环流盘管热回收系统

A run-around coil 热回收系统使用两个由封闭乙二醇回路连接的翅片盘管。水泵使流体在排风盘管（吸热）与送风盘管（向进入的空气释放热量）之间循环。

When to Use a Run-around Coil

当送风与排风管道相距较远或位于不同楼层时，这种设计最为理想。由于盘管彼此分离且仅由管道连接，其安装灵活性远高于板式或转轮式换热器。

System Components

• 排风空气盘管（翅片管）
• 送风空气盘管（翅片管）
• 循环泵
• 膨胀罐与乙二醇-水混合液
• 控制与温度传感器

Pros and Cons

优点：

• 无交叉污染风险
• 适用于长距离
• Easy to retrofit into existing ductwork
• Can recover heat from multiple exhaust points

Cons:

• Lower efficiency than counter-flow plate or rotary wheels (typically 40–60 %)
• Requires pump power and maintenance
• Glycol solution must be checked periodically

Common Applications

• Kitchen and laboratory exhaust
• Multi-zone commercial buildings
• Industrial processes with remote exhaust stacks
• Swimming pools and locker rooms

Controls and commissioning determine whether a run-around coil reaches its rated recovery. A variable-speed glycol pump trimmed to outdoor and exhaust temperatures lets the loop deliver more heat in winter and coast in mild weather, while a motorized bypass keeps supply temperature within setpoint. Integrate the pump and dampers with the building management system using dry contacts or a network link so the recovery runs only when the exhaust fan is on. During commissioning, balance flow to the design rate, confirm there are no air locks in the high points, and verify the expansion tank charge. Our 热回收解决方案 include factory-tested coil bundles and control packages for retrofit projects.

常见问题

What glycol concentration is typical?
A 30–50 % propylene glycol solution is common, depending on freeze protection requirements.

Can run-around coils recover humidity?
No. They are sensible-only systems and do not transfer moisture.

常见问题

Pros:nnNo risk of cross-contaminationnWorks over long distancesnEasy to retrofit into existing ductworknCan recover heat from multiple exhaust pointsnnCons:nnLower efficiency than counter-flow plate or rotary wheels (typically 40–60 %)nRequires pump power and maintenancenGlycol solution must be checked periodicallynnnCommon ApplicationsnnKitchen and laboratory exhaustnMulti-zone commercial buildingsnIndustrial processes with remote exhaust stacksnSwimming pools and locker roomsnnnControls and commissioning determine whether a run-around coil reaches its rated recovery. A variable-speed glycol pump trimmed to outdoor and exhaust temperatures lets the loop deliver more heat in winter and coast in mild weather, while a motorized bypass keeps supply temperature within setpoint. Integrate the pump and dampers with the building management system using dry contacts or a network link so the recovery runs only when the exhaust fan is on. During commissioning, balance flow to the design rate, confirm there are no air locks in the high points, and verify the expansion tank charge. Our heat recovery solutions include factory-tested coil bundles and control packages for retrofit projects.nFrequently Asked QuestionsnWhat glycol concentration is typical?

A 30–50 % propylene glycol solution is common, depending on freeze protection requirements.

Can run-around coils recover humidity?

No. They are sensible-only systems and do not transfer moisture.