The aim of this paper is to achieve a smaller and cheaper heat exchanger with similar performance. To fulfill this demand, ANSYS-Fluent software and Aspen-HYSYS software are employed. The second goal is to study the effects of using oil-based nanofluids in a refinery heat exchanger. To fulfill this demand, two different nanofluids (MgO-SAE10 and ZnO-SAE10) are studied using two-phase approaches. And the third objective of this paper is to compare the results which are obtained from the singe- and multi-phase approaches. The governing equations have been solved according to the Eulerian–Eulerian single-fluid Two-Phase Model, with presumptuous that the coupling between phases is strong, and nanoparticles carefully follow the suspension flow. The FVM, SIMPLEC algorithm and k–ε turbulence model are applied. The thermal–hydraulic performance evaluation criteria, THPEC, and q″ have major roles. In the second step, the authors try to achieve an efficient model which not only has the THPEC > 1, but also has the maximum value of q″. According to the results, usage of nanofluid and turbulators can enhance thermal–hydraulic performances of heat exchanger significantly (between 84.78 and 105.31% for heat exchanger 1 and between 86.84% and 107.68% for heat exchanger 2). Furthermore, it is concluded that by employing nanofluid and turbulators the costs of manufacturing the refinery heat exchangers are sharply reduced.

本文的目的是要实现一种具有类似性能的更小，更便宜的热交换器。为了满足这一需求，采用了ANSYS-Fluent软件和Aspen-HYSYS软件。第二个目标是研究在炼油厂热交换器中使用油基纳米流体的效果。为了满足这一需求，使用两相方法研究了两种不同的纳米流体（MgO-SAE10和ZnO-SAE10）。本文的第三个目标是比较从单相和多相方法获得的结果。根据控制方程已经解决欧拉-欧拉单流体二-相模型假设相之间的耦合很强，并且纳米颗粒小心地跟随悬浮液流动。的FVM，SIMPLEC算法和ķ - ε紊流模型被施加。热工水力性能评估标准THPEC和q ”起主要作用。在第二步中，作者试图建立一个有效模型，该模型不仅具有THPEC> 1，而且具有q的最大值”。根据结果​​，使用纳米流体和湍流器可以显着提高热交换器的热工水力性能（热交换器1介于84.78和105.31％之间，热交换器2介于86.84％和107.68％之间）。此外，得出的结论是，通过使用纳米流体和湍流器，精炼热交换器的制造成本急剧降低。