TESTS CONFIRM HFC134A CAN REPLACE R12, R500 IN CENTRIFUGALS.

Author(s) : DUFFY G.

Type of article: Article

Summary

TESTS HAVE BEEN CONDUCTED USING R134A AS A DIRECT REPLACEMENT FOR R12 IN A CENTRIFUGAL COMPRESSOR, WATER-CHILLER SYSTEM, FITTED WITH A HIGHER SPEED IMPELLOR DRIVING GEAR TO PRODUCE THE HIGHER ISENTROPIC HEAD REQUIRED. UNDER STANDARD RATING CONDITIONS, CAPACITY AND EFFICIENCY INCREASED. DUE TO IMMISCIBILITY WITH MINERAL OIL HOWEVER, OIL RETURN FROM THE EVAPORATOR FAILED. TESTS WERE REPEATED USING AN ESTER-BASED OIL WHICH PROVED SATISFACTORY. SIMILAR TESTS USING R134A TO REPLACE R500 GAVE ABOUT 10% CAPACITY REDUCTION WHICH CAN BE OFFSET BY A CHANGE INGEAR RATIOS. AN ESTER-BASED LUBRICANT IS AGAIN REQUIRED. D.W.H.

Details

Original title: TESTS CONFIRM HFC134A CAN REPLACE R12, R500 IN CENTRIFUGALS.
Record ID : 1991-1480
Languages: English
Source: Air Cond. Heat. Refrig. News - vol. 181 - n. 5
Publication date: 1990
Document available for consultation in the library of the IIR headquarters only.

Links

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Indexing

Themes: CFCs;
HFCs;
Chillers;
Lubricants;
Blends
Keywords: R134a; Halogen; CFC; Lubrication; Chiller; R500; R12; Performance; Oil; Testing; Refrigerant; Centrifugal compressor