Measurement of gas pulsation in the discharge line of a compressor for HVAC: Method to calculate the progressive acoustic wave from the compressor and reflected wave from the installation

摘要

The pulsation produced by a compressor and measured in the downstream pipeline is an important characteristic for system design. Unfortunately, this is also a difficult parameter to measure. In fact, the level is depending on the interaction with the system and the amount of energy due to reflection. Currently, they are 2 types of methods to achieve good measurements. One requires a large amount of hardware to create an anechoic termination. The measurement is done in the time domain recording peak-to-peak value. The other method is based on signal analysis in the frequency domain. This paper will propose a new numerical method for pulsation measurements of compressors using both the time and frequency domain. The frequency domain is used to separate the incident and reflected wave based on the complex representation of acoustic waves travelling in the pipe. The final target is to measure the progressive wave due to the compressor without the use of an extended length of the piping.