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AIR CONDITIONING I HEATING I VENTILATION Prototype machine tested in ETT’s climatic chamber Test results and practical application ETT modified one of their prototypes to perform tests with R-452B. The modification involved changing the tandem compressor for one approved for use with the new refrigerant Solstice® L41y. The aim was to compare the behaviour of R-452B with the current refrigerant, R-410A. The tests were carried out in the climatic chamber. Probes were installed on the machine to measure the temperature and/or pressure at different points (eg compressor discharge/suction, liquid exiting the condenser). Air temperature sensors were also positioned at the coil entry and exit points and next to the machine’s fans. The load for R-452B and R-410A was 20 kg. This provided the following operating conditions: The prototype was tested in air conditioning mode and heating mode at full load and then at partial load. Results of the tests The machine operated normally during all the tests carried out and in all modes (heating or air conditioning). Condensing and evaporating temperatures were almost identical to those recorded for a machine using R-410A refrigerant. Oil return to the compressors occured without any problems. A partial reduction in the oil level was noticeable when starting up both compressors but the oil then returned rapidly to the compressors. Defrosting was fast and trouble free. Results obtained during tests in air conditioning mode, full load The Solution R-452B, the new solution replacing R-410A Solstice® L41y (R-452B) is a new generation refrigerant with a GWP less than 700. It is a mixture of R-1234yf, R-32 and R-125, developed by Honeywell and marketed by Climalife. It is intended as a replacement for R-410A in applications such as chillers but can also be used by heat pump and air conditioning manufacturers. With a similar efficiency and condensing capacity to R-410A, R-452B allows OEMs to quickly transition their R-410A equipment to a lower GWP product while minimising re-design costs and capital expenditure. + More info at: climalife.dehon.com/ r-452b-solstice-l41y 11 | CASE STUDY | November 2019 | Climalife contact #16 Mode Superheating Subcooling Air conditioning 6K 2K Heating 6K 6K Points R-452B R-410A Return air temp. 26.9°C 26.9°C Outdoor air temp. 34.6°C 34.6°C Evaporating temp. 7°C 8°C Condensing temp. 46.8°C 49.1°C Coil outlet air temp. 12.4°C 14.3°C Compressor power 23.1 kW 24.2 kW Cooling capacity 86.3 kW 90.8 kW Co-efficient of performance 3.7 3.8 In full air conditioning mode, the oil level remained constant in the compressors. Performance is similar between R-410A and R-452B.