★★Introduction to a WeChat official account for property calculation and property lookup★★~~

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This post was last edited by royflyingfish on 2016-2-21 at 22:15. The WeChat official account for property calculation provides accurate property parameter data for industries such as chemicals, light industry, materials science, metallurgy, energy, machinery, and industrial fluids. The precision of these property calculations meets the requirements of engineering design, thereby offering significant convenience to engineers in their work. Everyone is welcome to scan the WeChat account to follow it~~ In terms of the methods used for property calculations, the high-precision data required for these calculations comes from the National Institute of Standards and Technology (NIST) in the United States. Various property parameters are calculated using specific mathematical methods, which ensures a high level of accuracy; the results obtained are almost identical to those provided by NIST, so users can use this tool with confidence. The Physical Properties Calculation WeChat account provides engineers working in the fields of chemical engineering, energy, machinery, and aviation with physical property parameters. The parameters that can be retrieved through this account include CAS numbers, molecular weights, critical compression coefficients, eccentricity factors, dipole moments, minimum temperatures, maximum temperatures, critical densities, triple-point temperatures, standard boiling points, critical temperatures, critical pressures, densities, internal energies, specific enthalpies, specific entropies, sound speeds, Prandtl numbers, compressibility factors, specific heat at constant volume, specific heat at constant pressure, Cp/Cv ratios, dynamic viscosities, kinematic viscosities, thermal conductivity, Joule-Thomson coefficients, and Prandtl numbers. Through calculations, the obtained properties of refrigerants, for example, represent effective solutions to challenges such as thermodynamic calculations and heat transfer calculations in the field of refrigeration and air conditioning. Introduction to NIST: The National Institute of Standards and Technology (NIST) is a agency under the U.S. Department of Commerce. It conducts fundamental and applied research in physics, biology, and engineering, as well as research on measurement technologies and testing methods. It provides standards, standard reference data, and related services, and enjoys a high reputation internationally. The main tasks of NIST are: (1) establishing **metrological benchmarks and standards ； ⑵Testing technologies developed for industrial and defense applications ； ⑶Development and sales of standard services ； ⑷Provide metrological verification and calibration services ； ⑸Participate in standard-setting by standardization technical committees ； ⑹Carry out technology transfer to help small and medium-sized enterprises develop new products ； In addition, it is also engaged in research on fire prevention, earthquake resistance technologies, and applied computing techniques. Introduction to NIST databases: NIST databases are a series of standard databases created by the NIST laboratories. By updating existing databases and developing new ones, NIST continuously expands its sets of evaluated numerical data, providing society with reliable and verified numerical data. Engineers and scientists from all sectors of society rely on NIST’s standard reference data to make decisions regarding many key technologies. NIST’s standard reference database series includes more than 50 databases, which can be classified into the following categories according to their subject area: analytical chemistry (including spectroscopy), atomic and molecular physics, biotechnology, chemistry and crystal structure, chemical kinetics, industrial fluids and chemical engineering, material properties, thermodynamics and thermochemistry, as well as other NIST databases. Property calculation consists of four modules: common substances, hydrocarbon substances, refrigerants, and mixture calculations. The Common Substances module includes a range of substances that are frequently used, such as air, water, oxygen, carbon monoxide, carbon dioxide, and other inorganic substances commonly utilized in engineering ； The hydrocarbon substances module primarily covers a range of substances such as alkanes, alkenes, aromatic hydrocarbons, and others; for example, methane, ethane, propane, various alkenes, benzene, and other organic compounds ； The refrigerant module includes over a hundred refrigerants commonly used in industry for cooling purposes, with quite comprehensive physical property data. Other features: 1. Unit conversion: In addition, the WeChat official account for property calculations also offers useful functions such as unit conversion. The conversions that can be performed include those of temperature, length, volume, mass, area, force, energy, power, time, density, speed, pressure, dynamic viscosity, and kinematic viscosity. It provides a great deal of convenience for converting between standards from different units. II. Flow rate conversion: The flow rate conversion function provides the conversion of gas volume and mass flow rate under different conditions. The calculation formula used is the Clapeyron equation of state for gases. This feature is very practical and widely used. III. Calculation of wet air density: The program can calculate the density of wet air, dry air, and water vapor based on the input values of ambient temperature, ambient pressure, and relative humidity. Comparison with NIST calculation data: 1. Comparison of air property parameters at different temperatures and pressures; 2. Comparison of methane property parameters at different temperatures and pressures