![]() Based on careful investigation of the geometrical effect of heat exchangers on the LM cycle, a novel design of the heat exchanger is proposed, and its overall performance in the LM cycle is evaluated. Multiple refrigerant flow paths decrease the air outlet temperature further and prove to be more effective than the single flow path design. Counterflow configuration is found to be superior to the parallel configuration, particularly in the LM cycle, owing to the gliding temperature difference of zeotropic mixtures. ![]() Various design changes of the heat exchanger are adopted to enhance the energy efficiency of the LM cycle. The R600/R290 mixture demonstrates the best performance characteristics. The predicted results are validated against experimental gliding temperature with varying mass fractions of different zeotropic mixture combinations. The computational simulation includes a heat exchanger model developed for predicting the air outlet temperature accurately. This study evaluates the performance enhancement of the Lorenz–Meutzner (LM) cycle with zeotropic mixtures of multiple refrigerants using a numerical simulation model. REFPROP disseminates international standards in both the natural gas and refrigeration industries, as well as standards for water/steam. ![]() Properties can also be accessed through third-party apps or user-written code via the core property subroutines compiled into a shared library. A graphical user interface generates tables and provides extensive plotting capabilities. We document the models for the 147 fluids included in the current version. The equations of state for thermodynamic properties are primarily of the Helmholtz energy form a variety of models are implemented for the transport properties. REFPROP implements the most accurate models available for selected pure fluids and their mixtures that are valid over the entire fluid range including gas, liquid, and supercritical states, with the goal of uncertainties approaching the level of the underlying experimental data. ![]() The NIST REFPROP software program is a powerful tool for calculating thermophysical properties of industrially important fluids, and this manuscript describes the models implemented in, and features of, this software. ![]()
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