Abstract User demand for increased internal thermal comfort conditions have resulted in rising energy costs for space-heating consumption. The present study aims to recover the thermal energy in ventilation exhaust air and transfer the energy to the incoming air, to be redistributed using natural ventilation windcatcher. A comprehensive review was carried out to explore heat recovery systems that can potentially be incorporated with natural ventilation wind catchers. A rotary heat recovery device suitable to be incorporated with a roof mounted multi directional windcatcher system was developed. Computational Fluid Dynamics (CFD) modelling and laboratory experimental tests were conducted to investigate the proposed system. In the first phase, a full-scale prototype of the passive rotary thermal wheel device was developed and tested in a crossflow channel to initially assess the concept and performance of the design. Two configurations of the passive heat recovery wheel were tested: 20 and 32 radial blades. The second phase focused on investigating the integration of heat recovery wheel into a windcatcher system. CFD modelling and scaled wind tunnel testing were conducted to assess the airflow and temperature distribution around the multi-directional windcatcher with a passive rotary wheel. The results showed that the addition of the heat recovery wheel rotating at 15 rpm reduced the indoor airflow speed between 14 and 30%, depending on the outdoor wind conditions. The system was able to provide the recommended fresh air rates when the outdoor wind speed was 1.5 m/s and higher. In addition to sufficient ventilation, the heat recovery system had a positive impact on the indoor air temperature, raising the temperature up to 3.7 °C depending on the indoor/outdoor conditions.

中文翻译：

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开发用于轻度寒冷气候的带有被动热回收轮的自然通风捕风器：CFD 和实验分析

摘要 用户对增加内部热舒适条件的需求导致空间供暖消耗的能源成本上升。本研究旨在回收通风排气中的热能并将能量转移到进入的空气中，然后使用自然通风捕风器进行重新分配。进行了全面审查，以探索可能与自然通风集风器结合使用的热回收系统。开发了一种适合与安装在屋顶上的多向捕风器系统结合的旋转热回收装置。进行了计算流体动力学 (CFD) 建模和实验室实验测试，以研究所提出的系统。在第一阶段，被动旋转热轮装置的全尺寸原型在横流通道中开发和测试，以初步评估设计的概念和性能。测试了被动热回收轮的两种配置：20 个和 32 个径向叶片。第二阶段的重点是研究将热回收轮集成到捕风器系统中。进行了 CFD 建模和缩放风洞测试，以评估带有被动旋转轮的多向捕风器周围的气流和温度分布。结果表明，根据室外风况，添加以 15 rpm 旋转的热回收轮可将室内气流速度降低 14% 至 30%。当室外风速为 1.5 m/s 或更高时，该系统能够提供推荐的新风量。