期刊
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
卷 138, 期 -, 页码 1264-1280出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijheatmasstransfer.2019.04.100
关键词
Multi-port mini-channel heat exchanger; Flow distribution; Two-phase flow; Linearization; Numerical modeling
资金
- Korea Institute of Energy Technology Evaluation and Planning (KETEP) - Korean government (MOTIE) [20184010201660]
- National Research Foundation of Korea (NRF) - Korean government (Ministry of Science, ICT) [NRF-2017M2B2A9072724]
- National Research Foundation of Korea [2017M2B2A9072724] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
A refrigerant could boil and condense as it flows through heat exchangers such as evaporators and condensers. A multi-port mini-channel heat exchanger (MMHX) has a header that acts as a manifold. To analyze the performance of a multi-port mini-channel heat exchanger, it is necessary to predict the quality distribution of the two-phase flow in the header as well as the mass flow rate distribution to each channel. A numerical algorithm was developed to analyze the distribution of the two-phase flow to the channels of a MMHX. Conservation equations for each segment of the MMHX were linearized to construct a system of linear algebraic equations. Because all the distributed parameters of the MMHX were solved simultaneously, the two-phase flow and mass flow rate distributions were solved. The proposed method decreased the calculation time and increased the convergence of the solution. A computer program named M-Cube was written based on this numerical method and used to simulate several sets of experimental data. It was found that the evaluation of the heat transfer rate for an evaporator was either overestimated with a mean absolute error (MAE) of 4.81% or underestimated with an MAE of 22.18% depending on the phase distribution in the inlet header. Furthermore, this discrepancy increased as the quality increased. (C) 2019 Elsevier Ltd. All rights reserved.
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