What is the air leakage rate of the rotating heat exchanger and how to calculate it?

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Air leakage rate of rotary heat exchanger
The air leakage rate of a rotary heat exchanger refers to the percentage of enthalpy loss in fresh air due to mixing of fresh air and exhaust air caused by loose sealing during the operation of the rotary heat exchanger.
1. Calculation method of air leakage rate
The air leakage rate of the rotary heat exchanger can be calculated by the following formula:
Air leakage rate = (1-ε)100%
in:
ε: heat transfer efficiency
2. Factors affecting air leakage rate
The air leakage rate of the rotary heat exchanger is affected by the following factors:
Clearance between the rotor and the seal
Seal material
Seal aging degree
Rotor speed
Filter clogging degree
Temperature difference
3. The harm of air leakage rate
The air leakage rate of the rotary heat exchanger will reduce the heat exchange efficiency, increase energy consumption and affect the indoor air quality.
4. Measures to reduce air leakage rate
Reduce the wheel speed
Regular inspection and maintenance of seals
Clean the filter
Reduce temperature difference
5. Typical air leakage rate
The air leakage rate of the rotary heat exchanger is generally between 5% and 15%, but it may be higher.

转轮漏风率的定义与计算

漏风率指新风与排风之间未经换热直接掺混的比例，通常以掺混风量占处理风量的百分比表示。影响漏风的主要因素是密封条磨损、轮毂间隙与转轮偏摆。采购时务必在合同中约定漏风率指标，详见规格型号与选型清单。

降低漏风的做法

采用双密封加隔断扇区、定期更换密封条、控制转轮动平衡，可有效将漏风率控制在较低水平。

验收检测

项目验收时可在新风与排风口布置风量仪，实测掺混量计算漏风率并写入质保条款，便于后期追溯与维护。

验收检测

项目验收时可在新风与排风口布置风量仪，实测掺混量计算漏风率并写入质保条款，便于后期追溯与维护，确保设备长期达标运行，不被虚标效率误导。

日常巡检记录可与能耗数据对照，及早发现效率衰减隐患；把漏风率纳入运维 KPI，有助于延长设备经济寿命。