Sizing and selection of heat exchanger at defined saving–investment ratio
Sizing and selection of heat exchanger at defined saving–investment ratio
复制标题
按规定的节约投资比确定热交换器的尺寸和选择
DOI：
10.1016/j.applthermaleng.2010.10.013
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发表时间：
2011
影响因子：
6.4
通讯作者：
Özden Ağra
中科院分区：
文献类型：
--
作者：
Özden Ağra
在本研究中，建立了一个新的模型，以确定在理想的节约投资比下，余热回收系统的热交换器的尺寸和最佳类型。储蓄投资率是效率、转移单位数和投资与储蓄潜力比这三个无维数的函数，而投资与储蓄潜力比是技术经济参数的函数。重新安排储蓄-投资率关系，将投资乘以储蓄潜能率和储蓄-投资率，得到一个新的无量纲数，即储蓄有效性，它是有效性与转移单元数的函数。这个无量纲数被绘制在文献中可用的有效性和转移单位数图表上。在期望的省投资比下，热交换器的尺寸可以根据得到的图表或表中给出的相关性来确定。当期望的节省-投资比给定时，可以计算节省效率，而不是效率和传输单元数值可以从图表中读取或计算所有类型的热交换器。然后，投资成本和节省也可以很容易地计算出来。通过比较相同节省投资比值下不同换热器类型的节省量来确定最佳换热器类型。此外，还使用两个案例对该模型进行了解释。
In this study, a new model was developed to determine the size and the best type of heat exchanger for waste-heat-recovery systems at desired saving–investment ratio. The savings–investment ratio is obtained as a function of the three dimensionless numbers: effectiveness, Number of Transfer Units and investment to saving potential ratio which is a function of technical and economical parameters. Rearranging the saving-investment ratio relation and multiplying investment to saving potential ratio and saving-investment ratio, a new dimensionless number which is called saving effectiveness was obtained as a function of effectiveness and Number of Transfer Units. This second dimensionless number was plotted on effectiveness and Number of Transfer Units charts which are available in the literature. Heat exchanger size at desired saving–investment ratio can be determined from the obtained charts or the correlation given as table. When desired saving-investment ratio is given saving effectiveness can be calculated than the effectiveness and Number of Transfer Units values can be read from the charts or calculated for all types of heat exchangers. Afterwards, investment cost and saving can also be calculated easily. The best heat exchanger type is determined by comparing savings of different heat exchanger types for the same saving-investment ratio value. In addition, the model is explained using two case studies.