TY - JOUR

T1 - Boiling of R134a in a Plate-Fin Heat Exchanger Having Offset Fins

AU - Ranganayakulu, Chennu

AU - Kabelac, Stephan

N1 - Publisher Copyright: Copyright © 2015 by ASME. Copyright: Copyright 2015 Elsevier B.V., All rights reserved.

PY - 2015/12

Y1 - 2015/12

N2 - This paper presents experimental results on boiling heat transfer of R134a in a compact plate fin heat exchanger. The exchanger is made of aluminum and has high density offset fins (30 fins/in.). Such heat exchangers are widely used in air separation industry and aerospace applications because of their high compactness and low weight. The test heat exchanger is attached to a vapor cycle refrigeration basic module to study the effects of boiling phenomena and its influence on performance as there is limited information available for this type of fins. This in turn allows for discussion on boiling mechanism of R134a inside the fins using the water circuit on the other side of the test heat exchanger. The water side single phase heat transfer coefficient (Colburn j factor) is calculated using the cfd tool fluent and validated with available open literature. The results are presented for heat fluxes up to 5500 W/m2 and mass fluxes up to 20 kg/(m2s) with water side flow rate varying from 0.033 to 0.17 kg/s for water temperatures of 10, 15, 20, 25, and 30 °C.

AB - This paper presents experimental results on boiling heat transfer of R134a in a compact plate fin heat exchanger. The exchanger is made of aluminum and has high density offset fins (30 fins/in.). Such heat exchangers are widely used in air separation industry and aerospace applications because of their high compactness and low weight. The test heat exchanger is attached to a vapor cycle refrigeration basic module to study the effects of boiling phenomena and its influence on performance as there is limited information available for this type of fins. This in turn allows for discussion on boiling mechanism of R134a inside the fins using the water circuit on the other side of the test heat exchanger. The water side single phase heat transfer coefficient (Colburn j factor) is calculated using the cfd tool fluent and validated with available open literature. The results are presented for heat fluxes up to 5500 W/m2 and mass fluxes up to 20 kg/(m2s) with water side flow rate varying from 0.033 to 0.17 kg/s for water temperatures of 10, 15, 20, 25, and 30 °C.

KW - boiling and refrigerant R134a

KW - heat transfer

KW - offset fins

KW - plate-fin heat exchangers

UR - http://www.scopus.com/inward/record.url?scp=84939243227&partnerID=8YFLogxK

U2 - 10.1115/1.4030910

DO - 10.1115/1.4030910

M3 - Article

AN - SCOPUS:84939243227

VL - 137

JO - Journal of Heat Transfer

JF - Journal of Heat Transfer

SN - 0022-1481

IS - 12

M1 - 121002

ER -