To attain a full-fledged design of a spiral piping system utilized in solar ponds, making a balance between thermal and frictional factors is a critical but difficult task. The present study proposes various designs of spiral piping system (SPS) characterized by the avant-garde arrangement of semi-O/O-shape grooves engraved on the wall of the pipe. In all of the proposed revolutionary grooving designs, the general number of annular grooves was kept at 20. These unorthodox configurations make unique thermal and frictional behavior and subsequently each of them bears distinct irreversibilities. The performance of the proposed configurations was examined based on the caused irreversibilities. Due to the geometrical structure of spiral pipe, the radius of the innermost turn is smaller than that of the outermost turn so selecting each of the ends as an inlet may lead to different results. In order to clarify the impact of inlet position on entropy generation, both inlet positions (the innermost and the outermost) were tested. This is a CFD-based study with experimental validation. The Finite Volume Method (FVM) was used as a discretization method to solve flow-thermal governing equations. The k-omega SST model was employed for modeling turbulence flow inside the GSPS. A high-resolution scheme and fourth order pressure-velocity coupling method were selected to calculate advection terms and the sequential calculation of the involved equations, respectively. To simulate the thermal condition of the lower convective zone (LCZ) of the salinity-gradient solar pond (SGSP) the outer wall of the spiral piping system was subjected to a constant temperature of 360 K. Flow velocity was varied from 0.1 m/s to 0.6 m/s to find its effect on the Nu∗,$N_E$, merit function (MF), heat transfer improvement index (HTI index),${\dot{S}}_{thermal}$, ${\dot{S}}_{frictional}$, and${\eta }_{W-S}$. Generally, HTI index,${\eta }_{W-S}$, and Nu∗ voted to the competency of the case ’’c’’. Entering flow from the innermost section preferred to the outermost section since it causes reasonable results in terms of HTI index,${\eta }_{W-S}$, and MF. Among grooved SPSs, cases ’’c’’ and ’’b’’ make the highest and the lowest ${\dot{S}}_{gen,Thermal}$, respectively, whereas this is totally inverse for${\dot{S}}_{gen,Frictional}$. The highest values of HTI index for flow velocities of 0.1 m/s and 6 m/s are 1.173 and 1.003 which are related to case ’’d’’ and case ’’c’’, respectively. Moreover, almost for all flow rates case ’’c’’ has the highest ${\eta }_{W-S}$ so that for 0.1 m/s and 6 m/s its values are 5% and 1.175%, respectively.

为了获得在太阳能水池中使用的螺旋管道系统的完整设计，在热因素和摩擦因素之间取得平衡是一项关键但艰巨的任务。本研究提出了各种设计的螺旋管道系统（SPS），其特征是刻在管道壁上的半O / O形凹槽的前卫布置。在所有拟议的革命性开槽设计中，环形槽的总数量保持在20个。这些非正统的构型具有独特的热和摩擦性能，随后每个都具有独特的不可逆性。根据引起的不可逆性检查了建议配置的性能。由于螺旋管的几何结构，最内圈的半径小于最外圈的半径，因此选择每个端部作为入口可能会导致不同的结果。为了阐明入口位置对熵产生的影响，测试了两个入口位置（最里面和最外面）。这是一项基于CFD的研究，并经过实验验证。有限体积法（FVM）作为离散化方法来求解流热控制方程。k-omega SST模型用于对GSPS内部的湍流进行建模。选择了高分辨率方案和四阶压力-速度耦合方法来分别计算对流项和相关方程的顺序计算。${ñ}_{Ë}$，优点函数（MF），传热改善指数（HTI指数），${\dot{\mathrm{小号}}}_{ŤHË\mathrm{[R}米\mathrm{一种}升}$， ${\dot{\mathrm{小号}}}_{F\mathrm{[R}\mathrm{一世}CŤ\mathrm{一世}Øñ\mathrm{一种}升}$， 和${\eta }_{\mathrm{w\; ^}-\mathrm{小号}}$。一般来说，HTI指数${\eta }_{\mathrm{w\; ^}-\mathrm{小号}}$，Nu ∗对“ c”案的权限投了赞成票。从首选的最里面部分到最外面的部分进入流，因为它会导致HTI指数方面的合理结果，${\eta }_{\mathrm{w\; ^}-\mathrm{小号}}$和MF。在带槽的SPS中，情况“ c”和“ b”为最高和最低${\dot{\mathrm{小号}}}_{GËñ，ŤHË\mathrm{[R}米\mathrm{一种}升}$，而这完全相反${\dot{\mathrm{小号}}}_{GËñ，F\mathrm{[R}\mathrm{一世}CŤ\mathrm{一世}Øñ\mathrm{一种}升}$。流速为0.1 m / s和6 m / s的HTI指数的最高值为1.173和1.003，分别与情况d和情况c有关。而且，几乎所有流量情况下，“ c”都具有最高的${\eta }_{\mathrm{w\; ^}-\mathrm{小号}}$ 因此，对于0.1 m / s和6 m / s，其值分别为5％和1.175％。