1. Frederick Schwartz MS Graduate Student Room/Office: From: Fort Atkinson, WI Undergraduate: ME, UW-Platteville ‘08
Thesis: Development of Predictive Correlations for Thermal-Fluid Behavior of Mixed Refrigerants (ASHRAE Project 1602)

2. Experimental Significance
Mixed refrigerants have a thermodynamic advantage when compared to pure fluids for Joule-Thompson refrigeration cycles
Accurate prediction of thermal-fluid behavior is critical to design of cryogenic systems
No practical correlations currently exist for thermal-fluid behavior of mixed refrigerants at cryogenic temperatures for use in equipment design

3. Test Facility Design Tout Tin Twall Test Section gas mixture
ASHRAE Testing Requirements:
Six Refrigerant Concentrations
R14 (35% ), R23 (15% ), R32 (15% ), and R134a (35% )
Diluted with Argon (0%, 20%, 40%)
Methane (45%) , Ethane (35%) , and Propane (20%)
Diluted with Nitrogen (0%, 20%, 40%)
Mass flux: 250 kg/m2-s
Heat flux: 10 kW/m2
Temperatures: 150 K to room temperature
Pressures: 100kPa, 1000 kPa
Tube diameters: 0.5, 1.5, & 3.0 mm
Minimize convection and radiation heat transfer around test section
Twall
Tin
Tout
Test Section
gas
mixture

4. Research Objectives
Obtain thermal-fluid behavior data from the ASHRAE specified test conditions using the test facility developed for this project
Develop predictive, semi-empirical correlations for use in refrigeration equipment design