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首页> 外文期刊>International journal of numerical methods for heat & fluid flow >Effect of ambient heat-in-leak on the performance of three-fluid cross-flow heat exchanger
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Effect of ambient heat-in-leak on the performance of three-fluid cross-flow heat exchanger

机译：环境渗漏热对三流体错流换热器性能的影响

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Purpose - Heat exchangers working in cryogenic temperature ranges are strongly affected by heat ingression from the ambient This paper aims to investigate the effect of ambient heat-in-leak on the performance of a three-fluid cross-flow cryogenic heat exchanger. Design/methodology/approach - The governing equations are derived for a three-fluid cross-flow cryogenic heat exchanger based on the conservation of energy principle. For given fluid inlet temperatures, the governing equations are solved using the finite element method to obtain exit temperatures of the three-fluid exchanger. The performance of the heat exchanger is determined using effectiveness-number of transfer units (e-NTU) method. In the present analysis, the amount of ambient heat-in-leak to the heat exchanger is accounted by two parameters H_t and H_b. The variation of the heat exchanger effectiveness due to ambient heat-in-leak is analyzed for various non-dimensional parameters defined to study the heat exchanger performance. Findings - The effect of ambient heat in leak to the heat exchanger from the surrounding is to increase the dimensionless exit mean temperature of all three fluids. An increase in heat in leak parameter (H_t = H_b) value from 0 to 0.1 reduces hot fluid effectiveness by 32 per cent for an NTU value of 10. Originality Value - The effect of heat-in-leak on a three-fluid cross-flow cryogenic heat exchanger is significant, but so far, no investigations are carried out. The results establish the efficacy of the method and throw light on important considerations involved in the design of such heat exchangers.
机译：目的-在低温温度范围内工作的热交换器受到周围环境热量的强烈影响。本文旨在研究环境渗漏热对三流体错流低温热交换器的性能的影响。设计/方法/方法-根据能量守恒原理，推导了三流体错流低温热交换器的控制方程。对于给定的流体入口温度，使用有限元方法求解控制方程以获得三流体交换器的出口温度。换热器的性能是使用转换单位有效数量（e-NTU）方法确定的。在当前的分析中，通过两个参数H_t和H_b解释了到热交换器的环境渗入热量。针对为研究热交换器性能而定义的各种无量纲参数，分析了由于环境泄漏引起的热交换器效率变化。调查结果-环境热量从周围环境泄漏到热交换器的影响是增加所有三种流体的无因次出口平均温度。当NTU值为10时，泄漏热参数（H_t = H_b）的值从0增加到0.1，会使热流体效率降低32％。原始值-泄漏热对三流体交叉口的影响流动低温热交换器具有重要意义，但到目前为止，尚未进行任何研究。结果证实了该方法的有效性，并为此类热交换器的设计所涉及的重要考虑提供了参考。

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