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- Some sites cannot mix supply and exhaust air at all: cleanrooms, hospitals, and hazardous or corrosive environments. Rotary wheels and plate exchangers move energy through a shared surface, so engineers turn to technologies that keep the streams fully isolated.
- A heat pipe is a sealed tube filled with a working fluid. Heat evaporates the fluid at the warm end and condenses it at the cool end, moving energy with no moving parts and no cross-contamination. Heat-pipe arrays sit in a single device spanning both airstreams, making them compact and maintenance-free.
- A run-around, or coupled coil, system uses two coils connected by a pumped fluid loop. One coil sits in the exhaust, the other in the supply; the fluid carries heat from one to the other. Because the only link is the external pipe loop, the airstreams are completely separate, and the coils can be far apart.
- Heat pipes: best for moderate temperature recovery in a compact footprint, no pumps, very reliable. Run-around coils: best when streams are distant, when liquids or gases other than air are involved, or when very high separation is required.
- Heat pipes are nearly passive; size them for the operating temperature band. Run-around loops need a pump and freeze protection in cold sites. Both avoid the leakage and contamination risks of wheels, which is why separated-stream recovery is common in mines, data centers, and pharmaceutical plants.
- As air-quality and contamination rules tighten, separated-stream recovery will keep growing. Heat pipes and run-around coils give engineers a clean way to recover energy without compromising isolation.
Some sites cannot mix supply and exhaust air at all: cleanrooms, hospitals, and hazardous or corrosive environments. Rotary wheels and plate exchangers move energy through a shared surface, so engineers turn to technologies that keep the streams fully isolated.
A heat pipe is a sealed tube filled with a working fluid. Heat evaporates the fluid at the warm end and condenses it at the cool end, moving energy with no moving parts and no cross-contamination. Heat-pipe arrays sit in a single device spanning both airstreams, making them compact and maintenance-free.
A run-around, or coupled coil, system uses two coils connected by a pumped fluid loop. One coil sits in the exhaust, the other in the supply; the fluid carries heat from one to the other. Because the only link is the external pipe loop, the airstreams are completely separate, and the coils can be far apart.
- Heat pipes: best for moderate temperature recovery in a compact footprint, no pumps, very reliable.
- Run-around coils: best when streams are distant, when liquids or gases other than air are involved, or when very high separation is required.
- Heat pipes are nearly passive; size them for the operating temperature band.
- Run-around loops need a pump and freeze protection in cold sites.
- Both avoid the leakage and contamination risks of wheels, which is why separated-stream recovery is common in mines, data centers, and pharmaceutical plants.
As air-quality and contamination rules tighten, separated-stream recovery will keep growing. Heat pipes and run-around coils give engineers a clean way to recover energy without compromising isolation.
