Standard Rating Charts for Low GWP Refrigerants Flowing Through Adiabatic Helical Capillary Tube

[+] Author and Article Information
Badrish Pandey

Department of Mechanical Engineering, IIT Patna, Bihta Patna, Bihar 801106 India badrish.mtme16@iitp.ac.in

Desireddy Shashidhar Reddy

Department of Mechanical Engineering, IIT Patna, Bihta Patna, Bihar 801106 India desireddy.pme16@iitp.ac.in

Mohd. Kaleem Khan

03/208, Department of Mechanical Engineering, IIT Patna, Bihta Patna, Bihar 801106 India mkkhan@iitp.ac.in

Manabendra Pathak

Department of Mechanical Engineering Bihta, Patna-801103 Patna, 800013 India 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 xx xx, xxxx. Assoc. Editor: Amir Jokar.

ASME 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 GWP substitutes R-1234yf and R-32 respectively. A self-adjustable mass prediction algorithm has been developed using indigenous averaging technique. Based on this, a MATLAB code dynamically linked to REFPROP 9 software has been developed that solves governing equations of mass, momentum and energy. Two-phase flow inside capillary tube is assumed homogeneous and metastability is ignored in the proposed model. The proposed numerical models are in good agreement with 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 helical capillary tube. Coiling of capillary tube causes an increase in friction pressure drop and reduction in refrigerant mass flow rate. It has been found that mass flow rate reduces by about 5 % as coil diameter is reduced from 120 mm to 20 mm.

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