Abstract
In trans-critical R744 refrigeration system, the flow of refrigerant through a short tube orifice is greatly different from that of a conventional refrigerant such as R134a. A specially designed short tube orifice was used to investigate the two-phase flow inside tube. Experimental results indicated that choked flow existed in all cases. The location of flashing inception within the tube would move to the exit as the upstream pressure increased. The relationships between the mass flow rate and the independent variables such as upstream pressure, upstream temperature, short-tube diameter and length were also examined. The R744 mass flow rate was strongly dependent on the diameter, and was proportional to the upstream pressure. A correlation that could be used to predict the mass flow rate was developed based on a large of experimental data. Approximately 95% of the measured data were within ±6% of the prediction. The maximum error between the measured data and the calculated results was within 16%.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
