Performance characterization of R134a and R245fa in a high aspect ratio microchannel condenser

Ebrahim Al-Hajri; Amir H. Shooshtari; Serguei Dessiatoun; Michael M. Ohadi

doi:10.1016/j.ijrefrig.2012.10.007

Performance characterization of R134a and R245fa in a high aspect ratio microchannel condenser

Ebrahim Al-Hajri, Amir H. Shooshtari, Serguei Dessiatoun, Michael M. Ohadi

Mechanical & Nuclear Engineering

University of Maryland

Research output: Contribution to journal › Article › peer-review

37 Scopus citations

Abstract

An experimental study on parametric characterization of two-phase condensing flows of refrigerants R134a and R245fa in a single microchannel was carried out utilizing a microchannel with a cross-section of 0.4 mm × 2.8 mm (7:1 aspect ratio) and length of 190 mm. The study investigated parametric effects of variations in saturation temperatures between 30 °C and 70 °C, mass flux between 50 and 500 kg m^-2s^-1, and inlet superheats between 0 °C and 20 °C on the average heat transfer coefficient and overall pressure drops in the microchannel. The results of the study suggest that while the saturation temperature and mass flux have a significant effect on both the heat transfer and overall pressure drop coefficients, the inlet superheat has little or no effect. In addition, the applicability of the Dobson-Chato correlation for heat transfer coefficient and Lockhart-Martinelli correlation for pressure drop for the range of parameters was investigated.

Original language	British English
Pages (from-to)	588-600
Number of pages	13
Journal	International Journal of Refrigeration
Volume	36
Issue number	2
DOIs	https://doi.org/10.1016/j.ijrefrig.2012.10.007
State	Published - 2013

Keywords

Condensation
Correlations
Experimentation
Heat transfer coefficient
Microchannels
Pressure drop

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10.1016/j.ijrefrig.2012.10.007

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title = "Performance characterization of R134a and R245fa in a high aspect ratio microchannel condenser",

abstract = "An experimental study on parametric characterization of two-phase condensing flows of refrigerants R134a and R245fa in a single microchannel was carried out utilizing a microchannel with a cross-section of 0.4 mm × 2.8 mm (7:1 aspect ratio) and length of 190 mm. The study investigated parametric effects of variations in saturation temperatures between 30 °C and 70 °C, mass flux between 50 and 500 kg m-2s-1, and inlet superheats between 0 °C and 20 °C on the average heat transfer coefficient and overall pressure drops in the microchannel. The results of the study suggest that while the saturation temperature and mass flux have a significant effect on both the heat transfer and overall pressure drop coefficients, the inlet superheat has little or no effect. In addition, the applicability of the Dobson-Chato correlation for heat transfer coefficient and Lockhart-Martinelli correlation for pressure drop for the range of parameters was investigated.",

keywords = "Condensation, Correlations, Experimentation, Heat transfer coefficient, Microchannels, Pressure drop",

author = "Ebrahim Al-Hajri and Shooshtari, {Amir H.} and Serguei Dessiatoun and Ohadi, {Michael M.}",

note = "Funding Information: The authors wish to acknowledge the financial support of this project by the American Society of Heating, Refrigerating, and Air Conditioning Engineers (ASHRAE) under ASHRAE-1270 TRP project, the Petrolium Instutute (Abu Dhabi, United Arab Emirates) and the Advanced Heat Exchangers consortium at the University of Maryland. Special thanks are due to ASHRAE technical committee TC 1.3 for sponsorship of this project. In this regard, the efforts of the project sub-monitoring task group, led by Dr. J. Heartfiled, are particularly acknowledged. ",

year = "2013",

doi = "10.1016/j.ijrefrig.2012.10.007",

language = "British English",

volume = "36",

pages = "588--600",

journal = "International Journal of Refrigeration",

issn = "0140-7007",

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AU - Al-Hajri, Ebrahim

AU - Shooshtari, Amir H.

AU - Dessiatoun, Serguei

AU - Ohadi, Michael M.

N1 - Funding Information: The authors wish to acknowledge the financial support of this project by the American Society of Heating, Refrigerating, and Air Conditioning Engineers (ASHRAE) under ASHRAE-1270 TRP project, the Petrolium Instutute (Abu Dhabi, United Arab Emirates) and the Advanced Heat Exchangers consortium at the University of Maryland. Special thanks are due to ASHRAE technical committee TC 1.3 for sponsorship of this project. In this regard, the efforts of the project sub-monitoring task group, led by Dr. J. Heartfiled, are particularly acknowledged.

PY - 2013

Y1 - 2013

N2 - An experimental study on parametric characterization of two-phase condensing flows of refrigerants R134a and R245fa in a single microchannel was carried out utilizing a microchannel with a cross-section of 0.4 mm × 2.8 mm (7:1 aspect ratio) and length of 190 mm. The study investigated parametric effects of variations in saturation temperatures between 30 °C and 70 °C, mass flux between 50 and 500 kg m-2s-1, and inlet superheats between 0 °C and 20 °C on the average heat transfer coefficient and overall pressure drops in the microchannel. The results of the study suggest that while the saturation temperature and mass flux have a significant effect on both the heat transfer and overall pressure drop coefficients, the inlet superheat has little or no effect. In addition, the applicability of the Dobson-Chato correlation for heat transfer coefficient and Lockhart-Martinelli correlation for pressure drop for the range of parameters was investigated.

AB - An experimental study on parametric characterization of two-phase condensing flows of refrigerants R134a and R245fa in a single microchannel was carried out utilizing a microchannel with a cross-section of 0.4 mm × 2.8 mm (7:1 aspect ratio) and length of 190 mm. The study investigated parametric effects of variations in saturation temperatures between 30 °C and 70 °C, mass flux between 50 and 500 kg m-2s-1, and inlet superheats between 0 °C and 20 °C on the average heat transfer coefficient and overall pressure drops in the microchannel. The results of the study suggest that while the saturation temperature and mass flux have a significant effect on both the heat transfer and overall pressure drop coefficients, the inlet superheat has little or no effect. In addition, the applicability of the Dobson-Chato correlation for heat transfer coefficient and Lockhart-Martinelli correlation for pressure drop for the range of parameters was investigated.

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KW - Correlations

KW - Experimentation

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KW - Microchannels

KW - Pressure drop

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Performance characterization of R134a and R245fa in a high aspect ratio microchannel condenser

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