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Research Papers

Standard Rating Charts for Low Global Warming Potential Refrigerants Flowing Through Adiabatic Helical Capillary Tube

[+] Author and Article Information
Badrish Pandey

Sustainable Energy Research Laboratory,
Department of Mechanical Engineering,
Indian Institute of Technology Patna,
Patna 801106, India
e-mail: badrish.mtme16@iitp.ac.in

Desireddy Shashidhar Reddy

Sustainable Energy Research Laboratory,
Department of Mechanical Engineering,
Indian Institute of Technology Patna,
Patna 801106, India
e-mail: desireddy.pme16@iitp.ac.in

Mohd. Kaleem Khan

Sustainable Energy Research Laboratory,
Department of Mechanical Engineering,
Indian Institute of Technology Patna,
Patna 801106, India
e-mail: mkkhan@iitp.ac.in

Manabendra Pathak

Sustainable Energy Research Laboratory,
Department of Mechanical Engineering,
Indian Institute of Technology Patna,
Patna 801106, India
e-mail: mpathak@iitp.ac.in

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the Journal of Thermal Science and Engineering Applications. Manuscript received December 31, 2018; final manuscript received March 25, 2019; published online May 3, 2019. Assoc. Editor: Amir Jokar.

J. Thermal Sci. Eng. Appl 11(5), 051015 (May 03, 2019) (9 pages) Paper No: TSEA-18-1695; doi: 10.1115/1.4043386 History: Received December 31, 2018; Accepted March 25, 2019

The present research work is undertaken to develop ASHRAE like standard rating charts for currently used refrigerants R-134a and R-410A and their potential low global warming potential (GWP) substitutes R-1234yf and R-32, respectively. A self-adjustable mass prediction algorithm has been developed using an averaging technique. Based on this, a matlab code dynamically linked to refprop v. 9.0 software has been developed that solves governing equations of mass, momentum, and energy. Two-phase flow inside the capillary tube is assumed homogeneous and metastability is ignored in the proposed model. The proposed numerical models are in good agreement with the available experimental data with overall percentage mean deviation is less than 6%. Coil diameter plays an important role in adjusting the mass flow rate in the helical capillary tube. Coiling of capillary tube causes an increase in friction pressure drop and a reduction in refrigerant mass flow rate. It has been found that the mass flow rate reduces by about 5% as coil diameter is reduced from 120 to 20 mm.

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References

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Figures

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Fig. 1

Schematic of the adiabatic helical capillary tube with infinitesimal control volume in the inset

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Fig. 2

Flowchart for computation of mass flow rate

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Fig. 3

Validation of the present model with ASHRAE’s rating charts: (a) reference capillary tube and (b) flow factor

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Fig. 4

Comparison of the present model with Zhou and Zhang [21] experimental data

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Fig. 5

Standard rating charts for R-134a: (a) reference capillary tube and (b) flow factor

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Fig. 6

Standard rating charts for R-1234yf: (a) reference capillary tube and (b) flow factor

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Fig. 7

Standard rating charts for R-410A: (a) reference capillary tube and (b) flow factor

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Fig. 8

Standard rating charts for R-32: (a) reference capillary tube and (b) flow factor

Tables

Errata

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