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Measurement Techniques for Horizontal Flow Boling Heat Transfer With Pure and Mixed Refrigerants.


pdf icon Measurement Techniques for Horizontal Flow Boling Heat Transfer With Pure and Mixed Refrigerants. (6147 K)
Jung, D. S.; McLinden, M.; Radermacher, R.

Experimental Heat Transfer, Vol. 2, 237-255, 1989.

Sponsor:

Electric Power Research Institute, Palo Alto, CA

Keywords:

refrigerants; heat transfer; mixtures; stainless steels; pressure; wall temperature; pressure; wall temperature; experiments; power supply; composition (property); data analysis; verification; temperature measurements

Abstract:

A test rig and measurement techniques for horizontal flow boiling of pure and mixed refrigerants are described. Local heat transfer coefficients were measured for R22/R114 and R12/R152a mixtures as well as the corresponding pure components. The test section consists of an 8-m-Iong, 9.1-mm-i-d., electrically heated stainless steel tube and has the distinctive feature of variable heated length. Details of pressure, composition, and fluid and wall temperature measurements are discussed. The composition of sub-cooled liquid entering test section varied form test to test and it is recommended that it be measured for each test. For the R22/R114 mixture, local composition measurements in the annular liquid film revealed a composition variation of up to 0.07 mole fraction around the circumference of the heated tube.