The CYCLE_D-HX software package simulates the performance of single-component refrigerants and refrigerant blends in subcritical vapor-compression refrigeration cycles. The basic system simulated by CYCLE_D-HX consists of a compressor, discharge line, condenser, expansion device, evaporator, compressor suction line, and an optional liquid-line/suction-line heat exchanger. The other cycles may contain a second compressor, one or two economizers, or an intercooler. In contrast to simplified vapor compression cycle model, which require refrigerant saturation temperatures in the evaporator and condenser as input, CYCLE_D-HX establishes saturation temperatures in the heat exchangers using the temperatures profiles of heat source and heat sink and the mean effective temperature differences (?Thx) in the evaporator and condenser, respectively, which are specified as input to the program. This representation of heat exchangers facilitates the inclusion of both thermodynamic and transport properties in cycle simulations and makes CYCLE_D-HX suitable for comparative evaluations of different refrigerants, particularly when applied in systems relying on forced-convection heat transfer of refrigerant in the heat exchangers. This software package was developed by the National Institute of Standards and Technology (NIST), is not subject to copyright protection, and is in the public domain.

REFLEAK estimates composition changes of zeotropic mixtures in leak and recharge processes. The leak/recharge simulation program consists of three parts: 1) the pre-processing section for inputting required data, 2) the computation section which simulates leak/recharge processes and, 3) the post-processing section to display calculated results and to print or store data and graphs. Version 6.0 System Requirements: Personal computer capable of running Microsoft Windows 7, 8, 10 with Microsoft .NET Framework version 4.7.2 or later and Microsoft Visual C++ Runtime Library (for x86) version 14 or later; A hard disk with 17 megabytes of available space. The installation process will require additional 104 MB of space for Microsoft .NET Framework version 4.7.2 and Microsoft Visual C++ Runtime Library (for x86) version 14 if they are not installed already; The screen resolution should be set to 1024 x 768 or higher to view images in their entirety.