Thermal analysis of a counterflow heat exchanger with a heat source
Thermal analysis of a counterflow heat exchanger with a heat source
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带热源的逆流换热器的热分析
DOI：
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发表时间：
2010
期刊：
影响因子：
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通讯作者：
V. W. Kotiaho
中科院分区：
文献类型：
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作者：
M. El Haj Assad;V. W. Kotiaho
摘要：本文提出了一种改进的分析逆流板式换热器，该换热器考虑了热源，假设热源在热流体中体积均匀。导出了换热单元数（NTU）和换热器效率的新表达式。在热源速率为零的情况下，对传统的效率- ntu关系进行了验证。这种热源为热流体的热交换器在氨-水吸收式热交换器的应用中是有意义的，其中吸收源热项出现在溶液侧。该模型基于热流体的最小热容和最大热容研究了两种情况。结果表明，在两种情况下，换热单元数和换热器的效率是不相同的。该分析应用于吸收式热交换器。对于热源为热流体的平行流换热器，给出了效率- ntu关系。
SYNOPSIS A modified analysis is presented of a counterflow plate heat exchanger that takes into account a heat source, which is assumed to be volumetrically uniform in the hot fluid. New expressions for the number of transfer units (NTU) and effectiveness of the heat exchanger are derived. These expressions are verified against the conventional effectiveness-NTU relationships in the limit of zero heat source rate. Such heat exchanger with heat source in the hot fluid is of interest in applications to ammonia-water absorption heat exchanger where a heat of absorption source term arises in the solution side. The model studies two cases based on the minimum and maximum heat capacities of the hot fluid. The results show that the number of heat transfer units and the effectiveness of the heat exchanger are not the same for both cases. The analysis is applied to an absorber heat exchanger. Effectiveness-NTU relationships are also given for a parallel flow heat exchanger with a heat source in the hot fluid.