US 11,808,499 B2
Method for replacing refrigerant in refrigeration apparatus, refrigerating machine oil, and container
Naoki Shimozono, Osaka (JP); Tomomi Yokoyama, Osaka (JP); Ryuuji Takeuchi, Osaka (JP); and Masaru Tanaka, Osaka (JP)
Assigned to Daikin Industries, Ltd., Osaka (JP)
Filed by DAIKIN INDUSTRIES, LTD., Osaka (JP)
Filed on Jul. 6, 2022, as Appl. No. 17/858,556.
Application 17/858,556 is a continuation of application No. PCT/JP2020/048887, filed on Dec. 25, 2020.
Claims priority of application No. 2020-015345 (JP), filed on Jan. 31, 2020; and application No. 2020-098476 (JP), filed on Jun. 5, 2020.
Prior Publication US 2022/0341640 A1, Oct. 27, 2022
Int. Cl. F25B 45/00 (2006.01); F25B 31/00 (2006.01)
CPC F25B 45/00 (2013.01) [F25B 31/002 (2013.01); F25B 2345/001 (2013.01); F25B 2345/002 (2013.01); F25B 2345/003 (2013.01); F25B 2500/16 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A refrigerant replacement method for a refrigeration apparatus, the method replacing a first refrigerant previously charged into a refrigerant circuit of the refrigeration apparatus with a second refrigerant, the first refrigerant being used together with a first refrigerating machine oil previously charged into the refrigerant circuit, the method comprising:
a refrigerant recovery step of recovering the first refrigerant from the refrigerant circuit;
an oil charging step of additionally charging a supplemental refrigerating machine oil having a predetermined additive content by percentage into the refrigerant circuit, the supplemental refrigerating machine oil blending with the first refrigerating machine oil to form a second refrigerating machine oil having a higher additive content by percentage than the first refrigerating machine oil; and
a refrigerant charging step of charging the second refrigerant into the refrigerant circuit,
the predetermined additive content by percentage of the supplemental refrigerating machine oil charged into the refrigerant circuit in the oil charging step being higher than the additive content by percentage of the second refrigerating machine oil to be used together with the second refrigerant.