Geometric parameters optimization of low resistance T-junction with guide vanes in HVAC system

Abstract

In recent years, with the increasing energy consumption and carbon emissions, people are paying more and more attention to related measures for energy conservation and emission reduction. As an important conveying component of the HVAC system, the pipe network system plays the function of distributing the fluid medium. However, a large part of the resistance loss is often generated during this transportation process, and the local pressure loss caused by local resistance components (e.g., T-junction) accounts for a large part of the total pressure drop. In this work, the influence of different guide vane positions on the resistance of the T-junction is analyzed. The internal flow field distribution and resistance characteristics of the T-junction are explored by numerical calculation method. The total energy dissipation and resistance reduction rate of the traditional T-junction and the novel T-junction with a guide vane are compared under different flow ratios. The resistance reduction rate of the optimized T-junction with a guide vane is 21.5%. The insertion of guide vanes can reduce the flow resistance and total energy loss of T-junction.

Experimental investigation of turbulent flow through a square-sectioned duct and 90ᵒ square elbow by using circular turbulator

“…The pressure drop data shown in the figure were taken at Re Dh = 1.6×10 4 , 4.8×10 4 , and 9.5×10 4 , or velocities of 2, 6, and 12 m/s. Meanwhile, the velocity profile in each cross-section and turbulence intensity are taken at Re Dh = 4.8×10 4 . For more details, this will be discussed in the following sections.…”

“…A variety of parts make up ducting construction, which supports channel function based on field requirements. These include valves [1], guide vanes [2,3], 90° elbows [4,5], and so on. These components also have different functions.…”

“…Energythe lowest ∆P CT /∆P 0 at α = 15° with Re Dh = 4.8×104 . According to experimental research, this section's ∆P CT /∆P 0 figure is 0.68.…”