Flow of refrigerant 134a through orifice tubes

G. M. Singh; P. S. Hrnjak; C. W. Bullard

Flow of refrigerant 134a through orifice tubes

G. M. Singh, P. S. Hrnjak, C. W. Bullard

Mechanical Science and Engineering

Research output: Contribution to journal › Conference article › peer-review

Abstract

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.

Original language	English (US)
Number of pages	1
Journal	ASHRAE Transactions
Volume	108 PART 1
State	Published - Jan 1 2002
Event	2002 ASHRAE Winter Meeting - Atlantic City, NJ, United States Duration: Jan 13 2002 → Jan 16 2002

ASJC Scopus subject areas

Building and Construction
Mechanical Engineering

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title = "Flow of refrigerant 134a through orifice tubes",

abstract = "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.",

author = "Singh, {G. M.} and Hrnjak, {P. S.} and Bullard, {C. W.}",

year = "2002",

month = jan,

day = "1",

language = "English (US)",

volume = "108 PART 1",

journal = "ASHRAE Transactions",

issn = "0001-2505",

publisher = "Amer. Soc. Heating, Ref. Air-Conditoning Eng. Inc.",

note = "2002 ASHRAE Winter Meeting ; Conference date: 13-01-2002 Through 16-01-2002",

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TY - JOUR

T1 - Flow of refrigerant 134a through orifice tubes

AU - Singh, G. M.

AU - Hrnjak, P. S.

AU - Bullard, C. W.

PY - 2002/1/1

Y1 - 2002/1/1

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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