Determining the best type of heat exchangers for heat recovery
Determining the best type of heat exchangers for heat recovery
复制标题
DOI：
10.1016/j.applthermaleng.2009.10.021
复制
发表时间：
2010-05
影响因子：
6.4
通讯作者：
I. Teke;Özden Ağra;Ş. Atayılmaz;H. Demir
中科院分区：
文献类型：
--
作者：
I. Teke;Özden Ağra;Ş. Atayılmaz;H. Demir
为热回收选择最合适的换热器配置是一个常见的问题。在本研究中，开发了一种新的模型，用于确定最适合的废热回收换热器的面积和类型，以获得最大的净收益。根据已知的技术和经济参数，如寿命、热交换器的单位面积成本、燃料的较低热值、热交换器的总传热系数、锅炉效率、每年运行时间、热交换器效率、热容量比、热交换器供应流体温度的年变化和现值因子，定义了一个无量纲E数。无量纲E数以图形形式表示为NTU的函数，并且热容量与相应的热交换器面积的比值可以很容易地从这些图中获得最大净增益。最佳的热交换器类型及其面积可以通过比较NTUmax热交换器的净收益或效率来确定。并通过一个算例给出了新方法的应用。
It is a common problem to choose the most appropriate heat exchanger configuration for heat recovery. In this study, a new model has been developed for determining the area and type of the most appropriate waste heat recovery heat exchanger for maximum net gain. A non-dimensional E number has been defined based on known technical and economic parameters such as the life-time, unit area cost of the heat exchanger, lower heating value of the fuel, overall heat transfer coefficient of heat exchanger, boiler efficiency, operation time per year, heat exchanger effectiveness, ratio of heat capacities, annual variation of the temperature of fluids supplied to the heat exchanger and present worth factor. The non-dimensional E numbers has been demonstrated in graphical forms as a function of NTU and ratio of heat capacities and corresponding heat exchanger area giving maximum net gain can easily be obtained from these graphs. The best heat exchanger type and its area can be determined comparing net gains or effectiveness of heat exchangers at NTUmax. Application of the new method has been given with a case study as a sample calculation.