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REAL Alternatives Module 2 Design Differences for Alternative Refrigerants | 25 Case Study ‐ Small simple system design for hydrocarbon supermarket systems in the UK In the UK small simple hydrocarbon refrigerant systems have been used instead of large central plant systems in over 100 supermarkets. The systems typically comprise integral cabinets with water cooled condensers and monoblock cold room systems also with water cooled condensers. Glycol chillers located outside cool the glycol required at the cabinets and monoblocks (see figure below). Air cooled split air conditioning units are also used. The system is designed to enable to the use of R1270. They are all low charge systems and, except for the split AC systems, are factory tested and charged. Leakage rates are typically 1% of the total charge per year, compared to up to 100% for central plant systems. So increases in energy consumption due to leakage do not occur. This type of simple system can be more resilient – for example being less prone to having set points changed during service which significantly effects energy consumption. The application of HC refrigerant encouraged the application of smaller systems with a limited charge, resulting in a major reduction in leakage. simple schematic of water cooled cabinets and chillerPDF Image | Alternative Refrigerants
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