Daikin Industries, Ltd.

Tsuyoshi Yonemori

Takahiro Yamaguchi

Yoshinari Sasaki

Manabu Yoshimi

Youyou Xu

A leakage diagnosis apparatus for diagnosing presence/absence of refrigerant leakage in a refrigerant circuit performing a refrigeration cycle, wherein refrigerant leakage diagnosis using the amount of refrigerant exergy loss in a circuit component of the refrigerant circuit is realized. In a leakage diagnosis apparatus, an exergy calculation section calculates a leakage index value which changes in accordance with the amount of refrigerant leaking out of a refrigerant circuit based on the amount of refrigerant exergy loss in the circuit component. Then, a leakage determination section determines whether there is refrigerant leakage in the refrigerant circuit based on the leakage index value calculated by the exergy calculation section.

Leakage diagnosis apparatus, leakage diagnosis method, and refrigeration apparatus

A fluid sensor for detecting refrigerant leakage from a refrigerant circuit includes a sensor main body having two electrodes spaced apart from each other. The fluid sensor is configured such that the fluid sensor is connectable to an impedance measurement device to measure impedance between the two electrodes.

Fluid sensor, refrigerant leakage detection device, refrigeration system, and refrigerant leakage detection method

In a refrigeration system () that includes a refrigerant circuit () configured by connecting a plurality of circuit component parts including a compressor (), a pressure reduction device () and a plurality of heat exchangers () and operates in a refrigeration cycle by circulating refrigerant through the refrigerant circuit (), a refrigerant state detection section () is provided for detecting the refrigerant temperatures and entropies at the entrance and exit of each of the compressor (), the pressure reduction device () and the heat exchangers (), and a variation calculation section () is provided that uses the refrigerant temperatures and entropies detected by the refrigerant state detection section () to separately calculate the magnitude of energy variation of refrigerant produced in each of the circuit component parts.

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Osaka, Japan

Tsuyoshi Yonemori