地道风系统与换热新风装置的耦合应用研究
Research on coupling application of earth air tunnel heat exchanger system and ventilation unit with heat exchange
摘要：
提出了一种由地道风系统与换热新风装置组成的复合新风系统，通过数值模拟研究了风管直径、风管埋深、送风速度和土壤类型对系统热性能的影响。结果表明：冬季工况下复合新风系统作为独立热源时，对室外低温空气具有足够的加热能力，最大温升约30 ℃；该系统对室外空气温度波动具有平抑作用，随时间的延长更为明显，提高了室内热适应性。建议在北京市应用该复合新风系统时风管直径取150~250 mm，风管埋深取20 m，送风速度取3~5 m/s。
Abstract：
A composite outdoor air system consisting of earth air tunnel heat exchanger system and ventilation unit with heat exchange is proposed, and the influence of duct diameter, duct burial depth, supply air speed and soil type on the thermal performance of the system is studied by numerical simulation. The results show that when the composite outdoor air system is used as an independent heat source in winter, it has sufficient heating capacity for outdoor low-temperature air, and the maximum temperature rise is about 30 ℃. The system has a calming effect on outdoor air temperature fluctuations, and the extension over time is more obvious, improving indoor thermal adaptability. It is recommended that the diameter of the duct be 150 to 250 mm, the depth of the duct buried be 20 m, and the supply speed be 3 to 5 m/s when applying the composite outdoor air system in Beijing.
Keywords:earth air tunnel heat exchanger system; ventilation unit with heat exchange; composite outdoor air system; influencing factor; thermal performance; duct; numerical simulation; temperature field