Modeling the transient outlet pressure and mass flow during flashing of HCFC-22 in a small nonadiabatic vessel |
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Affiliation: | Mechanical Engineering Department, University of Arkansas Fayetteville, AR 72701, U.S.A.;Energy Systems Laboratory, Department of Mechanical Engineering Texas A & M University, College Station, TX 77843-3123, U.S.A. |
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Abstract: | A model was derived from basic thermodynamic principles to describe the rate of depressurization within a small vessel. Major assumptions for the model included negligible kinetic and potential energy terms, saturated conditions within the vessel, and equal phase velocities through the exiting orifice. The two-phase homogeneous equilibrium and homogeneous frozen models, along with the single-phase model were used to predict the mass flux. A verification of the model was provided against available experimental data. Model predictions showed that the orifice size, initial refrigerant amount, and wall heat transfer have a more significant impact on the depressurization process than initial pressure and vessel volume for the test conditions. |
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