Double Pipe Heat exchangers (DPHE) are widely used in high voltage and air conditioning, bioprocessing, refineries, etc. Various parameters such as twist ratio, the direction of twist, the geometry of cut in twisted tapes influence the effectiveness of the heat exchanger. This work focuses on the design of experiments based on Response Surface Methodology to determine the optimum values for maximizing the heat transfer and minimizing the friction factor in a DPHE inserted with varying cross-section cut twisted tapes. Input parameters considered were mass flow rate, the radius of cut, and angle of cut. The response variables are Heat transfer coefficient and friction factor. Input values required for the analysis were taken from CFD. The Influence of the above parameters on the response variables was analyzed using ANOVA. Both the linear as well as interaction terms influence the responses. Surface contours depict that the combination of the radius of cut and angle of cut show a significant effect on HTC and friction factor compared to the mass flow rate on the response variables. In the considered range, optimum conditions for attaining higher HTC and lesser friction factor are mass flow rate 0.05 Kg/s, radius of cut 5.464 mm, and angle of cut 45°.

双管式换热器（DPHE）广泛用于高压和空调，生物处理，精炼厂等。各种参数（例如，扭曲比，扭曲方向，扭曲带的切割几何形状）会影响热交换器的效率。这项工作着重于基于响应表面方法学的实验设计，以确定最佳的值，该最优值用于最大化在插入有不同横截面切割扭曲带的DPHE中的传热和最小化摩擦因数。考虑的输入参数是质量流率，切割半径和切割角度。响应变量是传热系数和摩擦系数。分析所需的输入值来自CFD。使用ANOVA分析以上参数对响应变量的影响。线性项和交互项都影响响应。表面轮廓表明，与质量流量对响应变量相比，切削半径和切削角度的组合对HTC和摩擦系数显示出显着影响。在所考虑的范围内，获得更高的HTC和更低的摩擦系数的最佳条件是质量流量0.05 Kg / s，切割半径5.464 mm和切割角度45°。