Abstract
When simulating refrigeration systems or equipment, knowledge of refrigerant thermodynamic properties is required. While some of the refrigerants are made of pure fluids, some of these refrigerants are made by mixing of two or more pure refrigerants with the predetermined percentages. Properties of refrigerants are a major part of international trade, therefore, it is a subject of interest of international standards. In this study a computer model was developed based on Helmholtz equation of state and cubic spline curve fitting models developed by using saturation thermophysical properties of the refrigerants and refrigerant mixtures. Java programming language was used to model equation of state. As an example the equations for R1234yf and R410A were presented in this paper. With the new model, thermodynamic properties of R1234yf and R410A were compared with REFPROP 9.0. It shows that the total mean deviations of the new model are less than 0.5%.
Highlights
Refrigeration systems become more important for people’s daily lives in recent decades, and more refrigeration products are designed every year, which requires the design of refrigeration products to be more efficient
Two mathematical approaches were used for calculating pure refrigerants thermodynamic properties
R1234yf and R410A were selected as a representative refrigerant to illustrate how to use the new developed program for the determination of thermal properties in this study
Summary
Refrigeration systems become more important for people’s daily lives in recent decades, and more refrigeration products are designed every year, which requires the design of refrigeration products to be more efficient. One of the effective ways to improve the design efficiency for refrigeration products is to use the computer simulations. Since it is not possible to measure every refrigerant property of interest at every combination of temperature and pressure, refrigerant properties are usually determined with some sort of mathematical model. Even though there are number of equations of state models that have the abilities mentioned, these formulations present the disadvantage of their low computational speed and that most of the thermodynamic properties equations are implicit and require more iterations. The traditional methods based on equation of state cannot meet such requirement because of unavoidable iterations in calculation. The engineering calculation and simulation of refrigeration systems require the availability of simple and efficient mathematical models for the determination of thermodynamic properties of refrigerants
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