A new type of solar water heating system using an array of parabolic trough collectors (PTCs) was investigated. A coupled simulation technique was used to solve the complex radiation, convection, and conduction heat transfer problem inside the system. The realistic non-uniform heat flux at the walls of the receiver pipe was obtained by optical analysis and was used simultaneously in thermal modeling. A comprehensive model by considering thermal losses under the non-uniformity of heat flux was proposed and verified with experimental data. In the experiments, the water with different inlet temperatures and flow rates was tested. The obtained results demonstrate that the location of the receiver pipe relative to the PTCs significantly affects the system's thermal efficiency. For the system under study, the best position of the absorber pipe was found at the d/f ratio of 0.8. At the optimal position of absorber pipe, the average daily system's thermal efficiency is about 70%, and for an absorber pipe located at the focal line of the collectors, it is less than 60%. It can be concluded that the thermal efficiency of the current system is higher than that of conventional systems under the same conditions.

研究了一种使用一系列抛物槽收集器（PTC）的新型太阳能热水系统。耦合仿真技术用于解决系统内部复杂的辐射，对流和传导热传递问题。通过光学分析获得了接收器管壁处的实际不均匀热通量，并将其同时用于热模拟中。提出了一种考虑热流不均匀下的热损失的综合模型，并通过实验数据进行了验证。在实验中，测试了具有不同入口温度和流速的水。获得的结果表明，接收管相对于PTC的位置会显着影响系统的热效率。对于正在研究的系统，d / f比为0.8。在吸收管的最佳位置，每日平均系统的热效率约为70％，而位于集热器焦点处的吸收管的热效率低于60％。可以得出结论，在相同条件下，当前系统的热效率高于常规系统。