Measurement Techniques for Horizontal Flow Boling Heat Transfer With Pure and Mixed Refrigerants.
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.
Building and Fire Research Laboratory
National Institute of Standards and Technology
Gaithersburg, MD 20899