Patent ID: 11898571
Assignee: TRANE INTERNATIONAL INC.
Field: Thermal processes and apparatus (Mechanical engineering)
Classification: CPC F | IPC F

Claim 18:
19. The method of claim 17, wherein
the heating of the lubricant with the lubricant heater includes operating a second refrigeration circuit of the lubricant refrigeration system, the second refrigeration circuit being separate from the first refrigeration circuit and including a second auxiliary compressor, the lubricant heater, a second expander, an evaporator, and a third working fluid that includes a refrigerant, the third working fluid different from the second working fluid, and the operating of the second refrigeration circuit including:
compressing the third working fluid with the second auxiliary compressor,
directing the third working fluid compressed by the second auxiliary compressor to flow through the lubricant heater, and the lubricant absorbing heat from the third working fluid flowing through the lubricant heater,
expanding the working fluid with the second expander, and
heating the working fluid with the evaporator.