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A Generalized Flow Model and Flow Charts for Predicting Mass Flow Rate through Short Tube Orifices  

Choi Jong Min (Department of Mechanical Engineering, Hanbat National University)
Kim Yongchan (Department of Mechanical Engineering, Korea University)
Kwak Jae Su (Aeropropulsion Department, KARI)
Kwon Byong Cheol (Department of Mechanical Engineering, Hanbat National University)
Publication Information
Korean Journal of Air-Conditioning and Refrigeration Engineering / v.16, no.10, 2004 , pp. 895-900 More about this Journal
Abstract
With the phaseout of CFC and HCFC refrigerants, refrigeration and heat pump systems must be redesigned to match and improve system performance with alternative refrigerants. A generalized flow model for predicting mass flow rate through short tube orifices is derived from a power law form of dimensionless parameters generated by Pi-theorem. The database for developing the correlation includes extensive experimental data for R12, R22, R134a, R407C, R410A, and R502 from the open literature. The correlation yields an average deviation of $0.3\%$ and a standard deviation of $6.1\%$ based on the present database. In addition, rating charts for predicting refrigerant flow rate through short tube orifices are generated for R12, R22, R134a, R407C, R410A, and R502.
Keywords
Short tube orifice; Generalized flow model; Flow chart; Mass flow rate; Heat pump;
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