Patent ID: 9644937
Date: 2017-05-09
CPC Classifications: F24F,G01B

Claim:
1. A piping length measuring system, comprising: a frequency characteristics measuring apparatus; a piping length calculating apparatus communicatively connected to the frequency characteristics measuring apparatus via a predetermined communication interface; and a filter, wherein the frequency characteristics measuring apparatus outputs a test signal at different frequencies from one end portion of refrigerant piping connecting an outdoor unit and an indoor unit of an air conditioner, measures frequency characteristics of the refrigerant piping by measuring at the end portion reflected signal levels at the different frequencies, and transmits the frequency characteristics measured to the piping length calculating apparatus, the filter, attached between a measuring site on the refrigerant piping measured by the frequency characteristics measuring apparatus and the outdoor unit or the indoor unit nearest to the measuring site, prevents a test signal from flowing into the outdoor unit or the indoor unit during the measuring, and the piping length calculating apparatus comprises a controller that extracts a lowest anti-resonant frequency from the frequency characteristics measured by the frequency characteristics measuring apparatus, and calculates a length of the refrigerant piping on the basis of the extracted lowest anti-resonant frequency.