Refrigerant charge assisting device, air-conditioning apparatus, and refrigerant charge assisting program

A refrigerant charge assisting device used when a refrigerant is charged into a refrigerant circuit of an air-conditioning apparatus including one or more heat source unit having a compressor and a heat source side heat exchanger, one or more use unit having a use side pressure reduction mechanism and a use side heat exchanger, and a relay unit having a subcooling heat exchanger, in which the heat source unit and the relay unit are connected with a liquid side refrigerant extension pipe and a gas side refrigerant extension pipe and the relay unit and the use unit are connected with a liquid side refrigerant extending branch pipe and a gas side refrigerant extending branch pipe, and in which the refrigerant circuit preforms a cooling and heating simultaneous operation, the refrigerant charge assisting device comprising:

• an input unit that is input with an initial refrigerant charge amount;
• an operation data acquisition unit that starts operation of the refrigerant circuit and acquires operation data of the refrigerant circuit after the initial refrigerant charge amount of refrigerant is charged in the refrigerant circuit;
• a charge amount computing unit that computes
• an internal volume of the liquid side refrigerant extension pipe or the liquid side refrigerant extending branch pipe from the initial refrigerant charge amount input to the input unit and the operation data acquired by the operation data acquisition unit,
• a target refrigerant charge amount from the computed internal volume and a standard operating state acquired in advance, the standard operating state being operation data of the refrigerant circuit when the refrigerant circuit is in a standard operating state that satisfies a preset condition, and
• an additional refrigerant charge amount on a basis of the target refrigerant charge amount and the initial refrigerant charge amount;
• and
• a display unit that displays the additional refrigerant charge amount computed by the charge amount computing unit.

A refrigerant charge assisting device used when a refrigerant is charged into a refrigerant circuit of an air-conditioning apparatus including one or more heat source unit having a compressor and a heat source side heat exchanger, one or more use unit having a use side pressure reduction mechanism and a use side heat exchanger, and a relay unit having a subcooling heat exchanger, in which the heat source unit and the relay unit are connected with a liquid side refrigerant extension pipe and a gas side refrigerant extension pipe and the relay unit and the use unit are connected with a liquid side refrigerant extending branch pipe and a gas side refrigerant extending branch pipe, and in which the refrigerant circuit is capable of preforming a cooling and heating simultaneous operation, the refrigerant charge assisting device comprising:

• an input unit that is input with a first initial refrigerant charge amount and a second initial refrigerant charge amount;
• an operation data acquisition unit that starts and acquires the first operation data of the refrigerant circuit after the first initial refrigerant charge amount of refrigerant is charged in the refrigerant circuit, and acquires the second operation data of the refrigerant circuit after the second initial refrigerant charge amount of refrigerant is charged in the refrigerant circuit;
• a charge amount computing unit that computes
• an internal volume of each of the liquid side refrigerant extension pipe and the liquid side refrigerant extending branch pipe from the first operation data, the second operation data, the first initial refrigerant charge amount, and the second initial refrigerant charge amount,
• a target refrigerant charge amount from both of the computed internal volumes and a standard operating state acquired in advance, the standard operating state being operation data of the refrigerant circuit when the refrigerant circuit is in a standard operating state that satisfies a preset condition, and
• an additional refrigerant charge amount on a basis of the target refrigerant charge amount, the first initial refrigerant charge amount, and the second initial refrigerant charge amount;
• and
• a display unit that displays the additional refrigerant charge amount computed by the charge amount computing unit.