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

被引：39

作者：

Al-Hajri, Ebrahim ^{[1
]}

Shooshtari, Amir H. ^{[1
]}

Dessiatoun, Serguei ^{[1
]}

Ohadi, Michael M. ^{[1
]}

机构：

[1] Univ Maryland, Dept Mech Engn, College Pk, MD 20742 USA

来源：

INTERNATIONAL JOURNAL OF REFRIGERATION-REVUE INTERNATIONALE DU FROID | 2013年 / 36卷 / 02期

关键词：

Condensation; Microchannels; Heat transfer coefficient; Pressure drop; Experimentation; Correlations; HEAT-TRANSFER MODEL; SMALL-DIAMETER TUBES; FLOW PATTERN MAP; HORIZONTAL TUBES; PRESSURE-DROP; CIRCULAR MICROCHANNELS; SMOOTH TUBES; MICRO-FINS; TRANSFER COEFFICIENTS; REFRIGERANT R134A;

D O I：

10.1016/j.ijrefrig.2012.10.007

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

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 x 2.8 mm (7:1 aspect ratio) and length of 190 mm. The study investigated parametric effects of variations in saturation temperatures between 30 degrees C and 70 degrees C, mass flux between 50 and 500 kg m(-2) s(-1), and inlet superheats between 0 degrees C and 20 degrees 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. (C) 2012 Elsevier Ltd and IIR. All rights reserved.

引用

页码：588 / 600

页数：13

共 43 条

[1]

Akers W.W., 1959, Chemical Engineering Progress Symposium Series, V55, P171

[2]

AL-Hajri E.S., 2009, THESIS U MARYLAND CO

[3]

[Anonymous], 2009, 2009 ASHR HDB FUND

[4] Local condensation heat transfer rates in fine passages [J].

Baird, JR ;

Fletcher, DF ;

Haynes, BS .

INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER, 2003, 46 (23) :4453-4466

[5] Measurement and modeling of condensation heat transfer coefficients in circular microchannels [J].

Bandhauer, Todd M. ;

Agarwal, Akhil ;

Garimella, Srinivas .

JOURNAL OF HEAT TRANSFER-TRANSACTIONS OF THE ASME, 2006, 128 (10) :1050-1059

[6] Experimental investigation on condensation heat transfer and pressure drop of new HFC refrigerants (R134a, R125, R32, R410A, R236ea) in a horizontal smooth tube [J].

Cavallini, A ;

Censi, G ;

Del Col, D ;

Doretti, L ;

Longo, GA ;

Rossetto, L .

INTERNATIONAL JOURNAL OF REFRIGERATION-REVUE INTERNATIONALE DU FROID, 2001, 24 (01) :73-87

[7] Update on condensation heat transfer and pressure drop inside minichannels [J].

Cavallini, A ;

Doretti, L ;

Matkovic, M ;

Rossetto, L .

HEAT TRANSFER ENGINEERING, 2006, 27 (04) :74-87

[8] Condensation of halogenated refrigerants inside smooth tubes [J].

Cavallini, A ;

Censi, G ;

Del Col, D ;

Doretti, L ;

Longo, GA ;

Rossetto, L .

HVAC&R RESEARCH, 2002, 8 (04) :429-451

[9] Condensation in horizontal smooth tubes: A new heat transfer model for heat exchanger design [J].

Cavallini, Alberto ;

Del Col, Davide ;

Doretti, Luca ;

Matkovic, Marko ;

Rossetto, Luisa ;

Zilio, Claudio ;

Censi, Giuseppe .

HEAT TRANSFER ENGINEERING, 2006, 27 (08) :31-38

[10]

Coleman J.W., 2000, 34 NAT HEAT TRANSF C

← 1 2 3 4 5 →