Abstract:With increasing public demand for indoor environmental quality and the frequent occurrence of extreme high-temperature weather, air conditioning has become an essential means for elderly Chinese individuals to maintain a comfortable thermal environment. However, traditional air supply designs or improper placement of air conditioners can lead to uneven temperature distribution, characterized by "cooler near the unit and warmer farther away." To alleviate discomfort, the elderly often increase fan speed or lower the temperature, resulting in energy waste and health risks. To address this issue, this study proposes a dual-layer near-far circulating air supply method based on ultra-low Mach number counter-rotating fans and annular rotating jet technology. Tests in a controlled climate chamber and home scenario evaluations with 20 elderly participants demonstrated that this technology maintains a longitudinal temperature difference within 0.7°C in a 40 m2 room (0.1–1.7 m range), with a near-end (within 2.0 m) temperature difference below 1.0°C. The elderly felt cooler within 10 minutes and achieved thermal comfort in all areas after 60 minutes, with minimal draft sensation. This technology effectively improves indoor temperature uniformity and thermal comfort, providing technical support for future intelligent air conditioning systems designed for elderly care.