Method for Charging Refrigerant into Heat Transferring Apparatus and Refrigerant-Charging Control Apparatus for Heat Transferring Apparatus

Abstract

A method for charging a refrigerant into a heat transferring apparatus ( 110 ) includes a pre-charging step (step 902 ) of charging an inert gas into a refrigerant flow path ( 10 ) of the heat transferring apparatus ( 110 ) to bring a pressure in the refrigerant flow path ( 10 ) of the heat transferring apparatus ( 110 ) to a predetermined pressure; and a main charging step (step 902 ) of charging the refrigerant into the refrigerant flow path ( 10 ) of the heat transferring apparatus ( 110 ) to a predetermined amount required for the heat transferring apparatus ( 110 ) to operate after the pre-charging step (step 904 ).

1 . A method for charging a refrigerant into a heat transferring apparatus, the method comprising:
 a pre-charging step of charging an inert gas into a refrigerant flow path of the heat transferring apparatus to bring a pressure in the refrigerant flow path of the heat transferring apparatus to a predetermined pressure; and   a main charging step of charging the refrigerant into the refrigerant flow path of the heat transferring apparatus to a predetermined amount required for the heat transferring apparatus to operate after the pre-charging step.   
     
     
         2 . The method for charging a refrigerant into a heat transferring apparatus according to  claim 1 , wherein the inert gas is charged to the predetermined pressure at which no cavitation occurs and no gas is produced in a pump arranged on the refrigerant flow path of the heat transferring apparatus during operation of the heat transferring apparatus in the pre-charging step. 
     
     
         3 . The method for charging a refrigerant into a heat transferring apparatus according to  claim 1 , wherein the inert gas is charged to bring the pressure in the refrigerant flow path of the heat transferring apparatus to the predetermined pressure so as to bring the pressure of the refrigerant to not smaller than a saturation vapor pressure of the refrigerant before the refrigerant flows into the pump arranged on the refrigerant flow path of the heat transferring apparatus during operation of the heat transferring apparatus in the pre-charging step. 
     
     
         4 . The method for charging a refrigerant into a heat transferring apparatus according to  claim 1 , wherein nitrogen as the inert gas is charged to bring the pressure in the refrigerant flow path of the heat transferring apparatus to the predetermined pressure in the pre-charging step. 
     
     
         5 . The method for charging a refrigerant into a heat transferring apparatus according to  claim 1 , wherein the refrigerant is charged into the refrigerant flow path of the heat transferring apparatus at a charging rate preventing that a solid of the refrigerant is produced to bring the pressure in the refrigerant flow path of the heat transferring apparatus to not smaller than a triple point pressure of the refrigerant after the inert gas is previously charged into the refrigerant flow path of the heat transferring apparatus to bring the pressure in the refrigerant flow path of the heat transferring apparatus to the predetermined pressure in the pre-charging step. 
     
     
         6 . A refrigerant-charging control apparatus for a heat transferring apparatus comprising
 a controller performing control to acquire a pressure in a refrigerant flow path of the heat transferring apparatus detected by a pressure detector, wherein   if conducting pre-charging to charge an inert gas into the refrigerant flow path of the heat transferring apparatus to bring a pressure in the refrigerant flow path of the heat transferring apparatus to a predetermined pressure before conducting main charging to charge a refrigerant into the refrigerant flow path of the heat transferring apparatus to a predetermined amount required for the heat transferring apparatus to operate, the controller performs control to determine whether the charging of the inert gas is completed based on the pressure in the refrigerant flow path of the heat transferring apparatus detected by the pressure detector.   
     
     
         7 . The refrigerant-charging control apparatus for a heat transferring apparatus according to  claim 6 , wherein the controller performs control to stop the charging of the inert gas if determining that the charging of the inert gas is completed. 
     
     
         8 . The refrigerant-charging control apparatus for a heat transferring apparatus according to  claim 6  further comprising a notifier providing notification of information about the charging of the refrigerant into the refrigerant flow path of the heat transferring apparatus, wherein
 the controller provides notification of information indicating that the charging of the inert gas is completed through the notifier if determining that the charging of the inert gas is completed. 
 
     
     
         9 . The refrigerant-charging control apparatus for a heat transferring apparatus according to  claim 8 , wherein the controller performs control to provide notification of the pressure acquired in the refrigerant flow path of the heat transferring apparatus as the information indicating that charging of the inert gas is completed through the notifier. 
     
     
         10 . The refrigerant-charging control apparatus for a heat transferring apparatus according to  claim 6 , wherein the controller performs control relating to the main charging to charge the refrigerant into the refrigerant flow path of the heat transferring apparatus to the predetermined amount required for the heat transferring apparatus to operate if determining that the pre-charging is completed based on the pressure in the refrigerant flow path of the heat transferring apparatus detected by the pressure detector.