Lubrication and a method of retrofilling a working fluid/lubrica

Compositions – Vaporization – or expansion – refrigeration or heat or energy... – With lubricants – or warning – stabilizing or anti-corrosion...

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252 67, C09K 504

Patent

active

052290255

ABSTRACT:
The use of mixtures of 1,1,1,2-tetrafluoroethane and an ester having a molecular weight of greater than 250 as retrofill working fluid/lubricant combinations for mechanical vapor recompression heat transfer devices. Despite the presence of residual lubricant, e.g. hydrocarbon lubricants, from working fluid/lubricant combinations in which working fluids such as R12, R22, R502 or R511 are used, anticipated problems resulting from immiscibility such as excessive wear have not been observed.

REFERENCES:
patent: 2807155 (1957-09-01), Williamitis
patent: 4851144 (1989-07-01), McGraw et al.
patent: 5021179 (1991-06-01), Zehler et al.

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