Refrigerant system including filtering apparatus and operating method thereof

An operating method of a refrigerant system, comprising:

• switching a refrigerant flow from a first flow path to a second flow path by controlling opening and closing of a first valve and a second valve;
• removing impurities by passing refrigerant through a refrigerant filter;
• calculating an amount of filtered impurities based on a refrigerant pressure before passing through the refrigerant filter and a refrigerant pressure after passing through the refrigerant filter;
• and
• replenishing refrigerant in an amount corresponding to the amount of the filtered impurities.

A refrigerant system, comprising:

• a first valve disposed on a first flow path configured to deliver refrigerant received from a condenser to an expansion valve;
• a second valve located between the first valve and the expansion valve;
• a control unit configured to control opening and closing of the first valve and the second valve;
• a second flow path having one end connected to the first valve and the other end connected to the second valve, and configured to deliver the refrigerant received from the first valve to the second valve;
• and
• a filtering apparatus disposed on the second flow path and configured to be controlled by the control unit to filter refrigerant flowing through the second flow path,
• wherein the control unit is further configured to determine an amount of replacement refrigerant based on a detected amount of filtered impurities.