Purpose

Spiral-wound heat exchangers (SWHEs) are widely used in different industries. In special applications, such as cryogenic (HEs), fluid properties may significantly depend on fluid temperature. This paper aims to present an analytical method for design and rating of SWHEs considering variable fluid properties with consistent shell geometry and single-phase fluid.

Design/methodology/approach

To consider variations of fluid properties, the HE is divided into identical segments, and the fluid properties are assumed to be constant in each segment. Validation of the analytical method is accomplished by using three-dimensional numerical simulation with shear stress transport k-ω model, and the numerical model is verified by using the experimental data. Moreover, the HE cost is selected as the main criterion in obtaining the proper design, and the most affordable geometry is selected as the proper design.

Findings

The accuracy of different heat transfer and pressure drop correlations is investigated by comparing the analytical and numerical results. The average errors in the calculation of effectiveness, shell-side pressure drop and tube-side pressure drop using the analytical method are 2.1%, 13.9% and 13.3%, respectively. Moreover, the effect of five main geometrical parameters on the SWHE cost is investigated. The results indicate that the effect of longitudinal pitch ratio on the SWHE cost can be neglected, whereas other geometrical parameters have a significant impact on the total cost of the SWHE.

Originality/value

This work contains a versatile and low-cost analytical method to design and rating the SWHEs considering the variable fluid property with consistent shell geometry. The previous studies have introduced complex methods and have not considered the consistency of shell geometry.

中文翻译：

---

螺旋缠绕式换热器的一种分析方法：考虑温度相关流体特性的设计和成本估算

目的

螺旋缠绕式热交换器（SWHE）广泛用于不同行业。在诸如低温（HE）的特殊应用中，流体特性可能很大程度上取决于流体温度。本文旨在提出一种分析和设计SWHE的方法，该方法考虑了具有恒定壳体几何形状和单相流体的可变流体特性。

设计/方法/方法

为了考虑流体特性的变化，将HE划分为相同的段，并且假定每个段的流体特性都是恒定的。该分析方法的验证是通过使用带有剪应力传递k - ω模型的三维数值模拟来完成的，并使用实验数据对数值模型进行了验证。此外，选择HE成本作为获得适当设计的主要标准，并选择最经济的几何形状作为适当设计。

发现

通过比较分析结果和数值结果，研究了不同传热和压降相关性的准确性。使用分析方法计算有效性，壳侧压降和管侧压降的平均误差分别为2.1％，13.9％和13.3％。此外，研究了五个主要几何参数对SWHE成本的影响。结果表明，纵向螺距比对SWHE成本的影响可以忽略，而其他几何参数对SWHE的总成本有重大影响。

创意/价值

这项工作包含了一种通用且低成本的分析方法，以考虑到具有恒定壳体几何形状的可变流体特性，来设计和评估SWHE。先前的研究引入了复杂的方法，并且没有考虑壳几何的一致性。