The correlation functions used to calculate dimensional and physical parameters of each new fan have their origin in the classical theories of fluid mechanics, becoming known as the Fan Laws or Affinity Laws, while the noise predictions are based on acoustic principles and guidelines established by professional organizations. For better accuracy, the software can also perform calculations and analysis improved by considering Reynolds number, Mach number, compressibility, viscosity and specific heat of the fluid. Calculations and Analysis. • Required Flow Rate • Required Pressure • Inlet Pressure • The software adjusts the parameters in accordance with the fluid properties. • The software simulates the use of each type and size of fan.
• The software calculates diameter and width of the fan impeller. • The software calculates the operating rotational speed. • The software analyzes the performance and suggests the most suitable fans. • The software generates a selection list with sorting and filtering capabilities. • The software plots performance curves of the selected fan, such as the following: • Flow Rate × Static Pressure • Flow Rate × Total Pressure • Flow Rate × Power - Brake Horsepower • Flow Rate × Static Efficiency • Flow Rate × Total Efficiency • Flow Rate × Sound Pressure Level - Noise • Flow Rate × Sound Power Level - Noise Sound Spectrum. In addition to the aerodynamic requirements, the user can also set the fan installation conditions. Installation factors significantly influence the sound spectrum of the ventilation system and consequently the level of noise sensed in the environment.
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Coil Software Selection Program. CAPS provides a complete menu for Greenheck's fans and ventilators, centrifugal. Helpful wizards to guide your selection. Selection Guide for Fans The Selection Reference Guide aids in selecting the fan model(s). Ceiling and Sidewall Fans • Utility, Centrifugal and Radial Blowers.
• The user provides information about environmental characteristics and physical components of the ventilation system. • Noise Directivity • Inlet and Outlet Ducts • Acoustic Attenuators • Acoustic or Thermal Insulation • Noise Measurement Distance • The software adjusts the acoustic parameters of the fan in accordance with the operating point. • The software calculates the acoustic influence of each component of the ventilation system. • The software generates a noise calculation report for the operating point. • Fan sound spectrum in octave bands • Electric motor sound spectrum • Set sound spectrum: fan + electric motor • Lastly, the software calculates the noise for the full operating range of the fan and plots its curves.
• Flow Rate × Sound Pressure Level - Noise • Flow Rate × Sound Power Level - Noise Real Fluid. In ventilation systems, compressibility is the property of the moving fluid that reduces its volume as a function of the pressure increase resulting from the action of the fan. Compressibility increases the density of the fluid. The compression process generates heat which raises the outlet temperature of the fluid and consequently changes its viscosity. All these variables modify the behavior and efficiency of the fan.