Abstract
The multi-blade centrifugal fan is commonly used in modern building ventilation and air-conditioning system. However, it does not readily satisfy the increasing demand for energy saving, high efficiency or noise reduction. Its performance is inherently limited by the geometrical structure of single circular arc blades. Q35-type multi-blade centrifugal fan studied as an example by combining the disturbance CST function to parameterize the blades. The optimization parameter change range is confirmed, and test samples are extracted before establishing an RBF proxy model. The NSGA-II algorithm is incorporated, and multi-objective optimization is performed with flow rate and total pressure efficiency as optimization goals. The results show that the fan performance is effectively improved. At the design working point, the air volume of the multi-blade centrifugal fan increases by 1.4 m3/min; at the same time, the total pressure efficiency increases by 3.1%, and the noise is reduced by 1.12 dB, applying the proposed design. The obtained higher fan efficiency can effectively improve performance of the whole ventilation and air-conditioning system. This novel optimization method also has relatively few parameters, which makes it potentially valuable for designing multi-wing centrifugal and other types of fans, providing a new idea for energy saving and emission reduction design of fan.
Highlights
With the rapid economic development, people have put forward new requirements for the ventilation and air-conditioning system
There is a large number of samples that need numerical simulation calculations, so it is very important to ensure the accuracy of numerical simulation calculations by test verification
The aerodynamic performance of the multi-blade centrifugal fans was tested on the experimental platform with reference to GB/T 1236-2017 [30], based on a performance test of an industrial ventilator with a standardized air duct
Summary
With the rapid economic development, people have put forward new requirements for the ventilation and air-conditioning system. The COVID-19 pandemic has further raised people’s attention on this [1,2]. Building electrical energy accounts for a large proportion of total energy consumption [3,4], and ventilation and air-conditioning systems are important energy-consuming sections, accounting for about 40% of building energy consumption [5]. Fan is an important component of ventilation and air-conditioning system. The improvement in fan performance can reduce electricity consumption by itself, which is considerable in some ventilation use and help increase the efficiency of refrigeration system to decrease even more electric energy cost. Research on developing ventilation equipment with high efficiency, energy-saving and low noise has grown increasingly important [6]
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