R-290 (propane) has been chosen as one of the most potential next generation working
fluids of RACs because of its favourable environmental and thermo-physical properties.
However, its use is hindered by its flammability and resulting concerns on safety. In
addition, the charge mass is limited strictly by the standards which would impact RAC's
heating performance. In this paper, refrigerant mass distributions within a R290 split type
air conditioner were experimentally investigated at both static and dynamic state, in which
the liquid nitrogen method (LNM) was used to determine the refrigerant mass inside the
components of the circuit. The distribution of refrigerant that changes with temperatures
and compressor speed were also measured and discussed. The results can assist with
improving the design of the products (performance improvement, safety measures, etc.)
and providing data for further theoretical study and simulation analyses
R-290 (propane) has been chosen as one of the most potential next generation workingfluids of RACs because of its favourable environmental and thermo-physical properties.However, its use is hindered by its flammability and resulting concerns on safety. Inaddition, the charge mass is limited strictly by the standards which would impact RAC'sheating performance. In this paper, refrigerant mass distributions within a R290 split typeair conditioner were experimentally investigated at both static and dynamic state, in whichthe liquid nitrogen method (LNM) was used to determine the refrigerant mass inside thecomponents of the circuit. The distribution of refrigerant that changes with temperaturesand compressor speed were also measured and discussed. The results can assist withimproving the design of the products (performance improvement, safety measures, etc.)and providing data for further theoretical study and simulation analyses
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