economic case for the upgrade. The new Bitzer ACP system provides primary cooling at an evaporating temperature of -9°C for the site’s secondary glycol circuit, serving cold stores at 2°C and air handling units at 8°C within the processing facility. Timing on the project was critical due to the need to
ensure continuity of cooling at the production facility. This was assisted by being able to run the system’s second compressor during the switchover. A logistical challenge was removing the old system and locating the new pack in position in the plant room. This required relatively straightforward modifi cations to pipework to connect the ACP pack to the central glycol system, followed by electrical connection. “It was the fi rst Bitzer ACP pack we have installed,” said Dean Rawling, Demeva director. “Having assessed the technology currently available on the market, we believe Bitzer ‘s ACP system is the most effi cient ammonia refrigeration solution available. Plus, importantly, it has the added safety benefi t of being built and tested in pristine factory conditions by Bitzer.” In the run-up to the replacement, the project leads from Demeva and Pilgrim UK visited Bitzer’s manufacturing and
30 February 2024 •
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