Tunnel Ventilation Heat Recovery

T隧道与地下空间输送着巨大的风量，通风风机是整个设施中最大的耗能设备之一。射流风机沿隧道推动空气，送排风机进行置换，在寒冷地区流入空气在进入前会被加热以免冻坏洞口或结构。这一供暖负荷整个冬季连续存在，并由排气带走的同种能源支付。在排气路径中设置空气-空气热回收芯可预热进风，挽回供暖成本中可观的一部分，但隧道还带来粉尘、压力预算、火灾模式和检修通道等独特约束，决定回收是否值得。本文涵盖其规模、板式芯方案，以及令隧道热回收成为专业活计的种种挑战。

The scale problem

公路或铁路隧道以几乎没有任何建筑能及的规模换气：每小时数十万立方米，昼夜不停。排气是稳定而温暖的排放，比冬季流入空气更暖，因此回收的温度差真实存在；但风量极其巨大，即便效率一般也能产生可观的绝对热回收量。难点在于地下空间相对温暖，岩石或土壤缓冲了温度，因此供暖需求低于同规模地上建筑，且在许多气候下投资回收弱于地上寒冷地工厂。回收最具吸引力的是流入空气真正寒冷之处——高山洞口、寒冷地区长隧道——或排气因车辆或设备负荷而持续温暖之处。一 热回收总体概览 有助于在投入资金前理清能量平衡。

Plate core in the exhaust

首选的回收装置是一台大型 逆流式板式换热芯 位于排气抽取路径中，在途中预热流入的新鲜进风。此处之所以优选逆流，是因为风量巨大、边际节能绝对量大，高效率至关重要。换热芯须按可用压力预算选型，隧道几乎让不出多少风机压头，且须置于可触及以便清洗之处，因为隧道排气含尘且带研磨性。由于两股气流被板片完全分隔，排气烟气不会混入送风，这对进风空气质量至关重要。一 防霜保护策略 在严寒时是必需的，一个再循环少量送风的旁路可使排气入口保持在冻结点以上。

方面	无热回收	板式回收
进风加热成本	全部燃气或电力负荷	按效率降低
风机压力预算	不变	因换热芯附加压降而降低
流道混合	不适用	无，板片分离
最佳气候	不适用	寒冷地区洞口

Challenges

Three issues separate a working tunnel installation from a failed one. First, dust and grit foul the core quickly, so the design needs wash-down access and a maintenance plan tied to the ventilation outages, which in a live tunnel are rare and expensive. Second, the pressure budget is tight; the core’s added drop must be small enough that the existing fans still meet the emergency ventilation rates, and that often means a lower face velocity and a bigger core than the thermal calculation alone would suggest. Third, fire and smoke mode is paramount: in an incident the recovery unit must get out of the way, a fire/smoke bypass routes the exhaust around the core so it never restricts the emergency airflow. Get any of these wrong and the recovery unit becomes a liability rather than a saving, so tunnel recovery is genuinely a specialist application that should be engineered, not bolted on.

Engineer tunnel recovery with QIYU

QIYU为严苛通风工况制造大型逆流式板式空气-空气换热芯，采用低阻力设计，配备防霜旁路与火/烟旁路选项。请将您的隧道风量、压力预算与气候告知我们， 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 is tunnel ventilation energy large?

Tunnels move hundreds of thousands of cubic metres per hour around the clock; the exhaust is a steady warm discharge warmer than incoming winter air, so even modest effectiveness yields large absolute recovery.

What recovery approach fits?

A plate core in the exhaust path preheats intake air, but the volumes are so large that the pressure budget and dust loading decide whether recovery is viable at all.

What makes tunnel recovery a specialist job?

Dust, pressure budget, fire mode and limited access for cleaning all constrain the core, and the rock or soil thermal buffer can lower the heating need versus an above-ground plant.

When is it worth it?

Recovery is most attractive in cold climates with long heating seasons and where the fan energy and intake-heating load are high enough to outweigh the access and maintenance difficulty.