Purpose

The purpose of this paper is to attain higher effectiveness with an introduction of Joule–Thomson effect on a three-fluid heat exchanger with two communications. It also gives a range of parameter values that have to be maintained for achieving effectiveness above 0.85. Attaining effectiveness above 0.85 is very important for the heat exchanger to perform the liquefaction of hot fluid.

Design/methodology/approach

The analysis is conducted using Galerkin’s method, a finite element approach.

Findings

This investigation determines crucial values for the cryogenic heat exchanger to achieve effectiveness above 0.85. The important findings are as follows: effectiveness above 0.85 is attained if the heat exchanger size is within the range of 8–10; ratio of heat flow resistance between intermediate and hot stream to heat flow resistance between cold and hot stream should be maintained between 1 and 10; the intermediate fluid temperature should be maintained between 0 and 0.2; the ratio of thermal capacity of the hot fluid relative to a cold fluid should be maintained between 1.25 and 1.42; and the ratio of thermal capacity of the hot fluid relative to an intermediate fluid should be maintained between 2 and 2.5.

Research limitations/implications

The investigation has presented a finding for improving the effectiveness of the cryogenic heat exchanger. Higher the Joule–Thomson pressure drop effect, more is the drop in temperature of the fluid resulting in additional cooling or lowering of the fluid temperature. The practical implementation is also explained, i.e. to achieve practically the Joule–Thomson pressure drop in a cryogenic heat exchanger.

Originality/value

To the best of the authors’ knowledge, no investigations were carried out previously on Joule–Thomson investigation on a three-fluid heat exchanger with two communications, for different values of Joule–Thomson pressure drop.

中文翻译：

---

通过正焦耳-汤姆逊压降效应对具有三个流体-二通信的低温换热器提高效率

目的

本文的目的是通过在具有两个通信的三流体热交换器上引入焦耳-汤姆逊效应来获得更高的效率。它还给出了一系列参数值，必须保持这些参数值才能达到 0.85 以上的有效性。达到0.85以上的效率对于换热器进行热流体的液化非常重要。

设计/方法/方法

使用有限元方法 Galerkin 方法进行分析。

发现

这项调查确定了低温换热器达到 0.85 以上效率的关键值。重要发现如下：如果换热器尺寸在 8-10 范围内，则效率高于 0.85；中间和热流之间的热流阻力与冷热流之间的热流阻力之比应保持在1和10之间；中间流体温度应保持在 0 和 0.2 之间；热流体与冷流体的热容量比应保持在 1.25 和 1.42 之间；并且热流体相对于中间流体的热容量比应保持在2和2.5之间。

研究限制/影响

该调查提出了提高低温热交换器效率的发现。焦耳-汤姆逊压降效应越高，流体温度下降越多，导致流体温度进一步冷却或降低。还解释了实际实施，即在低温热交换器中实际实现焦耳-汤姆逊压降。

原创性/价值

据作者所知，之前没有针对焦耳-汤姆逊压降的不同值对具有两个通信的三流体热交换器进行焦耳-汤姆逊调查的调查。