When engineers chase energy savings in a ventilation system, they usually think about the heat exchanger first and the fan second. That is backwards for part of the problem. A recovery core hands back the thermal energy in the exhaust, but the fan that pushes air through that core also consumes a large and often overlooked slice of the building’s electricity, and that slice grows sharply at part load. Pairing air-to-air recovery with electronically commutated (EC) fans attacks both losses at once: the core cuts the heating and cooling duty while the EC fan cuts the electricity needed to move the air. This article explains why the two belong together, how they behave at part load, and how to control them as one system.
Two savings at once
An AHU集成式回收芯 通常回收排气中60至80%的显热能量，缩减盘管负荷与设备规模。但换热芯在热力学上节省的每一立方米仍须由风机推送穿过芯体，而该风机运行于建筑整个寿命期。传统AC感应风机电机近乎定速运转，用风阀弃掉多余流量，以节流损失浪费能量；EC电机是电子控制的可变速驱动，只汲取风量真正需要的功率。两者相加，便在同一机组内同时削减供暖账单与风机电费。 空气－空气回收 设定了热学上限；EC风机设定了电气下限。
Part-load behaviour
建筑很少按设计负荷运行。在室人数、室外温度与工艺吞吐量在一天中波动，通风需求亦如此，而这恰恰是组合方案见效之处。EC风机随实际风量调节转速与功率，因此半负荷时耗电可远低于全负荷的一半，而定速AC风机几乎不改变其消耗。回收效率则因换热芯为被动装置而在宽流量范围保持高位，仅在极低面风速时略有下降，远不及风机所节省的。结果是，建筑用风越少时系统效率越改善——而那正是大多数时间。
Controls
节省只有在控制真正同时指令风机与旁路时才会实现。利用在室空间CO2传感器或工艺线VFD信号的需求控制通风设定目标风量，EC风机随之跟随。关键的是，回收换热芯需要协调的旁路：在可获得自由冷却的温和日子，控制应停止或旁路转轮，让EC风机直接抽入凉爽外气，而不是为无用的压降付费、强迫空气穿过闲置的芯体。顺序控制逻辑原则上简单——先经济器与需求控制，待空气确需处理时再回收——但必须明确写出，否则两系统会相互打架。一 选型指南 有助于厘清所选换热芯的压降相对于风机曲线处于何处。
| 方面 | AC感应风机 | EC风机 |
|---|---|---|
| 部分负荷功率 | 随流量几乎不下降 | 随流量缩放（近似立方律） |
| 转速控制 | 需外置VFD | 内置，精确 |
| 压降敏感性 | 与之对抗浪费能量 | 调节以维持设定点 |
| 典型年kWh | 较高 | 低20至50％ |
Specifying the package
When you buy recovery and fans separately you risk a mismatch: a great core on a fan that cannot exploit it, or an EC fan on a core with so much pressure drop the savings evaporate. Specify them as one package, sized so the EC fan’s operating point sits on its efficient region at design flow and the core’s pressure drop is within budget at that point. Include the bypass damper in the control sequence from day one, and commission the unit by measuring both the recovered energy and the fan wattage, not just confirming the wheel spins. For large air-handling units our AHU集成文章 涵盖换热芯与风机在机壳内的最佳布置位置。
Build a low-energy recovery unit with QIYU
QIYU提供为与EC风机组配对而选型的空气-空气回收芯，配备旁路与需求控制就绪接口，适用于AHU与补风场合。请将您的风量、压力预算与控制策略告知我们， 联系我们 以获取选型报价。可通过 WhatsApp +86 15753355505、美国电话 +1 915 295-3666，或邮箱 kuns913@gmail.com 联系杨经理。我们协助您选择合适的型号或设计定制回收方案。
常见问题
Why pair recovery with EC fans?
The core cuts heating and cooling duty while the EC fan cuts the electricity to push air through it; together they attack the thermal and the fan losses in the same unit.
How do EC fans behave at part load?
An EC motor draws only the power the airflow needs and sheds excess flow without damper throttling loss, so savings grow at part load where AC induction fans waste energy.
Are they controlled as one system?
Yes. The recovery core and EC fan should be sequenced so airflow tracks demand and the core modulates, avoiding the trap of recovering energy thermally while burning it electrically.
What should a spec capture?
Capture the core effectiveness, the EC fan curve and control interface, the part-load strategy and the combined measured saving, not just the peak thermal number.
相关产品
面向暖通空调与通风的板式、旋转式或热管回收。
空气与液体用大表面积固定芯体。
大风量用高效能量回收。
用于洁净场合的被动、完全分离气流。