International Scientific Journal

Thermal Science - Online First

Authors of this Paper

External Links

online first only

A novel coupling discretization method for modeling multi-phase heat exchangers

This paper presents a novel coupling discretization method for modeling multi-phase heat exchangers. In the method, the MBM (Moving Boundary Method) is adopted as the solver to solve each of the FVCVs (Finite Volume Control Volume) divided by the method of FVM (Finite Volume Method). When all FVCVs are solved, the FVCV boundary values are updated based on the relationships of FVCVs. The solving procedure is initiated when the starting values of HSF (Hot Source Fluid) and CSF (Cold Source Fluid) outlet of the heat exchanger are given by the user and terminated when these values no longer change anymore. The experimental results of a plate heat exchanger with R245fa and Therminol 66 as CSF and HSF are adopted to validate the proposed model. Simulation results of 11 operating conditions show that the maximum deviation is within ±4% compared to the measured values. The model presented in this paper is appropriate for heat exchangers under operating conditions either with or without fluid phase change, such as the evaporator and condenser in the ORC (Organic Rankine Cycle) system.
PAPER REVISED: 2023-01-09
PAPER ACCEPTED: 2023-01-13
  1. Sprouse C., et al., Review of Organic Rankine Cycles for internal combustion engine exhaust waste heat recovery, Applied Thermal Engineering, 51 (2013), pp. 711-722
  2. Woolley E., et al., Industrial waste heat recovery: A systematic approach, Sustain. Energy Technol. Assessments, 29 (2018), pp. 50-59
  3. VDI-GVC, VDI Heat Atlas, Berlin, Heidelberg, 2010.
  4. Qiao H., et al., A new model for plate heat exchangers with generalized flow configurations and phase change, Int. J. Refrig, 36 (2013), pp. 622-632
  5. Patiño J., et al., A comparative analysis of a CO2 evaporator model using experimental heat transfer correlations and a flow pattern map, Int. J. Heat Mass Transf, 71 (2014), pp. 361-375
  6. Chowdhury J. I., et al., Modelling of evaporator in waste heat recovery system using finite volume method and fuzzy technique, Energies, 8 (2015), pp. 14078-14097
  7. Yohanis Y.G., et al., A simplified method of calculating heat flow through a two-phase heat exchanger, Appl. Therm. Eng, 25 (2005), pp. 2321-2329
  8. Zegenhagen M.T., et al., Simple models for the heat exchange from exhaust gas to super- and sub-critical refrigerant R134a at high temperature differences, Appl. Therm. Eng, 89 (2015), pp. 990-1000
  9. Gullapalli V.S., et al., Modeling of brazed plate heat exchangers for ORC systems, Energy Procedia, 129 (2017), pp. 443-450
  10. Bell I. H., et al., A generalized moving-boundary algorithm to predict the heat transfer rate of counterflow heat exchangers for any phase configuration, Appl. Therm. Eng, 79 (2015), pp. 192-201
  11. Lecompte S., et al., Experimental results of a small-scale organic Rankine cycle: Steady state identification and application to off-design model validation, Appl. Energy, 226 (2018), pp. 82-106
  12. Sarfraz O., et al., Discrete modeling of fin-and-tube heat exchangers with cross-fin conduction functionality, Int. J. Refrig, 104 (2019), pp. 270-281
  13. Taler D., et al., Mathematical modeling and control of plate fin and tube heat exchangers, Energy Convers. Manag, 96 (2015), pp. 452-462
  14. Huang R., et al., Comparison of approximation-assisted heat exchanger models for steady-state simulation of vapor compression system, Appl. Therm. Eng, 166 (2020), pp. 114691
  15. Bone V., et al., Methodology to develop off-design models of heat exchangers with non-ideal fluids, Appl. Therm. Eng, 145 (2018), pp. 716-734
  16. Jahn I. H. J., et al., Code for the Design and Evaluation of Heat Exchangers for Complex Fluids With Contributions from: Samuel Roubin, Report No. 04, The University of Queensland, Queensland, Australia, 2017
  17. Hagen B. A. L., et al., A novel methodology for Rankine cycle analysis with generic heat exchanger models, Appl. Therm. Eng, 165 (2020), pp. 114566
  18. Chu Z., et al., Moving-boundary and finite volume coupling algorithm for heat exchanger with fluid phase change, Int. J. Heat Mass Transf, 131 (2019), pp. 313-328
  19. Bell, I. H., et al., Pure and Pseudo-Pure Fluid Thermophysical Property Evaluation and the Open-Source Thermophysical Property Library Coolprop, Industrial and Engineering Chemistry Research, 53 (2014), pp. 2498-2508
  20. Brent R, Algorithms for Minimization Without Derivatives, Prentice-Hall, 1973
  21. Huang J., et al., Heat transfer and pressure drop in plate heat exchanger refrigerant evaporators, Int. J. Refrig, 35 (2012), pp. 325-335