TY - JOUR
T1 - Flow of refrigerant 134a through orifice tubes
AU - Singh, G. M.
AU - Hrnjak, P. S.
AU - Bullard, C. W.
N1 - Funding Information:
This work was supported by the National Science Foundation and the 24 member companies of Air Conditioning and Refrigeration Center, the University of Illinois at Urbana Champaign. Authors are grateful for assistance provided by: Dr. Alberto Hernandez Neto, Visiting Scholar from University of Sao Paolo, Brazil, Prof. Jianmin Yin, Visiting Scholar from Xi’an Jiaotong University, China, and research assistants Heather Esmond and Jennifer Green.
PY - 2002
Y1 - 2002
N2 - In this paper, experimental data and a model for predicting refrigerant flow through orifice tubes used as expansion devices in automotive and other air conditioning systems are presented. The results are analyzed for an extensive set (933 data points) of measurements of mass flow rate of 1,1,1,2,-tetrafluoroethane (CH2FCF3, better known as refrigerant R-134a) through orifice tubes of different diameters and lengths, with and without inlet and outlet screens, over a wide range of operating conditions, and in the range of inlet qualities from 0 to 1 and subcooling up to 40°C. The mass flow rate through orifice tubes was found to be a strong function of inlet pressure, inlet subcooling, and diameter, but a relatively weak function of length. The semi-empirical model is developed using the data set and is applicable over the complete range of operating conditions covering transients and very high vapor quality inlets that are common in automotive air conditioning applications.
AB - In this paper, experimental data and a model for predicting refrigerant flow through orifice tubes used as expansion devices in automotive and other air conditioning systems are presented. The results are analyzed for an extensive set (933 data points) of measurements of mass flow rate of 1,1,1,2,-tetrafluoroethane (CH2FCF3, better known as refrigerant R-134a) through orifice tubes of different diameters and lengths, with and without inlet and outlet screens, over a wide range of operating conditions, and in the range of inlet qualities from 0 to 1 and subcooling up to 40°C. The mass flow rate through orifice tubes was found to be a strong function of inlet pressure, inlet subcooling, and diameter, but a relatively weak function of length. The semi-empirical model is developed using the data set and is applicable over the complete range of operating conditions covering transients and very high vapor quality inlets that are common in automotive air conditioning applications.
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M3 - Conference article
AN - SCOPUS:0036269280
SN - 0001-2505
VL - 108 PART 1
SP - 145
JO - ASHRAE Transactions
JF - ASHRAE Transactions
T2 - 2002 ASHRAE Winter Meeting
Y2 - 13 January 2002 through 16 January 2002
ER -