Plate heat exchangers are important tools used in heat transfer. Since they are characterized by a high heat transfer rate, high compactness, as well as easy maintenance, increasing their performance is a major and important objective for many researchers and related industrial manufacturers. Furthermore, it has a positive impact on fuel consumption and environmental protection. In this study, new geometry for the plates used in the plate heat exchanger is proposed in order to increase its performance. A numerical study of a single-phase counter-current flow model, with the new plate, is carried out using ANSYS Fluent software within the working conditions of the condensing combi boiler. The SST k-ω turbulence model is adopted to study the turbulent flow. The study concerns the thermal and hydrodynamic characteristics of the flow in the exchanger (e.g., Nusselt number Nu and coefficient of friction f) and determination of its performance based on the parameter Nu/f^1/3. The results of the numerical study are validated using a new analytical method. The values of Nu number, coefficient friction, and performance are compared with their corresponding values of new types of plate geometry and commercial chevron plates within the range of Reynolds number from 500 to 5000. The comparison shows an improvement in Nu number and overall performance of an average of 28% and 40%, respectively, compared to other commercial and new models.

板式换热器是用于传热的重要工具。由于它们具有高传热率，高致密性以及易于维护的特点，因此提高性能是许多研究人员和相关工业制造商的主要目标。此外，它对燃油消耗和环境保护具有积极影响。在这项研究中，提出了一种用于板式换热器的板的新几何形状，以提高其性能。在冷凝式组合锅炉的工作条件下，使用ANSYS Fluent软件对新板进行了单相逆流模型的数值研究。采用SSTk-ω湍流模型研究湍流。Nu和摩擦系数f）并根据参数Nu / f ^1/3确定其性能。数值研究的结果使用一种新的分析方法进行了验证。在500至5000的雷诺数范围内，将Nu值，系数摩擦系数和性能值与它们对应的新型板几何形状和商用人字形板的值进行比较。比较显示Nu值和整体性能有所提高与其他商用和新型号相比，平均分别为28％和40％。