How does HTRI mix refrigerants such as PEFPROP (R410A)?

HTRI (Heat Transfer Research, Inc.) is a set of software for the design, evaluation, and education of heat exchangers, widely used in the chemical, petroleum, and energy industries. The HTRI Xchanger Suite software can be integrated with other software such as PEFPROP (Property Estimation for Fluid Properties) to accurately simulate the performance of refrigerants. R410A is a commonly used mixed refrigerant, consisting of a mixture of R-32 and R-125. During the design process, accurate physical property data is very important. If you encounter accuracy issues in VMG, you may need to check whether there are updated property data or models available to improve your simulation results. As for PEFPROP, it typically provides a comprehensive database of physical properties for accurate calculation of the properties of various fluids, including pure components and mixtures. The following are the general steps for simulating mixed refrigerants using PEFPROP when direct data is not available: 1. Check whether the data for the mixed refrigerant you need already exists in the PEFPROP database. If there is existing data, use it directly for simulation. 2. If there is no available data on mixed refrigerants, you need to create the mixture yourself based on the physical property data of the individual components. This usually involves the following steps: - Determining the component ratios of the mixture. - Query the pure physical property data for each component in the database. - The theory of mixtures (such as the ideal solution assumption or more complex models like Wilson, NRTL, or UNIFAC) is used to predict the physical properties of mixtures. 3. Regarding R-513A that you mentioned, if the component R-1234yf in this refrigerant is not available in PEFPROP’s database, you may need to find the property data for pure R-1234yf from experimental data or literature, and enter it into PEFPROP. 4. After defining the components of the mixture and various interaction parameters, PEFPROP is used to calculate the physical properties of the mixture, including saturation temperature and pressure. 5. Once you have obtained these material property data, you can import them into the HTRI software for your heat exchanger design and analysis. Please note that simulating the properties of mixtures requires specialized knowledge and experience, as predicting the behavior of mixtures can be very complex. If the results provided by the standard model differ significantly from the experimental data, you may need to use more advanced models for predicting physical properties or calibrate your mixture model using experimental data. When performing these operations, make sure you have the latest versions of PEFPROP and HTRI software, as well as that their respective property databases are up to date. If you do not have enough data to create a mixture model, it may be necessary to find or synthesize the corresponding property data. Furthermore, some professional communities or technical support services can provide additional assistance, especially when dealing with uncommon or new chemicals such as R-1234yf. .

Thank you for your professional response, which has helped me understand this issue better as well. There are still some issues, and I hope you can take another look at them. 1. PEFPROP does indeed have mixed refrigerants, but after importing the HTRI into the PEFPROP.dll file, the available media are only single-phase refrigerants; there are no mixed refrigerants. I’m not sure if there’s an issue with the way I performed the import 2. When using the media defined in PEFPROP directly in HTRI to mix substances such as R410A (a mixture of R125 and R32), the property calculations are incorrect, which prevents further calculations from being carried out. I’m not sure if there is any solution to this issue I hope you can help me take a look. If one of the above two issues can be resolved, then this problem will be solved as well. Thank you so much!