The piping of HVAC application is often considered as a sound source. High flow velocities with pressure fluctuations, single or two phase flow patterns and other phenomena make it difficult to design a countermeasure for the generated noise. A Daikin HVAC unit often contains refrigerant mufflers in an attempt to reduce the generated refrigerant noise. Currently these mufflers are chosen based on experience.
Figure 1: A muffler in the piping of an HVAC system.
The goal of this thesis is to design a selection strategy in order to find the best suitable muffler for the application. An investigation is done to capture the common muffler designs existing in the market. A literature study evaluates the physical phenomena on which the mufflers of the pre-defined investigation rely. The effect of the muffler on the refrigerant flow can be investigated using CAE software. As a final step, the simulation model is verified with a test campaign.