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Characterizing the Discharge Quality for a Two-Phase Pumped Loop

Brand, Kevin Michael

Abstract Details

2018, Master of Science (M.S.), University of Dayton, Mechanical Engineering.
A two-phase pumped refrigerant (R-134a) loop was developed. An energy balance experiment was performed for the preheater, where calculated refrigerant volumetric flow rates differed by no more than 5% from measured flow rates. An energy balance was performed as well for the entire system, and calculated water volumetric flow rates differed by no more than 14% from measured flow rates. A model of the preheater and its power input was constructed and compared to experimental power inputs. The model time constant was 224 seconds and the experimental time constant was 194 seconds. Specified operating conditions were 5 kW heat input to the cold plate with a 96.6 psia discharge pressure. System operating boundaries for this setup were plotted as cold plate inlet subcooling and discharge quality both as functions of preheater input power and pump speed. Preheater power inputs ranged from 0 to 95% full-scale power (0 to 782 W) and pump speeds ranged from 60 to 100% full-scale speed (0.41 to 0.73 GPM). Within operating boundaries, vapor quality was kept at a value of 0.8 or lower. It is very useful to know the boundaries for the system, which could be used for future two-phase pumped loop systems.
Jamie Ervin, Ph.D. (Advisor)
Larry Byrd, Ph.D. (Committee Member)
Scott Stouffer, Ph.D. (Committee Member)
73 p.

Recommended Citations

Citations

  • Brand, K. M. (2018). Characterizing the Discharge Quality for a Two-Phase Pumped Loop [Master's thesis, University of Dayton]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1532718701597667

    APA Style (7th edition)

  • Brand, Kevin. Characterizing the Discharge Quality for a Two-Phase Pumped Loop. 2018. University of Dayton, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=dayton1532718701597667.

    MLA Style (8th edition)

  • Brand, Kevin. "Characterizing the Discharge Quality for a Two-Phase Pumped Loop." Master's thesis, University of Dayton, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1532718701597667

    Chicago Manual of Style (17th edition)