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HallScrew compressors reduce cold store energy bills

A UK-wide storage and distribution company has cut its cold store energy bills by more than 20 per cent and reduced its carbon footprint considerably after introducing a new refrigeration system designed and built by J & E Hall. Three J & E Hall compressor packs are at the heart of the ammonia-based plant at the Norish distribution centre in Brierley Hill, Dudley, West Midlands. Norish is a multi-temperature warehousing and logistics business operating from eight locations across the country.

The previous refrigeration plant in the cold store needed updating. The old system had been using R22 refrigerant and was not equipped to deal with the demands of the F-Gas regulations. Norish was looking for a new system, which would be more energy efficient and have the right green credentials to match. J & E Hall were invited to put together a plan for the new system and suggested an ammonia-based system supported by three HallScrew compressors.

Will Harrison, design and contracts manager, explains: “Norish had expressed a preference to operate the system to run at a positive pressure. This fitted with our philosophies of offering an efficient system running with low temperature differences. We also wanted to utilise variable speed drives where possible to take advantage of the part load efficiencies they offer. The new ammonia plant operates with frequency invertors on both the condensers and compressors; this provides part load efficiency gains and delivers accurate system control.”

Norish chief engineer Stuart Lloyd said that an ammonia-based plant was chosen because it provided the best long-term solution: “Ammonia will be around for the foreseeable future. It helps reduce our carbon footprint. Our job spec was for efficiency, reliability and economy of use. We had an R22 plant running in the same area we were building a new ammonia plant. We had to maintain temperature for the cold store while the new plant was being built. There were lots of cross-over points. Halls handled those challenges beautifully.”