MARCO LEGAL

This research is limited to the use of commercial LPG and R-290 as drop in 1.0 hp residential air conditioner initially designed to use R-22. The air conditioner uses the vapour compression refrigeration cycle. The study of the azeotrope and zeotropic properties and the temperature glide of the LPG blends will not be included in this research.

The testing chamber used in this study consist of the “air enthalpy method” type of installation in determining the energy efficiency ratio (EER) of split types air conditioner using the MS ISO 5151:2012 “Non-ducted air conditioner and heat pumps- testing and rating performance (1st _{revision)”. Since the split air conditioner}

used in this test consist of a unit without “inverter controller” that controls partial loads of the compressor, it will be tested at full load conditions only. This is in accordance with the requirements of MS ISO 5151.

The simulation of leaking LPG in an enclosed space is limited to a low Mach “Large Eddy Simulation” (LES) turbulence model. 729,000 purely hexahedral cells will be used for meshes and time step size is limited to 0.1s. Run time is limited to 240 seconds which is corresponding to 4 minutes of total leak time.

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