AN EXPERIMENTAL EVALUATION OF THE HEAT TRANSFER COEFFICIENTS OF R134A RELATIVE TO R12.

Summary

R12 WAS RUN WITH MINERAL OIL AS THE LUBRICANT. TO EVALUATE THE IMPACT OF THE LUBRICANT ON THE HEAT TRANSFER COEFFICIENTS, AN OIL SEPARATOR WAS ADDED. TESTS WERE THEN RUN WITH THE OIL SEPARATOR. THE REFRIGERATION LOOP WAS THEN CHARGED WITH REFRIGERANT R134A ALONG WITH A POLYALKYLENE GLYCOL. TEST RESULTS SHOW A NEAR CONSISTENT TREND OF IMPROVED HEAT TRANSFER WITH R134A AS COMPARED TO R12. THE PRESENCE OF OIL REDUCES THE CONDENSING HEAT TRANSFER WHILE SLIGHTLY IMPROVING THE EVAPORATION.

Details

Original title: AN EXPERIMENTAL EVALUATION OF THE HEAT TRANSFER COEFFICIENTS OF R134A RELATIVE TO R12.
Record ID : 1991-1045
Languages: English
Publication date: 1990/07/17
Source: Source: USNC-IIR/Proc. 1990 Refrig. Conf., Purdue Univ./ASHRAE, Purdue CFC Conf./Purdue Univ., Ray W. Herrick Lab., Sch. mech. Eng.
225-233; 8 fig.; 4 ref.
Document available for consultation in the library of the IIR headquarters only.

Indexing

Themes: CFCs;
HFCs;
Lubricants
Keywords: R134a; Heat transfer coefficient; Lubrication; Heat transfer; R12; Performance; Oil; Evaporation; Refrigerant; Condensation