Advances in Constructional Engineering

Driven by the "Dual Carbon" target, ultra-low energy buildings have become an important pathway to achieve energy conservation and emission reduction. As a key component of such buildings, the performance stability of the fresh air heat recovery system directly affects the overall energy efficiency. However, the performance degradation phenomenon in actual operation restricts the continuous realization of energy-saving effects. This paper focuses on the research of the performance degradation mechanism of the fresh air heat recovery system, and emphatically analyzes the influence mechanisms of material aging, dust accumulation and blockage, temperature and humidity fluctuations, and control strategy mismatch on the heat transfer efficiency of the system. Through the combination of theoretical analysis and simulation verification, the key influence paths of performance degradation are proposed, providing technical support for the optimal design and operation and maintenance management of the system.

Ultra-low energy buildings; Fresh air heat recovery; Performance degradation; Heat exchange efficiency; System aging