Energy-Efficient Ventilation Systems

The article discusses improving energy efficiency in ventilation systems through optimal selection and placement of elements downstream of the radial fan. To reduce costs and improve reliability, it emphasizes installing optimal designs with enhanced aerodynamic characteristics. Key elements include flexible inserts and diffusers, positioned immediately after the radial fan to manage uneven velocities, turbulence, and swirls. Recommendations are given for placing various components, such as flat symmetric, asymmetric, pyramidal, and step pyramidal diffusers, as well as flexible inserts and branches. The authors suggest changing the conventional arrangement of these elements, which are typically located immediately after the radial fan. Discharge flow equalization is recommended for radial fans in both suction and discharge modes, with backward and forward-curved blades, particularly effective in injection systems and fans with forward-curved blades. Equalization tools are especially effective in variable operation modes with frequency converters. Technical and economic comparisons show significant efficiency improvements. Using flow equalization tools compared to systems without them and with existing frequency converters yields a 9.8% economic benefit with a 0.2-year payback period. Combining flow equalization and frequency regulation provides a 12.5% economic benefit with a 1.8-year payback period.