Horizontal Convective Boiling of Refrigerants and Refrigerant Mixtures Within a Micro-Fin Tube

Published

July 1, 2005

Author(s)

L J. Hamilton, Mark A. Kedzierski, M P. Kaul

Abstract

This paper presents local convective boiling measurements in a micro-fin tube for four pure refrigerants: R22, R32, R125, and R134a; and four refrigerant mixtures: R410B (R32/125, 45/55 % mass), R32/R134a (28/72 % and 30/70% mass) and, R407C (R32/125/134a, 25/23/52 % mass). Flow boiling heat transfer coefficients for the mixtures' pure components and R22 weremeasured to establish a baseline for the heat transfer degradation calculations. The measured convective boiling Nusselt numbers for all of the test refrigerants were correlated to a single expression consisting of a product of dimensionless properties. The correlation was shown to predict some existing data from the literature within 20%. The degradation in heat transfer performance of the mixtures was found to range from 1 - 50% for all refrigerants tested.

Citation

NIST Interagency/Internal Report (NISTIR) - 7243

Report Number

7243

NIST Pub Series

NIST Interagency/Internal Report (NISTIR)

Pub Type

NIST Pubs

Download Paper

https://doi.org/10.6028/NIST.IR.7243

Local Download

Keywords

boiling, enhanced heat transfer, fluid heating, micro-fin, refrigerant mixtures

Citation

Hamilton, L. , Kedzierski, M. and Kaul, M. (2005), Horizontal Convective Boiling of Refrigerants and Refrigerant Mixtures Within a Micro-Fin Tube, NIST Interagency/Internal Report (NISTIR), National Institute of Standards and Technology, Gaithersburg, MD, [online], https://doi.org/10.6028/NIST.IR.7243, https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=860975 (Accessed October 20, 2025)