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ABSTRAcrThe paper presents a theoretical evaluation of the performance effects resulting from the installation of a liquid line! suction line heat exchanger (llsl·hx). It examines cycle the parameters and refrigerant thermodynamic properties that determine whether the installation results in improvement of COP and volumetric capacity. The study showed that the benefit of application of the Jlsl-hx depends on a combination of operating conditions and fluid properties • heat capacity, latent heat, and coefficient of thermal CJtpansion • with heat capacity being the most influential property. Fluids that perform well in the basic cycle are marginally affected by the llsl-hx, and the impact on the Coefficient of Perfo~mance and volumetric capacity may be either positive or negative. Fluids performing poorly in the basic cycle benefit from the llsl·hx installation through increase of the Coefficient of Performance and volumetric capacity.

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